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Delayed/Lazy Function Call
by John M. Dlugosz 02 Aug '11

02 Aug '11

Consider something like this: typedef std::tr1::function<void ()> CapsuleFunc; class worker_thread_queue; class forwarder { worker_thread_queue* queue; const NotifyFunc f; public: forwarder (worker_thread_queue* queue, const NotifyFunc f) : queue(queue), f(f) {} void operator() (uint32_t extended_ID, State_t newstate, State_t oldstate); }; class worker_thread_queue { // doesn't really work, just for illustration public: worker_thread_queue() { // really, would create a thread and thread-safe FIFO } // Calling submit will put f in a queue, and that queue is processed by the // worker thread. It removes each item in FIFO order and executes them. void submit (const CapsuleFunc& f) { /* but it's just an example */ } // Calling wrap will return another function that when executed will call submit(f) on this instance. NotifyFunc wrap (const NotifyFunc& f) { forwarder x (this, f); return x; } }; void forwarder::operator() (uint32_t extended_ID, State_t newstate, State_t oldstate) { CapsuleFunc x= std::tr1::bind (f, extended_ID, newstate, oldstate); queue->submit (x); } // later... worker_thread_queue work_queue; work_queue.wrap(&foo); Presuming a compiler that doesn't have Lambda functions supported, is there some nicer way to acheive the effect shown by 'wrap'? Given a function object f and a object q, I want to create a new function object that when invoked will bind its arguments and call q->submit with the bound-up form. I've seen forwarders throughout Boost; is there a publicly available one that I can use? Or some kind of "delayed apply" that can be called like bind, with the thing to be built up? I recall there is a full heavy duty library for lazy evaluation but don't recall its name. But I'm also wondering if there is a specific (lighter weight or already being used within the Boost libraries I'm already using) mechanism for this. —John

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access violation with asio
by Gianni Ambrosio 02 Aug '11

02 Aug '11

Hi All, can anybody explain me please why I get an access violation in the following code? And why if I enable the std::cout in the stream_handler destructor the code work fine without exception? I'm developing on windows XP, VS 2005. Regards Gianni Here is the code: #include <boost/asio.hpp> #include <boost/bind.hpp> #include <boost/thread.hpp> #include <boost/date_time/posix_time/posix_time_types.hpp> #include <iostream> typedef boost::shared_ptr<boost::asio::ip::tcp::socket> tcp_socket_ptr; class stream_handler { public: stream_handler() : acceptor(io_service) { boost::asio::ip::tcp::endpoint endpoint = boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(), 22222); acceptor.open(endpoint.protocol()); acceptor.set_option(boost::asio::ip::tcp::acceptor::reuse_address(true)); acceptor.bind(endpoint); acceptor.listen(); socket = tcp_socket_ptr(new boost::asio::ip::tcp::socket(io_service)); acceptor.async_accept(*socket, boost::bind(&stream_handler::handleAcceptForDebug, this, boost::asio::placeholders::error)); work = boost::shared_ptr<boost::asio::io_service::work>(new boost::asio::io_service::work(io_service)); thread = boost::thread(boost::bind(&boost::asio::io_service::run, &io_service)); } virtual ~stream_handler() { //std::cout << __FUNCTION__ << std::endl; io_service.stop(); } private: boost::asio::io_service io_service; boost::shared_ptr<boost::asio::io_service::work> work; boost::asio::ip::tcp::acceptor acceptor; boost::thread thread; tcp_socket_ptr socket; void handleAcceptForDebug(const boost::system::error_code& iError) {}; }; int main(int argc, char** argv) { stream_handler tcpsocket; return 0; }

2 3

Bizarre problem with range/adaptor/transformed.hpp
by John M. Dlugosz 02 Aug '11

02 Aug '11

I've traced a problem in my program to the inclusion of #include "boost/range/adaptor/transformed.hpp" Nothing is using the features in it (such things are removed from the test case build I'm using to get to the bottom of it). It compiles just as well with or without the line. But if the file is included, the program is broken. If I omit it, then the program works fine. Any suggestions would be welcome.

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boost.regex with ICU memory cleanup on windows
by Alex Perry 02 Aug '11

02 Aug '11

Hi, I recently asked this on stack overflow boost with icu u32_regex memory leak / cache on Win32<http://stackoverflow.com/questions/6867664/boost-with-icu-u32-regex-memory-…> but haven't been able to solve issue yet so thought I would ask here as well. The problem I'm having is that I can't seem to clean up the ICU data when it is loaded by boost regex using the optional icu linkage to support Unicode regex's. I'll copy the example source I posted above:- #define BOOST_TEST_MAIN //Ask boost unit test framework to create a main for us #define BOOST_ALL_DYN_LINK //Ask boost to link to dynamic library rather than purely header support where appropriate #include <boost/test/auto_unit_test.hpp> #include <boost/regex.hpp> #include <boost/regex/icu.hpp> //We use icu extensions to regex to support unicode searches on utf-8 #include <unicode/uclean.h> //We want to be able to clean up ICU cached objects BOOST_AUTO_TEST_CASE( standard_regex ) { boost::regex re( "\\d{3}"); } BOOST_AUTO_TEST_CASE( u32_regex ) { boost::u32regex re( boost::make_u32regex("\\d{3}")); u_cleanup(); //Ask the ICU library to clean up any cached memory } Which may be compiled at command prompt (cl version 16 from vs2010) with appropriate directories inserted if not pathed in on machine. cl test.cpp /I[BOOST HEADERS PATH] /I[ICU HEADERS] /EHsc /MDd -link /LIBPATH:[BOOST LIB PATH] [ICU LIB PATH]icuuc.lib The problem I have with this is that the u_cleanup() does not cleanup so the unit test framework reports memory leaks (at least that is what I think is going on) :- Just compiling the 1st test case will work perfectly - adding in the 2nd test case (with or without the u_cleanup() ) will generate a memory leak report Running 2 test cases... *** No errors detected Detected memory leaks! Dumping objects -> {778} normal block at 0x00668530, 28 bytes long. Data: < 0N W > 00 00 00 00 30 4E C2 57 00 00 00 00 01 00 00 00 {777} normal block at 0x004C5AF8, 14 bytes long. Data: <icudt46l-coll > 69 63 75 64 74 34 36 6C 2D 63 6F 6C 6C 00 {776} normal block at 0x004C5200, 5 bytes long. Data: <root > 72 6F 6F 74 00 {775} normal block at 0x004C9B30, 60 bytes long. Data: < RL ZL > 00 52 4C 00 F8 5A 4C 00 00 00 00 00 00 00 00 00 ... rest removed for clarity As it says in comment on original post icu appears to be loaded as a dynamic link so I can't see why u_cleanup() would not work - alternatively I can't find any calls in boost::regex library which would allow me to ask it to clean up icu cache. Thanks in advance for any help. Alex

2 1

program_options, parse up to first non-option
by Tow Mater 02 Aug '11

02 Aug '11

Can program_options be used to parse command line elements up to the first non-option that is not an option argument?

2 2

Boost::Tokenizer / "string iterators incompatible" error on Visual C++ 2010 Express - runs ok on gcc4.6.0
by asif saeed 02 Aug '11

02 Aug '11

Hi, The following piece of code is giving me "string iterators incompatible" error: ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// #include <iostream> #include <string> #include <boost/tokenizer.hpp> class Base { public: typedef boost::char_separator<char> sep_type_t; typedef boost::tokenizer<sep_type_t> tokenizer_t; Base(std::string s) : sep_(";"), tok_(s,sep_), i_(tok_.begin()) { } std::string nextToken() { if (i_!=tok_.end()) return *i_++; else return ""; } protected: sep_type_t sep_; tokenizer_t tok_; tokenizer_t::iterator i_; }; class Sub : public Base { public: Sub(std::string s) : Base(s) { std::string t = nextToken(); std::string u = nextToken(); std::string v = nextToken(); } void doSomething() { int x = 0; x +=1; } }; int main (int argc, char **argv) { Sub x("ASIF;Sohail;Kaleem;Maryam;Irfan;Khurram"); x.doSomething(); return 0; } ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// This code is compiling and running fine on GCC 4.6.0 / Fedora 15 / 64-bit. I hope somebody here will help me out on this. Best regards, Asif

3 4

Help with bind usage
by John M. Dlugosz 02 Aug '11

02 Aug '11

Suppose I have something that expects a general function object that takes three parameters. I have a function that takes one parameter, and I don't care about the other two. How do I get an instance func that when called as func(a,b,c) will end up calling my function foo as foo(a) and throw away the other two? If I use bind, I wind up with a functor that takes fewer arguments than the original. But here I have more.

2 1

Article on Boost.Asio in German computer magazine c't
by Boris Schaeling 01 Aug '11

01 Aug '11

I submitted today an article on Boost.Asio which will be published in the German computer magazine c't. I don't know yet in which edition but will tell on http://www.highscore.de/feed.atom. There may be more articles on Boost in c't in the future which I'll announce on my RSS feed then only (not to spam these lists). All of this hopefully helps to increase media coverage of Boost in the longterm. This again could help if for example BoostCon grows into something bigger. For now the article on Boost.Asio is a small step-stone. :) Boris

1 0

[range] range metafunctions and reference types
by Nathan Ridge 01 Aug '11

01 Aug '11

Hello, The range metafunctions currently do not work on range reference types. For example, the following: #include <vector> #include <boost/range/metafunctions.hpp> typedef boost::range_iterator<std::vector<int>&>::type iter_t; Fails with the errors: In file included from lib/boost/boost/range/iterator.hpp:23:0, from lib/boost/boost/range/metafunctions.hpp:18, from test4.cpp:2: lib/boost/boost/mpl/eval_if.hpp: In instantiation of 'boost::mpl::eval_if_c<false, boost::range_const_iterator<std::vector<int>&>, boost::range_mutable_iterator<std::vector<int>&> >': lib/boost/boost/range/iterator.hpp:72:63: instantiated from 'boost::range_iterator<std::vector<int>&>' test4.cpp:4:49: instantiated from here lib/boost/boost/mpl/eval_if.hpp:60:31: error: no type named 'type' in 'boost::mpl::eval_if_c<false, boost::range_const_iterator<std::vector<int>&>, boost::range_mutable_iterator<std::vector<int>&> >::f_ {aka struct boost::range_mutable_iterator<std::vector<int>&>}' This behaviour is OK when you are doing things like this: template <typename Range> typename range_iterator<Range>::type some_function(const Range& r) { ... } because when called with a "const vector<T>&" argument, template argument deduction will deduce "Range" to be just "vector<T>", and this is what we call the metafunction on. Likewise, if some_function has a non-const version that takes a "Range&" argument, it works fine too. But in C++0x, rvalue references allow us to kill two birds with one stone and have just one function that accepts both const and non-const references: template <typename Range> typename range_iterator<Range>::type some_function(Range&& r) { ... } However, the template argument deduction rules for rvalue references are different: if the function is called with a "const vector<T>&" parameter, "Range" will be deduced as "const vector<T>&", i.e. the reference is preserved. But now range_iterator gives an error as indicated above, so we have to do something awkward and verbose like this: template <typename Range> typename range_iterator<typename remove_reference<Range>::type>::type some_function(Range&& r) { ... } Could the range metafunctions be modified to accept range reference parameters and remove the reference themselves? Thanks, Nate.

2 3

[Serialization] Linker error on BOOST_CLASS_EXPORT upgrading from 1.44.0
by Enrico Carrara 01 Aug '11

01 Aug '11

Hello, I am facing a problem with serialization as implemented in Boost 1.47.0 which I did not experience in version 1.44.0. The problem appears as a series of linker errors (Visual C++ 8.0 (VS2005), WinXP 32bit): 1>Compiling... 1>Model_SerializationXml.cpp 1>Model_SerializationTxt.cpp 1>Compiling manifest to resources... 1>Linking... 1>Model_SerializationXml.obj : error LNK2005: "public: static struct boost::archive::detail::extra_detail::guid_initializer<class sm::CompLoad_Test> const & const boost::archive::detail::extra_detail::init_guid<class sm::CompLoad_Test>::g" (?g@?$init_guid@VCompLoad_Test@sm@@@extra_detail@detail@archive@boost @@2ABU?$guid_initializer@VCompLoad_Test@sm@@@2345@B) already defined in Model_SerializationTxt.obj [...many more similar errors] The scenario is as follows: I have a considerable bunch of classes which must be serialized by means of both text and XML archives. To this purpose, I have two compilation units, "Model_SerializationTxt.cpp" and "Model_SerializationXml.cpp", as follows: ///////////////////////////////////////////////// // Model_SerializationTxt.cpp [...] #include <boost/archive/text_iarchive.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/archive/archive_exception.hpp> [...] #include "SerClassExport.h" [...] ///////////////////////////////////////////////// ///////////////////////////////////////////////// // Model_SerializationXml.cpp [...] #include <boost/archive/xml_iarchive.hpp> #include <boost/archive/xml_oarchive.hpp> #include <boost/archive/archive_exception.hpp> [...] #include "SerClassExport.h" [...] ///////////////////////////////////////////////// ///////////////////////////////////////////////// // SerClassExport.h [...] // APPLICATION_DEPENDENT: Include here files // relevant to model classes to be exported // for serialization #include "Model_Root.h" #include "SM/SM_Node.h" [...Many more class definition headers] [...] #include <boost/serialization/export.hpp> // APPLICATION_DEPENDENT: Include here files // relevant to model classes to be exported // for serialization BOOST_CLASS_EXPORT(model::Root) BOOST_CLASS_EXPORT(sm::Node) [...Many more class export definitions] [...] ///////////////////////////////////////////////// The problem seems to be related to the fact that BOOST_CLASS_EXPORT is defined twice in my project. In Boost 1.44.0, struct guid_initializer was defined in "export.hpp" inside an anonymous namespace, while in Boost 1.47.0 - actually, since version 1.45.0 - the definition is inside namespace extra_detail, even if the comment above is unchanged: ///////////////////////////////////////////////// // export.hpp in Boost 1.44.0 [...] // Note INTENTIONAL usage of anonymous namespace in header. // This was made this way so that export.hpp could be included // in other headers. This is still under study. namespace { template<class T> struct guid_initializer [...] #define BOOST_CLASS_EXPORT_IMPLEMENT(T)\ namespace boost {\ namespace archive {\ namespace detail {\ namespace {\ template<>\ struct init_guid< T > {\ static guid_initializer< T > const & g;\ };\ guid_initializer< T > const & init_guid< T >::g =\ ::boost::serialization::singleton<\ guid_initializer< T >\ >::get_mutable_instance().export_guid();\ }}}}\ [...] ///////////////////////////////////////////////// ///////////////////////////////////////////////// // export.hpp in Boost 1.47.0 [...] // Note INTENTIONAL usage of anonymous namespace in header. // This was made this way so that export.hpp could be included // in other headers. This is still under study. namespace extra_detail { template<class T> struct guid_initializer [...] #define BOOST_CLASS_EXPORT_IMPLEMENT(T)\ namespace boost {\ namespace archive {\ namespace detail {\ namespace extra_detail {\ template<>\ struct init_guid< T > {\ static guid_initializer< T > const & g;\ };\ guid_initializer< T > const & init_guid< T >::g =\ ::boost::serialization::singleton<\ guid_initializer< T >\ >::get_mutable_instance().export_guid();\ }}}}\ [...] ///////////////////////////////////////////////// I guess that this might have a role in originating the linker problem. How can I avoid this error? I already tried including the list of BOOST_CLASS_EXPORT only once, i.e in Model_SerializationTxt.cpp only. This solved the linker problem, but serialization of data in XML was then impossible (runtime error). Unfortunately, merging the two compilation units in one is not possible, because the compiler (Visual C++ 8.0) goes out of memory while compiling the big unit (process memory grows beyond 2GB). Is there, in your opinion, a solution or a workaround to this situation? Let me apologize for the very long mail, I did not succeed in shortening it further. Looking forward to any possible advice, thank you in advance for your attention. Enrico

2 5

Boost::Tokenizer - "string iterators incompatible"
by asif saeed 01 Aug '11

01 Aug '11

Hi, The following piece of code is giving me "string iterators incompatible" error: ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// #include <iostream> #include <string> #include <boost/tokenizer.hpp> class Base { public: typedef boost::char_separator<char> sep_type_t; typedef boost::tokenizer<sep_type_t> tokenizer_t; Base(std::string s) : sep_(";"), tok_(s,sep_), i_(tok_.begin()) { } std::string nextToken() { if (i_!=tok_.end()) return *i_++; else return ""; } protected: sep_type_t sep_; tokenizer_t tok_; tokenizer_t::iterator i_; }; class Sub : public Base { public: Sub(std::string s) : Base(s) { std::string t = nextToken(); std::string u = nextToken(); std::string v = nextToken(); } void doSomething() { int x = 0; x +=1; } }; int main (int argc, char **argv) { Sub x("ASIF;Sohail;Kaleem;Maryam;Irfan;Khurram"); x.doSomething(); return 0; } ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// This code is compiling and running fine on GCC 4.6.0 / Fedora 15 / 64-bit. I hope somebody here will help me out on this. Best regards, Asif

1 0

[units] How to multiply a quantity with a dimensionless factor
by Marcel 01 Aug '11

01 Aug '11

Hi, I'm new to boost and units and hope this is not too trivial. If I try to multiply a quantity with a dimensionless factor like quantity<length> a; quantity<length> b = 2.0 * b; I get compiler errors due to missing operator*. So I worked around this by using quantity<length> b = quantity<dimensionless>(2.0) * b; But I'm wondering if there is a easier and better readable way to do this? Thank you in advance, Marcel

2 3

Execution problem moving libraries
by Alessandro Candini 01 Aug '11

01 Aug '11

Hi everyone. I get a very tricky error with boost.thread. I can compile and execute perfectly a C++ program with the following comand line: g++ -Wall -fPIC -pedantic -g -O3 -DDEBUG -march=native -std=c++0x -lboost_thread -o myExecutable myExecutable.cpp But I have to move this software into another machine, and I thought it was possible to take dynamic libraries with it, in order to properly link them to the executable. I have a structure like the following: package | bin |- myExecutable etc |- libboost_thread.a |- libboost_thread.so -> libbost_thread.so.1.42.0 `- libboost_thread.so.1.42.0 And performing a proper export of LD_LIBRARY_PATH, it seems I obtain a correct link: ldd myExecutable ... libboost_thread.so.1.42.0 => ../etc/libboost_thread.so.1.42.0 (0x002cd000) ... But when I try to execute my software, I obtain the following error: /home/user/myExecutable symbol lookup error: /home/user/myExecutable: undefined symbol: _ZTIN10__cxxabiv115__forced_unwindE Do you have an idea of why this occurs? Have I to compile boost libraries in an uncommon way to make this situation work? Thank you. -- Alessandro Candini MEEO S.r.l. Via Saragat 9 I-44122 Ferrara, Italy Tel: +39 0532 1861501 Fax: +39 0532 1861637 http://www.meeo.it ======================================== "ATTENZIONE:le informazioni contenute in questo messaggio sono da considerarsi confidenziali ed il loro utilizzo è riservato unicamente al destinatario sopra indicato. Chi dovesse ricevere questo messaggio per errore è tenuto ad informare il mittente ed a rimuoverlo definitivamente da ogni supporto elettronico o cartaceo." "WARNING:This message contains confidential and/or proprietary information which may be subject to privilege or immunity and which is intended for use of its addressee only. Should you receive this message in error, you are kindly requested to inform the sender and to definitively remove it from any paper or electronic format."

4 5

[interprocess] garbage chars when extending interprocess strings?
by Anthony Foiani 01 Aug '11

01 Aug '11

I'm having a peculiar problem with interprocess strings. 0. Create the shared string type. typedef boost::interprocess::managed_shared_memory ShmManagerType; typedef char ShmCharType; typedef boost::interprocess::allocator< ShmCharType, ShmManagerType::segment_manager > ShmCharAllocatorType; typedef boost::interprocess::basic_string< ShmCharType, std::char_traits< ShmCharType >, ShmCharAllocatorType > ShmStringType; 1. Initial write succeeds. ShmStringType val; val = "x"; cout << quoteString( x ) << endl; // prints "x" as expected 2. When I overwrite the value with a longer value, the longer value is stored and the length is updated -- but a null character (\0) is inserted at the *old* length. ShmStringType x3( "xxx" ); val = x3; cout << quoteString( val ) << endl; // prints "x\0x" !!! 3. When I write the longer value again, it is stored correctly and there is no \0 in the middle of the string. val = x3; cout << quoteString( val ) << endl; // prints "xxx" as expected 4. The same thing happens if we try a longer value again: ShmStringType x5( "xxxxx" ); val = x5; cout << quoteString( val ) << endl; // prints "xxx\0x" val = x5 cout << quoteString( val ) << endl; // prints "xxxxx" Does this ring bells for anyone? On my embedded platform, I'm using: powerpc e300c3 Linux 2.6.36 eglibc 2.13 boost 1_44_0 g++ 4.5.1 And on my development workstation: intel x86-64 Linux 2.6.35.13-92.fc14 glibc 2.13-1 boost 1.44.0-8.fc14 gcc 4.5.1-4.fc14 Testing this on my development workstation, I see similar issues (although it's not always \0; in this case, I'm getting \xC0 junk characters. Odd!) Test case at: http://foiani.com/cpp/boost/InterProcStringTest.cpp Sample output: http://foiani.com/cpp/boost/ipst-out-ppc32.txt http://foiani.com/cpp/boost/ipst-out-x86_64.txt The output isn't the same: some cases work on one platform but not the other, and the garbage character introduced isn't always \0. Any ideas would be welcome. Testing with a more current boost is a bit problematic; if someone believes that it's been fixed in the mean time, I'll do my best to try with a modern boost. In the mean time, I'll just write the values twice, I guess. :) Thanks for your time and attention! Best regards, Tony

3 8

[Iterator]Can dereference() in iterator_adaptor return a temporary value?
by Remi 01 Aug '11

01 Aug '11

Hi, I'd like a const iterator that acts as a proxy by giving access to elements of type A as if they were elements of unrelated type B. In that case I guess the dereference() member function should return a temporary value, right? Would that be a correct implementation of the idea? Here I just want to access an array of SourceVertexType as if it were an array of VertexType. template<class VertexType> class ConstVerticesIterator : public boost::iterator_adaptor< ConstVerticesIterator<VertexType>, const SourceVertexType*, const VertexType > { private: friend class boost::iterator_core_access; VertexType dereference() const { const SourceVertexType& source_vertex( *base() ); return VertexType( source_vertex.x, source_vertex.y ); } public: explicit ConstVerticesIterator( const SourceVertexType* vertices ) : boost::iterator_adaptor< ConstVerticesIterator<VertexType>, const SourceVertexType*, const VertexType >( vertices ) {} };

2 2

translate C-code into objects
by Peter Foelsche 01 Aug '11

01 Aug '11

Dear All, I would like to translate some C-Code into objects. I did this already for functions and expressions: Writing template functions and passing my expression object as an argument. Now I want to do this for C-Code, which uses if-statements and variables. To do this, I would implement some template function for an if-statement. And some function for an assignment to a variable. Probably using enumerations to indicate the variable. Is this the right approach? Peter

5 6

[foreach] Changes in Boost 1.47 beaking const rvalue detection for some compilers?
by Joaquin M Lopez Munoz 31 Jul '11

31 Jul '11

Hi, According to the discussion at http://lists.boost.org/boost-users/2011/07/69718.php seems like for some non-copyable sequence types, such as indices of Boost.MultiIndex, Boost.Foreach has stopped in GCC 4.6.1 with Boost 1.47 (and did not work in clang++ 2.9 either for Boost 1.46 or Boost 1.47.) Before I apply the boost::foreach::is_noncopyable hack, can the author take a look at this? Release notes for Boost 1.47 indicate that const rvalue detection has been modified in Boost.Foreach, so I wonder whether this situation is something that should be fixed in Boost.Foreach rather than user code. Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

2 1

[Serialization] Segmentation fault in split load
by Aditya Gadre 31 Jul '11

31 Jul '11

Hi, I am using Boost::Serialization to save and load a custom class using binary archive. I have split save and load functions as I need to do some initialization during loading process. However, I am getting a segmentation fault while loading and I am not very sure of the reason. The segmentation fault occurs while loading a boolean. I would appreciate any help in this regard. I have attached a full back trace and also the header file for the custom class. Thanks, - Aditya

2 2

[units] quantity to/from string / setting value component apart from the units
by Michael Powell 31 Jul '11

31 Jul '11

Units developers/user, Preferably, I would like to get after a quantity's value and/or its units in string format, plumb that through to the .NET Managed environment. The managed plumbing is straightforward enough to research, no problem. Can I use boost::units::to_string(q), where q is declared something like quantity<si::length,float>? And then, what can we expect after calling it? For instance, if q is set to 2.5 * meters, then can we expect "2.5 m"? Also, can I set a quantity value apart from its unit? In other words, if I've got a quantity<si::length,float> q again, I'd like to do something like this: q.value(2.5); or: q = 2.5; Or some way that preserves the current quantity units. Thank you... Regards, Michael

1 0

DateTime from String
by Kraus Philipp 31 Jul '11

31 Jul '11

Hello, I read a string with a date / time format, like: Fri, 29 Jul 2011 13:48:57 +0000 Can I use Boost.DateTime to convert the string into a std::time_t value? How can I do this? Thanks Phil

3 2

asio problem with detecting http header end
by Kraus Philipp 31 Jul '11

31 Jul '11

Hello, I use Boost.ASIO for receiving Twitter JSON data. I use this code: boost::asio::write( p_socket, l_request ); boost::asio::streambuf l_response; boost::asio::read_until(p_socket, l_response, "\r\n\r\n"); So in my optional the l_response variable should be read the full HTTP header. But if I write it to the std::cout I get: HTTP/1.1 200 OK Date: Fri, 29 Jul 2011 20:08:37 GMT Server: hi Cache-Control: max-age=15, must-revalidate, max-age=300 Expires: Fri, 29 Jul 2011 20:13:37 GMT Content-Type: application/json;charset=utf-8 Content-Length: 9763 Vary: Accept-Encoding X-Varnish: 1045274856 Age: 0 Via: 1.1 varnish X-Cache-Svr: smf1-aba-35-sr2.prod.twitter.com X-Cache: MISS Connection: close {"completed_in":0.025,"max_id":97033383951081472,"max_id_str":"97033383951081472","next_page":"?page=2&max_id=9703338395108147 I can change the "until read parameter" to \n, Connection: close or something else, but the read_until method does not stop the reading at the correct chars. Same code on a Wikipedia call runs without problems. Can anyone help me please to receive the correct header? Thanks Phil

4 3

i earned 297.11 today on the internet...
by Lars Schouw 31 Jul '11

31 Jul '11

Hey you...if u would you like to take in 297.11 from your computer try this #bizope# it's very easy

1 0

[units] build up a runtime
by Michael Powell 31 Jul '11

31 Jul '11

Units developers/users, I need some advice. I am fairly confident boost::units is the way for us to go and support a design- or compile-time unit safe calculations environment. However, now for the tricky business of exposing that functionality to the rest of our application. I am in the midst of trying to do this by exposing some Managed C++ classes, plausibly representing each kind of dimension; to get started with I implemented a base Quantity class, and I am extending that to a Length. I would like to include a quantity<si::length> member, for starters, but I am receiving a build error: Error 2 error C4368: cannot define 'si_l' as a member of managed 'CS::Boost::Units::Dimensions::Length': mixed types are not supported c:\source\safetyvalve2011\cs.calculations.managed\units\Length.h 41 CS.Calculations.Managed This might extend to include a quantity<us::length>, for instance; and so on for other unit systems. Whatever .NET class we expose, this will act like the proxy between the application layer and the calculations layer; we might have Dimension-aware UI controls that work on Length, or Quantity, for instance. That sort of thing. Anyone encountered anything like this before? Or have suggestions how we might overcome this hurdle? I'm puzzling this one through in the meantime... Thank you... Regards, Michael

1 0

Using boost interprocess file_lock.timed_lock
by Bill Moo 30 Jul '11

30 Jul '11

Hello List, Could someone please give me a working example of how to use this please. I am obviously doing something wrong as depending on how much I write to the std::ofstream I either end up with a proper file or a file containing a single byte! I would really appreciate your assistance with this as it's driving me to distraction. Here is the approach I am taking. std::ofstream os ; os.open(m_FileName.c_str(), std::ios_base::out | std::ios_base::binary | std::ios_base::app) ; try { if (os.is_open()) { os.setf(std::ios::fixed, std::ios::floatfield) ; os.precision(3) ; if (fileLock.timed_lock(pt += pt::seconds(5))) { try { for (int o = 0; o < 48; o++) { os << "Write my data here....." ; for (int i = 0; i < 51) { os << i ; // But if I output this simple line and I get a 1 byte file and NO errors or exceptions! } } fileLock.unlock() ; } catch (std::ofstream::failure e) { qDebug() << e.what() ; } } else { qDebug() << "No lock on file!" ; } } else { qDebug() << "File not opened!" ; } } catch (ip::interprocess_exception& e) { qDebug() << e.what() ; } catch (std::exception& e) { qDebug() << e.what() ; } os.close(); -- Bill

4 6

vxworks and pre-built boost libraries
by Brian Vandenberg 29 Jul '11

29 Jul '11

I'm attempting to use boost in vxworks 6.5 and I'm looking for information on how to get the pre-built libraries to build (those that can be). Some amount of support for vxworks was added back in 1.38, but vxworks isn't on the list of available/supported target OSs. Are there any resources out there detailing what can be made to work/does work/doesn't work, and what needs to be done to get the workable stuff to build? Thanks for your time. -Brian

2 5

[units] runtime conversion approach
by Michael Powell 29 Jul '11

29 Jul '11

Units developers/user, I need some help understanding unit conversions using boost::units. I see there are conversions.hpp header files. Does this mean that there are built-in unit conversions for fundamental units, or even mainstream derived ones by simply including the conversions and performing the appropriate operation? Can I do something like this, for instance? quantity<si::length> test_m = 1.0 * meter; quantity<us::inch> test_in = test_m * inch / meter; What is the best way to go about setting up conversions, or for that matter, defining a unit system; for instance, the us (english) unit system does not appear to be available? I've read a couple of the old mailing list entries, but I'm not sure I fully understand the examples that I could follow them. Thank you... Regards, Michael

2 1

noncopyable and move semantics
by Nathan Ridge 29 Jul '11

29 Jul '11

Hello, The current implementation of boost::noncopyable prevents derived classes from declaring a defaulted move constructor: #include <boost/noncopyable.hpp> struct S : boost::noncopyable { S(S&&) = default; }; S f(); int main() { S s = f(); } Errors (with gcc trunk): test3.cpp: In function 'int main()': test3.cpp:12:13: error: use of deleted function 'S::S(S&&)' test3.cpp:5:5: error: 'S::S(S&&)' is implicitly deleted because the default definition would be ill-formed: /usr/include/boost/noncopyable.hpp:27:7: error: 'boost::noncopyable_::noncopyable::noncopyable(const boost::noncopyable_::noncopyable&)' is private test3.cpp:5:5: error: within this context The problem is that the default move constructor for S tries to move the noncopyable base subobject, but noncopyable does not have a move constructor (one isn't generated implicitly because a user-defined copy constructor is present). Then it tries to fall back to the noncopyable copy constructor, but that of course is private. If we give the definition of the S move constructor explicitly, all is well because no one is trying to move or copy the noncopyable subobject: struct S : boost::noncopyable { S(S&&) {} }; However, having to define the move constructor explicitly is annoying and a maintenance hazard (e.g. if you add a data member, you have to add it to the move constructor too). If we modify noncopyable to give it a move constructor, the defaulted move constructor now works in derived classes. I think we should either give noncopyable a move constructor, or add a similar class ("noncopyable_but_movable"? - I'm bad with names) that is like noncopyable but also has a move constructor. Thoughts? Regards, Nate.

3 10

xlC 9.0 Boost 1.40 on Aix error
by Radha 29 Jul '11

29 Jul '11

Hi, I hit on the following error when i compile a code with boost 1.46 on Aix with xlC 9. boost_1_46/boost/proto/detail/poly_function.hpp", line 164.25: 1540-0038 (S) The name "typename result::result_type" is not a type. Is this a known issue? Any known patch to make it work? Regards, Radha

1 0

[geometry] intersects bug?
by Akira Takahashi 29 Jul '11

29 Jul '11

Hi, I try boost::geometry::intersects algorithm(1 arg version) in Boost 1.47.0. Follow program result is "false". but, I hope result is "true". Is this Boost.Geometry bug? #include <iostream> #include <boost/assign/list_of.hpp> #include <boost/geometry/geometry.hpp> namespace bg = boost::geometry; int main() { typedef bg::model::d2::point_xy<double> point; const bg::model::linestring<point> line = boost::assign::list_of<point> // (0, 0) // result become "true" when comment-in (0, 4) (4, 4) (2, 2) (2, 5) ; const bool result = bg::intersects(line); std::cout << std::boolalpha << result << std::endl; } Regards, >>======================== Akira Takahashi mailto:faithandbrave@gmail.com blog: http://d.hatena.ne.jp/faith_and_brave/

2 3

Segfault when trying to deserialize std::lists in a multi_array
by Jiří Vyskočil 28 Jul '11

28 Jul '11

Hello, I'm working on a parallel physical simulation involving particles in a 3D grid. In addition to Boost libraries, I use the Eigen3 template library for holding numerical data in small 3-vectors. I'm trying to send a 3D boost::multi_array containing std::list of pointers to particle structs via boost::mpi and keep getting a segfault on receive. Sending and receiving boost::multi_array of V3D Eigen3 vectors works fine. Serialization functions for multi_array are from http://tinyurl.com/3koafmr (edited for 3 dimensions, seems to work) Serializing Eigen Vector3d type (seems to work): friend class boost::serialization::access; template<class Archive> inline void serialize(Archive & ar, const unsigned int file_version) { ar & m_coeffs.x(); ar & m_coeffs.y(); ar & m_coeffs.z(); } typedef Vector3d V3D; //Convenience typedef for Eigen3 vector struct Particle { V3D r, u; double m, q; unsigned number; friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int file_version) { ar & r; ar & u; ar & m; ar & q; ar & number; } }; Sending point: typedef boost::multi_array<std::list<Particle*>, 3> ParticleArray; ParticleArray part_array(boost::extents[x][y][z]); ...fill the array with particles, some cells might be empty... world->isend(recnum, pack_type, part_array); Receiving point: ParticleArray part_array(boost::extents[slice->shape()[0]][slice->shape()[1]][slice->shape()[2]]); world->recv(sendnum, pack_type, part_array); When I get here, it segfaults: terminate called after throwing an instance of 'boost::archive::archive_exception' what(): class version # 0 0 Program received signal SIGABRT, Aborted. 0x00007ffff5a29a25 in raise () from /lib64/libc.so.6 (gdb) bt #0 0x00007ffff5a29a25 in raise () from /lib64/libc.so.6 #1 0x00007ffff5a2b0af in abort () from /lib64/libc.so.6 #2 0x00007ffff64fb695 in __gnu_cxx::__verbose_terminate_handler () at /var/tmp/portage/sys-devel/gcc-4.4.5/work/gcc-4.4.5/libstdc++-v3/libsupc++/vterminate.cc:93 #3 0x00007ffff64f9ac6 in __cxxabiv1::__terminate (handler=0x70d) at /var/tmp/portage/sys-devel/gcc-4.4.5/work/gcc-4.4.5/libstdc++-v3/libsupc++/eh_terminate.cc:38 #4 0x00007ffff64f9af3 in std::terminate () at /var/tmp/portage/sys-devel/gcc-4.4.5/work/gcc-4.4.5/libstdc++-v3/libsupc++/eh_terminate.cc:48 #5 0x00007ffff64f9bee in __cxxabiv1::__cxa_throw (obj=<value optimized out>, tinfo=<value optimized out>, dest=<value optimized out>) at /var/tmp/portage/sys-devel/gcc-4.4.5/work/gcc-4.4.5/libstdc++-v3/libsupc++/eh_throw.cc:83 #6 0x000000000044f7d5 in boost::archive::detail::iserializer<boost::mpi::packed_iarchive, Particle>::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned int) const () #7 0x00007ffff794173b in load_object (this=0x7fffffffcae0, t=<value optimized out>, bis=...) at libs/serialization/src/basic_iarchive.cpp:367 #8 boost::archive::detail::basic_iarchive::load_object (this=0x7fffffffcae0, t=<value optimized out>, bis=...) at libs/serialization/src/basic_iarchive.cpp:547 #9 0x000000000044f662 in boost::archive::detail::pointer_iserializer<boost::mpi::packed_iarchive, Particle>::load_object_ptr(boost::archive::detail::basic_iarchive&, void*&, unsigned int) const () #10 0x00007ffff7941c50 in load_pointer (this=0x7fffffffcae0, t=@0x7fffffffc880, bpis_ptr=0x668060, finder=<value optimized out>) at libs/serialization/src/basic_iarchive.cpp:494 #11 boost::archive::detail::basic_iarchive::load_pointer (this=0x7fffffffcae0, t=@0x7fffffffc880, bpis_ptr=0x668060, finder=<value optimized out>) at libs/serialization/src/basic_iarchive.cpp:560 #12 0x000000000044ed6f in boost::archive::detail::iserializer<boost::mpi::packed_iarchive, std::list<Particle*, std::allocator<Particle*> > >::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned int) const () #13 0x00007ffff79416fa in load_object (this=0x7fffffffcae0, t=<value optimized out>, bis=...) at libs/serialization/src/basic_iarchive.cpp:399 #14 boost::archive::detail::basic_iarchive::load_object (this=0x7fffffffcae0, t=<value optimized out>, bis=...) at libs/serialization/src/basic_iarchive.cpp:547 #15 0x000000000044ffb4 in boost::archive::detail::iserializer<boost::mpi::packed_iarchive, boost::multi_array<std::list<Particle*, std::allocator<Particle*> >, 3ul, std::allocator<std::list<Particle*, std::allocator<Particle*> > > > >::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned int) const () #16 0x00007ffff79416fa in load_object (this=0x7fffffffcae0, t=<value optimized out>, bis=...) at libs/serialization/src/basic_iarchive.cpp:399 #17 boost::archive::detail::basic_iarchive::load_object (this=0x7fffffffcae0, t=<value optimized out>, bis=...) at libs/serialization/src/basic_iarchive.cpp:547 #18 0x00000000004516f9 in boost::mpi::status boost::mpi::communicator::recv_impl<boost::multi_array<std::list<Particle*, std::allocator<Particle*> >, 3ul, std::allocator<std::list<Particle*, std::allocator<Particle*> > > > >(int, int, boost::multi_array<std::list<Particle*, std::allocator<Particle*> >, 3ul, std::allocator<std::list<Particle*, std::allocator<Particle*> > > >&, mpl_::bool_<false>) const () #19 0x000000000044982d in recv<ParticleArray> (this=0x66b150, slice=0x8779e0, pack_type=<value optimized out>, sendnum=1) at /usr/include/boost/mpi/communicator.hpp:1201 #20 Communicator::receive (this=0x66b150, slice=0x8779e0, pack_type=<value optimized out>, sendnum=1) at /home/strazce/prog/opice/opice/src/communicator.cpp:62 #21 0x000000000043d512 in Experiment::run (this=0x66b0c0) at /home/strazce/prog/opice/opice/src/experiment.cpp:96 #22 0x000000000042c13c in main (argc=1, argv=0x7fffffffd158) at /home/strazce/prog/opice/opice/src/opice.cpp:29 (gdb) Again, this error only shows when receiving the multi_array of std::list<Particle*>. multi_array of V3D is received fine. Thanks for any help, Jiri Vyskocil

3 5

Multiple Inheritance and enable_shared_from_this
by Travis Gockel 28 Jul '11

28 Jul '11

In my code base, we use the wonderful enable_shared_from_this template quite frequently. However, I came across an *interesting* problem while mocking some classes for unit tests. I compiled the following code with g++ 4.4.3 and Boost 1.46.1 (the same as the attached code): #include <boost/enable_shared_from_this.hpp> #include <boost/make_shared.hpp> #include <boost/smart_ptr.hpp> #include <iostream> class base : public boost::enable_shared_from_this<base> { public: boost::shared_ptr<base> get_shared_from_base() { return shared_from_this(); } }; class derived : public base, public boost::enable_shared_from_this<derived> { public: boost::shared_ptr<derived> get_shared_from_derived() { return boost::enable_shared_from_this<derived>::shared_from_this(); } }; int main() { boost::shared_ptr<derived> thing = boost::make_shared<derived>(); boost::shared_ptr<derived> derived_thing = thing->get_shared_from_derived(); boost::shared_ptr<base> base_thing = thing->get_shared_from_base(); return 0; } This is what I expect: I expect the get_shared_from_derived call to work, since the _internal_accept_owner would visit it. I would also expect the call to get_shared_from_base to fail with a bad_weak_ptr, since it looks like there is only one call in shared_ptr's constructor. I expect that the actual behavior is probably undefined, since it would depend on which association the compiler feels more strongly about: the enable_shared_from_this<derived> from derived or the enable_shared_from_this<base> from base. What I expect is, of course, not happening, which is why I turn to the Boost gurus. *Neither* of the calls work: they both fail with a bad_weak_ptr. Why would this happen? -- - Travis Gockel

2 1

Cufflinks building with problems in boost
by aquleaf 28 Jul '11

28 Jul '11

I'm trying to install Cufflinks but I failed. It read: make all-recursive make[1]: Entering directory `/usr/local/src/cufflinks-1.0.3' Making all in src make[2]: Entering directory `/usr/local/src/cufflinks-1.0.3/src' g++ -Wall -Wno-strict-aliasing -g -gdwarf-2 -Wuninitialized -march=i686 -O3 -DNDEBUG -pthread -I/usr/local/boost/include -I/usr/local/samtools-0.1.17/include -o cufflinks -L/usr/local/boost/lib -L/usr/local/samtools-0.1.17/lib cufflinks.o libcufflinks.a libgc.a -lboost_thread -lbam -lz /usr/local/boost/lib/libboost_thread.a(thread.o): In function `_ZN5boost2CV23simple_exception_policyItLt1ELt31ENS_9gregorian16bad_day_of_monthEE8on_errorEttNS0_14violation_enumE.clone.79': thread.cpp:(.text+0x5d3): undefined reference to `__sync_fetch_and_add_4' /usr/local/boost/lib/libboost_thread.a(thread.o): In function `_ZN5boost2CV23simple_exception_policyItLt1400ELt10000ENS_9gregorian8bad_yearEE8on_errorEttNS0_14violation_enumE.clone.96': thread.cpp:(.text+0x107b): undefined reference to `__sync_fetch_and_add_4' /usr/local/boost/lib/libboost_thread.a(thread.o): In function `_ZN5boost2CV23simple_exception_policyItLt1ELt12ENS_9gregorian9bad_monthEE8on_errorEttNS0_14violation_enumE.clone.97': thread.cpp:(.text+0x13df): undefined reference to `__sync_fetch_and_add_4' /usr/local/boost/lib/libboost_thread.a(thread.o): In function `_ZN5boost9date_time14microsec_clockINS_10posix_time5ptimeEE11create_timeEPFP2tmPKlS6_E.clone.111': thread.cpp:(.text+0x1e3d): undefined reference to `__sync_fetch_and_add_4' collect2: ld returned 1 exit status make[2]: *** [cufflinks] Error 1 make[2]:Leaving directory `/usr/local/src/cufflinks-1.0.3/src' make[1]: *** [all-recursive] Error 1 make[1]:Leaving directory `/usr/local/src/cufflinks-1.0.3' make: *** [all] Error 2 I guess there may be some problems with boost. What should I do? -- View this message in context: http://boost.2283326.n4.nabble.com/Cufflinks-building-with-problems-in-boos… Sent from the Boost - Users mailing list archive at Nabble.com.

1 0

[iostreams] building with zlib
by Daniel Bradburn 28 Jul '11

28 Jul '11

Dear boost-users, I am trying to use the compression filters with boost.iostreams. I'm following the instructions here http://www.boost.org/doc/libs/1_47_0/libs/iostreams/doc/index.html?path=7 for building, this is my command line (from libs/iostreams/build): "../../../bjam" -sZLIB_SOURCE="C:/Documents and Settings/bradburnd/My Documents/Development/SDK/zlib/1.2.5" I get the following error: ..\..\..\libs\iostreams\src\zlib.cpp(20) : fatal error C1083: Cannot open include file: 'zlib.h': No such file or directory I checked my zlib install location and the zlib.h is at the correct location. Based on what I see in the documentation I don't see why this shouldn't be working. Is there something I'm missing? I am using Windows XP, msvc-9.0 boost 1.45 Best Regards Daniel Bradburn

4 4

pcap_loop callback with boost::function and boost::bind
by Clemens Gruber 28 Jul '11

28 Jul '11

Hi, I am writing a statistical protocol analyzer running under Windows with WinPcap. The problem is: The pcap_loop function for starting to capture the packets wants a C style callback function, but I need that callback function to have access to several class variables, so this callback function should be a member function. I know that it is not possible to use a member function directly, because of the additional parameter, the pointer to the class. I thought, maybe I could use boost::function and boost::bind, but I am not sure if my solution is correct, so it would be very nice if some of you guys could just look over it and tell me if this is a good way to do this. This is my code for starting the capture: void MyClass::startCapturing() { boost::function < void (u_char *, const struct pcap_pkthdr *, const u_char *) > f; f = boost::bind(&MyClass::packetHandler, this, _1, _2, _3); pcap_handler p = *(f.target<pcap_handler>()); pcap_loop(hnd, 0, p, NULL); } This the callback function I want pcap_loop to call: void MyClass::packetHandler(u_char *param, const struct pcap_pkthdr *header, const u_char *pkt_data) { /* Do something with the packet.. */ } And this is the signature of the callback argument in the pcap_loop function, as defined in pcap.h: typedef void(*) pcap_handler(u_char *param, const struct pcap_pkthdr *pkt_header, const u_char *pkt_data) If you have an alternative, I would be glad to hear it! Maybe there's a much simpler solution, I didn't think about. Best regards, Clemens

2 1

MSVC Visualizers Update
by Filip Konvička 28 Jul '11

28 Jul '11

Hi all, I've just updated the Boost visualizers wiki page at https://svn.boost.org/trac/boost/wiki/DebuggerVisualizers I updated the visualizer for Boost.MultiIndex, which did not work since Boost 1.35. I also added new visualizers for Boost.DateTime (ptime and time_duration) and a simple boost::shared_ptr visualizer. The visualizers are available for checkout via SVN at https://svn.boost.org/svn/boost/sandbox/boost_docs/subprojects/DebuggerVisu… Cheers, Filip

6 7

astar_search_no_init
by anilpanicker 28 Jul '11

28 Jul '11

I'm trying to compile the puzzle 8 given in this link http://www.cs.rpi.edu/~beevek/research/astar_bgl04.pdf using astar_search_no_init() but I get this error "error C2106: '=' : left operand must be l-value" I'm using VS2010. Can someone please help me Here is my entire code #include<boost/graph/adjacency_list.hpp> #include<boost/graph/astar_search.hpp> #include<iostream> #include<vector> #include<list> using namespace std; using namespace boost; class puzzle_state_t: public vector<int> { public: int m_row,m_col; // row and columns puzzle_state_t(){} puzzle_state_t(int r,int c): vector<int>(r*c),m_row(r),m_col(c){} //another ctor with some iterator template<typename IteratorType> puzzle_state_t(int r,int c,IteratorType beg,IteratorType en): vector<int>(beg,en)m_row(r),m_col(c){} //find the cell in the vector // rows are numbered 0,1,2 // cols are numbered 0,1,2 inline int cell(int r, int c) const { return r*m_col+c; //gives the index of vector } //get value of a cell inline int get(int r, int c) const { int index= cell(r,c); return operator[] (index);// returns value } //move between two cells inline void move(int i,int j) { int tmp=operator[] (j); operator[](j)=operator[](i); operator[](i)=tmp; } //find coordinates of an offset inline void coords(int i, int &r, int &c) const { r=i/m_col; c=i%m_col; } friend ostream& operator <<(ostream &out, const puzzle_state_t &p) { for(int i = 0; i < p.m_row; ++i) { for(int j = 0; j < p.m_col; ++j) { if(p.get(i, j) > 0) cout << p.get(i, j)<<"\t" ; else cout << "-"<<"\t"; } cout << endl; } return out; } }; //1. find out the cell with zero void generate_children(const puzzle_state_t &p, list<puzzle_state_t> &children ) { puzzle_state_t::const_iterator const_it= find(p.begin(),p.end(),0); int soffset= const_it-p.begin(); //index of array int sr,sc; p.coords(soffset,sr,sc);// got the cell if(sc>0) {//mode tile to left children.push_back(p); children.back().move(soffset,p.cell(sr,sc-1) ); } if(sc<p.m_col-1) {//move to right children.push_back(p); children.back().move(soffset,p.cell(sr,sc+1)); } if(sr>0) {//move tile to above children.push_back(p); children.back().move(soffset,p.cell(sr-1,sc) ); } if(sr<p.m_row-1) { children.push_back(p); children.back().move(soffset,p.cell(sr+1,sc) ); } } //Graph and related types //a new property tag struct vertex_puzzle_state_t { typedef vertex_property_tag kind; }; //define VertexProperties typedef property<vertex_color_t, default_color_type, property<vertex_rank_t, unsigned int, property<vertex_distance_t, unsigned int, property<vertex_predecessor_t, unsigned int, property<vertex_puzzle_state_t, puzzle_state_t, property<vertex_index_t,unsigned int> > > > > > VertexProperties; //define EdgeProperties typedef property<edge_weight_t, unsigned int> EdgeProperties; //Define Graph_type typedef adjacency_list<listS,vecS,undirectedS,VertexProperties,EdgeProperties,no_property,listS> graph_t; typedef graph_traits<graph_t>::vertex_descriptor vertex_t; typedef graph_traits<graph_t>::edge_descriptor edge_t; typedef graph_traits<graph_t>::vertex_iterator vit; typedef graph_traits<graph_t>::edge_iterator eit; //property maps //Named Parameter version //IN:weight_map- length of each edge //IN: vertex_index_map- typedef property_map<graph_t,edge_weight_t>::type WeightMap; typedef property_map<graph_t,vertex_index_t>:: type IndexMap; //OUT: predecessor_map //Out: distance_map //OUT: rank_map //OUT: color_map typedef property_map<graph_t,vertex_predecessor_t>::type PredMap; typedef property_map<graph_t,vertex_distance_t>::type DistanceMap; typedef property_map<graph_t,vertex_rank_t>::type RankMap; typedef property_map<graph_t,vertex_color_t>::type ColorMap; // custom mpa typedef property_map<graph_t,vertex_puzzle_state_t>::type StateMap; struct found_goal{}; template<typename Vertex> class puzzle_visitor : public boost::default_astar_visitor { private: list<vertex_t> &m_verticesList; puzzle_state_t &m_goal_state; public: puzzle_visitor(list<vertex_t> & vlist,puzzle_state_t &goal): m_verticesList(vlist),m_goal_state(goal){} template <class Graph> void examine_vertex(Vertex u, Graph& g) {// add states and break if it reached goal state StateMap smap= get(vertex_puzzle_state_t,g); WeightMap wmap= get(edge_weight_t,g); ColorMap cmap= get(vertex_color_t,g); if(smap[u]==m_goal) throw found_goal(); //add successors of state list<puzzle_state_t> new_vertices; generate_children(smap[u],new_vertices ); list<puzzle_state_t>::iterator it; for(it=new_vertices.begin(); it != new_vertices.end(); ++it) { //make sure this is a new state vit vi,vend; for(tie(vi,vend)=vertices(g); vi != vend; ++vi) { if(*vi== *it ) break; } if(vi != vend)//not new { pair<edge_t,bool> eAdded=add_edge(u,*vi,g); if(eAdded) put(wmap,eAdded.first); }else {//new Vertex v= add_vertex(g); put(cmap,v,white_color); pair<edge_t,bool> eAdded=add_edge(u,v,g); if(eAdded) put(wmap,eAdded.first) } } } }; // the distance huristics // sum of (row_goal-row_current) + (col_goal-col_current) for all tiles class manhattan_dist: public astar_heuristic<graph_t,unsigned int> { puzzle_state_t &m_goal_state; StateMap m_smap; inline unsigned int myabs(int i) { return static_cast<unsigned int> (i<0 ? -i:i); } public: manhattan_dist(puzzle_state_t &goal, StateMap &smap): m_goal_state(goal),m_smap(smap){} unsigned int operator() (vertex_t u) { unsigned int md=0; puzzle_state_t::const_iterator it_i,it_j; int ir,ic,jr,jc; for(it_i=m_smap[u].begin(); it_i != m_smap[u].end(); ++it_i) { it_j=find(m_goal_state.begin(),m_goal_state.end(),*it_i); m_smap[u].coords(it_i - m_smap[u].begin(), ir, ic); m_goal_state.coords(it_j - m_goal_state.begin(), jr, jc); md += myabs(jr - ir) + myabs(jc - ic); } return md; } }; int main() { //set up start_state and goal_puzzle state graph_t g; list<vertex_t> examine_seq; //maps //IN IndexMap indexMap= get(vertex_index,g); WeightMap wmap= get(edge_weight_t (),g); //OUT DistanceMap dmap= get(vertex_distance,g); ColorMap cmap= get(vertex_color,g); PredMap predessors= get(vertex_predecessor,g); RankMap rmap= get(vertex_rank,g); //custom map StateMap smap= get(vertex_puzzle_state_t (),g); //add first vertex vertex_t start = add_vertex(g); put(cmap,start,white_color); put(dmap,start,0); // int sstart []= {1,3,4,8,0,2,7,6,5}; int sgoal []= {1,2,3,8,0,4,7,6,5}; //smap[start]= puzzle_state_t(3,3,&sstart[0],&sstart[9] ); puzzle_state_t p(3,3); puzzle_state_t goal(3,3); for(int i=0; i<9; ++i) { p[i]=sstart[i]; goal[i]=sgoal[i]; } smap[start]= p; cout<<"Start state"<<endl<<endl; cout<< smap[start]<<endl; cout<<"Goal state"<<endl<<endl; cout<<goal<<endl; // puzzle_visitor<vertex_t> vis(examine_seq,goal); manhattan_dist m_dist_heuristic(goal,smap); astar_search_no_init(g, start, //source m_dist_heuristic,// heuristic visitor(vis).// vis vertex_index_map(indexMap).// IN: index_map weight_map(wmap).//IN: weight_map predecessor_map(predessors).//OUT distance_map(dmap).//OUT color_map(cmap).//OUT rank_map(rmap)//OUT ); return 0; } -- View this message in context: http://boost.2283326.n4.nabble.com/astar-search-no-init-tp3680535p3680535.h… Sent from the Boost - Users mailing list archive at Nabble.com.

3 3

bind with mem_fn style in Visual Studio 8
by John M. Dlugosz 28 Jul '11

28 Jul '11

My compiler crashes when I write: bind(&S::bar, &s1); is there some known issue with VS8? It's right after a warning issued in the mem_fn header concerning superfluous modifiers.

6 12

[Review] Lockfree review: today (July 28th) is the last day
by Hartmut Kaiser 28 Jul '11

28 Jul '11

All, Today is the last day of the review of Tim Blechmann's Lockfree library. If you're interested in this library, please consider contributing a review! If you need more time, please contact me privately. Please see the original (slightly corrected) announcement below: ----------------------------------------------------- About the library: Boost.Lockfree provides implementations of lock-free data structures. Lock-free data structures can be accessed by multiple threads without the necessity of blocking synchronization primitives such as guards. Lock-free data structures can be used in real-time systems, where blocking algorithms may lead to high worst-case execution times, to avoid priority inversion, or to increase the scalability for multi-processor machines. The following data structures are provided: - boost::lockfree::fifo, a lock-free fifo queue - boost::lockfree::stack, a lock-free stack - boost::lockfree::ringbuffer, a wait-free single-producer/single-consumer ringbuffer. The library is accessible from here: http://tim.klingt.org/boost_lockfree.tar.gz. Boost.Lockfree depends on C++0x atomics. They are not well supported with current compilers yet. For this reason Boost.Lockfree depends on the *unreviewed* Boost.Atomic library, that emulates C++0x atomics for C++98. This review is about Boost.Lockfree and not about Boost.Atomic, although it is included in the tarball and the git repository. If Boost.Lockfree will be accepted, it won't be merged into trunk before Boost.Atomic is accepted. --------------------------------------------------- Please always state in your review, whether you think the library should be accepted as a Boost library! Additionally please consider giving feedback on the following general topics: - What is your evaluation of the design? - What is your evaluation of the implementation? - What is your evaluation of the documentation? - What is your evaluation of the potential usefulness of the library? - Did you try to use the library? With what compiler? Did you have any problems? - How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? - Are you knowledgeable about the problem domain? Regards Hartmut Review Manager

1 0

Odd Warning in transform_iterator.hpp ?
by John M. Dlugosz 28 Jul '11

28 Jul '11

I'm using the current Boost library on Microsoft Visual Studio 2005. I'm getting a warning on line 121 of transform_iterator.hpp, complaining "returning address of local variable or temporary". The line in question is the body of this function: typename super_t::reference dereference() const { return m_f(*this->base()); } My m_f supplied to the template is ordinary enough; it returns a value. The exact same situation in a unit test gives no complaint! Any idea what this is all about?

2 3

Linker options
by Sergiy Nazarenko 28 Jul '11

28 Jul '11

Hi everyone! I'm begginers to use bjam and boost. I've built python-extension. I successfully compiled it by bjam. My Jamroot file like this: use-project boost : ../../.. ; project : requirements <library>/boost/python//boost_python ; python-extension myext : myext.cpp ; And I have custom shared library with extra functions . Now I'm trying to use extra functions in python library. My questions is how put linker options in bjam project? Something like this: -L/path/to/my/library/lib64/ -lmylib.0.1 If I append include options for a file, my MyLib.h is found but linker does not find library itself. I append like this: python-extension myext : myext.cpp <include>/path/to/my/library/include; I've tried to use following # <library-path>/path/to/my/library/lib64/ # <library-file>mylib.0.1.so but with these options my extension is not compiled. Cheers,

1 0

Boost Shared Memory Compilation Issue
by Nathan Lewis 27 Jul '11

27 Jul '11

What an great library! I am trying to extend one of the shared memory examples but I am getting a compilation error. Basically I have added a vector of char_strings to the complex object and added a method to add a string to the vector. If anyone would take a moment to give me suggestion for how to fix this issue or a suggestion for how I should better add strings to this vector I would appreciate your input. The error is: error C2664: 'void boost::container::vector<T,A>::push_back(const boost::interprocess::rv<T> &)' : cannot convert parameter 1 from 'char_string *' to 'const boost::interprocess::rv<T> &' with [T=char_string, A=char_allocator] and[T=boost::container::basic_string<char,std::char_traits<char>,char_allocator>] Reason: cannot convert from 'char_string *' to 'const boost::interprocess::rv<T>' with [T=boost::container::basic_string<char,std::char_traits<char>,char_allocator>] No constructor could take the source type, or constructor overload resolution was ambiguous The code is: #include <boost/interprocess/managed_shared_memory.hpp> #include <boost/interprocess/allocators/allocator.hpp> #include <boost/interprocess/containers/map.hpp> #include <boost/interprocess/containers/vector.hpp> #include <boost/interprocess/containers/string.hpp> using namespace boost::interprocess; //Typedefs of allocators and containers typedef managed_shared_memory::segment_manager segment_manager_t; typedef allocator<void, segment_manager_t> void_allocator; typedef allocator<int, segment_manager_t> int_allocator; typedef vector<int, int_allocator> int_vector; typedef allocator<int_vector, segment_manager_t> int_vector_allocator; typedef vector<int_vector, int_vector_allocator> int_vector_vector; typedef allocator<char, segment_manager_t> char_allocator; typedef basic_string<char, std::char_traits<char>, char_allocator> char_string; typedef vector<char_string, char_allocator> char_string_vector_vector; class complex_data { public: //Obviously making the variables of complex_data public isn't a good idea I am just playing here for the moment int id_; char_string char_string_; char_string_vector_vector char_string_vector_vector_; double price_; //Since void_allocator is convertible to any other allocator<T>, we simplify //the initialization taking just one allocator for all inner containers. complex_data(int id, const char *name, double prce, const void_allocator &void_alloc) : id_(id), char_string_(name, void_alloc), char_string_vector_vector_(void_alloc), price_(prce) {} // add a string --> Error is on the next line void addStringItem(char_string* s){char_string_vector_vector_.push_back(s);} }; int main () { //Remove shared memory on construction and destruction struct shm_remove { shm_remove() { shared_memory_object::remove("MySharedMemory"); } ~shm_remove(){ shared_memory_object::remove("MySharedMemory"); } } remover; //Create shared memory managed_shared_memory segment(create_only,"MySharedMemory", 65536); //An allocator convertible to any allocator<T, segment_manager_t> type void_allocator alloc_inst (segment.get_segment_manager()); //Construct the shared memory map and fill it complex_data *mymap = segment.construct<complex_data>("Complex_Data")(7, "hi", 7.0, alloc_inst); // return 0; }

4 14

[Boost][Serialization] ASSERT triggered during reading 1.40 binary archive w/ Boost 1.47
by Marc Perso 27 Jul '11

27 Jul '11

Hello Booster, We are trying to jump from Boost 1.40 to Boost 1.47 but we are facing an issue: an ASSERT is raised in debug mode when reading back binary archive generated by Boost.Serialization 1.40 with the Boost.Serialization 1.47. This ASSERT is at line 116 in basic_archive.hpp: BOOST_ASSERT(t_ <= boost::integer_traits<base_type>::const_max) And it occurs with the following platform: MSVC 8.0 and Windows XP/32bits or Win7/64bits. Looking at the load_override and save_override implementations for class_id_type in #1.40, they seem loading and saving an 'int_least16_t' (equiv. to a short for our platform) while load_override(class_id_type) for #1.47 attempts to read an 'int' (file: basic_binary_iarchive.hpp @ line 98). My questions are: - This assert suggests that we can't read back previous binary archives (#1.40 at least) with Boost.Serialization 1.47, is this a known pending issue for Boost.Serialization? - If yes, how we can manage that and how we can complete the migration to 1.47 in our case (it should be noted that we must be able to read back our 1.40 binary archives)? Is there any known patch for this problem? Any assistance will be greatly appreciated. Best regards, Marc Viala PS: I'm not sure but ticket #5567 seems already opened on this issue but has not been yet fixed (https://svn.boost.org/trac/boost/ticket/5567)

1 0

TR1 on Mac OS X
by John M. Dlugosz 27 Jul '11

27 Jul '11

It seems that the CLANG compiler that is used for Mac development, Apple LLVM 2.1, is missing _some_ of the TR1 headers. For example, it has <array>, but does not find <type_traits>. If the |boost-install-path/boost/tr1/tr1 is put first in the include path, is it set up to use the native stuff that does exist, and Boost for the rest? What about the per-feature usage that is used within the library, <boost/tr1/xxxxx.hpp> ? Will that bring in the native <array>, but the Boost type_traits.hpp? Any general suggestions on writing portable code on the Mac that will use TR1 and whatever newer features are available? Thanks, —John |

2 1

[Boost.Serialization] Dealing with offsets
by Júlio Hoffimann 27 Jul '11

27 Jul '11

Dear Boost users/devs, Suppose i have a simulator S: R^n ---> R such that each run is during about 1 hour. Even using Boost.MPI, is expensive to run thousands of simulations all the time. To solve this problem, i'm wondering in use Boost.Serialization to store the pairs inputs/output in a boost::serialization::binary_archive and check before run if those inputs had an associated output already. By reading the Boost.Serialization docs, i can't found a way to deal with offsets in the archive, in really i don't know if it's possible. My intention is to get an archive like: 1.3, 2.5, ..., 4.6 0.1, 4.3, ..., 5.0 ... ... 123445 1234542 9893 1234 ... and skip the first rows, which are the inputs, to get the associated outputs. If you have any advice to solve this or know another more appropriate approach for this restart feature, please let me know. The second option i have in mind is work with C++ file streams and save the floating points by using the low-level std::fstream::read std::fstream::write functions. Best regards, Júlio.

1 0

ASIO async_accept() and c++2011 lambas
by Claude 27 Jul '11

27 Jul '11

Hi, I found this example for use the async_accept() method: void accept_handler(const boost::system::error_code& error) { if (!error) { // Accept succeeded. } } ... boost::asio::ip::tcp::acceptor acceptor(io_service); ... boost::asio::ip::tcp::socket socket(io_service); acceptor.async_accept(socket, accept_handler); It is possible use the async_accept with a (c++0x) lambda function instead of the function accept_handler()? -- View this message in context: http://boost.2283326.n4.nabble.com/ASIO-async-accept-and-c-2011-lambas-tp36… Sent from the Boost - Users mailing list archive at Nabble.com.

4 7

Chrono.hpp
by Sarkar, Arup 27 Jul '11

27 Jul '11

Hi: I am just getting to know boost library, I was able to execute the lambda program mentioned in the documentation without any problem. Now I am trying out with chrono, so I am doing the following, I am getting an error. #include <boost/chrono/chrono.hpp> Same is true for posix_time.hpp as well, the error says Cannot open include library file: 'boost/chrono/chrono.hpp' No such file or directory, but it is not complaining when I am using lambda. Can anyone please help. Regards, Arup

2 2

Is now a good time to use Boost.Log?
by bear330 27 Jul '11

27 Jul '11

Hi, I am looking for a good logging library, I very like boost libraries and almost all my C++ projects use it. So the Boost.Log is the first choice I am considering. But Boost.Log is accepted for a long time and still not ship with latest Boost library. I heard about it is developing v2. I am not sure about its API will change a lot or not. If I use Boost.Log v1 now, would that be painful to upgrade to final Boost.Log that ships with Boost library? And is Boost.Log v1 efficient enough or stable enough just like other boost libraries? (I concern about that because it is not ship with boost release for a long time). Thanks a lot. -- View this message in context: http://boost.2283326.n4.nabble.com/Is-now-a-good-time-to-use-Boost-Log-tp36… Sent from the Boost - Users mailing list archive at Nabble.com.

2 1

[Python] Handling std::vector and boost::tuple
by Johan Råde 27 Jul '11

27 Jul '11

The following code fails with the error message: "Boost.Python.ArgumentError: Python argument types in m.f(list) did not match C++ signature: ..." How do I make it work? Do I have to write a custom translator? C++: void f(const vector<tuple<double, string, bool> >& x); BOOST_PYTHON_MODULE(m) { def("f", &f); } Python: import m m.f([(4.3, 'abc', True)]) Thank you, Johan Råde

2 2

boost::units units symbols/names
by Michael Powell 26 Jul '11

26 Jul '11

Boost::units users, How do I get at the unit symbol or name? I think this type thing would be essential when receiving and parsing textual quantities from a client side application. So say I am given "1.0 in" or "2.3 m/s^2" and so on, and be able to translate that into the appropriate compile-time dimensional quantity. Thanks... Regards, Michael

2 4

[cross-compiling]
by Wilde, Donald S 26 Jul '11

26 Jul '11

We have a somewhat tricky cross-compile, and I'm hoping I can get some feedback to help me be sure that I'm doing this right. In my user-config.jam, I (think I) need to put the following line: Using gcc : 4.5.1 : : "/path/to/target/compiler" <compileflags> -I/path/to/sdk/includes <cxxflags> -std=c++0x <cflags> -Wall -march=atom Does that sound right? Does boost depend on standard precompiled libraries like libstdc++.so? I've been bit by having the system crash hard in different places, and I suspect that sometimes this is caused by the fact that the host is i686 linux and the target is an atom-based SoC with custom linux libraries. Boost wants to pull them from the host, so I need to tell it everything it should NOT pull silently. Correct? Do I also need a <linkflags> -L/path/to/target/lib/directory? -- Don Wilde DHG | TSPO 480-552-3792 donald.s.wilde(a)intel.com

2 2

[Review] Lockfree review: two more days left
by Hartmut Kaiser 26 Jul '11

26 Jul '11

Hi all, We have two more days left for the review of Tim Blechmann's Lockfree library. If you're interested in this library, please consider contributing a review! Please see the original (slightly corrected) announcement below: ----------------------------------------------------- About the library: Boost.Lockfree provides implementations of lock-free data structures. Lock-free data structures can be accessed by multiple threads without the necessity of blocking synchronization primitives such as guards. Lock-free data structures can be used in real-time systems, where blocking algorithms may lead to high worst-case execution times, to avoid priority inversion, or to increase the scalability for multi-processor machines. The following data structures are provided: - boost::lockfree::fifo, a lock-free fifo queue - boost::lockfree::stack, a lock-free stack - boost::lockfree::ringbuffer, a wait-free single-producer/single-consumer ringbuffer. The library is accessible from here: http://tim.klingt.org/boost_lockfree.tar.gz. Boost.Lockfree depends on C++0x atomics. They are not well supported with current compilers yet. For this reason Boost.Lockfree depends on the *unreviewed* Boost.Atomic library, that emulates C++0x atomics for C++98. This review is about Boost.Lockfree and not about Boost.Atomic, although it is included in the tarball and the git repository. If Boost.Lockfree will be accepted, it won't be merged into trunk before Boost.Atomic is accepted. --------------------------------------------------- Please always state in your review, whether you think the library should be accepted as a Boost library! Additionally please consider giving feedback on the following general topics: - What is your evaluation of the design? - What is your evaluation of the implementation? - What is your evaluation of the documentation? - What is your evaluation of the potential usefulness of the library? - Did you try to use the library? With what compiler? Did you have any problems? - How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? - Are you knowledgeable about the problem domain? Regards Hartmut Review Manager

3 2

[boost-users] [geometry] segment concept
by Sergei Politov 26 Jul '11

26 Jul '11

Hello, I play with new boost geometry library. There is thing that I don't understand, possible it is bug. I'm trying to register segment concept. It is struct with fields named "point1" and "point2", that represents endpoints of this segment. I've specified tag, point_type, indexed_access for this struct. And length works fine. But intersection requires that this struct contains fields named "first" and "second". I'm new to this library, so I don't know whether it is bug in library or my code. I've attached minimal c++ file that reproduces the problem. If I uncomment //#define point1 first //#define point2 second all compiles and works fine. Best Regards, Sergey

2 5

[Serialization] Writing an old version of a class
by Don 26 Jul '11

26 Jul '11

I apologize if this is a duplicate posting. I sent this 2 days ago, and it appears in the archives, but I never received it back from the list and there have been no replies, so I am posting it again. Using boost serialization, I would like to be able to write an old version of a class, so that I can save data in an "old" format to allow other users with an old version of my program to read the file. I see from the archives that this has come up before, and Robert Ramey indicated it was doable and on the todo list, but I don't see it in the release notes or documentation. Did anything every come of this? Or, has anyone else done this? Any suggestions on how to accomplish this? Thanks, Don

4 4

[multiindex] Ordered index corruption
by Chris Jewell 26 Jul '11

26 Jul '11

Hi All, I have a problem with a multiindex ordered_non_unique index becoming corrupted :( I am working with a multiindex that stores class objects of type Individual: class Individual { double I_; double id_; public: double getId() const; double getI() const; void setId(const std::string id); void setI(const double I); } boost::multi_index_container< Individual, indexed_by< random_access< tag<bySeq> >, hashed_unique< tag<byId>, const_mem_fun<Individual,string,&Individual::getId> >, ordered_non_unique<tag<byI>, const_mem_fun<Individual,double,&Individual::getI> > > > I have an algorithm that works on these data, using Individual::I to calculate a summary value across the whole dataset. An Individual i is then chosen at random, and i.I updated using the multiindex::modify method with a functor: struct modifyI { modifyI(double newI) : newI_(newI) {} void operator()(Individual& i) { i.setI(newI_); } private: double newI_; }; This calculation is then repeated many times. The actual calculation is done in parallel using MPI (Boost::MPI on top of OpenMPI), with the final reduction being broadcast to all processes. This enables each processor to make the same change to its copy of the multiindex. In *theory* this should mean that each process has a complete replicate of the multiindex. However, I am finding that the ordered_non_unique index is becoming corrupted in that the ordering (strict less than on Individual::I) gets messed up for a few (c. 2 or 3) of the elements. Essentially, it appears that small blocks of the index get swapped round. This is not occurring simultaneously on all processes, which is odd because the same multiindex::modify method is called for each process with the same arguments. Can anyone suggest a way I can move forward on trying to debug this? Thanks, Chris -- Dr Chris Jewell Department of Statistics University of Warwick Coventry CV4 7AL UK Tel: +44 (0)24 7615 0778

2 2

Pointer "boundary checker" class or tools?
by Hoe-Phuan Ng 26 Jul '11

26 Jul '11

Hello: I a new to C++. Have not use it yet. For a long time I was wondering if there is a way to automatically check if pointer has creep out of its "known area of access" in memory. Obviously such tool to check pointer would be really slow or too slow for release codes since we want to check pointer location at each pointer access, read or write. Is there such a tool or class to do Pointer "boundary checker" during debug? Thanks. HP

4 3

Odd Warning in transform_iterator.hpp ?
by John M. Dlugosz 26 Jul '11

26 Jul '11

I'm using the current Boost library on Microsoft Visual Studio 2005. I'm getting a warning on line 121 of transform_iterator.hpp, complaining "returning address of local variable or temporary". The line in question is the body of this function: typename super_t::reference dereference() const { return m_f(*this->base()); } My m_f supplied to the template is ordinary enough; it returns a value. The exact same situation in a unit test gives no complaint! Any idea what this is all about?

1 0

boost::python::long_ issue
by Pavel Grafov 26 Jul '11

26 Jul '11

Hello, guys! In order to check how does boost::python works with long numbers I found this snippet of code (found it on the boost documentation page - http://www.boost.org/doc/libs/1_42_0/libs/python/doc/v2/long.html) namespace python = boost::python; // compute a factorial without overflowing python::long_ fact(long n) { if (n == 0) return python::long_(1); else return n * fact(n - 1); // here points the compiler } However, I cannot compile it - the compiler says "error: conversion from ‘boost::python::api::object’ to non-scalar type ‘boost::python::long_’ requested", pointing to the line marked. What am I doing wrong? Supposing multiplying is forbidden, is there another way to create a boost::python::long greater than the greatest long (2**32 - 1)? -- Best regards, Pavel.

1 0

HasPlus
by Robert Jones 26 Jul '11

26 Jul '11

Hi All I'm clutching at straws here, so this may be a complete fiction, but I seem to recall mention of purely syntactic concept definitions as part of the now-abandoned C++0x concept proposal. Things like hasPlus. Maybe I've just made this up! Does any such thing exist in boost anywhere? Maybe as a concept check or type trait? Thx - Rob.

3 2

[Thread] Assertion on mutex when using multiple threads and mutexes
by Tim van den Kerkhof 26 Jul '11

26 Jul '11

Hi all, As a part of a project I'm writing a logger function. This logger function sends an e-mail when the program wants to log something. Since it has happened that the SMTP server was non responsive, I've decided to do the sending of the mails in a separate thread. This thread reads messages from an std::deque which is filled by the logging function. The thread is setup as follows: while (!boost::this_thread::interruption_requested()) { EmailItem emailItem; { boost::unique_lock<boost::mutex> lock(mMutex); while (mEmailBuffer.empty()) mCond.wait(lock); bufferOverflow = mBufferOverflow; mBufferOverflow = false; nrOfItems = mEmailBuffer.size(); if (nrOfItems> 0) { emailItem = mEmailBuffer.front(); mEmailBuffer.pop_front(); } } if (nrOfItems> 0) { bool sent = false; while(!sent) { try { ..... Do something with the message ..... { boost::this_thread::disable_interruption di; boost::lock_guard<boost::mutex> lock(mLoggerMutex); mLogFile<< emailItem.mMessage<< std::endl; } sent = true; } catch (const std::exception&e) { // Unable to send mail, an exception occurred. Retry sending it after some time sent = false; boost::this_thread::sleep(boost::posix_time::seconds(LOG_WAITBEFORE_RETRY)); } } } } The function log() adds a new message to the deque (mEmailBuffer) as follows: { boost::lock_guard<boost::mutex> lock(mMutex); mEmailBuffer.push_back(e); mCond.notify_one(); } When the main program exits, the destructor of the logger object is called. This is where it goes wrong, the application crashes with an error: /usr/include/boost/thread/pthread/mutex.hpp:45: boost::mutex::~mutex(): Assertion `!pthread_mutex_destroy(&m)' failed. The destructor merely calls an interrupt on the thread and then joins it: mQueueThread.interrupt(); mQueueThread.join(); In the main program, I use multiple different classes which make use of boost threading and mutex as well, could this cause this behaviour? Not calling the destructor of the logger object results in no errors, as does using the logger object and not doing anything else. My guess is I am doing something very wrong, or there is a bug in the threading library when using multiple threads divided over several classes. Does anyone have a idea what the reason for this error might be? Regards, Tim van den Kerkhof

1 0

boost::units implicit conversions
by Michael Powell 25 Jul '11

25 Jul '11

Boost::units users, I have gotten my feet wet with boost::units over the past several days and starting to get the hang of it, dimensions, quantities, and units, and so forth. Now I would like to start thinking more in terms of how these units-based calculations should be used by the rest of our application. Of primary concern is to receive a quantity of dimension from the application in a specified unit and to be able to perform the calculations. One concept I've been wondering about is whether there is any value in converting units to a base unit for purposes of IPC (interprocess communication), saving to or loading from files, or that sort of thing. In this way we will know that if we see a quantity of length dimension, for instance, we can always expect the value to be presented in terms of, let's say, meters. My question concerning calculations is something along these lines: how does boost::units treat a quantity<dimension> when facilitating dimensioned calculations? Or is it on us as developers to ensure that an appropriate unit-conversion is taking place somewhere along the way when we are ready to interpret the result for display, report, or whatever? Let me know if I can clarify at all, because I am a little fuzzy along these lines at the moment. Thank you... Regards, Michael

2 1

[Fusion] issues when adapting an existing structure
by Sean Farrow 25 Jul '11

25 Jul '11

Hi: I'm trying to adapt a structure for use with spirit. I have the following code: struct JAWSFunction { std::wstring FunctionType; std::wstring Description; std::wstring Synopsis; std::string ReturnType; std::vector<std::pair<std::wstring, std::wstring> > Parameters; }; //tell boost.Fusion about the JAWSFunction structure to allow it to be used with spirit. BOOST_FUSION_ADAPT_STRUCT(JAWSFunction, (std::wstring, FunctionType)(std::wstring, Description)(std::wstring, Synopsis)(std::wstring, ReturnType)(std::vector<std::pair<std::wstring, std::wstring> >, Parameters)) If I compile this with the std::vector<std::pair<std::wstring, std::wstring> > taken out, this works fine. However replacing the vector of pairs doesn't compile. How can I get this to work? Any help appreciated. Cheers Sean.

2 2

boost::units us system
by Michael Powell 25 Jul '11

25 Jul '11

Boost::units users, I am looking for a system which gathers the U.S. units of measure. I notice, for instance, that SI has a system. Are there any plans in the works to introduce a US system? If not, how hard would that be? There are base units, for instance. So it would be a matter of setting up the appropriate systems? **or** what approach have boost::units users taken in the past when broaching the US-SI unit conversion question? Thank you... Regards, Michael

1 0

boost::units unit proposal
by Michael Powell 25 Jul '11

25 Jul '11

Boost::units developers / users, I need to specify a U.S. Barrel (bbl) for purposes of performing conversions and so forth. First, does this definition look about right? Second, how does one propose an addition to the units code base? Note, I'm not quite sure how the 2^3 scaling from gallon to pints works in terms of scaling from barrel to gallons, or pints for that matter, so I am assuming that gallon can be the base unit for barrel and call it good. Thoughts, questions, concerns? namespace us { typedef scaled_base_unit<gallon_base_unit, scale<42> > barrel_base_unit; } // namespace us template<> struct base_unit_info<us::barrel_base_unit> { static const char* name() { return("bbl (U.S.)"); } static const char* symbol() { return("bbl"); } }; Thank you... Regards, Michael

1 0

url encoding
by Kraus Philipp 25 Jul '11

25 Jul '11

Hello, does boost support any url encoding structures? I would like to transform a std::string with spaces and other chars to the correct url representation (space will be changed to %20 ...). Thanks Phil

3 2

is leaf() be defined at boost/filesystem/operations.hpp ?
by Eric Lin 24 Jul '11

24 Jul '11

Dear advanced boost/c/g++ programers: I copied and try a simple (Reading a directory with boost) program , from page 383, Example 10-19, of book(C++ cookbook) ----------you can download the code to try by yourself at, http://examples.oreilly.com/9780596007614/ // Example 10-19. Reading a directory #include <iostream> #include <cstdlib> #include <boost/filesystem/operations.hpp> #include <boost/filesystem/fstream.hpp> using namespace boost::filesystem; int main(int argc, char** argv) { if (argc < 2) { std::cerr << "Usage: " << argv[0] << " [dir name]\n"; return(EXIT_FAILURE); } path fullPath = // Create the full, absolute path name system_complete(path(argv[1])); if (!exists(fullPath)) { std::cerr << "Error: the directory " << fullPath.string() << " does not exist.\n"; return(EXIT_FAILURE); } if (!is_directory(fullPath)) { std::cout << fullPath.string() << " is not a directory!\n"; return(EXIT_SUCCESS); } directory_iterator end; for (directory_iterator it(fullPath); it != end; ++it) { // Iterate through each // element in the dir, std::cout << it->leaf(); // almost as you would if (is_directory(*it)) // an STL container std::cout << " (dir)"; std::cout << '\n'; } return(EXIT_SUCCESS); } ----------------------------------------------------------------------------- my compiler g++ 4.5.2 not pass it, even I link --------- eric@eric-laptop:~/cppcookbook/ch10$ g++ -lboost_system -lboost_filesystem Example10-19.cpp Example10-19.cpp: In function ‘int main(int, char**)’: Example10-19.cpp:34:24: error: ‘class boost::filesystem3::directory_entry’ has no member named ‘leaf’ eric@eric-laptop:~/cppcookbook/ch10$ --------- I am using 1.46.1 of boost looking to hear from your help and thanks a lot in advance, Eric

3 3

Boost.Iterator questions
by John M. Dlugosz 24 Jul '11

24 Jul '11

Consider something similar to what Glib::ustring does, only better made. If I have a sequence of characters (say, in a normal std::string) and want to use an adaptor to decode UTF-8 code points, the resulting adapted iterator returns a different type (element is char32_t), not an lvalue, and consumes a variable number of underlying elements. It's not just a transform_iterator because it consumes a variable number of underlying elements. It's not writable because a new value might encode a different number of underlying elements than the one it is replacing. I think I need to implement it directly from iterator_facade, not one of the more specialized classes already provided. Am I mistaken? What is the traversal type? Random access is _possible_ just not efficient. To move forward n locations it has to increment n times. ++ and −− are fine. There is indeed a well defined distance between two iterators, but I don't want to encourage that kind of thing and hide the inefficiency. But, I see that relational operators are defined for random access (only), not for bidirectional? Why is that? Note that relational operators for the proposed type _are_ efficient, as it can defer to the underlying iterator. I knows which is greater, just not by how much exactly. The template argument for Difference, in the tutorial, mentions "distance between any two addresses in memory". But the distance between two locations is not the same as the difference in bytes. Is this being implied? After all, the example is a linked list and the distance from one node to another, in hops, has no relation to the address at all. Is Difference something I need to worry about?

2 2

[iterator] iterator_core_access and namespaces
by Nathan Ridge 24 Jul '11

24 Jul '11

Hello, I came across what seems like an interesting oddity: #include <boost/iterator/iterator_facade.hpp> using boost::iterator_core_access; namespace ns { struct range { class iterator : public boost::iterator_facade<iterator, int, boost::single_pass_traversal_tag> { friend class iterator_core_access; int& dereference() const; void increment(); bool equal(const iterator& other) const; }; typedef iterator iterator; iterator begin(); iterator end(); }; } int main() { ns::range::iterator b; ++b; } This code goes not compile with gcc (I tried with 4.3 through 4.7), giving the following error: test.cpp: In static member function 'static void boost::iterator_core_access::increment(Facade&) [with Facade = ns::range::iterator]': boost/boost/iterator/iterator_facade.hpp:664:11: instantiated from 'Derived& boost::iterator_facade<I, V, TC, R, D>::operator++() [with Derived = ns::range::iterator, Value = int, CategoryOrTraversal = boost::single_pass_traversal_tag, Reference = int&, Difference = int]' test.cpp:29:7: instantiated from here test.cpp:16:18: error: 'void ns::range::iterator::increment()' is private boost/boost/iterator/iterator_facade.hpp:523:11: error: within this context If I explicitly qualify iterator_core_access in the friend declaration (i.e. "friend class boost::iterator_core_access"), or if I move the "using boost::iterator_core_access" inside the namespace, it works fine. Is this a compiler bug, or am I bumping into a shadowy corner of the Standard involving friends and namespaces? Thanks, Nate.

1 0

Fwd: boost.thread build error when use mingw32 based on gcc-4.6.1-release
by niXman 23 Jul '11

23 Jul '11

---------- Forwarded message ---------- From: niXman <i.nixman(a)gmail.com> Date: 2011/7/24 Subject: boost.thread build error when use mingw32 based on gcc-4.6.1-release To: boost-users(a)lists.boost.org Hi all! When I build boost-1.46.1 or boost-1.47.0 I get the following errors: > common.mkdir bin.v2\libs\thread > > common.mkdir bin.v2\libs\thread\build > > common.mkdir bin.v2\libs\thread\build\gcc-mingw-4.6.1 > > common.mkdir bin.v2\libs\thread\build\gcc-mingw-4.6.1\release > > common.mkdir bin.v2\libs\thread\build\gcc-mingw-4.6.1\release\link-static > > common.mkdir >> bin.v2\libs\thread\build\gcc-mingw-4.6.1\release\link-static\runtim > > e-link-static > > common.mkdir >> bin.v2\libs\thread\build\gcc-mingw-4.6.1\release\link-static\runtim > > e-link-static\threading-multi > > common.mkdir >> bin.v2\libs\thread\build\gcc-mingw-4.6.1\release\link-static\runtim > > e-link-static\threading-multi\win32 > > gcc.compile.c++ >> bin.v2\libs\thread\build\gcc-mingw-4.6.1\release\link-static\run > > time-link-static\threading-multi\win32\thread.o > > In file included from ./boost/thread/detail/platform.hpp:17:0, > > from ./boost/thread/thread.hpp:12, > > from libs\thread\src\win32\thread.cpp:10: > > ./boost/config/requires_threads.hpp:29:4: error: #error "Threading support >> unava > > liable: it has been explicitly disabled with BOOST_DISABLE_THREADS" > > libs\thread\src\win32\thread.cpp: In function 'void >> boost::{anonymous}::create_c > > urrent_thread_tls_key()': > > libs\thread\src\win32\thread.cpp:33:37: error: 'tss_cleanup_implemented' >> was not > > declared in this scope > > In file included from ./boost/thread/shared_mutex.hpp:14:0, > > from ./boost/thread/detail/thread_group.hpp:9, > > from ./boost/thread/thread.hpp:24, > > from libs\thread\src\win32\thread.cpp:10: > > ./boost/thread/win32/shared_mutex.hpp: In member function 'T >> boost::shared_mutex > > ::interlocked_compare_exchange(T*, T, T) [with T = >> boost::shared_mutex::state_da > > ta]': > > ./boost/thread/win32/shared_mutex.hpp:110:103: instantiated from here > > ./boost/thread/win32/shared_mutex.hpp:50:99: warning: dereferencing >> type-punned > > pointer will break strict-aliasing rules [-Wstrict-aliasing] > > ./boost/thread/win32/shared_mutex.hpp:50:99: warning: dereferencing >> type-punned > > pointer will break strict-aliasing rules [-Wstrict-aliasing] > > ./boost/thread/win32/shared_mutex.hpp:51:52: warning: dereferencing >> type-punned > > pointer will break strict-aliasing rules [-Wstrict-aliasing] > > ./boost/thread/win32/shared_mutex.hpp:51:52: warning: dereferencing >> type-punned > > pointer will break strict-aliasing rules [-Wstrict-aliasing] > > >> "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall >> -mthrea > > ds -Wno-long-long -DBOOST_ALL_NO_LIB=1 -DBOOST_THREAD_BUILD_LIB=1 -DNDEBUG >> -I". > > " -c -o >> "bin.v2\libs\thread\build\gcc-mingw-4.6.1\release\link-static\runtime-li > > nk-static\threading-multi\win32\thread.o" >> "libs\thread\src\win32\thread.cpp" > > >> ...failed gcc.compile.c++ >> bin.v2\libs\thread\build\gcc-mingw-4.6.1\release\link- > > static\runtime-link-static\threading-multi\win32\thread.o... > > gcc.compile.c++ >> bin.v2\libs\thread\build\gcc-mingw-4.6.1\release\link-static\run > > time-link-static\threading-multi\win32\tss_dll.o > > In file included from ./boost/thread/detail/platform.hpp:17:0, > > from ./boost/thread/detail/config.hpp:20, > > from libs\thread\src\win32\tss_dll.cpp:6: > > ./boost/config/requires_threads.hpp:29:4: error: #error "Threading support >> unava > > liable: it has been explicitly disabled with BOOST_DISABLE_THREADS" > > >> "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall >> -mthrea > > ds -Wno-long-long -DBOOST_ALL_NO_LIB=1 -DBOOST_THREAD_BUILD_LIB=1 -DNDEBUG >> -I". > > " -c -o >> "bin.v2\libs\thread\build\gcc-mingw-4.6.1\release\link-static\runtime-li > > nk-static\threading-multi\win32\tss_dll.o" >> "libs\thread\src\win32\tss_dll.cpp" > > >> ...failed gcc.compile.c++ >> bin.v2\libs\thread\build\gcc-mingw-4.6.1\release\link- > > static\runtime-link-static\threading-multi\win32\tss_dll.o... > > gcc.compile.c++ >> bin.v2\libs\thread\build\gcc-mingw-4.6.1\release\link-static\run > > time-link-static\threading-multi\win32\tss_pe.o > > In file included from ./boost/thread/detail/platform.hpp:17:0, > > from ./boost/thread/detail/config.hpp:20, > > from libs\thread\src\win32\tss_pe.cpp:10: > > ./boost/config/requires_threads.hpp:29:4: error: #error "Threading support >> unava > > liable: it has been explicitly disabled with BOOST_DISABLE_THREADS" > > >> "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall >> -mthrea > > ds -Wno-long-long -DBOOST_ALL_NO_LIB=1 -DBOOST_THREAD_BUILD_LIB=1 -DNDEBUG >> -I". > > " -c -o >> "bin.v2\libs\thread\build\gcc-mingw-4.6.1\release\link-static\runtime-li > > nk-static\threading-multi\win32\tss_pe.o" >> "libs\thread\src\win32\tss_pe.cpp" > > >> ...failed gcc.compile.c++ >> bin.v2\libs\thread\build\gcc-mingw-4.6.1\release\link- > > static\runtime-link-static\threading-multi\win32\tss_pe.o... > > ...skipped >> <pbin.v2\libs\thread\build\gcc-mingw-4.6.1\release\link-static\runtim > > e-link-static\threading-multi>libboost_thread.a(clean) for lack of >> <pbin.v2\libs > > >> \thread\build\gcc-mingw-4.6.1\release\link-static\runtime-link-static\threading- > > multi>win32\thread.o... > > ...skipped >> <pbin.v2\libs\thread\build\gcc-mingw-4.6.1\release\link-static\runtim > > e-link-static\threading-multi>libboost_thread.a for lack of >> <pbin.v2\libs\thread > > >> \build\gcc-mingw-4.6.1\release\link-static\runtime-link-static\threading-multi>w > > in32\thread.o... > > ...skipped <pc:\mingw\i686-pc-mingw32\lib>libboost_thread.a for lack of >> <pbin.v2 > > >> \libs\thread\build\gcc-mingw-4.6.1\release\link-static\runtime-link-static\threa > > ding-multi>libboost_thread.a... > > mingw is builded by myself. configured with: > C:\>g++ -v > > Using built-in specs. > > COLLECT_GCC=g++ > > >> COLLECT_LTO_WRAPPER=c:/mingw/bin/../libexec/gcc/i686-pc-mingw32/4.6.1/lto-wrappe > > r.exe > > Target: i686-pc-mingw32 > > Configured with: /c/mingw-builder/src/gcc/configure --host=i686-pc-mingw32 >> --bui > > ld=i686-linux-gnu --target=i686-pc-mingw32 >> --with-sysroot=/c/mingw-builder/mingw > > 32-4.6.1-release-rev-2/mingw32-4.6.1-release-rev-2 >> --prefix=/c/mingw-builder/min > > gw32-4.6.1-release-rev-2/mingw32-4.6.1-release-rev-2 >> --with-libiconv-prefix=/c/m > > ingw-builder/mingw32-4.6.1-release-rev-2/libs >> --with-libexpat-prefix=/c/mingw-bu > > ilder/mingw32-4.6.1-release-rev-2/libs >> --with-gmp=/c/mingw-builder/mingw32-4.6.1 > > -release-rev-2/libs >> --with-mpfr=/c/mingw-builder/mingw32-4.6.1-release-rev-2/lib > > s --with-mpc=/c/mingw-builder/mingw32-4.6.1-release-rev-2/libs >> --with-ppl=/c/min > > gw-builder/mingw32-4.6.1-release-rev-2/libs >> --with-cloog=/c/mingw-builder/mingw3 > > 2-4.6.1-release-rev-2/libs --enable-cloog-backend=isl >> --with-host-libstdcxx=-lst > > dc++ --enable-threads=posix --enable-static --disable-shared >> --enable-languages= > > c,c++ --enable-libgomp --enable-checking=release >> --enable-fully-dynamic-string - > > -enable-sjlj-exceptions --enable-libstdcxx-debug --disable-nls >> --disable-werror > > --enable-lto --disable-multilib --disable-win32-registry --disable-rpath >> --disab > > le-werror CFLAGS='-O2 -mtune=core2 -fomit-frame-pointer >> -momit-leaf-frame-pointe > > r -fgraphite-identity -floop-interchange -floop-block >> -floop-parallelize-all' LD > > FLAGS=' -lpthread' > > Thread model: posix > > gcc version 4.6.1 (GCC) > > Any ideas? Thanks.

1 0

Trying to use Boost::thread
by Allan Nielsen 23 Jul '11

23 Jul '11

Hi, I am trying to use boost::thread to copy data from one stream to another. For this I have written the following code, but can can not compile it and I do not under stand why... Is there an better way to do this? -- Allan #include <fstream> #include <iostream> #include "Poco/Net/HTTPClientSession.h" #include "Poco/Net/HTTPRequest.h" #include "Poco/Net/HTTPResponse.h" #include "Poco/StreamCopier.h" #include "Poco/Path.h" #include "Poco/URI.h" #include <boost/thread.hpp> using namespace std; using namespace Poco; using namespace Poco::Net; struct Test { Test (const std::string & s_url) : uri(s_url), path(uri.getPathAndQuery()), session(uri.getHost(), uri.getPort()) { if (path.empty()) path = "/"; HTTPRequest req(HTTPRequest::HTTP_GET, path, HTTPMessage::HTTP_1_1); session.sendRequest(req); // Compiler error // boost::thread(boost::ref(*this)); // this compiles boost::packaged_task<int> pt(boost::ref(*this)); boost::unique_future<int> fi=pt.get_future(); boost::thread task(boost::move(pt)); } int operator()() { ofstream null("/dev/null"); std::istream& rs = session.receiveResponse(res); StreamCopier::copyStream(rs, null); } URI uri; std::string path; HTTPClientSession session; HTTPResponse res; }; int main(int argc, const char *argv[]) { Test test("http://localhost/gmbfs"); // TODO, sync return 0; }

2 1

Use Boost thread and store results of function into object's local variable.
by Damian 23 Jul '11

23 Jul '11

Hello. I'm a new to Boost and the listserv so please forgive my ignorance if my question is obvious. I have found the Boost documentation and example difficult to use for my needs (perhaps I'm just not using the correct packages). I have a vector of objects each of which needs to do so calculations. Each vector element can run independently and doesn't rely on anything other than its own private variables. I'd like to launch N threads (where N can vary from 1...8 let's say) and pass to each thread 1 element of the vector. Within the threads, each object crunches its numbers and stores its result in its local variable. I've got some code here but it won't compile. I get this error message: "cannot call member function ‘void PSMClass::process()’ without object" I think the problem is that I'm not passing the vector element itself but rather a pointer to it (?). Perhaps this isn't the best approach, I don't know. Can anyone help me out? Thanks in advance for any and all help. ################################################################ #include <iostream> #include <vector> #include <cstdlib> #include <boost/thread.hpp> #include <boost/bind.hpp> using namespace std; class PSMClass; class PSMClass { private: int id; double x; double y; public: PSMClass(){}; // default ctor PSMClass(int i, double a); // constructor void process(); int getId() { return id; } double getX(){ return x; } double getY(){ return y; } void innerFunc(double r); }; PSMClass::PSMClass(int i, double a) { id = i; x = a; y = 0; } // just some function that we want to run in parallel void PSMClass::process() { double r = 0; double odd = 0; int STOP = id * 10000000; for(int i = 0; i < STOP; i++) { r += 1; // this is just some random code I through in to make the process // CPU-intensive yet slow enough for me to monitor it on 'top' odd = (double)rand() * sin( (double)rand() ); } innerFunc(r); odd = 0; } // just another function to obfuscate matters void PSMClass::innerFunc(double r) { y = r; } /******************************************************************************* * * Main Function * ******************************************************************************/ int main(int argc, char* argv[]) { PSMClass *curPSM = NULL; vector<PSMClass> PSM_vec; vector<PSMClass>::iterator v; double r; int N = 10; for(int i = 0; i < N; i++) { r = (double) (rand() % N + 1000); curPSM = new PSMClass(i, r); PSM_vec.push_back(*curPSM); delete(curPSM); curPSM = NULL; } cout << "Initial states:\n"; cout << "id\tx\ty\n"; for(v = PSM_vec.begin(); v != PSM_vec.end(); v++) { cout << v->getId() << "\t" << v->getX() << "\t" << v->getY() << endl; } cout << endl; // we want to limit TG to just 2 threads. In the final program the user // will give as input at the command line how many threads the program // should use. int NUM_THREADS = 2; boost::thread_group *TG = NULL; TG = new boost::thread_group; for(v = PSM_vec.begin(); v != PSM_vec.end(); v++) { TG->create_thread( boost::bind( &PSMClass::process(), boost::ref(*v) ) ); if( (signed)TG->size() == NUM_THREADS ) { TG->join_all(); // destroy all the threads you created delete(TG); TG = NULL; TG = new boost::thread_group; } } cout << endl; TG->join_all(); // collect the remaining threads together delete(TG); TG = NULL; // At this point v->getY() should return the value that was computed // within the threads. cout << "Final states:\n"; cout << "id\tx\ty\n"; for(v = PSM_vec.begin(); v != PSM_vec.end(); v++) { cout << v->getId() << "\t" << v->getX() << "\t" << v->getY() << endl; } cout << endl; return 0; } ################################################################

2 1

Re: [Boost-users] [context] MinGW support?
by Nathan Ridge 23 Jul '11

23 Jul '11

> Hello, > > I would like to play around with the (provisionally accepted) Boost.Context > library, and I'm wondering: does it support MinGW? > > First, I should mention, I am using the source from > http://ok73.ok.funpic.de/boost.context-0.7.4.zip, but I'm not sure > whether this is the latest version - the link to the source at > http://www.boost.org/community/review_schedule.html is broken > (it points to the Boost Vault, which is down, and I can't find it at > https://github.com/boost-vault) > > I tried to compile it both in 64-bit mode using: > > toolset=gcc architecture=x86 instruction-set=yorksfield address-model=64 > > and in 32-bit mode using: > > toolset=gcc architecture=x86 instruction-set=i686 address-model=32 > > but in both cases I get errors (pasted below). > > Am I doing something wrong, or does this library not support MinGW? > If the latter, is MinGW support planned at some point? I'm also having problems compiling it on Linux with: toolset=gcc architecture=x86 instruction-set=i686 address-model=32 I get the following errors: gcc.compile.c++ bin.v2/libs/context/build/gcc-4.6.1/release/address-model-32/architecture-x86/instruction-set-i686/link-static/protected_stack_posix.o libs/context/src/protected_stack_posix.cpp: In constructor 'boost::contexts::protected_stack::protected_stack(std::size_t)': libs/context/src/protected_stack_posix.cpp:61:15: warning: unused variable 'result' [-Wunused-variable] libs/context/src/protected_stack_posix.cpp: At global scope: libs/context/src/protected_stack_posix.cpp:76:1: error: prototype for 'boost::contexts::protected_stack::protected_stack(boost::rv<boost::contexts::protected_stack>&)' does not match any in class 'boost::contexts::protected_stack' ./boost/context/protected_stack.hpp:44:5: error: candidates are: boost::contexts::protected_stack::protected_stack(boost::rv<boost::contexts::protected_stack>&) libs/context/src/protected_stack_posix.cpp:38:1: error: boost::contexts::protected_stack::protected_stack(std::size_t) libs/context/src/protected_stack_posix.cpp:34:1: error: boost::contexts::protected_stack::protected_stack() ./boost/context/protected_stack.hpp:27:5: error: boost::contexts::protected_stack::protected_stack(boost::contexts::protected_stack&) libs/context/src/protected_stack_posix.cpp:81:1: error: prototype for 'boost::contexts::protected_stack& boost::contexts::protected_stack::operator=(boost::rv<boost::contexts::protected_stack>&)' does not match any in class 'boost::contexts::protected_stack' ./boost/context/protected_stack.hpp:46:23: error: candidates are: boost::contexts::protected_stack& boost::contexts::protected_stack::operator=(boost::rv<boost::contexts::protected_stack>&) ./boost/context/protected_stack.hpp:27:5: error: boost::contexts::protected_stack& boost::contexts::protected_stack::operator=(boost::contexts::protected_stack&) "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -march=i686 -m32 -DBOOST_ALL_NO_LIB=1 -DNDEBUG -I"." -c -o "bin.v2/libs/context/build/gcc-4.6.1/release/address-model-32/architecture-x86/instruction-set-i686/link-static/protected_stack_posix.o" "libs/context/src/protected_stack_posix.cpp" ...failed gcc.compile.c++ bin.v2/libs/context/build/gcc-4.6.1/release/address-model-32/architecture-x86/instruction-set-i686/link-static/protected_stack_posix.o... common.mkdir bin.v2/libs/context/build/gcc-4.6.1/release/address-model-32/architecture-x86/instruction-set-i686/link-static/asm gcc.compile.asm bin.v2/libs/context/build/gcc-4.6.1/release/address-model-32/architecture-x86/instruction-set-i686/link-static/asm/fcontext_i386_sysv_elf_gas.o gcc.compile.c++ bin.v2/libs/context/build/gcc-4.6.1/release/address-model-32/architecture-x86/instruction-set-i686/link-static/stack_helper_posix.o libs/context/src/stack_helper_posix.cpp: In function 'rlimit {anonymous}::stacksize_limit_()': libs/context/src/stack_helper_posix.cpp:27:15: warning: unused variable 'result' [-Wunused-variable] ...skipped <pbin.v2/libs/context/build/gcc-4.6.1/release/address-model-32/architecture-x86/instruction-set-i686/link-static>libboost_context.a(clean) for lack of <pbin.v2/libs/context/build/gcc-4.6.1/release/address-model-32/architecture-x86/instruction-set-i686/link-static>protected_stack_posix.o... ...skipped <pbin.v2/libs/context/build/gcc-4.6.1/release/address-model-32/architecture-x86/instruction-set-i686/link-static>libboost_context.a for lack of <pbin.v2/libs/context/build/gcc-4.6.1/release/address-model-32/architecture-x86/instruction-set-i686/link-static>protected_stack_posix.o... ...skipped <pstage/lib>libboost_context.a for lack of <pbin.v2/libs/context/build/gcc-4.6.1/release/address-model-32/architecture-x86/instruction-set-i686/link-static>libboost_context.a... ...failed updating 1 target... ...skipped 3 targets... ...updated 11 targets... What am I doing wrong? Thanks, Nate.

1 0

FW: [context] MinGW support?
by Nathan Ridge 23 Jul '11

23 Jul '11

---------------------------------------- > From: zeratul976(a)hotmail.com > To: boost(a)lists.boost.org; boost-users-bounces(a)lists.boost.org > Subject: [context] MinGW support? > Date: Sat, 23 Jul 2011 05:47:36 +0000 > > > Hello, > > I would like to play around with the (provisionally accepted) Boost.Context > library, and I'm wondering: does it support MinGW? > > First, I should mention, I am using the source from > http://ok73.ok.funpic.de/boost.context-0.7.4.zip, but I'm not sure > whether this is the latest version - the link to the source at > http://www.boost.org/community/review_schedule.html is broken > (it points to the Boost Vault, which is down, and I can't find it at > https://github.com/boost-vault) > > I tried to compile it both in 64-bit mode using: > > toolset=gcc architecture=x86 instruction-set=yorksfield address-model=64 > > and in 32-bit mode using: > > toolset=gcc architecture=x86 instruction-set=i686 address-model=32 > > but in both cases I get errors (pasted below). > > Am I doing something wrong, or does this library not support MinGW? > If the latter, is MinGW support planned at some point? > > Thanks, > Nate > > 64-bit errors: > > gcc.compile.c++ bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-64\architecture-x86\instruction-set-york > sfield\link-static\protected_stack_windows.o > libs\context\src\protected_stack_windows.cpp:1:0: sorry, unimplemented: 64-bit mode not compiled in > "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -m64 -DBOOST_ALL_NO_LIB=1 -DNDEBUG -I"." -c - > o "bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-64\architecture-x86\instruction-set-yorksfield\link-s > tatic\protected_stack_windows.o" "libs\context\src\protected_stack_windows.cpp" > ...failed gcc.compile.c++ bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-64\architecture-x86\instructio > n-set-yorksfield\link-static\protected_stack_windows.o... > common.mkdir bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-64\architecture-x86\instruction-set-yorksfi > eld\link-static\asm > gcc.compile.asm bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-64\architecture-x86\instruction-set-york > sfield\link-static\asm\fcontext_x86_64_ms_pe_masm.o > libs\context\src\asm\fcontext_x86_64_ms_pe_masm.asm:1:0: sorry, unimplemented: 64-bit mode not compiled in > "g++" -x assembler-with-cpp -O3 -finline-functions -Wno-inline -Wall -m64 -DBOOST_ALL_NO_LIB=1 -DNDEBUG -I"." -c -o > "bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-64\architecture-x86\instruction-set-yorksfield\link-sta > tic\asm\fcontext_x86_64_ms_pe_masm.o" "libs\context\src\asm\fcontext_x86_64_ms_pe_masm.asm" > ...failed gcc.compile.asm bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-64\architecture-x86\instructio > n-set-yorksfield\link-static\asm\fcontext_x86_64_ms_pe_masm.o... > gcc.compile.c++ bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-64\architecture-x86\instruction-set-york > sfield\link-static\stack_helper_windows.o > libs\context\src\stack_helper_windows.cpp:1:0: sorry, unimplemented: 64-bit mode not compiled in > "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -m64 -DBOOST_ALL_NO_LIB=1 -DNDEBUG -I"." -c - > o "bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-64\architecture-x86\instruction-set-yorksfield\link-s > tatic\stack_helper_windows.o" "libs\context\src\stack_helper_windows.cpp" > ...failed gcc.compile.c++ bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-64\architecture-x86\instructio > n-set-yorksfield\link-static\stack_helper_windows.o... > gcc.compile.c++ bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-64\architecture-x86\instruction-set-york > sfield\link-static\seh.o > libs\context\src\seh.cpp:1:0: sorry, unimplemented: 64-bit mode not compiled in > "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -m64 -DBOOST_ALL_NO_LIB=1 -DNDEBUG -I"." -c - > o "bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-64\architecture-x86\instruction-set-yorksfield\link-s > tatic\seh.o" "libs\context\src\seh.cpp" > ...failed gcc.compile.c++ bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-64\architecture-x86\instructio > n-set-yorksfield\link-static\seh.o... > ...skipped <pbin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-64\architecture-x86\instruction-set-yorksfi > eld\link-static>libboost_context-mgw46-1_46_1.a(clean) for lack of <pbin.v2\libs\context\build\gcc-mingw-4.6.0\release\a > ddress-model-64\architecture-x86\instruction-set-yorksfield\link-static>protected_stack_windows.o... > ...skipped <pbin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-64\architecture-x86\instruction-set-yorksfi > eld\link-static>libboost_context-mgw46-1_46_1.a for lack of <pbin.v2\libs\context\build\gcc-mingw-4.6.0\release\address- > model-64\architecture-x86\instruction-set-yorksfield\link-static>protected_stack_windows.o... > ...skipped <pstage\lib>libboost_context-mgw46-1_46_1.a for lack of <pbin.v2\libs\context\build\gcc-mingw-4.6.0\release\a > ddress-model-64\architecture-x86\instruction-set-yorksfield\link-static>libboost_context-mgw46-1_46_1.a... > ...failed updating 4 targets... > ...skipped 3 targets... > ...updated 9 targets... > > > 32-bit errors: > > cc.compile.c++ bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-32\architecture-x86\instruction-set-i686 > link-static\protected_stack_windows.o > ibs\context\src\protected_stack_windows.cpp: In constructor 'boost::contexts::protected_stack::protected_stack(std::siz > _t)': > ibs\context\src\protected_stack_windows.cpp:60:16: warning: unused variable 'result' [-Wunused-variable] > ommon.mkdir bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-32\architecture-x86\instruction-set-i686\li > k-static\asm > cc.compile.asm bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-32\architecture-x86\instruction-set-i686 > link-static\asm\fcontext_i386_ms_pe_masm.o > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm: Assembler messages: > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:2: Error: no such instruction: `copyright Oliver Kowalke 2009.' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:3: Error: no such instruction: `distributed under the Boost Software L > cense,Version 1.0.' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:4: Error: junk at end of line, first unrecognized character is `(' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:7: Error: junk at end of line, first unrecognized character is `-' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:8: Error: junk at end of line, first unrecognized character is `|' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:9: Error: junk at end of line, first unrecognized character is `-' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:10: Error: junk at end of line, first unrecognized character is `|' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:11: Error: junk at end of line, first unrecognized character is `-' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:12: Error: junk at end of line, first unrecognized character is `|' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:13: Error: junk at end of line, first unrecognized character is `-' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:14: Error: junk at end of line, first unrecognized character is `-' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:15: Error: junk at end of line, first unrecognized character is `|' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:16: Error: junk at end of line, first unrecognized character is `-' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:17: Error: junk at end of line, first unrecognized character is `|' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:18: Error: junk at end of line, first unrecognized character is `-' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:19: Error: junk at end of line, first unrecognized character is `|' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:20: Error: junk at end of line, first unrecognized character is `-' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:21: Error: junk at end of line, first unrecognized character is `-' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:22: Error: junk at end of line, first unrecognized character is `|' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:23: Error: junk at end of line, first unrecognized character is `-' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:24: Error: junk at end of line, first unrecognized character is `|' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:25: Error: junk at end of line, first unrecognized character is `-' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:26: Error: junk at end of line, first unrecognized character is `|' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:27: Error: junk at end of line, first unrecognized character is `-' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:29: Error: unknown pseudo-op: `.386' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:30: Error: unknown pseudo-op: `.xmm' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:31: Error: unknown pseudo-op: `.model' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:32: Error: no such instruction: `_exit PROTO,value:SDWORD' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:33: Error: no such instruction: `boost_fcontext_seh PROTO,except:DWORD > frame:DWORD,context:DWORD,dispatch:DWORD' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:34: Error: unknown pseudo-op: `.code' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:36: Error: no such instruction: `boost_fcontext_jump PROC EXPORT' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:37: Error: invalid char '[' beginning operand 2 `[esp+04h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:37: Error: no such instruction: `load address of the first fcontext_t > rg' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:38: Error: invalid char '[' beginning operand 1 `[eax]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:38: Error: no such instruction: `save EDI' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:39: Error: invalid char '[' beginning operand 1 `[eax+04h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:39: Error: no such instruction: `save ESI' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:40: Error: invalid char '[' beginning operand 1 `[eax+08h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:40: Error: no such instruction: `save EBX' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:41: Error: invalid char '[' beginning operand 1 `[eax+0ch]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:41: Error: no such instruction: `save EBP' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:43: Error: no such instruction: `assume fs:nothing' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:44: Error: too many memory references for `mov' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:44: Error: no such instruction: `load NT_TIB' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:45: Error: no such instruction: `assume fs:error' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:46: Error: invalid char '[' beginning operand 2 `[edx]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:46: Error: no such instruction: `load current SEH exception list' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:47: Error: invalid char '[' beginning operand 1 `[eax+02ch]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:47: Error: no such instruction: `save current exception list' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:48: Error: invalid char '[' beginning operand 2 `[edx+04h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:48: Error: no such instruction: `load current stack base' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:49: Error: invalid char '[' beginning operand 1 `[eax+020h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:49: Error: no such instruction: `save current stack base' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:50: Error: invalid char '[' beginning operand 2 `[edx+08h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:50: Error: no such instruction: `load current stack limit' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:51: Error: invalid char '[' beginning operand 1 `[eax+024h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:51: Error: no such instruction: `save current stack limit' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:52: Error: invalid char '[' beginning operand 2 `[edx+010h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:52: Error: no such instruction: `load fiber local storage' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:53: Error: invalid char '[' beginning operand 1 `[eax+030h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:53: Error: no such instruction: `save fiber local storage' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:55: Error: invalid char '[' beginning operand 1 `[eax+018h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:55: Error: no such instruction: `save SSE2 control word' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:56: Error: invalid char '[' beginning operand 1 `[eax+01ch]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:56: Error: no such instruction: `save x87 control word' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:58: Error: invalid char '[' beginning operand 2 `[esp+04h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:58: Error: no such instruction: `exclude the return address' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:59: Error: invalid char '[' beginning operand 1 `[eax+010h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:59: Error: no such instruction: `save as stack pointer' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:60: Error: invalid char '[' beginning operand 2 `[esp]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:60: Error: no such instruction: `load return address' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:61: Error: invalid char '[' beginning operand 1 `[eax+014h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:61: Error: no such instruction: `save return address' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:64: Error: invalid char '[' beginning operand 2 `[esp+08h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:64: Error: no such instruction: `load address of the second fcontext_t > arg' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:65: Error: invalid char '[' beginning operand 2 `[eax]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:65: Error: no such instruction: `restore EDI' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:66: Error: invalid char '[' beginning operand 2 `[eax+04h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:66: Error: no such instruction: `restore ESI' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:67: Error: invalid char '[' beginning operand 2 `[eax+08h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:67: Error: no such instruction: `restore EBX' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:68: Error: invalid char '[' beginning operand 2 `[eax+0ch]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:68: Error: no such instruction: `restore EBP' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:70: Error: no such instruction: `assume fs:nothing' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:71: Error: too many memory references for `mov' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:71: Error: no such instruction: `load NT_TIB' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:72: Error: no such instruction: `assume fs:error' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:73: Error: invalid char '[' beginning operand 2 `[eax+02ch]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:73: Error: no such instruction: `load SEH exception list' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:74: Error: invalid char '[' beginning operand 1 `[edx]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:74: Error: no such instruction: `restore next SEH item' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:75: Error: invalid char '[' beginning operand 2 `[eax+020h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:75: Error: no such instruction: `load stack base' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:76: Error: invalid char '[' beginning operand 1 `[edx+04h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:76: Error: no such instruction: `restore stack base' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:77: Error: invalid char '[' beginning operand 2 `[eax+024h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:77: Error: no such instruction: `load stack limit' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:78: Error: invalid char '[' beginning operand 1 `[edx+08h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:78: Error: no such instruction: `restore stack limit' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:79: Error: invalid char '[' beginning operand 2 `[eax+030h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:79: Error: no such instruction: `load fiber local storage' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:80: Error: invalid char '[' beginning operand 1 `[edx+010h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:80: Error: no such instruction: `restore fiber local storage' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:82: Error: invalid char '[' beginning operand 1 `[eax+018h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:82: Error: no such instruction: `restore SSE2 control word' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:83: Error: invalid char '[' beginning operand 1 `[eax+01ch]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:83: Error: no such instruction: `restore x87 control word' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:85: Error: invalid char '[' beginning operand 2 `[eax+010h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:85: Error: no such instruction: `restore ESP' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:86: Error: invalid char '[' beginning operand 2 `[eax+014h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:86: Error: no such instruction: `fetch the address to return to' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:88: Error: too many memory references for `xor' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:88: Error: no such instruction: `set EAX to zero' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:89: Error: no such instruction: `indirect jump to context' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:90: Error: no such instruction: `boost_fcontext_jump ENDP' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:92: Error: no such instruction: `boost_fcontext_make PROC EXPORT' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:93: Error: invalid char '[' beginning operand 2 `[esp+04h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:93: Error: no such instruction: `load address of the fcontext_t arg0' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:94: Error: invalid char '[' beginning operand 1 `[eax]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:94: Error: no such instruction: `save the address of current context' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:95: Error: invalid char '[' beginning operand 2 `[esp+08h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:95: Error: no such instruction: `load the address of the function supp > sed to run' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:96: Error: invalid char '[' beginning operand 1 `[eax+014h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:96: Error: no such instruction: `save the address of the function supp > sed to run' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:97: Error: invalid char '[' beginning operand 2 `[eax+020h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:97: Error: no such instruction: `load the stack base' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:98: Error: invalid char '[' beginning operand 2 `[edx-014h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:98: Error: no such instruction: `reserve space for last frame on stack > (ESP+4)% 16==0' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:99: Error: invalid char '[' beginning operand 1 `[eax+010h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:99: Error: no such instruction: `save the address' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:101: Error: too many memory references for `mov' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:101: Error: no such instruction: `set ECX to exception-handler' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:102: Error: invalid char '[' beginning operand 1 `[edx+0ch]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:102: Error: no such instruction: `save ECX as SEH handler' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:103: Error: too many memory references for `mov' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:103: Error: no such instruction: `set ECX to -1' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:104: Error: invalid char '[' beginning operand 1 `[edx+08h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:104: Error: no such instruction: `save ECX as next SEH item' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:105: Error: invalid char '[' beginning operand 2 `[edx+08h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:105: Error: no such instruction: `load address of next SEH item' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:106: Error: invalid char '[' beginning operand 1 `[eax+02ch]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:106: Error: no such instruction: `save next SEH' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:108: Error: invalid char '[' beginning operand 2 `[eax+028h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:108: Error: no such instruction: `load the address of the next context > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:109: Error: invalid char '[' beginning operand 1 `[eax+04h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:109: Error: no such instruction: `save the address of the next context > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:110: Error: invalid char '[' beginning operand 2 `[esp+0ch]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:110: Error: no such instruction: `load the address of the void pointer > arg2' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:111: Error: invalid char '[' beginning operand 1 `[edx+04h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:111: Error: no such instruction: `save the address of the void pointer > onto the context stack' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:112: Error: invalid char '[' beginning operand 1 `[eax+018h]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:112: Error: no such instruction: `save SSE2 control word' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:113: Error: invalid char '[' beginning operand 1 `[eax+01ch]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:113: Error: no such instruction: `save x87 control word' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:114: Error: too many memory references for `mov' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:114: Error: no such instruction: `load helper code executed after fn() > eturns' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:115: Error: invalid char '[' beginning operand 1 `[edx]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:115: Error: no such instruction: `save helper code executed adter fn() > eturns' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:116: Error: too many memory references for `xor' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:116: Error: no such instruction: `set EAX to zero' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:118: Error: no such instruction: `boost_fcontext_make ENDP' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:120: Error: no such instruction: `boost_fcontext_link PROC' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:121: Error: invalid char '[' beginning operand 2 `[esp-0ch]' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:121: Error: no such instruction: `adjust the stack to proper boundarie > ' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:122: Error: too many memory references for `test' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:122: Error: junk `a next context was given' after expression > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:122: Error: number of operands mismatch for `test' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:123: Error: no such instruction: `jump to finish' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:125: Error: junk `address of the next context on the stack' after expr > ssion > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:126: Error: junk `address of the current context on the stack' after e > pression > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:127: Error: no such instruction: `install next context' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:130: Error: too many memory references for `xor' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:130: Error: no such instruction: `set EAX to zero' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:131: Error: no such instruction: `exit code is zero' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:132: Error: no such instruction: `exit application' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:134: Error: no such instruction: `boost_fcontext_link ENDP' > ibs\context\src\asm\fcontext_i386_ms_pe_masm.asm:135: Error: no such instruction: `end' > "g++" -x assembler-with-cpp -O3 -finline-functions -Wno-inline -Wall -march=i686 -m32 -DBOOST_ALL_NO_LIB=1 -DNDEBUG > I"." -c -o "bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-32\architecture-x86\instruction-set-i686\li > k-static\asm\fcontext_i386_ms_pe_masm.o" "libs\context\src\asm\fcontext_i386_ms_pe_masm.asm" > ..failed gcc.compile.asm bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-32\architecture-x86\instructio > -set-i686\link-static\asm\fcontext_i386_ms_pe_masm.o... > cc.compile.c++ bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-32\architecture-x86\instruction-set-i686 > link-static\stack_helper_windows.o > cc.compile.c++ bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-32\architecture-x86\instruction-set-i686 > link-static\seh.o > ibs\context\src\seh.cpp: In function 'char* exception_description(const _EXCEPTION_RECORD*, char*, size_t)': > ibs\context\src\seh.cpp:21:40: error: '_TRUNCATE' was not declared in this scope > ibs\context\src\seh.cpp:21:100: error: '_snprintf_s' was not declared in this scope > ibs\context\src\seh.cpp:24:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:25:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:26:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:27:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:28:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:29:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:30:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:31:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:32:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:33:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:34:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:35:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:36:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:37:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:38:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:39:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:40:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:41:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:42:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:43:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:44:53: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings] > ibs\context\src\seh.cpp:47:36: error: '_TRUNCATE' was not declared in this scope > ibs\context\src\seh.cpp:47:71: error: '_snprintf_s' was not declared in this scope > ibs\context\src\seh.cpp: At global scope: > ibs\context\src\seh.cpp:52:1: error: 'EXCEPTION_DISPOSITION' does not name a type > ibs\context\src\seh.cpp:9:15: warning: 'char* exception_description(const _EXCEPTION_RECORD*, char*, size_t)' defined b > t not used [-Wunused-function] > "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -march=i686 -m32 -DBOOST_ALL_NO_LIB=1 -DNDEBUG > -I"." -c -o "bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-32\architecture-x86\instruction-set-i686\ > ink-static\seh.o" "libs\context\src\seh.cpp" > ..failed gcc.compile.c++ bin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-32\architecture-x86\instructio > -set-i686\link-static\seh.o... > ..skipped <pbin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-32\architecture-x86\instruction-set-i686\li > k-static>libboost_context-mgw46-1_46_1.a(clean) for lack of <pbin.v2\libs\context\build\gcc-mingw-4.6.0\release\address > model-32\architecture-x86\instruction-set-i686\link-static>asm\fcontext_i386_ms_pe_masm.o... > ..skipped <pbin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model-32\architecture-x86\instruction-set-i686\li > k-static>libboost_context-mgw46-1_46_1.a for lack of <pbin.v2\libs\context\build\gcc-mingw-4.6.0\release\address-model- > 2\architecture-x86\instruction-set-i686\link-static>asm\fcontext_i386_ms_pe_masm.o... > ..skipped <pstage\lib>libboost_context-mgw46-1_46_1.a for lack of <pbin.v2\libs\context\build\gcc-mingw-4.6.0\release\a > dress-model-32\architecture-x86\instruction-set-i686\link-static>libboost_context-mgw46-1_46_1.a... > ..failed updating 2 targets... > ..skipped 3 targets... > ..updated 7 targets...

1 0

[rational] proposed gcd and lcm for rational
by Thomas Taylor 22 Jul '11

22 Jul '11

Dear boost users and maintainers, As I needed these functions myself I have added a gcd and an lcm for the rational type. Feel free to do with the code whatever you want, if suitable add it to rational.hpp. Presumably this could be reworked as partial specialisation of boost::math::gcd and boost::math::lcm respectively (if there is a trait like is_rational). HTH, Thomas

5 7

[range] istream_range from a temporary istream
by Nathan Ridge 22 Jul '11

22 Jul '11

Hello, The boost::istream_range function currently takes its parameter by lvalue reference (i.e. istream&). Can this be changed to rvalue reference (istream&&)? This way one can write things like: vector<T> v; push_back(v, istream_range<T>(ifstream("some_file.txt"))); Regards, Nate.

3 5

boost::units primer explained / conversion factors required
by Michael Powell 22 Jul '11

22 Jul '11

Okay, here's what we need to get at, for starters. And maybe an illustration or three and a little exchange will go a long way towards helping my better comprehend units. I'm starting with a set of SI calculations for oil and gas constants calculations. Eventually we will need to accommodate US units as well. But not quite yet. We need to get at a calculation involving Pressure Gradient, which ends up being metric::bar/si::meter (bars over meters) in specific units, or I suppose si::pressure/si::length might also work. Then we need to get after Fluid Density, which ends up being si::kilogram/si:meter^3 (kilograms over cubic meters) in specific units, or I suppose si::mass/si::meter^3 (I don't know what this looks like in terms of boost::units, maybe one of the volumes?), or perhaps make use of mass_density? We take all that and divide Pressure Gradient by Fluid Density to arrive at what we hope will be the the conversion factor: 0.0000981. Which we could specify that as a constant, but I like proving it through the software first (plausibly once) when we ask for it. Similar type calculations would follow for US units involving gallons, cubic inches, inches, and inches per foot, along these lines. So I need some examples will spell it out for me. The learning curve using boost::units is just too steep for me right now without it. Any tips or pointers along these lines would be much appreciated. Thank you, Michael

2 6

[serialization] Memory leaks even with shared_ptrs
by cc caprani 22 Jul '11

22 Jul '11

Hi All, Sorry for posting twice in two days, but I'm having lots of trouble getting this right. Robert points out in the bus route example that the memory leaks can be solved using shared_ptrs (bottom of this page: http://www.boost.org/doc/libs/1_47_0/libs/serialization/doc/tutorial.html#e… ) I have a basic example (below), quite like the bus route, that has memory leaks when using raw pointers. I've converted it to shared_ptrs but the leaks are exactly the same. Where have I gone wrong? I'm using VS2010 (hence the memory leak headers & function call to _CrtDumpMemoryLeaks();). Any help much appreciated! -------------------------------------------------------- Example that replicates problem: #define _CRTDBG_MAP_ALLOC #include <stdlib.h> #include <crtdbg.h> #include <boost/archive/xml_iarchive.hpp> #include <boost/archive/xml_oarchive.hpp> #include <boost/serialization/string.hpp> #include <boost/serialization/vector.hpp> #include <boost/serialization/export.hpp> #include <boost/serialization/shared_ptr.hpp> #include <boost/shared_ptr.hpp> #include <boost/make_shared.hpp> #include <iostream> #include <fstream> #include <string> class Distribution { public: Distribution(void) {}; ~Distribution(void) {}; virtual std::string getType() = 0; protected: std::string m_Type; private: friend class boost::serialization::access; template<class Archive> void serialize(Archive& ar, const unsigned int version) {}; }; BOOST_SERIALIZATION_ASSUME_ABSTRACT(Distribution) class ContinuousDist : public Distribution { public: ContinuousDist() { m_Type = "Continuous"; m_Location = 80.0; m_Scale = 5.0; m_Shape = 0.0; }; ~ContinuousDist(void) {}; virtual std::string getType() {return m_Type;}; private: double m_Location; double m_Scale; double m_Shape; friend class boost::serialization::access; template<class Archive> void serialize(Archive& ar, const unsigned int version) { ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(Distribution) & BOOST_SERIALIZATION_NVP(m_Type) & BOOST_SERIALIZATION_NVP(m_Location) & BOOST_SERIALIZATION_NVP(m_Scale) & BOOST_SERIALIZATION_NVP(m_Shape); }; }; BOOST_CLASS_EXPORT(ContinuousDist); class DiscreteDist : public Distribution { public: DiscreteDist(void) { m_Type = "Discrete"; m_Data.push_back(1.2); m_Data.push_back(2.5); m_PMF.push_back(0.8); m_PMF.push_back(0.2); }; ~DiscreteDist(void){}; virtual std::string getType() {return m_Type;}; private: std::vector<double> m_Data; std::vector<double> m_PMF; friend class boost::serialization::access; template<class Archive> void serialize(Archive& ar, const unsigned int version) { ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(Distribution) & BOOST_SERIALIZATION_NVP(m_Type) & BOOST_SERIALIZATION_NVP(m_Data) & BOOST_SERIALIZATION_NVP(m_PMF); }; }; BOOST_CLASS_EXPORT(DiscreteDist); typedef boost::shared_ptr<Distribution> DistributionPtr; class Parameter { public: Parameter() { m_ID = 0; }; Parameter(int id, int type) { m_ID = id; if(type == 1) m_pDist = boost::make_shared<DiscreteDist>(); else m_pDist = boost::make_shared<ContinuousDist>(); }; ~Parameter(void){}; DistributionPtr getDist() {return m_pDist;}; int getID() {return m_ID;}; private: DistributionPtr m_pDist; int m_ID; friend class boost::serialization::access; template<class Archive> void serialize(Archive& ar, const unsigned int version) { ar & BOOST_SERIALIZATION_NVP(m_ID) & BOOST_SERIALIZATION_NVP(m_pDist); }; }; typedef boost::shared_ptr<Parameter> ParameterPtr; void load(std::vector<ParameterPtr>& vP, std::string file) { std::ifstream ifs(file.c_str()); boost::archive::xml_iarchive ia(ifs); ia >> BOOST_SERIALIZATION_NVP(vP); } void save(std::vector<ParameterPtr>& vP, std::string file) { std::ofstream ofs(file.c_str()); boost::archive::xml_oarchive oa(ofs); oa << BOOST_SERIALIZATION_NVP(vP); } int main() { // tbe file to read/save from/to std::string file = "archive.xml"; // make some Parmeters std::vector<ParameterPtr> vParam; vParam.push_back( boost::make_shared<Parameter>(1,1) ); vParam.push_back( boost::make_shared<Parameter>(2,2) ); // display for checking for(unsigned int i = 0; i != vParam.size(); ++i) std::cout << "P: " << vParam.at(i)->getDist()->getType() << std::endl; // save the file std::cout << "Writing..." << std::endl; save(vParam,file); // read the file std::cout << "Reading..." << std::endl; load(vParam,file); // display for checking for(unsigned int i = 0; i != vParam.size(); ++i) std::cout << "P: " << vParam.at(i)->getDist()->getType() << std::endl; std::cin.get(); // hold console window open _CrtDumpMemoryLeaks(); // report memory leaks }

3 6

Enums to/from Strings
by John M. Dlugosz 22 Jul '11

22 Jul '11

Any thoughts or pointers on the best way to support rendering and parsing of enumerated constants? Some only need to be printed, as for debug messages. Others need to be parsed as well, such as from a configuration file. I'm thinking the solution should provide for uniform access to the conversion including existing uses such as feeding an enumeration constant to Boost.Format and having it automatically render as the string.

2 2

determine whether the compilation is occuring on mac os
by Sean Farrow 22 Jul '11

22 Jul '11

Hi: I'm writing a cross platform app and need to determine whether I am compiling on windows/mac os. I note there is a windows configuration define in boost.config, but is there an equivalent mac one? Cheers Sean.

1 0

Boost.Iterator runtime assertion with MSVC
by Narinder Claire 22 Jul '11

22 Jul '11

Hello The following piece of code : ____________________ #include<string> #include<map> #include<iostream> #include<iterator> #include<boost/iterator/transform_iterator.hpp> typedef std::map<std::string, int> map; typedef map::const_iterator const_iterator; struct transformer { typedef std::string result_type; const result_type & operator()(const std::pair<const result_type, int> & thePair)const { return thePair.first; } }; typedef boost::transform_iterator<transformer, const_iterator > const_key_iterator; int main() { map m; m["one"]=1; m["two"]=2; const_key_iterator key_iterator(m.begin(),transformer()); // Following 3 lines work fine const std::string &temp = *key_iterator; std::string::const_iterator it_works = temp.begin(); std::cout << *it_works; // Following 2 lines cause crash when // compiled with VS2010 & VS2008 std::string::const_iterator it_fails = key_iterator->begin(); std::cout << *it_fails ; } ________________________________ executes fine when compiled with mingw(gcc 4.5.2) and gcc 4.5.2(Ubuntu 11.04) but crashes when compiled with VS2010 & VS2008. The issue seems to be something about not being allowed to dereference an iterator toa string. Can anyone shed any light on this ? I ensured that language extensions were NOT disabled. Rgds N

2 1

Using thread library in MFC DLL causes assertion failure
by Kean Mariotti 22 Jul '11

22 Jul '11

Hi everybody, I am working on a MFC DLL project with Visual Studio 2010. Since I have started to use the boost thread library in my DLL I get error messages, when from another program I try to dynamically load the DLL. I recreated the problem, apparently the errors occur when from any MFC DLL project is included one header of the thread library (I tried with barrier.hpp, condition_variable.hpp and thread.hpp). Below is shown what the messages look like: 1. Debug assertion failed! Program: ... File: ...\dllinit.cpp Line: 607 2. then I press ignore... 3. Debug assertion failed! Program: ... File: ...\dllmodul.cpp Line: 135 4. then I press ignore and the program correctly goes on with its execution... I have found an older thread in which was explained a very similar issue: http://comments.gmane.org/gmane.comp.lib.boost.user/49747 but apparently nothing has been fixed since that time. I hope somebody has a suggestion.

1 0

boost::units primer needed
by Michael Powell 21 Jul '11

21 Jul '11

Boost Units users, I need to find a *really* good boost::units primer to get me started. we've got some units-based calculations that need to be developed and I hope to make use of boost in order to facilitate those calculations taking place. so far what I am thinking of as a basic type calculation isn't panning out quite right, more likely I am failing to grasp just what I need to do to string together the quantities in accordance with the units framework which allows the calculations to happen properly... I don't know if any of this is making sense. Kind regards, Michael

2 1

[Review] Lockfree review starts today, July 18th
by Hartmut Kaiser 21 Jul '11

21 Jul '11

Hi all, The review of Tim Blechmann's Boost.Lockfree library starts today, July 18th 2011, and will end on July 28th. I really hope to see your vote and your participation in the discussions on the Boost mailing lists! ----------------------------------------------------- About the library: Boost.Lockfree provides implementations of lock-free data structures. Lock-free data structures can be accessed by multiple threads without the necessity of blocking synchronization primitives such as guards. Lock-free data structures can be used in real-time systems, where blocking algorithms may lead to high worst-case execution times, to avoid priority inversion, or to increase the scalability for multi-processor machines. The following data structures are provided: - boost::lockfree::fifo, a lock-free fifo queue - boost::lockfree::stack, a lock-free stack - boost::lockfree::atomic_int, an atomic integer class The library is accessible from here: http://tim.klingt.org/boost_lockfree.tag.gz. Boost.Lockfree depends on C++0x atomics. They are not well supported with current compilers yet. For this reason Boost.Lockfree depends on the *unreviewed* Boost.Atomic library, that emulates C++0x atomics for C++98. This review is about Boost.Lockfree and not about Boost.Atomic, although it is included in the tarball and the git repository. If Boost.Lockfree will be accepted, it won't be merged into trunk before Boost.Atomic is accepted. --------------------------------------------------- Please always state in your review, whether you think the library should be accepted as a Boost library! Additionally please consider giving feedback on the following general topics: - What is your evaluation of the design? - What is your evaluation of the implementation? - What is your evaluation of the documentation? - What is your evaluation of the potential usefulness of the library? - Did you try to use the library? With what compiler? Did you have any problems? - How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? - Are you knowledgeable about the problem domain? Regards Hartmut Review Manager

10 21

[Serialization] getting version of items stored in STL collection
by cc caprani 21 Jul '11

21 Jul '11

I'm converting parts of a program to use boost::shared_ptr. I have a vector of pointers to objects std::vector<Object*> which now becomes std::vector<ObjectPtr> where ObjectPtr = make_shared<Object>(). I must support archives (XML files) created previously. Boost::serialization looks after saving STL collections very nicely. However, now, in reading a file, I need to determine the item_version in the collection so I can read in a vector of Object* or ObjectPtr. I also need to change the item_version when saving new files to indicate ObjectPtrs are being saved. I've dug through the documentation and source for hours but can't find anything that I can use (my own limitations perhaps?). This vector is NOT a class member and so class versioning does not apply unfortunately. Also, I am using bespoke load/save functions and NOT the serialize(Archive& ar, const unsigned int version) which would avoid this problem (I posted about this before - due to move from MFC to boost and mix of Doc/View architecture). I realize now I should have put a class version member of the MyAppDoc file structure which would be read in first. This would save all the pain. I've written some functions to interface with the file for the meantime, but I'm sure there must be a better solution: template<class Archive, class T> inline void load_vsp_from_vp(Archive& ar, std::vector<boost::shared_ptr<T>>& vPtr, const char* name) { std::vector<T*> vT; ar & boost::serialization::make_nvp(name, vT); boost::shared_ptr<T> ptr; vPtr.assign(vT.size(), ptr); for(int i = 0; i != vT.size(); ++i) vPtr.at(i).reset( vT.at(i) ); } template<class Archive, class T> inline void save_vp_from_vsp(Archive& ar, std::vector<boost::shared_ptr<T>>& vPtr, const char* name) { std::vector<T*> vT; for(int i = 0; i != vPtr.size(); ++i) vT.push_back( vPtr.at(i).get() ); ar & boost::serialization::make_nvp(name, vT); } Use as: save_vp_from_vsp<boost::archive::xml_oarchive, Object>(oa, m_vObject, "m_vObject"); Any help appreciated.

2 2

Re: [Boost-users] Boost String Algo Compilation failure
by Narinder Claire 21 Jul '11

21 Jul '11

Resolved Language extensions were disabled in the project settings. Re-enabling them allowed successful compilation. Rgds N

2 1

boost interprocess intrusive_ptr question
by Brian 20 Jul '11

20 Jul '11

Hello I'm having a bit of trouble with something and I was hoping someone would be able to help me out. I'm using boost interprocess. Here's what I have: class Animal { ... code removed... } class Dog : public Animal { ... code removed... } class Cat : public Animal { ... code removed... } typedef boost::interprocess::allocator<intrusive_ptr<Animal, offset_ptr<Animal> >, managed_shared_memory::segment_manager> ShmemAllocator; typedef vector<intrusive_ptr<Animal, offset_ptr<Animal> >, ShmemAllocator> MyVector; int main(int argc, char * const argv[]) { ..code removed.. managed_shared_memory segment(create_only, "MySharedMemory", 65536); const ShmemAllocator alloc_inst(segment.get_segment_manager()); MyVector *myVector = segment.construct<MyVector>("MyVector")(alloc_inst); intrusive_ptr<Dog, offset_ptr<Dog> > dogPtr(segment.construct<Dog>("DogPtr")()); myVector->push_back(dogPtr); The myVector->push_back(dogPtr) line gives the following error: error: no matching function for call to 'boost::container::vector<boost::interprocess::intrusive_ptr<Animal, boost::interprocess::offset_ptr<Animal> >, boost::interprocess::allocator<boost::interprocess::intrusive_ptr<Animal, boost::interprocess::offset_ptr<Animal> >, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void>, 0ul>, boost::interprocess::iset_index> > >::push_back(boost::interprocess::intrusive_ptr<Dog, boost::interprocess::offset_ptr<Dog> >&)' I have been unable to get this to work. Can someone please tell me how to get my dogPtr into my Animal array? I was able to get it to work like this: intrusive_ptr<Animal, offset_ptr<Animal> > animalPtr(dynamic_pointer_cast<Animal>(dogPtr.get())); myVector->push_back(animalPtr); But that's kind of ugly, creating a new variable and all. I'm hoping I don't have to do that. Many thanks

2 1

Boost String Algo Compilation failure
by Narinder Claire 20 Jul '11

20 Jul '11

Hello The following piece won't code : ----------------------------------- #include<string> #include<vector> #include<boost/algorithm/string.hpp> int main() { std::string str1("hello abc-*-ABC-*-aBc goodbye"); typedef std::vector< std::string > split_vector_type; split_vector_type SplitVec; // #2: Search for tokens boost::split( SplitVec, str1, boost::is_any_of("-*"), boost::token_compress_on ); } ----------------------------------------- compiles successfully with gcc 4.5.2(Linux) & VS2008 but fails with VS2010 with the following output: ------------------------------------------ 1>------ Build started: Project: main, Configuration: Debug Win32 ------ 1> main.cpp 1>c:\boost_1_47_0\boost\algorithm\string\find_iterator.hpp(184): warning C4224: nonstandard extension used : formal parameter 'Collection' was previously defined as a type 1>c:\boost_1_47_0\boost\algorithm\string\find_iterator.hpp(364): warning C4224: nonstandard extension used : formal parameter 'Collection' was previously defined as a type 1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\xutility(2227): warning C4996: 'std::_Copy_impl': Function call with parameters that may be unsafe - this call relies on the caller to check that the passed values are correct. To disable this warning, use -D_SCL_SECURE_NO_WARNINGS. See documentation on how to use Visual C++ 'Checked Iterators' 1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\xutility(2212) : see declaration of 'std::_Copy_impl' 1> c:\boost_1_47_0\boost\algorithm\string\detail\classification.hpp(102) : see reference to function template instantiation '_OutIt std::copy<const char*,char*>(_InIt,_InIt,_OutIt)' being compiled 1> with 1> [ 1> _OutIt=char *, 1> _InIt=const char * 1> ] 1> c:\boost_1_47_0\boost\algorithm\string\classification.hpp(206) : see reference to function template instantiation 'boost::algorithm::detail::is_any_ofF<CharT>::is_any_ofF<boost::iterator_range<IteratorT>>(const RangeT &)' being compiled 1> with 1> [ 1> CharT=char, 1> IteratorT=const char *, 1> RangeT=boost::iterator_range<const char *> 1> ] 1> d:\workspace\papafactory\develop\boost.string.split\main.cpp(15) : see reference to function template instantiation 'boost::algorithm::detail::is_any_ofF<CharT> boost::algorithm::is_any_of<const char[3]>(RangeT (&))' being compiled 1> with 1> [ 1> CharT=char, 1> RangeT=const char [3] 1> ] 1>c:\boost_1_47_0\boost\range\concepts.hpp(140): error C2146: syntax error : missing ',' before identifier 'traversal_category' 1> c:\boost_1_47_0\boost\concept\detail\has_constraints.hpp(42) : see reference to class template instantiation 'boost::range_detail::SinglePassIteratorConcept<Iterator>' being compiled 1> with 1> [ 1> Iterator=std::_String_iterator<char,std::char_traits<char>,std::allocator<char>> 1> ] 1> c:\boost_1_47_0\boost\concept\detail\msvc.hpp(53) : see reference to class template instantiation 'boost::concepts::not_satisfied<Model>' being compiled 1> with 1> [ 1> Model=boost::range_detail::SinglePassIteratorConcept<std::_String_iterator<char,std::char_traits<char>,std::allocator<char>>> 1> ] 1> c:\boost_1_47_0\boost\range\concepts.hpp(259) : see reference to class template instantiation 'boost::concepts::require<Model>' being compiled 1> with 1> [ 1> Model=boost::range_detail::SinglePassIteratorConcept<std::_String_iterator<char,std::char_traits<char>,std::allocator<char>>> 1> ] 1> c:\boost_1_47_0\boost\concept\detail\has_constraints.hpp(42) : see reference to class template instantiation 'boost::SinglePassRangeConcept<T>' being compiled 1> with 1> [ 1> T=const boost::iterator_range<std::_String_iterator<char,std::char_traits<char>,std::allocator<char>>> 1> ] 1> c:\boost_1_47_0\boost\concept\detail\msvc.hpp(53) : see reference to class template instantiation 'boost::concepts::not_satisfied<Model>' being compiled 1> with 1> [ 1> Model=boost::SinglePassRangeConcept<const boost::iterator_range<std::_String_iterator<char,std::char_traits<char>,std::allocator<char>>>> 1> ] 1> c:\boost_1_47_0\boost\range\algorithm\equal.hpp(162) : see reference to class template instantiation 'boost::concepts::require<Model>' being compiled 1> with 1> [ 1> Model=boost::SinglePassRangeConcept<const boost::iterator_range<std::_String_iterator<char,std::char_traits<char>,std::allocator<char>>>> 1> ] 1> c:\boost_1_47_0\boost\range\iterator_range_core.hpp(434) : see reference to function template instantiation 'bool boost::range::equal<boost::iterator_range<IteratorT>,boost::iterator_range<IteratorT>>(const SinglePassRange1 &,const SinglePassRange2 &)' being compiled 1> with 1> [ 1> IteratorT=std::_String_iterator<char,std::char_traits<char>,std::allocator<char>>, 1> SinglePassRange1=boost::iterator_range<std::_String_iterator<char,std::char_traits<char>,std::allocator<char>>>, 1> SinglePassRange2=boost::iterator_range<std::_String_iterator<char,std::char_traits<char>,std::allocator<char>>> 1> ] 1> c:\boost_1_47_0\boost\algorithm\string\find_iterator.hpp(328) : see reference to function template instantiation 'bool boost::operator ==<IteratorT,IteratorT>(const boost::iterator_range<IteratorT> &,const boost::iterator_range<IteratorT> &)' being compiled 1> with 1> [ 1> IteratorT=std::_String_iterator<char,std::char_traits<char>,std::allocator<char>> 1> ] 1> c:\boost_1_47_0\boost\algorithm\string\find_iterator.hpp(322) : while compiling class template member function 'bool boost::algorithm::split_iterator<IteratorT>::equal(const boost::algorithm::split_iterator<IteratorT> &) const' 1> with 1> [ 1> IteratorT=input_iterator_type 1> ] 1> c:\program files (x86)\microsoft visual studio 10.0\vc\include\xutility(373) : see reference to class template instantiation 'boost::algorithm::split_iterator<IteratorT>' being compiled 1> with 1> [ 1> IteratorT=input_iterator_type 1> ] 1> c:\boost_1_47_0\boost\iterator\transform_iterator.hpp(49) : see reference to class template instantiation 'std::iterator_traits<_Iter>' being compiled 1> with 1> [ 1> _Iter=find_iterator_type 1> ] 1> c:\boost_1_47_0\boost\iterator\transform_iterator.hpp(75) : see reference to class template instantiation 'boost::detail::transform_iterator_base<UnaryFunc,Iterator,Reference,Value>' being compiled 1> with 1> [ 1> UnaryFunc=copy_range_type, 1> Iterator=find_iterator_type, 1> Reference=boost::use_default, 1> Value=boost::use_default 1> ] 1> c:\boost_1_47_0\boost\algorithm\string\iter_find.hpp(168) : see reference to class template instantiation 'boost::transform_iterator<UnaryFunc,Iterator>' being compiled 1> with 1> [ 1> UnaryFunc=copy_range_type, 1> Iterator=find_iterator_type 1> ] 1> c:\boost_1_47_0\boost\algorithm\string\split.hpp(149) : see reference to function template instantiation 'SequenceSequenceT &boost::algorithm::iter_split<SequenceSequenceT,RangeT,boost::algorithm::detail::token_finderF<PredicateT>>(SequenceSequenceT &,RangeT &,FinderT)' being compiled 1> with 1> [ 1> SequenceSequenceT=split_vector_type, 1> RangeT=std::string, 1> PredicateT=boost::algorithm::detail::is_any_ofF<char>, 1> FinderT=boost::algorithm::detail::token_finderF<boost::algorithm::detail::is_any_ofF<char>> 1> ] 1> d:\workspace\p\develop\boost.string.split\main.cpp(15) : see reference to function template instantiation 'SequenceSequenceT &boost::algorithm::split<split_vector_type,std::string,boost::algorithm::detail::is_any_ofF<CharT>>(SequenceSequenceT &,RangeT &,PredicateT,boost::algorithm::token_compress_mode_type)' being compiled 1> with 1> [ 1> SequenceSequenceT=split_vector_type, 1> CharT=char, 1> RangeT=std::string, 1> PredicateT=boost::algorithm::detail::is_any_ofF<char> 1> ] 1>c:\boost_1_47_0\boost\range\concepts.hpp(140): error C2065: 'traversal_category' : undeclared identifier 1>c:\boost_1_47_0\boost\range\concepts.hpp(140): error C2146: syntax error : missing ',' before identifier 'traversal_category' 1>c:\boost_1_47_0\boost\range\concepts.hpp(140): error C2065: 'traversal_category' : undeclared identifier 1>c:\boost_1_47_0\boost\range\concepts.hpp(140): error C2893: Failed to specialize function template 'boost::concepts::require<Model> boost::concepts::require_(void (*)(Model))' 1> With the following template arguments: 1> 'boost::Convertible' 1>c:\boost_1_47_0\boost\range\concepts.hpp(140): error C2056: illegal expression ========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

1 0

Linking error in boost program options under Windows
by Marc de Kamps 20 Jul '11

20 Jul '11

I'm linking to boost programming options under windows. I get the following linker error: miind.obj : error LNK2001: unresolved external symbol "public: static unsigned int const boost::program_options::options_description::m_default_line_length" I am using the BoostPro installer version for boost 1.47 under windows XP using Visual Studio 10. I link against: boost_program_options-vc100-mt-gd-1_47.lib in Debug mode. If I don't link against it I get a lot more missing symbols, so it's not simply a matter of forgetting to the boost program options library. The problem occurs in the Debug and Release version. The same code compiles under Linux. Marc

1 0

hardware interfaces
by Kraus Philipp 20 Jul '11

20 Jul '11

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hello, is there any support within Boost for USB devices or anything else? I've found that the ASIO can handle with serial ports (and network interfaces) but my primary question is there a support for other devices ? Thanks a lot Phil -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.17 (Darwin) Comment: GPGTools - http://gpgtools.org iEYEARECAAYFAk4mogUACgkQ6s0Ua5LeGumdHQCdGQrR/YXnio/cvWtHhRBGbUGz k5gAmweGD3Him5X+b8VIsTzYC/pN/cok =+Dhx -----END PGP SIGNATURE-----

1 0

thread safe queue
by Sean Farrow 20 Jul '11

20 Jul '11

Hi: Has anyone written or does anyone know of a thread safe queue that uses boost to allow it to be cross platform? Cheers Sean.

3 4

c2248 with a queue!
by Sean Farrow 20 Jul '11

20 Jul '11

Hi: I'm using a queue written I think as I remember by Antony Williams (sorry if this is incorrect but it was certainly someone in the uk). The code is below, I'm getting 2 c2248 errors indicated by visual c++ 2010 at the last line of the class i.e the line with }; Does anyone know what's causing this? The errors are: 1>d:\dropbox\mackie display reader\surface reader\surface reader\queue.hpp(18): error C2248: 'boost::mutex::mutex' : cannot access private member declared in class 'boost::mutex' c:\program files\boost\boost\thread\win32\mutex.hpp(26) : see declaration of 'boost::mutex::mutex' c:\program files\boost\boost\thread\win32\mutex.hpp(22) : see declaration of 'boost::mutex' This diagnostic occurred in the compiler generated function 'concurrent_queue<Data>::concurrent_queue(concurrent_queue<Data> &)' with [ Data=PmEvent ] 1>d:\dropbox\mackie display reader\surface reader\surface reader\queue.hpp(18): error C2248: 'boost::condition_variable::condition_variable' : cannot access private member declared in class 'boost::condition_variable' c:\program files\boost\boost\thread\win32\condition_variable.hpp(299) : see declaration of 'boost::condition_variable::condition_variable' c:\program files\boost\boost\thread\win32\condition_variable.hpp(295) : see declaration of 'boost::condition_variable' This diagnostic occurred in the compiler generated function 'concurrent_queue<Data>::concurrent_queue(concurrent_queue<Data> &)' with [ Data=PmEvent ] PmEvent is just a standard c structure: typedef struct { PmMessage message; PmTimestamp timestamp; } PmEvent; PmTimestamp and PmMessage are defined as: typedef int32_t PmMessage/PmTimeStamp; any help appreciated. Cheers Sean. --begin code- #include <queue> #include <boost/thread/mutex.hpp> #include <boost/thread/condition_variable.hpp> template <typename Data> class concurrent_queue { private: boost::mutex the_mutex; boost::condition_variable the_condition_variable; std::queue<Data> the_data; public: void push(Data const& data) { boost::mutex::scoped_lock lock(the_mutex); the_queue.push(data); lock.unlock(); the_condition_variable.notify_one(); } }; --end code--

2 2

Integer vs. Double values for link weights in Graph
by Jens Buysse 20 Jul '11

20 Jul '11

Dear all, I'm new to the BOOST library (and actually also to c++). I have the following problem: I want to use the dijkstra algorithm for computing shortest paths in a network. For this I calculate weights, which in my case take the form of double < 1. But it seems internally boost converts to an integer. Is there a way to use double without miltilplying it with e.g. 100 to get Integers? Kind regards Jens Buysse -- Jens Buysse Research Group Broadband Communication Networks (IBCN) Department of Information Technology (INTEC), Ghent University/ IBBT Gaston Crommenlaan 8 bus 201, B-9050 Gent, Belgium tel : +32 9 33 14 942 fax : +32 9 33 14 899 mobile : +32 479 32 21 72 e-mail : jens.buysse(a)intec.ugent.be skype : jens.buysse web : http://ibcn.intec.ugent.be/ web : www.myspace.com/aratf

2 2

Implementing Range Adaptor or "transformation" iterator
by John M. Dlugosz 20 Jul '11

20 Jul '11

I see the documentation "doc/html/range/reference/extending/method_3/method_3_1.html" and want to do something like that. The Adaptor I want to write will transform the elements and provide a lazy transformed view. So, I need the return range to be a pair of transformed iterators, and a transform iterator works just like the underlying iterator only the * operator will apply my function to the value as it fetches it. But, it seems to me that there should be something like that already. Is there something I'm overlooking in STL or in some other Boost library? Thanks, —John

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[fusion] adapted std::pair and ostream
by Daniel James 20 Jul '11

20 Jul '11

Hi The docs: http://www.boost.org/doc/libs/1_47_0/libs/fusion/doc/html/fusion/adapted/st… seem to suggest that one can pipe an adapted std::pair 'directly' to cout. I find the following though: #include <iostream> #include <boost/fusion/adapted.hpp> // adapt pair. #include <boost/fusion/sequence.hpp> // operator<<() ? #include <boost/fusion/container.hpp> // as_vector int main(int argc, char** argv) { std::pair<std::string, int> p("foo", 7); std::cout << p << std::endl; // does not compile although docs suggest it should. std::cout << boost::fusion::as_vector(p) << std::endl; // compiles and works as expected. return 0; } Am I missing an include? Is sending to cout without first using as_vector actually supported? Daniel

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[TTI] Review for The Type Traits Introspection library by Edward Diener **extended**
by Joel Falcou 20 Jul '11

20 Jul '11

The Type Traits Introspection library by Edward Diener started friday 1st have been *extended* to july 17. Comments and reviews are welcome. =========== What is it? =========== The TTI library, which is an abbreviation for the 'Type Traits Introspection' library, allows a programmer to introspect at compile time the inner elements of a C++ type. The introspection process depends on specifying the name of the inner element by different macros for different types of elements, and then using a generated metafunction to determine whether that element exists within the enclosing type. The inner elements which can be introspected are type, class template, member data, member function, static member data, and static member function. The TTI library is based on the type_traits_ext portion of the Concept Traits Library, with improvements and additions, and also reproduces functionality ( without changing existing code ), for the purposes of completeness, from Boost.MPL regarding introspection of types and templates. The purpose of the library is to provide a consistent set of interfaces for doing compile-time introspection of a type, which other template metaprogrammers can use in their code. If you are at all interested in compile-time introspection of types, please take a look at the functionality of this library. =================== Getting the library =================== The library is available at http://svn.boost.org/svn/boost/sandbox/tti/. The HTML documentation is available at http://svn.boost.org/svn/boost/sandbox/tti/libs/tti/doc/html/index.html and the PDF documentation is available at http://svn.boost.org/svn/boost/sandbox/tti/libs/tti/doc/TypeTraitsIntrospec…. =================== Writing a Review =================== The reviews and all comments should be submitted to the developers list, and the email should have "[TTI] Review" at the beginning of the subject line to make sure it's not missed. Please explicitly state in your review whether the library should be accepted. The general review checklist: - What is your evaluation of the design? - What is your evaluation of the implementation? - What is your evaluation of the documentation? - What is your evaluation of the potential usefulness of the library? - Did you try to use the library? With what compiler? Did you have any problems? - How much effort did you put into your evaluation? A glance? A quick reading? In-depth study? - Are you knowledgeable about the problem domain? And finally, every review should answer this question: - Do you think the library should be accepted as a Boost library? Be sure to say this explicitly so that your other comments don't obscure your overall opinion.

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Limitations / Flaws with transformed_range
by John M. Dlugosz 20 Jul '11

20 Jul '11

I've already noted that the "transformed_range", the class behind boost::adaptors::transform, is not using result_of as documented but seems to be simply looking for result_type, period. I've found another issue, and I consider it a "flaw" because it is a Limitation due to oversight or an artificial restriction, and the deeper workings should handle these cases just fine. Let me explain in detail: The template< class F, class R > struct transformed_range : takes two arguments. The R argument is used for two purposes. It gives the iterator type that will be held, via range_iterator<R>::type. It also gives the exact type of the argument expected by the constructor. Now here is an example from my experiments / work-in-progress: template< class Range > inline transformed_range<ASCII_lower,const Range> operator|( const Range& r, const ASCII_lower_forwarder ) { return transformed_range<ASCII_lower,const Range>( ASCII_lower(), // The underlying transform iterators wants this internal::src_prep(typename std::tr1::is_pointer<Range>::type() ,r) // "source" style argument processing ); } The src_prep is similar to the supplied is_literal, and used for the same purpose. It will package a primitive array as a iterator_range, handing string literals and primitive array objects in the way I intend with respect to nul terminators. It differs from is_literal in several ways, but the idea is the same. Now I don't have to do anything to the Range parameter passed as the type argument to transformed_range, because even when I change the type of the massaged argument, it still has the same underlying iterator type. After all, it gets the iterators from the original range thing passed in. But, the massaged value of r is rejected by the constructor, because it has a different type. It doesn't need to be the same type! It has the same underlying iterator type and could be assigned to it, but the constructor is too strict. It would be a simple matter of passing another template argument to the constructor, as is commonly done with constructors or assignment, and take anything that "works" in that boost::begin and boost::end returns something that can be used to initialize the range_iterator. Copying the class to my own code and changing the constructor to: template <typename R2> transformed_range( F f, R2& r ) : base( boost::make_transform_iterator( boost::begin(r), f ), boost::make_transform_iterator( boost::end(r), f ) ) indeed makes it acceptable to the compiler. (At this point I also noticed that _some_ of the types within the class are qualified by boost::, but not all of them. I know that functions are qualified to prevent argument-dependant lookup, but it is odd that some of the types (or names used in other context) are qualified and sometimes they are not.)

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Re: [Boost-users] [!! SPAM] [wave] Trace output lines with single underscore
by Hartmut Kaiser 20 Jul '11

20 Jul '11

> Many of the rescanning lines in the Wave trace output for a macro I am > tracing show either just a single underscore ( _ ), where the output is > empty, or a number and and underscore ( 1_ ) where it is actually just the > number which is being output. What is the reason for the underscore ? IIRC, the _ is used as a (readable) representation for the (empty) placeholder token, which disappears from the final output, but is helpful for debugging purposes. Regards Hartmut --------------- http://boost-spirit.com

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Boost BCP namespace renaming : dispelling the FUD ?
by BernardH 19 Jul '11

19 Jul '11

Hi, When implementing a library, one might want to neither require nor prevent the library users to also use any version of Boost. I believed that BCP used with namespace renaming would allow the use of (namespace-renamed) Boost in the implementation of such a library without *any* concern about conflict at link time and / or rub-time errors if the library user chooses to also use another Boost version. However, I have been reading that Boost brings some symbols that cannot be renamed because they are out of any namespace, with "C" linkage[*]. This brings the following questions : 1) can a list all such names be found ? 2) To be *completely safe*, must I : 2.1) only avoid using those symbols in my library 2.2) avoid the boost libaries that provide such symbols 2.3) avoid boost libraries that depend on such symbols (how am I to find out which ?) 2.4) avoid boost libraries that depend on the boost libraries providing such symbols (easier to do than 2.3 with bcp, I believe). 2.5) Despair ! (i.e. forgo boost usage under such constraints). Boost is a great set of libraries, I think that it is a pity that a legitimate concern (not imposing a specific Boost version on users) would prevent it's use for implementing libraries : please, help me dispel the Fear, Uncertainty and Doubt over this use case ! Best Regards, Bernard [*] http://stackoverflow.com/questions/2907882/using-concurrently-2-versions-of…

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[wave] Trace output lines with single underscore
by Edward Diener 19 Jul '11

19 Jul '11

Many of the rescanning lines in the Wave trace output for a macro I am tracing show either just a single underscore ( _ ), where the output is empty, or a number and and underscore ( 1_ ) where it is actually just the number which is being output. What is the reason for the underscore ?

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[accumulator] median absolute deviation
by Phil Bouchard 19 Jul '11

19 Jul '11

Hi, I see the median absolute deviation (MAD) is not provided by the accumulator library. Perhaps this is a feature that could be added. Thanks, -Phil

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More on my result_type problem
by John M. Dlugosz 19 Jul '11

19 Jul '11

I see from the source code that the transform range is calling make_transform_iterator which takes two arguments, and that "If Reference is use_default then the reference member of transform_iterator is result_of<UnaryFunction(iterator_traits<Iterator>::reference)>::type." The documentation for result_of explains the need, and shows how to use a result template instead of a result_type simple type in this case. My code follow from the example: struct ASCII_lower { // tell details to result_of template, since VS8 doesn't support decltype keyword. template <typename> struct result; template<typename F, typename T> struct result<F(T)> { typedef T type; }; template< typename CharT > CharT operator() (const CharT& ch) const { if (ch >= 'A' && ch <= 'Z') return ch+0x20; return ch; // unchanged } }; But, I still get an error that result_type is not found! B:\boost/iterator/transform_iterator.hpp(42) : error C2039: 'result_type' : is not a member of 'vst::internal::ASCII_lower' B:\boost/mpl/eval_if.hpp(41) : see reference to class template instantiation 'boost::detail::function_object_result<UnaryFunc>' being compiled with [ UnaryFunc=vst::internal::ASCII_lower ] B:\boost/iterator/iterator_adaptor.hpp(172) : see reference to class template instantiation 'boost::mpl::eval_if<C,F1,F2>' being compiled with [ C=boost::is_same<boost::use_default,boost::use_default>, F1=boost::detail::function_object_result<vst::internal::ASCII_lower>, F2=boost::mpl::identity<boost::use_default> ] It appears to be using function_object_result, not result_of as documented. And that is: template <class UnaryFunc> struct function_object_result { typedef typename UnaryFunc::result_type type; }; which simply turns result_type into type to make eval_if happy, and doesn't do anything fancier. So, it doesn't work as documented, and neither provides another way of passing the parameter in (exposing more arguments from the underlying transform_iterator). Is that a bug, or what? —John

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