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Boost StateChart and Template parameters
by Etienne Philip Pretorius 27 Jul '09

27 Jul '09

Hello List, I would like to have a templated parse function within each of my states. Unfortunatly I am unable to successfully create a version that compiles, perhaps if someone could show how to get it to work. Here is the code: namespace xml { class prolog; template<typename T> class Entity { public: virtual boost::regex regex() const = 0; virtual void parse(T,T) = 0; }; class document : public boost::statechart::state_machine< document, prolog > { public: virtual ~document( ) {}; private: friend class prolog; static boost::regex character, white_space, name_start_character, name_character, name, names, nmtoken, nmtokens, comment, process_instruction_target, process_instruction, CDATA, equal, version_info, encoding_name, encoding_declaration, standalone_document_declaration, xml_declaration, prolog; protected: document( ) { initiate(); }; template<typename T> boost::regex regex( ) const { return state_cast<const Entity<T>&>().regex(); }; template<typename T> void parse( T begin, T end ) { return state_cast<const Entity<T>&>().parse(begin,end); } }; class prolog : public Entity ///<-----needs argument here but compains the 'prolog' is NOT a template , public boost::statechart::simple_state< prolog, document > { public: prolog( ) {}; ~prolog( ) {}; virtual boost::regex regex( ) const { return document::prolog;//FIXME...match element aswell }; virtual void parse( T begin, T end ) { }; private: protected: }; }; Any help on this will be appreciated. Thank you all. Etienne

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Database Template Libraries
by Etienne Philip Pretorius 27 Jul '09

27 Jul '09

Hello list, Just a quick question, are there boost libraries that are similar to this: http://dtemplatelib.sourceforge.net/ If not are there any plans for a generic boost database template library? Just Wandering. Etienne

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boost.datetime query
by Sean Farrow 27 Jul '09

27 Jul '09

Hi: I am working on a project whereby I need the date in the format yyyy-mm-dd (iso format). Am I write in thinking that the boost::Gregorian::to_Iso_string function will do this for me given a date as it's argument? I seem to have some discrepancies between the Embarcadero c++ 2009 implementation of that function and what I think should be happening having used the ms vc++ built version. Any help appreciated. Sean.

1 0

test boost::try_mutex is locked or not
by Boost lzw 26 Jul '09

26 Jul '09

Hi everyone, I just did not find the right member function for it. Can anyone point out the correct function I should use? Thanks. CODE: ----------- boost::try_mutex resourceX; boost::try_mutex::scoped_lock lockX(resourceX); ... if(lockX.locked() == false) // compilation error do sth. ----------- The compiler complains that locked() is not a member function of boost::try_mutex Cheers, Robert

2 1

Number of cores
by Ruediger Berlich 26 Jul '09

26 Jul '09

Hi there, is there a possibility in Boost to find out the number of processor(-core)s on a local system in a platform-independent way ? I'd like to start a corresponding number of threads. Thanks and Best Regards, Ruediger

2 2

problem with boost::phoenix::lambda
by Kim Kuen Tang 25 Jul '09

25 Jul '09

Hi all, the following code double abc=lambda(_a=*ref(it)++)[_a*2.0]()(); // here 'it' is an //iterator produces the error C2440: 'initializing' : cannot convert from 'boost::phoenix::detail::error_expecting_arguments' to 'double' which should not be. The two lines of code let(_a=*ref(it)++)[_a*2.0](); //or lambda(_a=*ref(it)++)[_a*2.0*arg1]()( val); compile fine. Perhaps someone has an answer to this error? ( I use boost trunk version and msvc 2008) To reproduce the errors just compile the code below. Best regards Kim Tang # include <algorithm> # include <vector> # include <boost/spirit/include/phoenix.hpp> using namespace boost::phoenix; using namespace boost::phoenix::arg_names; using namespace boost::phoenix::local_names; int main() { std::vector<double> u(11,1.0); std::vector<double> w(11,2.0); std::vector<double>::const_iterator it=w.begin(); //boost::phoenix::generate(ref(u) // ,lambda(_a=*ref(it)++)[_a*2.0 ] //)(); double abc=lambda(_a=*ref(it)++)[_a*2.0]()(); return 0; }

2 3

Problem in running blocking_udp_echo_client on MacOSX
by n179911 25 Jul '09

25 Jul '09

I am trying to run blocking_udp_echo_client on MacOS X http://www.boost.org/doc/libs/1_35_0/doc/html/boost_asio/example/echo/block… I run it with argument 'localhost 9000' But the program crashes and this is the line in the source which crashes: udp::socket s(io_service, udp::endpoint(udp::v4(), 0)); this is the stack trace: #0 0x918c3e42 in __kill #1 0x918c3e34 in kill$UNIX2003 #2 0x9193623a in raise #3 0x91942679 in abort #4 0x940d96f9 in __gnu_debug::_Error_formatter::_M_error #5 0x0000e76e in __gnu_debug::_Safe_iterator<__gnu_norm::_List_iterator<std::pair<int, boost::asio::detail::reactor_op_queue<int>::op_base*> >, __gnu_debug_def::list<std::pair<int, boost::asio::detail::reactor_op_queue<int>::op_base*>, std::allocator<std::pair<int, boost::asio::detail::reactor_op_queue<int>::op_base*> > > >::_Safe_iterator at safe_iterator.h:124 #6 0x00014729 in boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type::bucket_type at hash_map.hpp:277 #7 0x00019e97 in std::_Construct<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type, boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type> at stl_construct.h:81 #8 0x0001a457 in std::__uninitialized_fill_n_aux<__gnu_cxx::__normal_iterator<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type*, __gnu_norm::vector<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type, std::allocator<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type> > >, unsigned long, boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type> at stl_uninitialized.h:194 #9 0x0001a4e1 in std::uninitialized_fill_n<__gnu_cxx::__normal_iterator<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type*, __gnu_norm::vector<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type, std::allocator<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type> > >, unsigned long, boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type> at stl_uninitialized.h:218 #10 0x0001a509 in std::__uninitialized_fill_n_a<__gnu_cxx::__normal_iterator<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type*, __gnu_norm::vector<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type, std::allocator<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type> > >, unsigned long, boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type, boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type> at stl_uninitialized.h:310 #11 0x0001aa34 in __gnu_norm::vector<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type, std::allocator<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type> >::_M_fill_insert at vector.tcc:365 #12 0x0001acda in __gnu_norm::vector<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type, std::allocator<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type> >::insert at stl_vector.h:658 #13 0x0001ad81 in __gnu_norm::vector<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type, std::allocator<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type> >::resize at stl_vector.h:427 #14 0x0001ae3a in __gnu_debug_def::vector<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type, std::allocator<boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::bucket_type> >::resize at vector:169 #15 0x0001b7be in boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::rehash at hash_map.hpp:221 #16 0x0001bbeb in boost::asio::detail::hash_map<int, boost::asio::detail::reactor_op_queue<int>::op_base*>::hash_map at hash_map.hpp:67 #17 0x0001bc74 in boost::asio::detail::reactor_op_queue<int>::reactor_op_queue at reactor_op_queue.hpp:42 #18 0x0001bd24 in boost::asio::detail::kqueue_reactor<false>::kqueue_reactor at kqueue_reactor.hpp:86 #19 0x0001c000 in boost::asio::detail::service_registry::use_service<boost::asio::detail::kqueue_reactor<false> > at service_registry.hpp:109 #20 0x0001c14d in boost::asio::use_service<boost::asio::detail::kqueue_reactor<false> > at io_service.ipp:195 #21 0x0001c26d in boost::asio::detail::reactive_socket_service<boost::asio::ip::udp, boost::asio::detail::kqueue_reactor<false> >::reactive_socket_service at reactive_socket_service.hpp:111 #22 0x0001c344 in boost::asio::detail::service_registry::use_service<boost::asio::detail::reactive_socket_service<boost::asio::ip::udp, boost::asio::detail::kqueue_reactor<false> > > at service_registry.hpp:109 #23 0x0001c491 in boost::asio::use_service<boost::asio::detail::reactive_socket_service<boost::asio::ip::udp, boost::asio::detail::kqueue_reactor<false> > > at io_service.ipp:195 #24 0x0001c4d5 in boost::asio::datagram_socket_service<boost::asio::ip::udp>::datagram_socket_service at datagram_socket_service.hpp:95 #25 0x0001c59e in boost::asio::detail::service_registry::use_service<boost::asio::datagram_socket_service<boost::asio::ip::udp> > at service_registry.hpp:109 #26 0x0001c6eb in boost::asio::use_service<boost::asio::datagram_socket_service<boost::asio::ip::udp> > at io_service.ipp:195 #27 0x0001c711 in boost::asio::basic_io_object<boost::asio::datagram_socket_service<boost::asio::ip::udp> >::basic_io_object at basic_io_object.hpp:72 #28 0x0001c783 in boost::asio::basic_socket<boost::asio::ip::udp, boost::asio::datagram_socket_service<boost::asio::ip::udp> >::basic_socket at basic_socket.hpp:108 #29 0x0001c865 in boost::asio::basic_datagram_socket<boost::asio::ip::udp, boost::asio::datagram_socket_service<boost::asio::ip::udp> >::basic_datagram_socket at basic_datagram_socket.hpp:107 #30 0x000027bc in main at main.cpp:32 This is the gdb output: (gdb) continue /Developer/SDKs/MacOSX10.5.sdk/usr/include/c++/4.0.0/debug/safe_iterator.h:127: error: attempt to copy-construct an iterator from a singular iterator. Objects involved in the operation: iterator "this" @ 0x0x100420 { type = N11__gnu_debug14_Safe_iteratorIN10__gnu_norm14_List_iteratorISt4pairIiPN5boost4asio6detail16reactor_op_queueIiE7op_baseEEEEN15__gnu_debug_def4listISB_SaISB_EEEEE (mutable iterator); state = singular; } iterator "other" @ 0x0xbfffe8a4 { type = N11__gnu_debug14_Safe_iteratorIN10__gnu_norm14_List_iteratorISt4pairIiPN5boost4asio6detail16reactor_op_queueIiE7op_baseEEEEN15__gnu_debug_def4listISB_SaISB_EEEEE (mutable iterator); state = singular; } Program received signal: “SIGABRT”. (gdb) continue Program received signal: “?”. Does someone has any idea why this example does not work on mac osx? Thank you.

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Using boost library on MacOSx
by n179911 25 Jul '09

25 Jul '09

Hi, I have install boost library using this: $ sudo port install boost It seems download and compile fine on my local machine. But then i tried to compile a simple echo client example from http://www.boost.org/doc/libs/1_35_0/doc/html/boost_asio/examples.html I get a bunch of compiler errors. I am using "g++ -o block_client blocking_udp_echo_client.cpp " Here are some of the errors: $ g++ -o block_client blocking_udp_echo_client.cpp blocking_udp_echo_client.cpp:68:10: error: #include expects "FILENAME" or <FILENAME> blocking_udp_echo_client.cpp:69:10: error: #include expects "FILENAME" or <FILENAME> blocking_udp_echo_client.cpp:70:10: error: #include expects "FILENAME" or <FILENAME> blocking_udp_echo_client.cpp:71:10: error: #include expects "FILENAME" or <FILENAME> blocking_udp_echo_client.cpp:83: error: stray ‘\’ in program blocking_udp_echo_client.cpp:108: error: stray ‘\’ in program blocking_udp_echo_client.cpp:112: error: stray ‘\’ in program Thank you for any help.

7 11

A lambda and boost function problem. Can any one with kindness help me?
by fmingu 25 Jul '09

25 Jul '09

I am using Dev-C++ 4.9.8.0 and lambda expression. I builded a class and put it into a dll made by myself. The dll will be used by else's programs which contain the functions that I do not know. All I know is just the function type.So I used the boost function library. ............ class classA{ ................. public: boost::function<double (const int& )> theunknownfunc; ........................ and a member function in classA used such function: double classA::function1( int& q, const int& n){ double result=0.0; int loopvalue=1, totaltime=thenumbern; int innern=1; ( for_loop(var(loopvalue)=1,var(loopvalue)<=var(totaltime),++var(loopvalue), (var(result)+= ( bind(&classA::theunknownfunc,this,_2)*bind(&classA::function2,this,_1,_2)), ++_2,_2%=_1))) (q,innern); return result; } ................. but the complier told me that: instantiated from `RET boost::lambda::lambda_functor_base<boost::lambda::forloop_action, Args>::call(A&, B&, C&, Env&) const [with RET = void, A = int, B = int, C = const boost::tuples::null_type,<............. instantiated from `T::sig<boost::tuples::tuple<A&, B&, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, .............. instantiated from here The user do not want to read the source code of mine since it is built with many lambda expressions. He just want to use the dll. And I do not know how to solve it by using boost function library. Can anyone with kindness help me?

2 1

[filesystem] Strange seg.faults of boost::filesystem under ElectricFence
by Pavel Shevaev 25 Jul '09

25 Jul '09

Folks, I'm trying to spot a memory corruption error in my application using ElectricFence[1] and I'm facing really weird segfaults in boost::filesystem. I don't really believe it is boost::filesystem which causes a seg.fault but rather my improper usage of ElectricFence. Here is the most interesting part of the core dump: #0 0x00007f2b4aa1c517 in kill () from /lib/libc.so.6 #1 0x000000000048f46b in on_signal (s=4) at main.cpp:180 #2 <signal handler called> #3 0x00007f2b4aa1c517 in kill () from /lib/libc.so.6 #4 0x00007f2b4b4e746f in ?? () from /usr/lib/libefence.so.0 #5 0x00007f2b4b4e8290 in _eff_deallocate () from /usr/lib/libefence.so.0 #6 0x00007f2b4b4e884e in _eff_allocate () from /usr/lib/libefence.so.0 #7 0x00007f2b4b4e7288 in operator new () from /usr/lib/libefence.so.0 #8 0x00007f2b4b27d711 in std::string::_Rep::_S_create () from /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.3/libstdc++.so.6 #9 0x00007f2b4b27e0d5 in ?? () from /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.3/libstdc++.so.6 #10 0x00007f2b4b27e213 in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string () from /usr/lib/gcc/x86_64-pc-linux-gnu/4.3.3/libstdc++.so.6 #11 0x00007f2b4cbaa81e in boost::filesystem::detail::dir_itr_first () from /home/game/hg/master_49100/shared/scripts/../lib/boost/build/lib/libboost_filesystem-mt.so Basically the following line in my app cases the seg.fault: boost::filesystem::directory_iterator dir_iter(path); Inspecting path variable under gdb shows it's ok and actuall directory exists. Here is some information about my application: * built with gcc-4.3.3 * runs under linux-2.6.29-gentoo * uses boost-1.35 * boost is built with options: ./bjam link=shared --build-type=minimal --layout=system --toolset=gcc * ElectricFence built from gentoo package efence-2.4.13-r1 The question is whether there are any special boost build options which should be used with ElectricFence. Thanks in advance. [1]http://www.pf-lug.de/projekte/haya/efence.php -- Best regards, Pavel

2 2

Help with updating PowerDNS to boost for easier windows compilation
by Todd Nine 25 Jul '09

25 Jul '09

Hi all, I'm in the process of updating the 2.9.22 source of PowerDNS to be a bit more "Windows Friendly" and building it with Visual C++ 8 (2008). However, I'm having some issues I could use a hand with. Specifically, the authors of powerdns define their own following types #ifdef NEED_POSIX_TYPEDEF typedef unsigned char uint8_t; typedef unsigned short int uint16_t; typedef unsigned int uint32_t; typedef unsigned long long uint64_t; #endif These types are used extensively in the code. Rather than prefix each reference with the boost:: namspace, I would like to make boot the standard namespace for these data types. Everything includes the header file with the definition above, is there a way for me to do this? I haven't done C and C++ in 9 years, and even then only on very small projects and small patches, so your help is greatly appreciated. Thanks, todd SENIOR SOFTWARE ENGINEER todd nine | spidertracks ltd | 117a the square po box 5203 | palmerston north 4441 | new zealand P: +64 6 353 3395 | M: +64 210 255 8576 E: todd(a)spidertracks.co.nz W: www.spidertracks.com

2 1

FREE debugger
by Caligula 24 Jul '09

24 Jul '09

Can anyone recommend a FREE debugger to use for boost, under linux. I want to see if I can fix copy_graph to my liking. I'm used to using the gdb debugger, but I think there must be something better. Thanks -Caligula

3 2

UTF-16
by Robert Dailey 24 Jul '09

24 Jul '09

Hi everyone, I did a bit of googling to see if Boost 1.39 as any portable support for UTF-16 encoded strings, but I did not find any. I'm currently using wxWidgets in my application, and I need a decent string object to use. I know that wxWidgets has UTF-16 string support through wxString, however I do not want to expose this object in my interfaces. I want to remain as abstracted away from wxWidgets as possible. Having said that, if someone could tell me if there is any existing UTF-16 string support in Boost, I'd appreciate it. I did not find anything in the vault, sandbox, or trunk in Boost. If boost has no such string object, could someone give me a head start on where to look? Thanks.

9 15

[Signals] Another performance discussion
by Sajjan Kalle 24 Jul '09

24 Jul '09

Hi, I see that there's already been some discussion concerning the performance of the signals library, it's fairly old though so I hope nobody minds me brining it up in a new thread. We use signals fairly extensively and have seen it coming in fairly high in our profiling sessions. I did a search on the mailing list and found a discussion from 2005 on the performance of the library, results at that time showed a vector with boost::function being about 100 times faster than boost::signals. Our tests shows that this still very much holds true. I suspect there difference is considerably worse on in order RISC processors. I think it would be nice if either the manual states that performance isn't one of the design goals of boost::signals, or that the interface allows the application programmer greater controll over implementation details which affects performance. I saw in one discussion going ( although once again, an old one ) that boost::signals use list as the container of slots instead of for example vector. This is understandable for the general case since otherwise connecting / disconnecting slots would be very expensive on large collections. However one use case which I'd think is very very frequent ( which resembles ours ), is to have fairly few slots connected and a somewhat constant collection, in this case one would rather have the expensive connection management and instead have the better cache locality and invocation performance. Blocking / unblocking slots is another feature which while useful for a lot of people perhaps should be optional. I don't know exactly how blocking / unblocking slots are implemented, but perhaps simply an added iterator which doesn't respect the blocked status could be easily added and a matching slot invocation function.

4 15

Intel Compiler 11 and Boost 1.39 Bessel functions
by Matthieu Brucher 24 Jul '09

24 Jul '09

Hi, I've tried this code with Boost 1.39 (1.37 has the same behavior) and icpc 11.0.083: #include <iostream> #include <boost/math/special_functions/bessel.hpp> int main(int argv, char** argc) { std::cout << boost::math::cyl_bessel_i(0, 0) << std::endl; } With -g -03, this crashes with an internal error. The issue was reported to Intel (but if you have a solution, I'm all ears). Matthieu -- Information System Engineer, Ph.D. Website: http://matthieu-brucher.developpez.com/ Blogs: http://matt.eifelle.com and http://blog.developpez.com/?blog=92 LinkedIn: http://www.linkedin.com/in/matthieubrucher

3 10

Using boost library on MacOSx
by Richard L. Aurbach 24 Jul '09

24 Jul '09

On Jul 24, 2009, at 10:30 AM, boost-users-request(a)lists.boost.org wrote: > I have install boost library using this: > $ sudo port install boost > It seems download and compile fine on my local machine. > > But then i tried to compile a simple echo client example from > http://www.boost.org/doc/libs/1_35_0/doc/html/boost_asio/examples.html > > I get a bunch of compiler errors. I am using "g++ -o block_client > blocking_udp_echo_client.cpp " > > Here are some of the errors: > $ g++ -o block_client blocking_udp_echo_client.cpp > blocking_udp_echo_client.cpp:68:10: error: #include expects "FILENAME" > or <FILENAME> > blocking_udp_echo_client.cpp:69:10: error: #include expects "FILENAME" > or <FILENAME> > blocking_udp_echo_client.cpp:70:10: error: #include expects "FILENAME" > or <FILENAME> > blocking_udp_echo_client.cpp:71:10: error: #include expects "FILENAME" > or <FILENAME> > blocking_udp_echo_client.cpp:83: error: stray ‘\’ in program > blocking_udp_echo_client.cpp:108: error: stray ‘\’ in program > blocking_udp_echo_client.cpp:112: error: stray ‘\’ in program > > Thank you for any help. From my experience building software on MacOSX, I suspect that the problem is that you have not correctly defined an environment variable or something like that. If you write a line like "#include <boost/ blah>" and the compiler either cannot correctly resolve 'boost' or if the symbol resolves in such a way that an invalid file specification is created, then you might get the kind of error message that you are seeing. Another possibility -- if you have code left over from Windoze, look for backslashes in file specs. MacOSX is a Unix-like system that requires SLASHES, not BACKSLASHES. So lines line "#include <boost \header.h> will NOT work. Cheers, Rick Aurbach, Ph.D. President and Chief Engineer Aurbach & Associates, Inc. 8233 Tulane Avenue, Suite B St. Louis, MO 63132 www: http://www.aurbach.com/ eMail: support(a)aurbach.com [business] rick(a)aurbach.com [personal] Fax: 314/678-0869 Phone: 800/774-7239 314/726-1321 "Cowardice asks the question, 'Is it safe?' Expediency asks the question, 'Is it politic?' Vanity asks the question, 'Is it popular?' But, conscience asks the question, 'Is it right?' And there comes a time when one must take a position that is neither safe, nor politic, nor popular but one must take it because one's conscience tells one that it is right." -Martin Luther King, Jr. "If in the last few years you haven't discarded a major opinion or acquired a new one, check your pulse. You may be dead." - Gelett Burgess (1866-1951) "A life spent making mistakes is not only more honorable, but more useful than a life spent doing nothing." - George Bernard Shaw (1856-1950)

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Re: [Boost-users] boost 1.39 serialization via base pointer ok on gcc, but crashes on AIX V10.1
by Avi Bahra 24 Jul '09

24 Jul '09

Ok first I hadn't realised my attachment was removed. So I include the source code below. This is small and self contained. o The compile error on AIX was removed because I saving via a non const variable. ( Note however gcc 4.2.1. on Linux it did not complain.) o To recap this compiles and runs on Linux with gcc 4.2.1 but crashes/exception on AIX V10.1. Because it reckons the derived/base relationship has not been registered. ... oserializer.hpp // convert pointer to more derived type. if this is thrown // it means that the base/derived relationship hasn't be registered vp = serialization::void_downcast( *true_type, *this_type, static_cast<const void *>(&t) ); if(NULL == vp){ boost::serialization::throw_exception( >>>> archive_exception(archive_exception::unregistered_cast) ); } Note if a save via the derived ptr, then it works. o If I explicitly register this relationship, (see code below) Then I get past the first exception only to get an assert. // since true_type is valid, and this only gets made if the // pointer oserializer object has been created, this should never // fail const basic_pointer_oserializer * bpos = archive_pointer_oserializer<Archive>::find(* true_type); >>> assert(NULL != bpos); if(NULL == bpos) boost::serialization::throw_exception( archive_exception(archive_exception::unregistered_class) ); ar.save_pointer(vp, bpos); o Initially I thought it was compiled without rtti on AIX. However this was not the case. Here is compile line. xlC -c -DDEBUG -qcpluscmt -qNOOPTimize -qnoinline -g -qfullpath -qfuncsect -qeh -qrtti -qtemplatedepth=700 -I"../SCRATCH/src" -I"/s1a/emos_esuite/emos_data/sms/boost_1_39_0" -o "bin/vacpp/debug/src/TestSerialisation.o" "src/TestSerialisation.cpp" This is show stopper bug that I must get fixed. Are there any more things I can try to debug this ? Any help would be much appreciated. //=============== the example ======================== #include <fstream> #include <assert.h> #include <boost/archive/text_iarchive.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/string.hpp> #include <boost/serialization/export.hpp> class RepeatBase { public: RepeatBase() {} virtual ~RepeatBase() {} virtual const std::string& name() const = 0; private: friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) {} }; class RepeatDerived : public RepeatBase { public: RepeatDerived( const std::string& name) : name_(name) {} RepeatDerived() {} virtual const std::string& name() const { return name_;} private: std::string name_; friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { // save/load base class information ar & boost::serialization::base_object<RepeatBase>(*this); ar & name_; } }; class Defs { public: Defs(const std::string& f) : fileName_(f), repeat_(new RepeatDerived(f)) {} Defs() : repeat_(NULL) {} ~Defs() { delete repeat_;} bool operator==(const Defs& rhs) const { return fileName_ == rhs.fileName_;} const std::string& fileName() const { return fileName_;} private: std::string fileName_; RepeatBase* repeat_; friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int /*version*/) { ar & fileName_; ar & repeat_; } }; BOOST_CLASS_EXPORT(RepeatBase); BOOST_CLASS_EXPORT(RepeatDerived); BOOST_SERIALIZATION_ASSUME_ABSTRACT(RepeatBase) int main() { // With this explicit register, we get a bit further, but still crashes on AIX // boost::serialization::void_cast_register<RepeatDerived, RepeatBase>(0,0); const Defs saveDefs("saveFile.txt"); { // Save the defs file std::ofstream ofs( saveDefs.fileName().c_str() ); boost::archive::text_oarchive oa( ofs ); oa << saveDefs; // BOMBS out here on AIX V10.1 } { // Restore the defs file Defs loadDefs; std::ifstream ifs(saveDefs.fileName().c_str()); boost::archive::text_iarchive ia(ifs); ia >> loadDefs; assert( saveDefs == loadDefs ); } return 0; } //=============================================== Best regards, Ta, Avi

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Problem with boost::interprocess:basic_string : Error address out of bounds
by samuel.gallard 24 Jul '09

24 Jul '09

Hello, I first present to you my code and I will explain later : ShmString.h : #include #include #include namespace ip=boost::interprocess; typedef ip::allocator CharAllocator; class ShmString : public ip::basic_string, CharAllocator > { public: ShmString (); virtual ~ShmString (); private: /** * The segment to build the string */ static ip::managed_shared_memory* st_segment; } This class served to have some string in memory. The following Element.h used it : #include "ShmString.h" class Element { public: Element (const Element& elem); Element (const std::string dir, const std::string file, const std::string type, const std::string newpath, const std::string newfile, ip::managed_shared_memory * segment); virtual ~Element (); private: ShmString dir; ShmString file; ShmString target; ShmString type; ShmString newpath; ShmString newfile; }; I have four attributes that declare it. When I tried to define all the attributes in the constructor like this in Element.cpp : Element::Element (const string dir, const string file, const string type, const string newpath, const string newfile, ip::managed_shared_memory *segment){ try{ this->segment = segment; //test the type if(type == Request::st_rename){ this->type.assign(type.c_str()); } else{ string res = "Class Element in constructor -> The type should be : rename "; throw EventException(res.c_str(), __LINE__ ); } this->dir.assign(dir.c_str()); this->file.assign(file.c_str()); this->target.assign(""); this->newfile.assign(newfile.c_str()); this->newpath.assign(newpath.c_str()); } catch(ip::interprocess_exception &e){ ostringstream oss; const std::string what(e.what()); oss << "Class Element in constructor 3 -> "; oss << what; throw EventException(oss.str().c_str(), __LINE__ ); } } If for example "const string dir " has the size more than 10 (the capacity by default for a ShmString object), I obtained an error like this : 0x0807439f in boost::interprocess::basic_string, boost::interprocess::allocator, 0u>, boost::interprocess::iset_index> > >::assign (this=0xb6c4e274, s=0xb8af42d0 ) at /usr/local/include/boost/interprocess/containers/string.hpp:988 #3 0x08071d26 in Element (this=0xb6c4e26c, elem=@0xb7fa224c) at ..Element.cpp:22 I tried to used some other constructors be default for basic_string but it remains the same. This code only works when in the constructors the string size are below 10. Could you someone explain me why I obtain this? Do I have some faulty code? Could you provide some examples on how store string with interprocess::basic_string in share memory for a size for more than 10 characters? I will be very grateful because I am lost... Thanks you in advance Regards Samuel -- View this message in context: http://www.nabble.com/Problem-with-boost%3A%3Ainterprocess%3Abasic_string-%… Sent from the Boost - Users mailing list archive at Nabble.com.

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Alternative to bjam threading=multi
by Avi Bahra 24 Jul '09

24 Jul '09

On AIX I want to compile with multi-threading, then means using xlC_r. Using bjam threading=multi Will do this. However is there a way achieving the same effect without putting "threading=multi" on the command line ? i.e putting the threading model in site-config.jam In my site-config.jam , have tried the following, all to no avail *using* xlc : : xlC_r ; using vacpp : : <threading>multi ; using vacpp : xlC_r ; Best regards, Ta, Avi

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[Asio] How can you detect port collsions?
by Robert Jones 24 Jul '09

24 Jul '09

Hi All Thanks to those of you who have answered my previous asio queries - I'm gradually gaining on the problems! I am allocating port numbers on tcp connections dynamically, and must allocate and reserve the port number without blocking. I also have multiple instances of the process which needs to do this, and I'm plagued by port collisions. How do I detect, and avoid, port number collsions? Thanks, Rob.

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[boost-users][bind] type of boost::bind
by Sakharuk, Vlad (GMI Development) 24 Jul '09

24 Jul '09

Here is example: struct a{ int foo(bool){ return 0; } }; boost::function1<int, void> func = bind(&a::foo,_1,false); a somea; func(somea); Is it possible to get a bind type? Something like: boost::mpl::identity<boost::bind<int,void,boost::arg<1>,a> >::type abind; Thanks Vlad. -------------------------------------------------------------------------- This message w/attachments (message) may be privileged, confidential or proprietary, and if you are not an intended recipient, please notify the sender, do not use or share it and delete it. Unless specifically indicated, this message is not an offer to sell or a solicitation of any investment products or other financial product or service, an official confirmation of any transaction, or an official statement of Merrill Lynch. Subject to applicable law, Merrill Lynch may monitor, review and retain e-communications (EC) traveling through its networks/systems. The laws of the country of each sender/recipient may impact the handling of EC, and EC may be archived, supervised and produced in countries other than the country in which you are located. This message cannot be guaranteed to be secure or error-free. References to "Merrill Lynch" are references to any company in the Merrill Lynch & Co., Inc. group of companies, which are wholly-owned by Bank of America Corporation. Securities and Insurance Products: * Are Not FDIC Insured * Are Not Bank Guaranteed * May Lose Value * Are Not a Bank Deposit * Are Not a Condition to Any Banking Service or Activity * Are Not Insured by Any Federal Government Agency. Attachments that are part of this E-communication may have additional important disclosures and disclaimers, which you should read. This message is subject to terms available at the following link: http://www.ml.com/e-communications_terms/. By messaging with Merrill Lynch you consent to the foregoing. --------------------------------------------------------------------------

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[MPI] Serializing a class with a string data member
by Mathieu Larose 23 Jul '09

23 Jul '09

Hello, I'm trying to register a class (named A), because it will be a derived class. Calling BOOST_CLASS_EXPORT(A) will generate a lot of errors that look similar. Here is one of them: /usr/local/include/boost/mpi/datatype.hpp:184: error: no matching function for call to ‘assertion_failed(mpl_::failed************ boost::mpi::is_mpi_datatype<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >::************)’ Here is the code: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - #include <iostream> #include <boost/mpi.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/mpi/packed_oarchive.hpp> #include <boost/mpi/packed_iarchive.hpp> #include <boost/serialization/export.hpp> #include <boost/serialization/string.hpp> class A { friend class boost::serialization::access; template<class Archive> void serialize(Archive & ar, const unsigned int version) { ar & _text; } }; BOOST_CLASS_EXPORT(A); // I need to export A, because I will use // abstract base pointer. A is not a derived // class for simplicity here. int main(int argc, char * argv[]) { return 0; } - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - I've found that someone had the same problem ( http://groups.google.com/group/boost-list/msg/c9a0c133bddd783d ), but no solution was found. What am I doing wrong? Thanks, Mathieu Larose

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[BGL] Converting between adjacency_list with listS and vecS
by Ethan Kim 23 Jul '09

23 Jul '09

Hi all, The long standing question I've had for BGL is how to easily convert a graph (using adjacency_list) from listS as vertex list to vecS. (And vice versa) I understand why there needs to be 2 different implementations depending on different uses of algorithms. But is there an easy way to convert them back and forth? Any tip would be much appreciated. Thanks,

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[Thread] Interruption Feature
by Timothy 23 Jul '09

23 Jul '09

Hi, I want to write a signal handler for SIGINT that notifies the main() thread to break out of a loop and exit. I was thinking of using Boost.Thread's interruption feature. Does it support this usage, or do I need to use some other way to do this? Thanks in advance. Tim

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Other tcp stream examples? suggestion about asio examples... Re: usage of boost::asio::async_write and boost::asio::buffer
by Ozgur Ozturk 23 Jul '09

23 Jul '09

Hi All, Thanks to Igor's pointing to streambuf I realized availability of stream operations. I think for many newbies, stream examples would be easier to understand/reuse. I found the very simple daytime_client and daytime_server examples useful. (Examples could be reordered to start with simpler ones.) Are there any other asio examples using streams? If the contributors could add stream versions of chat server and client examples that would be great. I guess using streams is somewhat less efficient, is that correct? (since you have more control on the buffer without streams.) Best regards, Ozgur (Oscar) Ozturk www.DrOzturk.com Phone: +1 (908) DROZGUR i.e, +1 (908) 376-9487 On Tue, Jul 21, 2009 at 4:28 PM, Igor R <boost.lists(a)gmail.com> wrote: > > I tried to use the same string as buffer for both async_read_some and > async_write > > Who will allocate the buffer for the read operation? socket's > async_read_some() doesn't know to do this alone. > > > I guess the string can not be treated as a mutable buffer, so maybe I > should > > keep the original char * buffer for async_read_some and use the string > only > > for outputting with async_write. Is that right? > > (or any other recommendation?) > > Why wouldn't you use asio::streambuf? You've a set of functions that > async.read/write from/to it, and it grows automatically. You can see > relevant examples in asio docs. > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

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