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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.

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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--

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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

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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

1 0

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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[Preprocessor] Is it possible to expand recursively?
by TONGARI 19 Jul '11

19 Jul '11

Hello, I'd like to have a macro like: BUILD_HIERARCHY (a, (b,) (c, (d,) (e,) ) ) which should expand to: struct a {}; struct b: a {}; struct c: a {}; struct d: c {}; struct e: c {}; Is this possible at all? I have tried but with no luck, if this is impossible, please tell me so. TIA

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[spirit] warnings after upgrade to 1.47
by Diederick C. Niehorster 19 Jul '11

19 Jul '11

Dear all, After upgrading to boost 1.47, I got the attached enormous warning, ironically saying that names are too long, for a very simple use of boost.spirit. Code: #include <string> #include <vector> using namespace std; #include <boost/spirit/include/karma.hpp> namespace bsk = boost::spirit::karma; namespace bsa = boost::spirit::ascii; vector<string> vUnrecog; //... bsk::generate(ostream_iterator<char>(cout), "Init file options not recognized:\n" << (" \"" << bsa::string << '"' << bsk::eol) % "", vUnrecog); Is there something I am doing suboptimally or in an old way? (The code has been around for about 2 years now). Thanks and best, Dee

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Asio 1.6: compile error in signal_set_service with MSVC10
by Norbert Wenzel 19 Jul '11

19 Jul '11

Hi, I was just updating Boost from 1.46.1 to 1.47 and encountered a compile error inside Asio. Since there is no major outcry on this list I guess I've made an error anywhere in the upgrade process or my code. When compiling my static library that contains the networking code with (our only compiler) Visual Studio 2010 I get compile errors in asio/detail/impl/signal_set_service.ipp in line 74 saying 'boost::signal': use of class template requires template argument list As a remedy I simply defined BOOST_ASIO_DISABLE_SIGNAL, the code compiles fine and I did not recognize any problems at a first short test. I tried to make a simple example showing the error, but I was not able to reproduce this easily. So I thougt I ask what disabling signals means for Asio and if this is a valid workaround, or if I really should try to get this compile error fixed before working with 1.47. thanks, Norbert

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[fusion] adapt std::tuple to be a fusion sequence?
by Nathan Ridge 19 Jul '11

19 Jul '11

Hello, Is it possible to adapt std::tuple to be a fusion sequence? I'm thinking it may be possible to do it for a specific number of elements using BOOST_FUSION_ADAPT_TPL_ADT, but I haven't tried. Is there some functionality like this already in fusion? Thanks, Nate.

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Boost::Asio SSL Handshake - Payload in TDS package
by Andi Clemens 19 Jul '11

19 Jul '11

Hi, I need to parse TDS packages that contain SSL as their payload. For example the TDS package type 0x12 (PreLogin) will have the SSL handshake as its payload. Can I extract this payload and somehow tell Boost::Asio to use this data for an SSL handshake (async_handshake)? Andi

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What result_type ? And why?
by John M. Dlugosz 19 Jul '11

19 Jul '11

I wrote the following functor: struct ASCII_lower { template< typename CharT > CharT operator() (const CharT& ch) const { if (ch >= 'A' && ch <= 'Z') return ch+0x20; return ch; // unchanged } }; and when I used it to create a transformed_range, I get an error that it doesn't find result_type in ASCII_lower. Since the return type depends on the argument, how could I declare a result_type? And why do I need it? Lambda functions don't have it, and I thought it was fairly old fashioned and optional for helping figure out the result type if necessary.

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invalid conversion from 'bool
by Eric Lin 19 Jul '11

19 Jul '11

Dear Advanced c/g++ on boost programers: I have copied and testd a simple (Copy a file with Boost) program from page 372, Example10-10, book(C++ cookbook) but I got compile error ----------------------------- eric@eric-laptop:~/cppcookbook/ch10$ g++ Example10-10.cpp Example10-10.cpp: In function ‘int main(int, char**)’: Example10-10.cpp:17:47: error: invalid conversion from ‘bool (*)(const std::string&)’ to ‘boost::enable_if_c<true, void>::type*’ Example10-10.cpp:17:47: error: initializing argument 2 of ‘boost::filesystem3::path::path(const Source&, typename boost::enable_if<boost::filesystem3::path_traits::is_pathable<typename boost::decay<Source>::type> >::type*) [with Source = char*, typename boost::enable_if<boost::filesystem3::path_traits::is_pathable<typename boost::decay<Source>::type> >::type = void]’ Example10-10.cpp:18:47: error: invalid conversion from ‘bool (*)(const std::string&)’ to ‘boost::enable_if_c<true, void>::type*’ Example10-10.cpp:18:47: error: initializing argument 2 of ‘boost::filesystem3::path::path(const Source&, typename boost::enable_if<boost::filesystem3::path_traits::is_pathable<typename boost::decay<Source>::type> >::type*) [with Source = char*, typename boost::enable_if<boost::filesystem3::path_traits::is_pathable<typename boost::decay<Source>::type> >::type = void]’ Example10-10.cpp:18:48: error: expected ‘)’ before ‘;’ token ----------------------------- This is my program, you can download and test by your self from http://examples.oreilly.com/9780596007614/ ----------------------------------------------------- // Example 10-10. Copying a file with Boost #include <iostream> #include <string> #include <boost/filesystem/operations.hpp> #include <boost/filesystem/fstream.hpp> #include <boost/filesystem/path.hpp> using namespace std; using namespace boost::filesystem; int main(int argc, char** argv) { // Parameter checking... try { // Turn the args into absolute paths using native formatting path src = complete(path(argv[1], native)); path dst = complete(path(argv[2], native); copy_file(src, dst); } catch (exception& e) { cerr << e.what() << endl; } return(EXIT_SUCCESS); } ---------------------------------------------------------------------------- I ever check around web, there is some suggestion ask me to get rid native, but in my test/system, it only generate more errors. my boost version probably is 1.46.1 and I am on g++ 4.5.2 and Ubuntu10.04/linuxKernel2.6.35-25 Need and thanks your help a lot in advance, Eric

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Boost.Iterator and future standards?
by John M. Dlugosz 19 Jul '11

19 Jul '11

The documentation for Boost.Iterator says "Both iterator_facade and iterator_adaptor as well as many of the specialized adaptors <http://www.boost.org/doc/libs/1_46_1/libs/iterator/doc/index.html#specializ…> mentioned below have been proposed for standardization, and accepted into the first C++ technical report" But I don't see that in <http://www.boost.org/doc/libs/1_46_1/doc/html/boost_tr1.html> or notice anything concerning them in other TR1 writeups. Can someone clarify the situation?

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[icl] possible bug for set difference
by Thomas Taylor 18 Jul '11

18 Jul '11

Hi! First let me express my happiness for having this library, as it makes a lot of my programming tasks much easier! While using it I think I discovered a bug for interval_set, when a difference is calculated; please find a test case attached. This was compiled against recent svn (r73190). cheers, Thomas

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Boost.Log
by asif saeed 18 Jul '11

18 Jul '11

Hi, What is the status of Boost.Log? Is operating system log (e.g. Windows Event Log, Unix's Syslog) supported? If logging via OS is not supported then how it can be implemented, would you please give me a link or some examples/guidelines? Best, Asif

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[Rational] "r.den > zero" assertion failure
by Pierre Cagne 18 Jul '11

18 Jul '11

Hi, I'm having a weird dynamic failure using Boost.Rational. Using some rationals and doing a calculus, i'm ending with a rational with a negative denominator, and so unusable for comparison (hence the r.den > 0 assertion failure during the execution). More precisely, here is a piece of code : (with typedef boost::rational<mpz_class> rat) std::cout << xa << " " << ya << " " << xb << " " << yb << " " << xc << " " << yc << " " << xd << " " << yd << std::endl; // determinant rat delta = (xb - xa)*(yc - yd) - (yb - ya)*(xc - xd); std::cout << "Delta : " << delta << std::endl; /* ... some comparisons on delta ...*/ For the following result : 0/1 1/4 1/2 0/1 0/1 0/1 1/1 0/1 Delta : 1/-4 Assertion failed: (r.den > zero), function operator<, file /usr/local/include/boost/rational.hpp, line 388. How does it come that Boost does not maintain the assertion correct ? I precise that the same code with the type boost::rational<int> does not produce the failure. Thankfully. P.S. : i'm new on this mailing-list ; does my message match with the common pattern of this list ? -- Pierre Cagne pierre.cagne(a)gmail.com

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in the makefile, how to find/configure boost lib path and include path on different machines?
by deqiang sun 17 Jul '11

17 Jul '11

Hi all, I am writing a small program depending on boost libs. However, my work environment unfortunately includes many computers with boost installed on different locations. In such scenario, how should I write the makefile to make it correctly include headers and link to libs? Thanks very much, DSUN

1 0

exception problem with boost::filesystem under cygwin
by Kraus Philipp 17 Jul '11

17 Jul '11

Hello, I'm using boost::filesystem within my project (boost 1.47.0). I have compiled the boost under cygwin with bjam. I have some problems with exception throws / catches: The following example shows the problem: #include <stdexcept> #include <boost/filesystem.hpp> int main(int argc, char* argv[]) { throw std::runtime_error("xxx"); return 0; } If I compile this code under Cygwin and link cygboost_filesystem and cygboost_system, the programs terminates with this messages: terminate called after throwing an instance of 'std::runtime_error' terminate called recursively If I remove the boost/filesystem include the program produce the correct message: terminate called after throwing an instance of 'std::runtime_error' what(): xxx If I change the program to: int main(int argc, char* argv[]) { try { throw std::runtime_error("xxx"); } catch (...) {} return 0; } the program breaks down with the filesystem include: terminate called after throwing an instance of 'std::runtime_error' terminate called recursively without the include always works fine. Can anyone help me to solve the problem? Thanks a lot Phil

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[fusion] BOOST_FUSION_DEFINE_STRUCT at class scope
by Nathan Ridge 17 Jul '11

17 Jul '11

Hello, The documentation of BOOST_FUSION_DEFINE_STRUCT says it should be used at global scope. Why can't this function be used at namespace scope, and, especially, at class scope? Not being able to use it at namespace scope is just as annoyance because it means the current namespace(s) have to be closed before the macro and re-opened after it; but not being able to use it at class scope means that it cannot be used to declare nested structures which are fusion sequences at all. Is there another device that allows us to declare nested structure that are fusion sequences? Thanks, Nate.

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[Review] Type Traits Introspection library by Edward Diener starts tomorrow Friday 1
by Joel Falcou 17 Jul '11

17 Jul '11

According to the schedule, review for the Type Traits Introspection library by Edward Diener starts this friday and run till July 10th. =========== 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/ Note that this repository will be updated up to next thursday by Edward. =================== 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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[serialization] writing private variables
by Sean Farrow 16 Jul '11

16 Jul '11

Hi: Is there a way to tell the serialization library to write private members. The members do have functions to get/set there values, but as far I know the serialization subsystem doesn't call these. Cheers Sean.

2 1

[Pool] Attention all Pool users....
by John Maddock 16 Jul '11

16 Jul '11

Folks, I'm planning on merging the all new and shiny version of Boost.Pool in the sandbox under https://svn.boost.org/svn/boost/sandbox/guild/pool/ into Trunk pretty soon unless anyone objects. There are a lot of bug fixes in this version, plus updated docs (see https://svn.boost.org/svn/boost/sandbox/guild/pool/libs/pool/doc/pool.pdf) Please let me know if you spot any issues, or if there's something that needs addressing that hasn't been (no promises on that one though!). Regards, John.

1 0

Sharing a complex object between two processes: Suggestions needed
by Nathan Lewis 15 Jul '11

15 Jul '11

Thanks so much for a great C++ library, Last night I read the complete archive looking for some tidbits of info to help me figure out how to move forward with a decision of the appropriate approach. I am fairly new to boost so I am hoping someone has some advice for my situation. I am trying to share instances of a c++ class that is auto-generated from xml schema. I am trying to hand this class off from a dll that a web service engine loads to another application for processing. This class is an in-memory implementation of the class and contains several objects which contain a lot of native stl c++ strings as well as other primitive types. I was hoping to use boosts circular buffer in shared memory, but began prototyping with a vector it and researching and I realized that the strings put in shared memory must use the basic_string construct. Having some concern about going through all of the auto generated code to change all of these types and concern over what affect that might have on the dll & service engine operation. I've seen some examples using shared memory that use the void allocator and thought maybe that is what I need to do, however I keep getting back to the fact that I've got a bunch of strings in this composite class and I don't know if that is torpedoing my attempts. I've seen there are many interprocess constructs, memory mapped regions, shared_ptrs and message ques etc. I also recently got to thinking that perhaps I should look at boost serialize to deal with the strings. I didn't want to leave the boost interprocess approach if there was some way to exchange instances of this class correctly using one of boost interprocess constructs. What I am hoping is that some could chime in with suggestions on different ways to use boost to achieve this and I'll try and go off and research it. Your input is greatly appreciated!

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[multi-array] Extracting dimension information from a multi-array
by Ryan McConnehey 15 Jul '11

15 Jul '11

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Re: [Boost-users] [Serialization] Writing an old version of a class
by Richard L. Aurbach 15 Jul '11

15 Jul '11

Don, I can't speak to what support is present in boost serialization, but I have a lot of code that needs to deal with multiple versions of classes or data structures. I've found that the best way to deal with that is to store a version number as a data member and then handle the schema evolution internally in the class. In general, it is the responsibility of a class to handle older versions "appropriately" whatever that means to you in your context. If the version number is the FIRST data member of the class (in an I/O or serialization context), then you can easily write code to handle multiple versions during I/O and/or serialization. Just my $0.02. Cheers, Rick Aurbach Aurbach & Associates, Inc. On Jul 15, 2011, at 11:00 AM, boost-users-request(a)lists.boost.org wrote: > From: Don <dm413-boost(a)intielectronics.com> > Date: July 15, 2011 7:27:07 AM CDT > To: "boost-users(a)lists.boost.org" <boost-users(a)lists.boost.org> > Subject: [Boost-users] [Serialization] Writing an old version of a class > Reply-To: "boost-users(a)lists.boost.org" <boost-users(a)lists.boost.org> > > > 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

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The last (I think) of the Boostcon videos
by Marshall Clow 15 Jul '11

15 Jul '11

Chris' talk: Why C++0x is the Awesomest Language for Network Programming http://blip.tv/boostcon/why-c-0x-is-the-awesomest-language-for-network-prog… Luke's: Sweep-Line Algorithm for Voronoi Diagrams of Points, Line Segments and Medial Axis of Polygons in the Plane http://blip.tv/boostcon/sweep-line-algorithm-for-voronoi-diagrams-of-points… Boris: Boost.Process: Process management in C++ http://blip.tv/boostcon/boost-process-process-management-in-c-5368233 Joel's: Getting Jiggy with Proto — Hands-on Tutorial on C++ EDSL Design http://blip.tv/boostcon/getting-jiggy-with-proto-hands-on-tutorial-on-c-eds… Boris' other one: A Complete Overview on Boost.Jam and Boost.Build http://blip.tv/boostcon/a-complete-overview-on-boost-jam-and-boost-build-53… I think that this is all the Boostcon videos. I'll be checking later to make sure - but if you know of one that I've missed, then please let me know. BTW, Ruediger asked not to have his "Funding Boost development" talk recorded, and I didn't record any of the workshops. -- Marshall -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki

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[TTI] Review Going On
by Joel Falcou 15 Jul '11

15 Jul '11

A small reminder to ask potential reviews for Edward Diener's TTI Library to do so as we are heading to the end of the review period on the 17 july. If you have comments, questions or just want to submit a review, feel free to do so.

1 0

Problem when compiling with 1.47 on Mac OS X 10.6.8
by Frank Astier 15 Jul '11

15 Jul '11

must have done something very silly, but code that used compiled fine now gives me: g++ -gfull -Wall -Werror -fexceptions -DDEBUG_TP -Ddarwin86 -I./ -Itp_datastruct/ -Iutil/ -I/usr/local/include -I/Users/frank/Sandbox/work -c -o objs/Profile.o tp_datastruct/Profile.cpp In file included from /usr/local/include/boost/type_traits/is_class.hpp:16, from /usr/local/include/boost/type_traits/is_abstract.hpp:55, from /usr/local/include/boost/type_traits/is_convertible.hpp:25, from /usr/local/include/boost/type_traits/is_enum.hpp:19, from /usr/local/include/boost/type_traits/is_signed.hpp:15, from /usr/local/include/boost/type_traits/make_unsigned.hpp:14, from /usr/local/include/boost/lexical_cast.hpp:33, from tp_datastruct/AttributeValue.h:13, from tp_datastruct/Profile.h:10, from tp_datastruct/Profile.cpp:3: /usr/local/include/boost/type_traits/is_union.hpp:38: error: expected primary-expression before ')' token /usr/local/include/boost/type_traits/is_union.hpp:38: error: a function call cannot appear in a constant-expression Any idea?? fastier(a)yahoo.com Frank fastier(a)yahoo.com

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[GIL] Loading flipped image
by Szymon Gatner 15 Jul '11

15 Jul '11

Hi, Is it possible to flip image while it is being loaded? Png images are loaded upside-down and I currently I use copy_pixels() on flipped_up_down_view() of original image but I really wish I could avoid that step. Cheers, Szymon

2 3

Fwd: building cufflinks has compiler error related to boost
by Michael Gooch 15 Jul '11

15 Jul '11

The following error is happening when I try to build cufflinks. I am on Red Hat Enterprise Linux 6.1 and I have installed every boost package available from the RHN repositories. (I would install directly from boost but RHN support is usually anal about using stuff from source when its available from them.) Cufflinks says it uses boost 1.38, and the package version is 1.41, so the version should be adequate. I'm somewhat lost now. This occurred after I noticed some of the pre-bulit binaries had issues with red-hat's version of the z-lib library, so I was trying to see if building the package would interface properly with the included z-lib from redhat, but then I ran into this boost problem. the error: cufflinks.o:(.rodata._ZTIN5boost6detail11thread_dataINS_3_bi6bind_tIvPFvRK16RefSequenceTableP9HitBundleP11BiasLearnereP8_IO_FILESC_SC_ENS2_5list7INS_17reference_wrapperIS5_EENS2_5valueIS8_EENSI_ISA_EENSI_IeEENSI_ISC_EESM_SM_EEEEEE[typeinfo for boost::detail::thread_data<boost::_bi::bind_t<void, void (*)(RefSequenceTable const&, HitBundle*, BiasLearner*, long double, _IO_FILE*, _IO_FILE*, _IO_FILE*), boost::_bi::list7<boost::reference_wrapper<RefSequenceTable const>, boost::_bi::value<HitBundle*>, boost::_bi::value<BiasLearner*>, boost::_bi::value<long double>, boost::_bi::value<_IO_FILE*>, boost::_bi::value<_IO_FILE*>, boost::_bi::value<_IO_FILE*> > > >]+0x10): undefined reference to `typeinfo for boost::detail::thread_data_base' libcufflinks.a(common.o): In function `boost::thread_specific_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >::~thread_specific_ptr()': common.cpp:(.text._ZN5boost19thread_specific_ptrISsED2Ev[_ZN5boost19thread_specific_ptrISsED5Ev]+0x35): undefined reference to `boost::detail::set_tss_data(void const*, boost::shared_ptr<boost::detail::tss_cleanup_function>, void*, bool)' libcufflinks.a(assemble.o): In function `boost::thread_specific_ptr<std::basic_string<char, std::char_traits<char>, std::allocator<char> > >::get() const': /usr/include/boost/thread/tss.hpp:82: undefined reference to `boost::detail::get_tss_data(void const*)' /usr/include/boost/thread/tss.hpp:82: undefined reference to `boost::detail::get_tss_data(void const*)' /usr/include/boost/thread/tss.hpp:82: undefined reference to `boost::detail::get_tss_data(void const*)' /usr/include/boost/thread/tss.hpp:82: undefined reference to `boost::detail::get_tss_data(void const*)' /usr/include/boost/thread/tss.hpp:82: undefined reference to `boost::detail::get_tss_data(void const*)' libcufflinks.a(assemble.o):/usr/include/boost/thread/tss.hpp:82: more undefined references to `boost::detail::get_tss_data(void const*)' follow collect2: ld returned 1 exit status make[2]: *** [cufflinks] Error 1 M.Gooch

2 1

[regex] Segmentation fault on regex_search only on CentOS
by Narinder Claire 15 Jul '11

15 Jul '11

Hi I'll illustrate the problem I have seen in the past with an example. It may or may not be directly or indirectly linked with the seg fault issue you are seeing. Although mine is not a seg fault, it does demonstrate very different behaviour between gcc on Centos (4.1.2) and gcc on Ubuntu (4.5.2) Consider the following 3 source files: main.cpp -> ---------------------------------- #include<iostream> #include"my_exception.h" using namespace std; void foo(); int main() { try { foo(); } catch(const my_exception &err) { cout << err.what(); } //catch(const exception &err) //{ //cout << "OOPs unknown error "; //} cout <<"\n"; } ---------------------------------- dll.cpp -> ---------------------------------- #include"my_exception.h" void __attribute__ ((visibility("default"))) foo() { throw my_exception(); } ---------------------------------- my_exception.h -> ---------------------------------- #include<exception> class my_exception: public std::exception { public: virtual const char* what() const throw() { return "my_exception"; } my_exception()throw(){} virtual ~my_exception()throw(){} }; ---------------------------------- and the following makefile makefile -> ---------------------------------- CXX=g++ all: $(CXX) dll.cpp -fvisibility=hidden -fPIC -shared -o libdll.so $(CXX) main.cpp -fPIC -L./ -ldll -o main clean: rm -fr lib*.so main ---------------------------------- Compiled on Centos 5.6 with gcc with the following specs: Using built-in specs. Target: x86_64-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-libgcj-multifile --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --disable-plugin --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --with-cpu=generic --host=x86_64-redhat-linux Thread model: posix gcc version 4.1.2 20080704 (Red Hat 4.1.2-50) The output is : terminate called after throwing an instance of 'my_exception' what(): my_exception Aborted However compiled with gcc on Ubuntu 11.04 with specs: Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.5.2-8ubuntu4' --with-bugurl=file:///usr/share/doc/gcc-4.5/README.Bugs --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.5 --enable-shared --enable-multiarch --with-multiarch-defaults=x86_64-linux-gnu --enable-linker-build-id --with-system-zlib --libexecdir=/usr/lib/x86_64-linux-gnu --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.5 --libdir=/usr/lib/x86_64-linux-gnu --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-plugin --enable-gold --enable-ld=default --with-plugin-ld=ld.gold --enable-objc-gc --disable-werror --with-arch-32=i686 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4) The output is : my_exception If I execute the Ubuntu compiled binary on Centos I still get the same 'Aborted' output. If I execute the Centos compiled binary on Ubuntu I get the expected output of the string 'my_exception' This suggests that the 'difference' is not coming from the compiler but from the runtime. As stated before this may not be related to your seg fault issue but the authors of regex could most likely tell straight away. Best Wishes N

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boost::mpl and VS 2005
by Narinder Claire 15 Jul '11

15 Jul '11

Hello, Can someone say whether it's likely to be a bug in VS2005 or if it's an oversight in MPL ? I would guess it's a bug in VS2005 and would be interested to know whether there's a workaround in Boost. Best N

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Trying to install 1.47 on Snow Leopard using clang toolset gives error "missing argument parent-requirements"
by doug livesey 14 Jul '11

14 Jul '11

Hi -- I'm trying to install boost 1.47.0 on my Snow Leopard machine, using clang, but I can't seem even to build the b2 tool. The error I get is "missing argument parent-requirements". The full output is here: https://gist.github.com/1081527 If anyone could offer me any advice, I'd be very grateful -- I'm dying to play with Phoenix! :) Cheers, Doug.

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strong_typedef
by Dmitry Vinogradov 14 Jul '11

14 Jul '11

Hi everyone. Is <boost/strong_typedef.hpp> obsolete? Compiling this code: // -- cut --- #include <boost/strong_typedef.hpp> #include <boost/archive/binary_oarchive.hpp> // -- cut --- gives: 1>E:\Libraries\boost\boost/serialization/strong_typedef.hpp(45): warning C4005: 'BOOST_STRONG_TYPEDEF' : macro redefinition 1> E:\Libraries\boost\boost/strong_typedef.hpp(45) : see previous definition of 'BOOST_STRONG_TYPEDEF' Does one need to use <boost/serialization/strong_typedef.hpp> instead?

2 1

Serialization building on VS2010
by Zoltán Lengyel 14 Jul '11

14 Jul '11

Hello, I am having a LINK error when I try to include stuff for serialization: * #include <boost/archive/text_oarchive.hpp> #include <boost/archive/text_iarchive.hpp> 1>LINK : fatal error LNK1104: cannot open file 'libboost_serialization-vc100-mt-gd-1_46_1.lib' *So I am trying to build this, with the libs/serialization/vc7ide/BoostSerializationLibrary.sln using Microsoft Visual Studio 2010 Express on Windows 7 (64 bit). Building the solution finished with: *========== Build: 2 succeeded, 88 failed, 0 up-to-date, 0 skipped ==========* With a lot of: * 90>LINK : fatal error LNK1104: cannot open file 'boost_filesystem-vc100-mt-gd-1_46_1.lib'* So I tried next the libs/filesystem/v3/test/msvc10/filesystem-v3.sln. Building the solution finished with 3 failed, but it was because it didn't find some of the tutorial projects, so leaving those out from the build made: *========== Build: 10 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========* But this doesn't seem to give me *boost_filesystem-vc100-mt-gd-1_46_1.lib *anywhere, so all the problems above remain. What am I doing wrong?

3 2

[random] Cauchy distribution
by Karsten Ahnert 14 Jul '11

14 Jul '11

Hi, I have the following code boost::mt19937 rng; boost::cauchy_distribution< double > cauchy( 0.0 , 0.1 ); for( size_t i=0 ; i<16 ; ++i ) { std::cout << cauchy( rng ) << " "; } which produced this sequence : 76513.4 4.3467e+06 -254805 -1.63299e+06 -6.96405e+06 233243 214884 883827 471904 268253 648798 140314 1.43562e+06 653319 -582905 91567.6 I think these number are much to high. The standard deviation should be 0.1. Does anyone knows what went wrong? Is this my failure? I use boost 1.46 and gcc 4.5.2.

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parsing query
by Sean Farrow 14 Jul '11

14 Jul '11

Hi: I'm working on a project and have a file with lines of the following form: :function AddBrailleColors :Synopsis Provides a method for the user to assign custom colors to be marked in Braille. :Description Brings up a dialog for the user to assign the colors on the screen to Braille marking. :Param String/strForeground Enter the variable containing the RGB string for the foreground color. :Param String/strBackground Enter the RGB string for the background color. :Param String/sApp Enter the value for the app file name to be used. :Category Colors What boost library do people feel is the best one to use to parse this form of input, boost.Regex, boost.proto or boost.spirit? And given the input, what would be the best way of going about doing this? I need the function, Synopsis, Description, and then the parameters ideally placed in separate variables. Any help appreciated. Cheers Sean.

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[1.47.0] Release notice
by Beman Dawes 14 Jul '11

14 Jul '11

Release 1.47.0 of the Boost C++ Libraries is now available. These open-source libraries work well with the C++ Standard Library, and are usable across a broad spectrum of applications. The Boost license encourages both commercial and non-commercial use. This release contains four new libraries (Chrono, Geometry, Phoenix, Ratio) and numerous enhancements and bug fixes for existing libraries. For details, including download links, see http://www.boost.org/users/news/version_1_47_0 The release can also be downloaded directly from SourceForge. See http://sourceforge.net/projects/boost/files/ To install this release on your system, see http://www.boost.org/doc/libs/release/more/getting_started/index.html Thanks, --The Boost release team Beman Dawes Daniel James Eric Niebler Rene Rivera Vladimir Prus

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[serialization] Storing something that could be primitive or non-default constructable.
by Noah Roberts 13 Jul '11

13 Jul '11

template < typename T > struct storing { storing(T const& t) : val(t) {} T val; }; namespace boost { namespace serialization { template < typename Archive, typename T > void save_construct_data(Archive & ar, storing<T> const* ptr, unsigned int const) { // what to put here? } template < typename Archive, typename T > void load_construct_data(Archive & ar, storing<T> * ptr, unsigned int const) { // what here? } }} If I try to store val as a pointer then I can't instantiate with anything serialization considers "primitive". For instance, if I try to serialize a storing<std::string> then I'll get errors about std::string not having a serialization routine even if I include boost/serialization/string.hpp. If I try to load into a temporary variable then I run into the problem of having to construct one, and sometimes I need extra information to do so (I have the serialization routines dealing with this in such cases). Any ideas?

1 0

Re: [Boost-users] [Range] sub_range and list not working together
by Brian Wood 13 Jul '11

13 Jul '11

Neil Groves: > This compiler error is to be expected because your code is calling the > size() member function. The size() member function requires that the > underlying range is a model of the RandomAccessRange Concept. Since you are > using a sub_range of a std::list and the std::list has bidirectional > iterators, the sub_range is a model of the BidirectionalRange Concept. > > This has changed between boost versions. The boost::size(Range&) function > was modified to only work with ranges that model the RandomAccessRange > Concept because the performance complexity was inconsistent with typical > expectations. For example, in your case the sub_range size would have been > O(N) despite the container probably having an O(1) implementation of size(). > The complexity of std::list size() is not mandated by the standard to be > O(1), even though it is recommended. If one wishes to pay the price and > wishes to have a more general 'size' calculation I recommend using > boost::distance(Range&). Thanks. I found this thread which is closely related to what I'm wondering. http://boost.2283326.n4.nabble.com/Distance-size-of-boost-ranges-for-std-se… I haven't checked into this much, but would using boost::distance when the underlying container is a deque or vector, be slower than using the container's size? Regards, Brian Wood Ebenezer Enterprises http://webEbenezer.net

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[io::streams] Using array device and std::output_iterator
by Ovanes Markarian 13 Jul '11

13 Jul '11

Hello *, I tried to use an array-device based stream and wantet to pass the stream to std::output_iterator or std::istream_iterator, but unfortunately, I get a compilation error with gcc 4.3.5. Boost::IOStreams docu states that the io::stream is either derived from std::basic_istream or std::basic_ostream or both dependent on the underlying device category. array has seekable category, so I'd expect io::stream to derive from both and be compatible with ostream_iterator or istream_iterator. Here is the code snippet: typedef unsigned char byte; typedef io::basic_array<byte> array_device; typedef io::stream<array_device> array_stream; array_stream ios_(ptr_to_byte_array); std::istream_iterator<byte> in(ios_); And the last line results in the error stating: src/chunk_reading_iterator_test.cpp: In member function 'void chunk_reading_iterator_suite::ctor::test_method()': src/chunk_reading_iterator_test.cpp:86: error: no matching function for call to 'std::istream_iterator<unsigned char, char, std::char_traits<char>, int>::istream_iterator(chunk_reading_iterator_suite::<unnamed>::array_stream&)' Thanks for any suggestions, Ovanes

1 0

[regex] Segmentation fault on regex_search only on CentOS
by Alessandro Candini 13 Jul '11

13 Jul '11

I have compiled the same C++ source on two machines: 1 - Ubuntu 11.04, 2.6.38-10-generic #46-Ubuntu SMP Tue Jun 28 15:07:17 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux 2 - CentOS release 5.3, 2.6.18-128.1.14.el5 #1 SMP Wed Jun 17 06:40:54 EDT 2009 i686 i686 i386 GNU/Linux On Ubuntu I have g++-4.5.2, on CentOs g++-4.4.4 and on both I have boost-1.42.0. My source compiles perfectly on both machines, but on the CentOS one I get a Segmentetion Fault during the execution. Using some prints, I found out where it happens: ... boost::regex grepGPP("Monthly Ecosystem GPP", boost::regex::egrep); cerr << "DEBUG BEFORE!" << endl; boost::regex_search (currGPP, grepGPP) cerr << "DEBUG AFTER!" << endl; ... The segmentation fault comes during the execution of regex_search, beacause "DEBUG AFTER" is not printed. Any ideas on how to solve this problem? Thanks in advance. -- 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."

3 2

[regex] Is it possible to feed boost regex with NFA/DFA
by Chandan Nilange 13 Jul '11

13 Jul '11

We are developing DFA/NFA based hardware regex engine. I intend to use regex boost as goldenized model. Can we feed the regex boost with NFA/DFA states instead of regular expressions syntax Regards, Chandan Nilange

2 1

Serialization writing an old version of a class
by Don 13 Jul '11

13 Jul '11

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 old versions 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? Thanks, Don.

1 0

Segmentation fault of boost::format with Intel compiler on OS X
by Daniel Langr 13 Jul '11

13 Jul '11

Hi, compiling the following code with Intel's icpc on OS X: int i = 10; std::string s = boost::str(boost::format("%d") % i); we got segmentation fault when running the executable. With g++ everything works fine. Versions: Boost 1.46.1, Intel icpc 11.1/0.67, OS X 10.8.0 Please help, thanks in advance, Daniel

1 0

[Range] sub_range and list not working together
by Brian Wood 13 Jul '11

13 Jul '11

B"H I've been testing my marshalling support for sub_range and have a question. In reviewing some old posts and notes, it looks like the following used to compile: boost::sub_range<std::list<int32_t> > rng; Today though I get the following error message: g++ -Os -s -W -Wall -I. -I ./loki-0.1.7/include/loki/flex -I /home/brian/boost_1_47_0_beta1 -c -o local_messages_d.cg.o local_messages_d.cg.cc In file included from /home/brian/boost_1_47_0_beta1/boost/range/iterator_range.hpp:13:0, from /home/brian/boost_1_47_0_beta1/boost/range/sub_range.hpp:23, from ./local_messages_d.cg.hh:5, from local_messages_d.cg.cc:1: /home/brian/boost_1_47_0_beta1/boost/range/iterator_range_core.hpp: In member function ‘boost::iterator_range<IteratorT>::difference_type boost::iterator_range<IteratorT>::size() const [with IteratorT = std::_List_iterator<int>, boost::iterator_range<IteratorT>::difference_type = int]’: /home/brian/boost_1_47_0_beta1/boost/range/sub_range.hpp:117:58: instantiated from ‘boost::sub_range<ForwardRange>::difference_type boost::sub_range<ForwardRange>::size() const [with ForwardRange = std::list<int>, boost::sub_range<ForwardRange>::difference_type = int]’ local_messages_d.cg.cc:22:33: instantiated from here /home/brian/boost_1_47_0_beta1/boost/range/iterator_range_core.hpp:252:32: error: no match for ‘operator-’ in ‘((const boost::iterator_range<std::_List_iterator<int> >*)this)->boost::iterator_range<std::_List_iterator<int> >::m_End - ((const boost::iterator_range<std::_List_iterator<int> >*)this)->boost::iterator_range<std::_List_iterator<int> >::m_Begin’ /usr/lib/gcc/i686-redhat-linux/4.5.1/../../../../include/c++/4.5.1/bits/stl_bvector.h:179:3: note: candidate is: ptrdiff_t std::operator-(const std::_Bit_iterator_base&, const std::_Bit_iterator_base&) /home/brian/boost_1_47_0_beta1/boost/range/iterator_range_core.hpp:253:13: warning: control reaches end of non-void function Is this to be expected? I don't know if a specialization for std::list in this regard would be useful, but seems possible. If I change the list to a vector, everything compiles fine. boost::sub_range<std::vector<int32_t> > rng; The following sentence from the docs doesn't make sense to me. "counting_range is a function to generator that generates an iterator_rangewrapping a counting_iterator (from Boost.Iterator). " Regards, Brian Wood Ebenezer Enterprises http://webEbenezer.net

2 1

boost regex 64 bit build
by Lloyd 13 Jul '11

13 Jul '11

Hi, I want to build boost regex 64 bit for a program on a Windows 7 64bit machine. I have downloaded boost 1.45 and built "bjam" by running "bootstarp.bat". >From "bjam" I built the regex library using the following command bjam --build-type=minimal --with-regex using=msvc --address-model=64 I am compiling using visual studio 2010. When I try to link my program with boost::regex, i get the error unresoleved external symbol " private: class boost::basic_regex<char, ...... What could be the problem? Thanks a lot, Lloyd

2 3

[iostreams] Issue when compiling with zlib, and suggestion
by Sean Farrow 13 Jul '11

13 Jul '11

Hi all: I'm currently trying to compile boost 1.47. I need to use the zlib features in the ioStreams library hence am using the following command line: bjam toolset=msvc --stagedir=stage/vc/v10/32-bit -sZLIB_SOURCE="c:\progra~1\zlib" -sZLIB_LIBPATH="c:\progra~1\zlib\boost_zlib.lib" -sBZIP2_SOURCE="c:\progra~1\bzip2" --build-type=complete >boostv10.txt this fails telling me it carn't open boost_zlib.lib. it appears from the docs that this command line is correct. I'm compiling on windows xp, vc 2010. Also, whilst I think about it, without modifying the default jam file the boost.iostreams library fails to compile, the file gzio.c is no longer in the zlib distribution as of version 1.2.3.9-could this be rectified for future boost releases? Regards Sean.

2 1

Some quesions about boost::flyweight
by 邹磊 12 Jul '11

12 Jul '11

Hi, all. Does boost::flyweight support serialization ? If it does, could you give me a example ? I cannot find document about serialization for this library. Thanks. Regards. zou

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[1.47] PDF build of documentation available.
by John Maddock 12 Jul '11

12 Jul '11

The PDF builds of the Boost documentation are now available from: https://sourceforge.net/projects/boost/files/boost-docs/1.47.0/ Note that as ever, only the subset of libraries which use quickbook/boostbook/docbook as their documentation format are included in the build. Regards, John.

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boost::mpl and VS 2005
by narinder.claire＠uk.bnpparibas.com 12 Jul '11

12 Jul '11

Hi, The following piece of code compile successfully on VS2008,VS2010 & GCC 4.5.2 but fails to compile on VS2005. Is the likely to be because of a bug in VS2005 ? (boost v 1.46.1) ------------------------------------------------------------ #include<iostream> #include<string> #include<boost/tr1/type_traits.hpp> #include<boost/mpl/empty.hpp> #include<boost/mpl/vector.hpp> #include<boost/mpl/filter_view.hpp> #include<boost/utility.hpp> template<class T> struct is_recognised_type { static const bool value =false; }; typedef boost::mpl::vector<std::string> naked_variant_type_list; struct myclass { myclass(){} template<class T> myclass(const T&t, const typename boost::disable_if_c<is_recognised_type<T>::value,T >::type * ptr =0, const typename boost::disable_if_c< boost::mpl::empty< typename boost::mpl::filter_view< naked_variant_type_list,boost::is_convertible<T,boost::mpl::_> >::type>::value>::type * pt =0, const typename boost::enable_if_c< boost::mpl::empty< typename boost::mpl::filter_view< naked_variant_type_list,std::tr1::is_base_of<boost::mpl::_,T> >::type>::value>::type * pt2 =0) { } }; int main() { myclass m; m = "hello"; } ------------------------------------------------------------ My workaround is to collapse is_convertible and is_base_of into a single type_trait is_convertible_but_not_derived_from. and then it works. The problems seems to be that there are two trait checks, using either one individualy seems to work. Rgds Narinder ___________________________________________________________ This e-mail may contain confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and delete this e-mail. Any unauthorised copying, disclosure or distribution of the material in this e-mail is prohibited. Please refer to http://www.bnpparibas.co.uk/en/information/legal_information.asp?Code=ECAS-… for additional disclosures.

1 0

Lean and mean boost
by Robert Bielik 12 Jul '11

12 Jul '11

Hi all, I'm sitting here developing a build script to automate my build which first of all involves checking out sources, one of which is boost. However, 99.9% of the checkout time is boost tests/documentation/examples and what have you. It would be such a good feature to split out these stuffs so that there is a way to get to the nitty gritty jucy stuff without having to wait half a day... ;) Sorry for kicking in open doors, if that's what I'm doing ? :) Regards /Rob

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Re: [Boost-users] Boost-users Digest, Vol 2775, Issue 2
by Edward Rankin 12 Jul '11

12 Jul '11

On Thu, Jul 7, 2011 at 12:00 AM, <boost-users-request(a)lists.boost.org>wrote: > ---------- Forwarded message ---------- > From: John Maddock <boost.regex(a)virgin.net> > To: <boost-users(a)lists.boost.org> > Date: Wed, 6 Jul 2011 10:39:37 +0100 > Subject: Re: [Boost-users] [chrono] Intel Composer XE 2011 unable to > compilechrono library > >> It will happily compile. It is rather bizarre that this is necessary, >> which >> leads Vicente and I to believe that there is a bug in the Intel Compiler. >> What do you guys think? I have also posted to the Intel forums, the thread >> can be seen here: >> http://software.intel.com/en-**us/forums/showthread.php?t=**84061<http://software.intel.com/en-us/forums/showthread.php?t=84061> >> > > Looks like a bug to me - if you have a reduced test case I file a bug > report with Intel, > > HTH, John. > One of the Intel engineers has asked for more information which I have provided. I do have Premier Support, but as there is no company-specific code involved I have chosen to go for the open forum approach. I don't think I will be able to come up with a reduced test case since I am not proficient with templates and currently do not have any idea why this error is occurring. Regards, Edward

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Re: [Boost-users] [chrono] Intel Composer XE 2011 unable to compile chrono library
by Edward Rankin 12 Jul '11

12 Jul '11

Hi, 2011/7/7 <boost-users-request(a)lists.boost.org> > ---------- Forwarded message ---------- > From: Vicente Botet <vicente.botet(a)wanadoo.fr> > To: boost-users(a)lists.boost.org > Date: Wed, 6 Jul 2011 15:46:31 -0700 (PDT) > Subject: Re: [Boost-users] [chrono] Intel Composer XE 2011 unable to > compile chrono library > > Edward Rankin wrote: > > > > Hi, > > > > The purpose of this email is to get some insight on the problem we faced > > when trying to compile chrono from the 1.47 Beta 1 package. I have tried > > both the latest released compiler (2011 Update 4) and the current SP1 > > beta. > > There is no issue with VS 2010 SP1's compiler. > > > > It was first surfaced here: > > http://comments.gmane.org/gmane.comp.lib.boost.user/68421. The error > > received can be seen below: > > < snip > > > chrono.cpp > > .\boost/chrono/duration.hpp(94): error: expected an expression > > && (boost::is_convertible<Rep2, > > ^ > > > > .\boost/chrono/duration.hpp(124): error: expected an expression > > && (boost::is_convertible<Rep, > > ^ > > < snip > > > > > After some discussion with Vicente and some testing by me, it turns out > > that > > Intel was not happy with the first operand of the && operator in the > > following snippet of code: > > > > template <class Duration, class Rep2, > > bool = ( > > (boost::is_convertible<typename Duration::rep, > > typename common_type<typename Duration::rep, > > Rep2>::type>::value) > > && (boost::is_convertible<Rep2, > > typename common_type<typename Duration::rep, > > Rep2>::type>::value) > > ) > > > > > struct duration_divide_imp > > { > > }; > > > > If we place an additional parenthesis around that first operand like > this: > > > > template <class Duration, class Rep2, > > bool = ( > > ( (boost::is_convertible<typename Duration::rep, > > typename common_type<typename Duration::rep, > > Rep2>::type>::value) ) > > && (boost::is_convertible<Rep2, > > typename common_type<typename Duration::rep, > > Rep2>::type>::value) > > ) > > > > > struct duration_divide_imp > > { > > }; > > > > It will happily compile. It is rather bizarre that this is necessary, > > which > > leads Vicente and I to believe that there is a bug in the Intel Compiler. > > What do you guys think? I have also posted to the Intel forums, the > thread > > can be seen here: > > http://software.intel.com/en-us/forums/showthread.php?t=84061 > > > > Regards, > > > > Edward > > > > > > Hi Edward, > > I committed the change on the trunk. Please, let me know if there is some > issue as the I'm not able to check with Intel compilers, and the regression > test don't have a win Intel compiler. > > Thanks, > Vicente > > I have checked the release candidate and it compiles okay. Thanks. Edward

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More Boostcon videos available
by Marshall Clow 12 Jul '11

12 Jul '11

Steven's talk on Boost.Units: http://blip.tv/boostcon/boost-units-5364809 Chris' talk: Are You Ready for IPv6? http://blip.tv/boostcon/are-you-ready-for-ipv6-5364812 Matias's talk: Generic Conversion and Segmentation for Ranges: a Solution for Unicode http://blip.tv/boostcon/generic-conversion-and-segmentation-for-ranges-a-so… Boris's talk: Creating Boost.Asio extensions http://blip.tv/boostcon/creating-boost-asio-extensions-5364822 (The Other) Boris talks about: Object-relational mapping with ODB and Boost http://blip.tv/boostcon/object-relational-mapping-with-odb-and-boost-5364825 The rest later this week. -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki

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serialization: binary archives from 1.44 to 1.46.1...
by Filip Peters 11 Jul '11

11 Jul '11

just ran into this, it seems binary archives made with 1.44 do not read in the latest(1.46.1) version. Since I read about fix_six.cpp, I thought let's try modifying the lib version, maybe that helps. (maybe somebody put fixes in that break other things?) If I change the lib version from 7 to 8, it reads in correctly..... if(boost::archive::library_version_type(7) == lvt){ lvt = boost::archive::library_version_type(8); fb.pubseekpos(26, std::ios_base::out); fb.sputn(reinterpret_cast<const char *>(& lvt), sizeof(lvt)); } (without it, the int at offset 0x26 is already reading wrong in the latest version....) Files from my program created with 1.44 and 1.46.1, with only one object in them, first element an int, only differed in the version byte. I'm just wondering if placing this fix in my reader code is going to work always, without delving too much in the serialization library changes. Best regards, Filip Peters

1 1

Help is required to get the file names in a directory...........
by Amanullah Yasin 11 Jul '11

11 Jul '11

Hello, Before, with boost 1.38 and visual studio 2005, i was using following funtion to retrieve the file names in a folder. Now i switched to boot 1.46.1 and visual studio 2010, but the following method is not working. Please guide me. void Compilation::getFileNames(vector<string>& listOfFiles) { boost::filesystem::directory_iterator iterator(string(".")); for(; iterator != boost::filesystem::directory_iterator(); ++iterator) { cout << (iterator->path().filename())<< endl; listOfFiles.push_back(iterator->path().filename() ); } error: error C2440: 'initializing' : cannot convert from 'boost::filesystem3::path' to 'std::basic_string<_Elem,_Traits,_Ax>' Thanks in advance. aman *Always have your stuff when you need it with @Dropbox. 2GB account is free! http://db.tt/xOEJ2Ag*

2 3

Compilation issue
by Alessandro Candini 11 Jul '11

11 Jul '11

I'm trying to compile an executable with the following command: g++ -Wall -pedantic -g -O3 -DDEBUG -march=native -std=c++0x -lboost_regex -o wrapCMCC wrapCMCC.cpp On an Ubuntu machine with GCC 4.5.2 and BOOST-1.42.0 I can compile without problems. But on a CentOS Linux using GCC 4.4.4 and BOOST-1.46.1 I obtain this error: In file included from /usr/include/boost/mpl/bind.hpp:27, from /usr/include/boost/mpl/lambda.hpp:18, from /usr/include/boost/mpl/iter_fold.hpp:20, from /usr/include/boost/variant/detail/initializer.hpp:27, from /usr/include/boost/variant/variant.hpp:28, from /usr/include/boost/variant.hpp:17, from cmdLine.cpp:31, from wrapCMCC.cpp:1: /usr/include/boost/mpl/apply_wrap.hpp:81:31: error: missing binary operator before token "(" /usr/include/boost/mpl/apply_wrap.hpp:173:31: error: missing binary operator before token "(" ... What does this message means? Thanks in advance... -- 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."

3 4

Ranges and primitive arrays and argument forwarding
by John M. Dlugosz 11 Jul '11

11 Jul '11

In a nutshell, I want to use ranges to unify several different ways of representing "strings" in the program. This includes subranges of an existing sequence, so for consistancy a "fixed" sized container does not need a nul termination but can fill the container completely. The point here is that I want to treat arrays differently from pointers, which is unlike boost::as_literal. The idea is that I can apply a pre-conditioning function to any supported type, and get a iterator_range back out. Here is an example of a trivial function to test it out, that just returns the length: namespace internal { template <typename RangeT> size_t Strlen (RangeT s) { return boost::size(s); } } template <typename T> size_t Strlen (T s) { return internal::Strlen (internal::as_literal(s)); } For a more complex function, every argument that is meant to be a generalized "string" will be so-wrapped, and pass on to the underlying internal form which expects that they are all Ranges. The conditioning needed is almost the same as boost::as_literal, so I copied and modified that: template <typename CharT> inline boost::iterator_range<CharT> measure_fixed (CharT* p, std::size_t capacity) { // The deduced CharT will include the const if called on a const array. Char* found= std::find (p, p+capacity, CharT(0)); // the find algorithm naturally does what I want, returning the same 'end' if not found. return boost::iterator_range<CharT> (p, found); } // Copied directly from Boost: pointers and containers template< class Range > inline boost::iterator_range<typename boost::range_iterator<Range>::type> as_literal( Range& r ) { return boost::range_detail::make_range( r, boost::range_detail::is_char_ptr(r) ); } // Ditto, with const. Duplication needed because && not available on VS8 template< class Range > inline boost::iterator_range<typename boost::range_iterator<const Range>::type> as_literal( const Range& r ) { return boost::range_detail::make_range( r, boost::range_detail::is_char_ptr(r) ); } // Actual arrays: I want to treat differently from pointers. template <typename Char, std::size_t sz > inline boost::iterator_range<Char*> as_literal( Char (&arr)[sz] ) { return measure_fixed (arr, sz); } // Duplicate needed for const form. template< typename Char, std::size_t sz > inline boost::iterator_range<const Char*> as_literal( const Char (&arr)[sz] ) { return measure_fixed (arr, sz); } However, I find that it is NOT distinguishing arrays: char cA[4]= { 'a', 'b', 'c', 'd' }; // fixed size array, no termination size_t result= Strlen (cA); This is calling the regular form, not the arragy form. The top-level function's call to internal::as_literal is going to the first form, not the third. The parameter, r, is of type char*& from what the debugger tells me, so the template argument Range must be deduced as char*. The original Strlen see s as a char*, so it's already lost it at this point. If I have to write every top-level function to take separate array and non-array template forms, besides being less elegant it will be a combinitational explosion on functions that take multiple arguments. Is there a way around this that work in Visual Studio 2005 (a.k.a. VS8)? When the project finally moves to a newer compiler, does rvalue references ("perfect forwarding") fix this issue, or is it still losing the arrayness by design? Thanks, —John

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Re: [Boost-users] [PropertyTree] wasRE: [Program_options] sections in config files
by Sean Farrow 11 Jul '11

11 Jul '11

Hi: Ok, I've just takan a look at property tree and it seems to do what I want, however if I use xml, and for example have an element such as: <Person id=121> <Name="bla"/> <age=33/> </Person> How will propertytree handle the attribute on person, i.e the id member? Secondly, How do I go about having a number of person entries-i.e persons. I was thinking of using a vector of propertyTrees, will this work? Any help appreciated! Cheers Sean. > From: boost-users-bounces(a)lists.boost.org [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Sebastian Redl Sent: 11 July 2011 13:43 To: boost-users(a)lists.boost.org Subject: Re: [Boost-users] [Program_options] sections in config files On 11.07.2011 14:34, Sean Farrow wrote: Hi: I'm new to using the program_options library. I have a requirement to use an ini file style configuration file. I have a file of the form: [Section 1] Key 1 =value1 Key2=value2 [section2] Key1=value1 Key2=value2 What I'd like to be able to do is: Firstly enumerate the sections assuming the form above. Then secondly enumerate the keys and values in any section of my coosing. Will program_options allow me to do this? No, but PropertyTree will. Sebastian

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Sleeping a Boost.thread for some Boost.date_time nanoseconds
by Emer Rodriguez Formisano 11 Jul '11

11 Jul '11

Good morning, I want a boost thread to sleep for some nanoseconds. The following code is a sample that compiles without errors. However, it does not work as expected and I cannot figure out why. It seems that the application get stacked when executes the instruction: sleep(time1) and it does not execute any thing else. #include <iostream> #include <boost/thread.hpp> #include <boost/date_time/posix_time/posix_time.hpp> #include <boost/date_time.hpp> //Building options: //-DBOOST_DATE_TIME_POSIX_TIME_STD_CONFIG -lboost_date_time-mt -lboost_thread-mt void replay() { boost::posix_time::time_duration time1, time2; time1=boost::posix_time::seconds(3); std::cout << boost::posix_time::to_simple_string(time1) << std::endl; boost::this_thread::sleep(time1); time2=boost::posix_time::nanoseconds(987654321); std::cout << boost::posix_time::to_simple_string(time2) << std::endl; boost::this_thread::sleep(time2); } int main(int argc, char* argv[]) { boost::thread replaythread(replay); replaythread.join(); return 0; } The BOOST_DATE_TIME_POSIX_TIME_STD_CONFIG is a preprocessor definition required in order to work with nanoseconds (http://www.boost.org/doc/libs/1_44_0/doc/html/date_time/details.html#date_t…) The thread sleeps perfectly for 3 seconds if you remove the mentioned definition from the building options and if you also comment out the code related to nanoseconds (lines 15-17). Thank you very much for your time This question was also posted to stackoverflow (http://stackoverflow.com/questions/6636731/) -- Emer Rodríguez Formisano

2 2

[Program_options] sections in config files
by Sean Farrow 11 Jul '11

11 Jul '11

Hi: I'm new to using the program_options library. I have a requirement to use an ini file style configuration file. I have a file of the form: [Section 1] Key 1 =value1 Key2=value2 [section2] Key1=value1 Key2=value2 What I'd like to be able to do is: Firstly enumerate the sections assuming the form above. Then secondly enumerate the keys and values in any section of my coosing. Will program_options allow me to do this? Cheers Sean.

2 1

[Interprocess] : problem with large vector of maps in memory mapped file
by Steven Maenhout 11 Jul '11

11 Jul '11

Dear all, I'm using Boost 1.47 on Linux x86_64 in combination with gcc version 4.5.1. I'm trying to implement a large vector of maps in a memory mapped file. My code works fine on small example cases but crashes randomly when trying to store larger datasets. The application generally runs fine for a few days before a segementation fault occurs which makes debugging very time consuming. A trimmed down version of the code looks like this: typedef boost::interprocess::managed_mapped_file::segment_manager SegmentManager_t; typedef boost::interprocess::allocator<void, SegmentManager_t> VoidAllocator_t; typedef std::pair<const uint,double> MapValue_t; typedef boost::interprocess::allocator<MapValue_t , SegmentManager_t> MapValueAllocator_t; typedef boost::interprocess::map<uint,double,std::less<uint>,MapValueAllocator_t> Map_t; typedef boost::interprocess::allocator<Map_t,SegmentManager_t> MapAllocator_t; typedef boost::interprocess::vector<Map_t,MapAllocator_t> VectorofMaps_t; boost::interprocess::managed_mapped_file m_mfile=managed_mapped_file(open_or_create, TEMPFILEPATH, TEMPFILEPATHSIZE); VoidAllocator_t alloc_inst (m_mfile.get_segment_manager()); VectorofMaps_t* m_pS=m_mfile.construct<VectorofMaps_t>(anonymous_instance)(numsparserows,Map_t(std::less<uint>(),alloc_inst),alloc_inst); I've managed to obtain a stack trace which pinpoints the problem at the use of the function lower_bound: Map_t::iterator mapiter=(*m_pS)[row].lower_bound(col); I realize that such random segfaults could be the result of a hardware problem (memory corruption, cpu overheating, hard drive storing the memory mapped file (ssd)) but stress testing these components has not revealed any problems. I am therefore hoping that somebody would be able to get some more information from the stack trace provided below. Any help or advice on how to identify the problem would be greatly appreciated. Steven #0 0x0000000000720244 in std::less<unsigned int>::operator() (this=0x7fffffffc390, __x=@0x3ff07fcf9f552438, __y=@0x7fffffffc5c0) at /usr/lib/gcc/x86_64-redhat-linux/4.5.1/../../../../include/c++/4.5.1/bits/stl_function.h:230 #1 0x0000000000721fc7 in boost::container::containers_detail::value_compare_impl<unsigned int, std::pair<unsigned int const, double>, std::less<unsigned int>, boost::container::containers_detail::select1st<std::pair<unsigned int const, double> > >::operator()<std::pair<unsigned int const, double>, unsigned int> (this=0x7fffffffc390, key1=..., key2=@0x7fffffffc5c0) at /home/smaenhout/c++/boost/include/boost/interprocess/containers/container/detail/tree.hpp:78 #2 0x0000000000721b4f in boost::container::containers_detail::rbtree<unsigned int, std::pair<unsigned int const, double>, boost::container::containers_detail::select1st<std::pair<unsigned int const, double> >, std::less<unsigned int>, boost::interprocess::allocator<std::pair<unsigned int const, double>, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void, long, unsigned long, 0u>, 0ul>, boost::interprocess::iset_index> > >::key_node_compare<boost::container::containers_detail::value_compare_impl<unsigned int, std::pair<unsigned int const, double>, std::less<unsigned int>, boost::container::containers_detail::select1st<std::pair<unsigned int const, double> > > >::operator()<boost::container::containers_detail::rbtree_node<std::pair<unsigned int const, double>, boost::interprocess::offset_ptr<void> >, unsigned int> (this=0x7fffffffc390, key1=..., key2=@0x7fffffffc5c0) at /home/smaenhout/c++/boost/include/boost/interprocess/containers/container/detail/tree.hpp:337 #3 0x0000000000721747 in boost::intrusive::detail::key_nodeptr_comp<boost::container::containers_detail::rbtree<unsigned int, std::pair<unsigned int const, double>, boost::container::containers_detail::select1st<std::pair<unsigned int const, double> >, std::less<unsigned int>, boost::interprocess::allocator<std::pair<unsigned int const, double>, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>, boost::interprocess::iset_index> > >::key_node_compare<boost::container::containers_detail::value_compare_impl<unsigned int, std::pair<unsigned int const, double>, std::less<unsigned int>, boost::container::containers_detail::select1st<std::pair<unsigned int const, double> > > >, boost::intrusive::rbtree_impl<boost::intrusive::setopt<boost::intrusive::detail::base_hook_traits<boost::container::containers_detail::rbtree_node<std::pair<unsigned int const, double>, boost::interprocess::offset_ptr<void, long, unsigned long, 0u> >, boost::intrusive::rbtree_node_traits<boost::interprocess::offset_ptr<void, long, unsigned long, 0u>, true>, (boost::intrusive::link_mode_type)0, boost::intrusive::default_tag, 3>, boost::container::containers_detail::node_compare<boost::container::containers_detail::value_compare_impl<unsigned int, std::pair<unsigned int const, double>, std::less<unsigned int>, boost::container::containers_detail::select1st<std::pair<unsigned int const, double> > >, boost::container::containers_detail:: rbtree_node<std::pair<unsigned int const, double>, boost::interprocess::offset_ptr<void, long, unsigned long, 0u> > >, unsigned long, true> > >::operator()<boost::interprocess::offset_ptr<boost::intrusive::compact_rbtree_node<boost::interprocess::offset_ptr<void> >, long, unsigned long, 0u>, unsigned int> (this=0x7fffffffc390, key1=..., key2=@0x7fffffffc5c0) at /home/smaenhout/c++/boost/include/boost/intrusive/detail/utilities.hpp:236 #4 0x00000000007213cc in boost::intrusive::detail::tree_algorithms<boost::intrusive::rbtree_node_traits<boost::interprocess::offset_ptr<void, long, unsigned long, 0u>, true> >::lower_bound<unsigned int, boost::intrusive::detail::key_nodeptr_comp<boost::container::containers_detail::rbtree<unsigned int, std::pair<unsigned int const, double>, boost::container::containers_detail::select1st<std::pair<unsigned int const, double> >, std::less<unsigned int>, boost::interprocess::allocator<std::pair<unsigned int const, double>, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>, boost::interprocess::iset_index> > >::key_node_compare<boost::container::containers_detail::value_compare_impl<unsigned int, std::pair<unsigned int const, double>, std::less<unsigned int>, boost::container::containers_detail::select1st<std::pair<unsigned int const, double> > > >, boost::intrusive::rbtree_impl<boost::intrusive::setopt<boost::intrusive::detail::base_hook_traits<boost::container::containers_detail::rbtree_node<std::pair<unsigned int const, double>, boost::interprocess::offset_ptr<void> >, boost::intrusive::rbtree_node_traits<boost::interprocess::offset_ptr<void>, true>, (boost::intrusive::link_mode_type)0, boost::intrusive::default_tag, 3>, boost::container::containers_detail::node_compare<boost::container::containers_detail::value_compare_impl<unsigned int, std::pair<unsigned int const, double>, std::less<unsigned int>, boost::container::containers_detail::select1st<std::pair<unsigned int const, double> > >, boost::container::containers_detail::rbtree_node<std::pair<unsigned int const, double>, boost::interprocess::offset_ptr<void> > >, unsigned long, true> > > > (header=..., key=@0x7fffffffc5c0, comp=...) at /home/smaenhout/c++/boost/include/boost/intrusive/detail/tree_algorithms.hpp:839 #5 0x0000000000720e32 in boost::intrusive::rbtree_algorithms<boost::intrusive::rbtree_node_traits<boost::interprocess::offset_ptr<void, long, unsigned long, 0u>, true> >::lower_bound<unsigned int, boost::intrusive::detail::key_nodeptr_comp<boost::container::containers_detail::rbtree<unsigned int, std::pair<unsigned int const, double>, boost::container::containers_detail::select1st<std::pair<unsigned int const, double> >, std::less<unsigned int>, boost::interprocess::allocator<std::pair<unsigned int const, double>, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>, boost::interprocess::iset_index> > >::key_node_compare<boost::container::containers_detail::value_compare_impl<unsigned int, std::pair<unsigned int const, double>, std::less<unsigned int>, boost::container::containers_detail::select1st<std::pair<unsigned int const, double> > > >, boost::intrusive::rbtree_impl<boost::intrusive::setopt<boost::intrusive::detail::base_hook_traits<boost::container::containers_detail::rbtree_node<std::pair<unsigned int const, double>, boost::interprocess::offset_ptr<void> >, boost::intrusive::rbtree_node_traits<boost::interprocess::offset_ptr<void>, true>, (boost::intrusive::link_mode_type)0, boost::intrusive::default_tag, 3>, boost::container::containers_detail::node_compare<boost::container::containers_detail::value_compare_impl<unsigned int, std::pair<unsigned int const, double>, std::less<unsigned int>, boost::container::containers_detail::select1st<std::pair<unsigned int const, double> > >, boost::container::containers_detail::rbtree_node<std::pair<unsigned int const, double>, boost::interprocess::offset_ptr<void> > >, unsigned long, true> > > > (header=..., key=@0x7fffffffc5c0, comp=...) at /home/smaenhout/c++/boost/include/boost/intrusive/rbtree_algorithms.hpp:470 #6 0x00000000007207f1 in boost::intrusive::rbtree_impl<boost::intrusive::setopt<boost::intrusive::detail::base_hook_traits<boost::container::containers_detail::rbtree_node<std::pair<unsigned int const, double>, boost::interprocess::offset_ptr<void, long, unsigned long, 0u> >, boost::intrusive::rbtree_node_traits<boost::interprocess::offset_ptr<void, long, unsigned long, 0u>, true>, (boost::intrusive::link_mode_type)0, boost::intrusive::default_tag, 3>, boost::container::containers_detail::node_compare<boost::container::containers_detail::value_compare_impl<unsigned int, std::pair<unsigned int const, double>, std::less<unsigned int>, boost::container::containers_detail::select1st<std::pair<unsigned int const, double> > >, boost::container::containers_detail::rbtree_node<std::pair<unsigned int const, double>, boost::interprocess::offset_ptr<void, long, unsigned long, 0u> > >, unsigned long, true> >::lower_bound<unsigned int, boost::container::containers_detail::rbtree<unsigned int, std::pair<unsigned int const, double>, boost::container::containers_detail::select1st<std::pair<unsigned int const, double> >, std::less<unsigned int>, boost::interprocess::allocator<std::pair<unsigned int const, double>, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family>, boost::interprocess::iset_index> > >::key_node_compare<boost::container::containers_detail::value_compare_impl<unsigned int, std::pair<unsigned int const, double>, std::less<unsigned int>, boost::container::containers_detail::select1st<std::pair<unsigned int const, double> > > > > (this=0x7fc8f21bef08, key=@0x7fffffffc5c0, comp=...) at /home/smaenhout/c++/boost/include/boost/intrusive/rbtree.hpp:1064 #7 0x00000000007202ec in boost::container::containers_detail::rbtree<unsigned int, std::pair<unsigned int const, double>, boost::container::containers_detail::select1st<std::pair<unsigned int const, double> >, std::less<unsigned int>, boost::interprocess::allocator<std::pair<unsigned int const, double>, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void, long, unsigned long, 0u>, 0ul>, boost::interprocess::iset_index> > >::lower_bound (this=0x7fc8f21bef00, k=@0x7fffffffc5c0) at /home/smaenhout/c++/boost/include/boost/interprocess/containers/container/detail/tree.hpp:853 #8 0x000000000071fea8 in boost::container::map<unsigned int, double, std::less<unsigned int>, boost::interprocess::allocator<std::pair<unsigned int const, double>, boost::interprocess::segment_manager<char, boost::interprocess::rbtree_best_fit<boost::interprocess::mutex_family, boost::interprocess::offset_ptr<void, long, unsigned long, 0u>, 0ul>, boost::interprocess::iset_index> > >::lower_bound ( this=0x7fc8f21bef00, x=@0x7fffffffc5c0) at /home/smaenhout/c++/boost/include/boost/interprocess/containers/container/map.hpp:638

1 0

cann't compile Regular Expressions to Split a String code
by Eric Lin 11 Jul '11

11 Jul '11

Dear Boost programers: I copied a piece simple Using Regular Expressions to Split a String code from book(c++ cookbook) chapter 4 section 24, page 196-197, Example code 4.33 --------------------------------------------------------------------- // Example 4-33. Using Boost's regular expressions #include <iostream> #include <string> #include <boost/regex.hpp> int main() { std::string s= "who,lives:in-a,pineapple under the sea?"; boost::regex re(",|:|-|\\s+"); // Create the reg exp boost::sregex_token_iterator // Create an iterator using a p(s.begin(), s.end(), re, -1); // sequence and that reg exp boost::sregex_token_iterator end; // Crate an end_of_reg_exp // marker while (p != end) std::cout << *p++ << '\n'; } ------------------------ source code http://examples.oreilly.com/9780596007614/ > --------------------------------------------- > g++ 4-33.cpp > /tmp/ccx4JXEA.o: In function `boost::basic_regex<char, > boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign(char > const*, char const*, unsigned int)': > 4-33.cpp:(.text._ZN5boost11basic_regexIcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEE6assignEPKcS7_j[boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::assign(char const*, char const*, unsigned int)]+0x22): undefined reference to `boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::do_assign(char const*, char const*, unsigned int)' > /tmp/ccx4JXEA.o: In function `bool > boost::regex_search<__gnu_cxx::__normal_iterator<char const*, > std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char > const*, std::basic_string<char, std::char_traits<char>, > std::allocator<char> > > > >, char, boost::regex_traits<char, > boost::cpp_regex_traits<char> > >(__gnu_cxx::__normal_iterator<char > const*, std::basic_string<char, std::char_traits<char>, > std::allocator<char> > >, __gnu_cxx::__normal_iterator<char const*, > std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, boost::match_results<__gnu_cxx::__normal_iterator<char const*, > std::basic_string<char, std::char_traits<char>, std::allocator<char> > > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char > const*, std::basic_string<char, std::char_traits<char>, > std::allocator<char> > > > > >&, boost::basic_regex<char, > boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, > boost::regex_constants::_match_flags, __gnu_cxx::__normal_iterator<char > const*, std::basic_string<char, std::char_traits<char>, > std::allocator<char> > >)': > 4-33.cpp:(.text._ZN5boost12regex_searchIN9__gnu_cxx17__normal_iteratorIPKcSsEESaINS_9sub_matchIS5_EEEcNS_12regex_traitsIcNS_16cpp_regex_traitsIcEEEEEEbT_SD_RNS_13match_resultsISD_T0_EERKNS_11basic_regexIT1_T2_EENS_15regex_constants12_match_flagsESD_[bool boost::regex_search<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, char, boost::regex_traits<char, boost::cpp_regex_traits<char> > >(__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, __gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, boost::match_results<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > > >&, boost::basic_regex<char, boost::regex_traits<char, boost::cpp_regex_traits<char> > > const&, boost::regex_constants::_match_flags, __gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >)]+0x6c): undefined reference to `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >, boost::regex_traits<char, boost::cpp_regex_traits<char> > >::find()' > /tmp/ccx4JXEA.o: In function > `boost::re_detail::perl_matcher<__gnu_cxx::__normal_iterator<char > const*, std::basic_string<char, std::char_traits<char>, > std::allocator<char> > >, > std::allocator<boost::sub_match<__gnu_cxx::__normal_iterator<char > const*, std::basic_string<char, std::char_traits<char>, > std::allocator<char> > > > >, boost::regex_traits<char, > boost::cpp_regex_traits<char> > > >::perl_matcher(__gnu_cxx::__normal_iterator<char const*, > std::basic_string<char, std::char_t > ------------------------------------------ Thanks your help a lot in advance, Eric

3 2

Time classes and zoneinfo (tz/Olsen) database
by Dom Driver 10 Jul '11

10 Jul '11

Hi List, I'm currently working on a project with a requirement for up-to-date worldwide timezone information, including accurate daylight saving information. How well do the boost time classes handle the tz database? Can I populate the boost classes with up-to-date info easily? Has anyone done this? Ta! D

1 0

[asio] sending and receiving binary
by Wilde, Donald S 10 Jul '11

10 Jul '11

Hello, all - After starting from scratch again, I've been able to climb into boost::asio and am beginning to get it to work. Please bear with me; I'm still a noob when it comes to reading C++ templates. I started by building the little asynchronous daytime server into my primary application, and used the asynch client to successfully talk to it. All well and good. Now, I've built my real message, which is mixed 7-bit ASCII and binary data (counts, checksums, etc.). In experimenting to make it work, I've started changing my code in the server and client to be more like the echo server. It appears to be accepting the message, but when it tries to respond the async_write() function throws an error: ERROR: 'system:0' has occurred. ... and I see 'connection reset by peer' on the client side. I don't THINK it's because I'm sending binary; this is more likely a glitch in my understanding of boost::asio. I'll back up and look at the daytime and echo examples again and try to see what I've messed up, but I thought I'd put this out there as I've been slogging in mud for a few hours now. :) // ---- server code ---- // server using boost::asio::ip::tcp; TCPConnection::TCPConnection(boost::asio::io_service& aIOService) : _socket(aIOService) { } boost::shared_ptr<TCPConnection> TCPConnection::Create(boost::asio::io_service& aIOService) { return boost::shared_ptr<TCPConnection>(new TCPConnection(aIOService)); } tcp::socket& TCPConnection::Socket() { return _socket; } void TCPConnection::CheckMessageAndRespond() { _message = make_my_daytime_string(); boost::asio::async_write( _socket, boost::asio::buffer(_message), boost::bind(&TCPConnection::HandleWrite, shared_from_this(), boost::asio::placeholders::error, boost::asio::placeholders::bytes_transferred)); } void TCPConnection::HandleWrite( const boost::system::error_code& aError, std::size_t aNumBytes) { std::cerr << "ERROR: '" << aError << "' has occurred." << std::endl; } std::string TCPConnection::make_my_daytime_string() { std::time_t now = std::time(0); return std::ctime(&now); } static const int QUERYIPADDR = 2000; TCPServer::TCPServer(boost::asio::io_service& aIOService) : _acceptor(aIOService, tcp::endpoint(tcp::v4(), QUERYIPADDR)) { StartAccept(); } void TCPServer::StartAccept() { boost::shared_ptr<TCPConnection> newconnection = TCPConnection::Create(_acceptor.io_service()); _acceptor.async_accept( newconnection->Socket(), boost::bind(&TCPServer::HandleAccept, this, newconnection, boost::asio::placeholders::error)); std::cout << "Extender inquiry server ready for business!" << std::endl; } void TCPServer::HandleAccept( boost::shared_ptr<TCPConnection> aNewConnection, const boost::system::error_code& aError) { if (!aError) { aNewConnection->CheckMessageAndRespond(); StartAccept(); } } //---- main equiv (within another class) ---------------------- ExtenderServer::ExtenderServer(TVED::ITVExtenderDeviceHandler* aEDHandler) { try { boost::asio::io_service ioservice; TCPServer Server(ioservice); ioservice.run(); } catch (std::exception& e) { std::cerr << e.what() << std::endl; } } //-------- client (extracted code) ------------------------- string message; message.reserve(1024); ... size_t mlen = message.length(); const char* mptr = 0; mptr = message.data(); // Create new IO network client service boost::asio::io_service io_service; // Attach a Query Resolver to it tcp::resolver resolver(io_service); // We will talk to a Well Known Port (currently 2000) tcp::resolver::query query(tcp::v4(), argv[3], "2000"); tcp::resolver::iterator iterator = resolver.resolve(query); tcp::socket socket(io_service); socket.connect(*iterator); boost::system::error_code error; size_t lwrite = boost::asio::write(socket, boost::asio::buffer(mptr, mlen)); if (error) { throw boost::system::system_error(error); // Some error occurred. } cout << "Wrote " << lwrite << " bytes" << endl; char buf[1024]; size_t len; while (1) { char buf[1024]; len = socket.read_some(boost::asio::buffer(buf), error); if (error == boost::asio::error::eof) { cout << "eof" << endl; break; } else if (error) { throw boost::system::system_error(error); // Some other error. } } string response; stringstream sbuf (response, stringstream::in | stringstream::out | stringstream::binary); sbuf.write(buf, len); cout << endl << "Message string server returns: " << endl; print_message(&response); } catch (std::exception& e) { std::cerr << "ERR from faker: " << e.what() << std::endl; } // ---------------------------------run data ----------------------- // example data // as sent by client "faker" program Message string client sends: ASCII: I N T C :: :: :: / :: :: :: :: :: :: :: :: 0 0 : 1 3 : 2 0 : f 9 : 2 a : 8 9 | 1 9 2 . 1 6 8 . 0 . 1 0 | 3 0 0 0 F N :: H Binary: 49 4E 54 43 00 00 00 2F 00 00 00 00 00 00 00 00 30 30 3A 31 33 3A 32 30 3A 66 39 3A 32 61 3A 38 39 7C 31 39 32 2E 31 36 38 2E 30 2E 31 30 7C 33 30 30 30 46 4E 8D 48 Wrote 55 bytes ERR from faker: Connection reset by peer TIA for suggestions! :D -- Don Wilde

2 4

[datetime] convert a int32_t to a time
by Sean Farrow 10 Jul '11

10 Jul '11

Hi: I'm working with a piece of code that gives me time as an int32_t I'd like to convert this in to a more intelligible form to store along with the current date. Does boost.datetime allow me to do this? Any help appreciated. Cheers Sean.

2 1

[thread] terminating a thread when a program exits
by Sean Farrow 10 Jul '11

10 Jul '11

Hi: I've got a situation whereby, I've got a number of boost::thread objects being created by classes in my program and run for the duration of the program. What I need to do is when the exit menu item is activated, close down all threads. I was going to use a condition, and have the threads continue until the condition is signalled, and then use notify_all when the exit menu item is activated. Given that I want this condition to be multi-read/exclusive write, what mutex is the best option? Also will I need to use a mutex in the threads I need to terminate. I see the code of the threads being something like: While (Terminate !=false) { //perform actions. }; Normally in this situation I'd use a windows event and the WaitForSingle/multipleObject functions, but as this has to be cross platform I carn't do this. Any help with this appreciated. Cheers Sean.

1 0

connection timeout
by Gianni Ambrosio 09 Jul '11

09 Jul '11

Hi All, I use an async_connect() call in my tcp socket client implementation. It seems there is a timeout of about 15 seconds (in my case) so that after that time connect callback is executed passing an error. Is there a way to get or set that connection timeout? Regards Gianni

2 1

Re: [Boost-users] [Asio] Crash on service delete
by Marat Abrarov 09 Jul '11

09 Jul '11

Hi, Indrek. > // m_socket was associated with m_service > m_socket->cancel(); > m_socket->shutdown( boost::asio::ip::tcp::socket::shutdown_both, ec ); > m_socket->close( ec ); > delete m_socket; > m_socket = NULL; > > // Delete work on the service > delete m_work; > m_work = NULL; > > // Stop the service > m_service->stop(); > > // Join the thread this service was running on > m_thread->interrupt(); > m_thread->join(); > delete m_thread; > m_thread = NULL; > > // Crashes here > delete m_service; > m_service = NULL; > > Here's what VC10 reported: > Access violation > camc.exe!boost::asio::detail::socket_ops::send(unsigned int s, const _WSABUF > * bufs, unsigned int count, int flags, boost::system::error_code & ec) Line > 876 + 0x24 bytes C++ > camc.exe!boost::asio::detail::socket_select_interrupter::interrupt() Line > 127 + 0x18 bytes C++ > camc.exe!boost::asio::detail::select_reactor::shutdown_service() Line 73 C++ > camc.exe!boost::asio::detail::service_registry::~service_registry() Line 42 > + 0xf bytes C++ > camc.exe!boost::asio::detail::service_registry::`scalar deleting > destructor'() + 0x16 bytes C++ > camc.exe!boost::asio::io_service::~io_service() Line 51 + 0x1f bytes C++ > camc.exe!boost::asio::io_service::`scalar deleting destructor'() + 0x16 > bytes C++ May be the source of your problem is located in yours async write completion handler (it is often so - see asio-users mailing list). It seems that your completion handler tries to use destroyed m_socket. Regards, Marat Abrarov.

3 5

algorithm question
by Peter Foelsche 09 Jul '11

09 Jul '11

Dear All, I'm trying to get some objects sorted. Every object has a set of pointers to other objects, which need to come before this object (or are considered smaller than this object). It is kind of a make-tool algorithm. I can imagine the straight-forward way to attack this -- searching. Is there some more elegant way I'm missing? The number of objects not small. I tried to write some recursive functor to be passed to std::sort -- caching the result of previous comparisions -- but I was not successful. My brain is hurting... Thanks Peter struct object { std::set<object*> m_sPredecessors; }; // to be sorted: std::list<object*> sList; std::list<object*> sort(std::list<object*> _sList) { std::set<object*> sSet; std::list<object*> sSorted; while (_sList.size()) for (std::list<object*>::iterator p = _sList.begin(), pNext = p, pEnd = _sList.end(); p != pEnd; p = pNext) { ++pNext; bool bFound = false; for (std::set<object*>::const_iterator p1 = (*p)->m_sPredecessors.begin(), p1End = (*p)->m_sPredecessors.end(); p1 != p1End; ++p1) if (sSet.find(*p1) == sSet.end()) { bFound = true; break; } if (!bFound) { sSorted.push_back(*p); _sList.erase(p); } } return sSorted; }

2 4

Multi Index Container - find() not working with std::string, kind of stuck...
by Steve Hibbert 09 Jul '11

09 Jul '11

Hi, I've hit a snag with the Boost Multi Index Container, and I'd really appreciate some help. I've set up a container and I am using it to store shared pointers to custom objects. The custom objects are just data collections effectively, including std::strings, chars, ints etc. The problem is that when I try to find a string in the MIC, the find function sometimes succeeds, and sometimes returns the same iterator as .end(), indicating a failure to find. Yet, if I iterate through the container testing the strings, the string is always found. I've done something wrong, but I do not know what it is. Here's the container definition... typedef boost::multi_index::multi_index_container < spExchOrder, boost::multi_index::indexed_by < boost::multi_index::ordered_unique // 0 index - shared pointer index < boost::multi_index::identity<spExchOrder> > , boost::multi_index::ordered_unique // 1 index - Exchange ID eg "ORD-WIDGET-Timestamp" < boost::multi_index::const_mem_fun< FC::ExchOrder, std::string, &FC::ExchOrder::ID > > , boost::multi_index::ordered_unique // 2 index - OrigDetails eg "CLIENTA|ORDER00123" < boost::multi_index::const_mem_fun< FC::ExchOrder, std::string, &FC::ExchOrder::origDetails > > > > OrderReg; The spExchOrder typedef is just a std::tr1 shared pointer to an FC::ExchOrder object. This object has member functions that return the ID and origDetails member variable data as std::string type. Both are guaranteed unique. I'm searching the MIC using this kind of code: std::string sExchID = "Passed in Exchange ID"; OrderReg::nth_index<1>::type::iterator i = m_regOrders.get<1>().find( sExchID ); OrderReg::nth_index<1>::type::iterator iEnd = m_regOrders.get<1>().end(); if ( i != iEnd ) { // Found, do what needs to be done } I add shared pointers to the MIC like this: m_regOrders.insert(spOrder); When needed, shared pointers are deleted like this: OrderReg::nth_index<0>::type& indexSP = m_regOrders.get<0>(); iDelCount = indexSP.erase(spOrder); Any help with this would be greatly appreciated. Multi Index Containers have sorted out a number of problems for me, but I can't get past this issue. Thanks in advance, Steve

1 1

Metaprogamming question
by John M. Dlugosz 09 Jul '11

09 Jul '11

I roughed out a function that will be a template that dispatches to one of several different forms based on the nature of one of the arguments. It's fairly simple, each helper call asking one question to further divide it up. But, I want to write a dozen functions that all have similar (if not identical) issues. So I want to abstract out the mixmaster and code that once. I'm thinking that I map the argument to a "tag" that has many possible values, and have one set of overloaded functions. It is easy to write the back end, as each function's tag is clear what that case is for. Furthermore, I can make the tags empty structs that use an inheritance pattern, so any forms I don't supply for some function will simply pick the more general one. So, how do I write the metafunction that maps the type to the tag? I could follow my same approach of one step at a time. But I wonder if a "switch" statement of some kind would be clearer and easier. OTOH, I don't want to learn all of MPL just for one thing, and I don't want to bog down the compilation speed. Is there something specific someone can point me to? Second, my pseudocode has a metafunction for telling me whether a type is a resizable container. STL containers predate the modern style of metafunctions and use cumbersome traits instead, but is there something around that I can use to tell that something is supposed to be a STL container or specific categories of containers? I could just list them all one by one, but type_traits already did that for me for a lot of things, and I'd have to tell everyone how to meta-annotate their own classes that are supposed to work "like" STL containers for algorithms. Can I use something like enable_if to tell if a class has a push_back or resize function? Thanks everyone, --John

5 4

Boost.Operators on a POD class
by Krzysztof Czainski 08 Jul '11

08 Jul '11

Hello, A simplified example of what I am trying to accomplish follows: // needs to be a POD struct Point { double x, y; // some functions... }; Now I would like Point to be additive, and multiplicative by double, so normally I'd write: struct Point : additive1< Point, multiplicative2< Point, double > > { // supply the needed operators, and let Boost.Operators do the rest }; But Point needs to be POD, and inheritance kills POD-ness. So I'm wondering, can Boost help me here? Regards, Kris

1 0

Boost in X-Code 4
by Mark Schisler 08 Jul '11

08 Jul '11

When compiling for the iPhone simulator with the following command: ./bjam --prefix=/Downloads/boost_install/ toolset=darwin architecture=x86 target-os=iphone macosx-version=iphone-${SDK_VERSION} --with-date_time --with-regex --with-thread link=static install And the following user-config.jam: using darwin : 4.2.1~iphone : /Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/llvm-g++-4.2 : <striper> <compileflags>"-arch armv7" <compileflags>-mthumb <compileflags>-D_LITTLE_ENDIAN : <architecture>arm <target-os>iphone ; using darwin : 4.2.1~iphonesim : /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/llvm-g++-4.2 : <striper> <compileflags>"-arch i386" <compileflags>-D_LITTLE_ENDIAN : <architecture>x86 <target-os>iphone ; using darwin : 4.2.1~darwin : /Developer/usr/bin/gcc : <striper> <compileflags>"-arch i386" <compileflags>"-arch x86_64" : <architecture>x86 <target-os>darwin I receive the following linker error when I attempt to link against the reg ex library: ld: bad codegen, pointer diff in boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::runtime_error> >::rethrow() constto global weak symbol vtable for boost::exceptionfor architecture i386 collect2: ld returned 1 exit status Command /Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/g++-4.2 failed with exit code 1 I've noticed that many people have managed to get around this error by hiding boost's symbols, however, that doesn't seem to be the preferred approach as it requires hiding all of my projects symbols, which will prevent me from being able to handle exceptions according to Apple docs: > If your symbol uses runtime type identification (RTTI) information, > exceptions, or dynamic casts for an object that is defined in another > library, your symbol must be visible if it expects to handle requests > initiated by the other library. For example, if you define a catch > handler for a type in the C++ standard library, and you want to catch > exceptions of that type thrown by the C++ standard library, you must > make sure that your typeinfo object is visible. Is there another approach to fixing this linker error? Thanks, Mark

1 1

stop a socket
by Gianni Ambrosio 08 Jul '11

08 Jul '11

Hi All, I would like you to explain me a detail of io_service. In my case I attach a socket to the io_service but if the socket is still open the io_service.stop() does not work as expected. Is there a way to close the socket just through the related io_service? Regards Gianni

2 1

[pool] Memory usage with boost::pool
by Daniele Barzotti 08 Jul '11

08 Jul '11

Hi, in my project I try to use boost::pool to handle memory allocation/deallocation. I have a MemoryManager object with two simple methods: void* WaveStreamMM::AllocateBuffer(size_t numbytes, int memtype) { boost::mutex::scoped_lock lock(m_mutex); void *buf = m_pool.ordered_malloc(numbytes); memset(buf, 0, numbytes); return buf; } void WaveStreamMM::FreeBuffer(void *p) { boost::mutex::scoped_lock lock(m_mutex); m_pool.free(p); } If I use the code above, the memory usage of my application increase over the time, while if I substitute the allocation/deallocation respectively with: void *buf = malloc(numbytes); and free(p); the memory usage remains constant. I wrong something? Regards, Daniele.

1 0

boost::asio::tcp -> asyncconnect generates multiple sockets
by Hert 08 Jul '11

08 Jul '11

hello, I noticed that when asynchronously connecting to an acceptor on localhost using boost::asio::ip::tcp::socket generates 2 TCP sockets on the system. One to the acceptor and one to the other one. Stepping into the code I can see where it is done, but I don't understand why. So why is this extra TCP socket there? thanks in advance, Gert -- View this message in context: http://boost.2283326.n4.nabble.com/boost-asio-tcp-asyncconnect-generates-mu… Sent from the Boost - Users mailing list archive at Nabble.com.

2 2

[thread] set thread affinity
by James C. Sutherland 08 Jul '11

08 Jul '11

Is it possible to set thread affinity through boost::thread? I suspect that I am losing performance in my application because the OS is migrating threads and causing cache thrashing... James

2 1

ct_if.hpp
by Simon Knapp 08 Jul '11

08 Jul '11

Hi List, I was looking at the file boost/pending/detail/property.hpp and noted that boost::ct_if was used therein. I think this must have come from boost/pending/ct_if.hpp (but that header is not included?), which no longer exists in boost version 1.46.1. This is the only reference to boost::ct_if I can find within the boost distribution. I was wondering if this is just old code that is not used anywhere (any more), or if I am missing something?

2 2

[Graph] Assertion in two_bit_color_map
by Maxime van Noppen 07 Jul '11

07 Jul '11

Hi, I'm getting an assertion failure that I don't understand. /usr/include/boost/graph/two_bit_color_map.hpp:86: void boost::put(const boost::two_bit_color_map<IndexMap>&, typename boost::property_traits<PropMap>::key_type, boost::two_bit_color_type) [with IndexMap = boost::vec_adj_list_vertex_id_map<boost::property<boost::vertex_bundle_t, trade_graph::vertex, boost::no_property>, long unsigned int>, typename boost::property_traits<PropMap>::key_type = long unsigned int]: Assertion `(std::size_t)i < pm.n' failed. It's triggered by a call to dijkstra. I've attached the relevant part of the backtrace to this mail. There's a lot of code involved and can't reproduce a minimal test-case. Here's the call to dijkstra: cost_map_t cmap(boost::num_vertices(cg)); predecessor_map_t pmap(boost::num_vertices(cg)); boost::dijkstra_shortest_paths(cg, src_rp->position(), boost::predecessor_map(&pmap[0]). distance_map(&cmap[0]).weight_map( make_function_property_map<edge_t> (boost::bind(&transaction::edge_cost_, this, _1, boost::ref(g), quantity, src, dst)))); Any idea greatly appreciated, thanks! -- Maxime

1 1

Storing vertex descriptors when removing a vertex
by Orianne Siret 07 Jul '11

07 Jul '11

Hi all, I am using the boost graph library for my project and encountered a small problem I don't know how to solve. I had to keep in an extern storage some of the vertex_descriptor in order to have access to their adjacent vertices and their properties. But as it is written in the boost documentation, when I remove a vertex, the vertex_descriptors change and I am not able to keep the right ones in my storage. Is there something else apart from vertex_descriptor that won't change but from which I could also access adjacent vertices and properties ? Thank you in advance for your help. Orianne

2 1

More Boostcon videos available
by Marshall Clow 07 Jul '11

07 Jul '11

Monday: Micheal Wong - C++0x Progress and status http://blip.tv/boostcon/c-0x-progress-and-status-5349952 Ruediger Berlich - Distributed parametric optimization with the Geneva library http://blip.tv/boostcon/distributed-parametric-optimization-with-the-geneva… Tuesday: Joel Falcou - Automatic Hybrid MPI+OpenMP Code Generation http://blip.tv/boostcon/automatic-hybrid-mpi-openmp-code-generation-5349961 Sebastian Schaetz - Mastering the Cell Broadband Engine architecture through a Boost based parallel communication library http://blip.tv/boostcon/mastering-the-cell-broadband-engine-architecture-th… Beman Daves -- The proposed Boost B-tree library http://blip.tv/boostcon/the-proposed-boost-b-tree-library-5349968 Boris Kolpackov - Parsing C++ with GCC plugi http://blip.tv/boostcon/parsing-c-with-gcc-plugins-5349971 More next week.... -- Marshall Marshall Clow Idio Software <mailto:mclow.lists@gmail.com> A.D. 1517: Martin Luther nails his 95 Theses to the church door and is promptly moderated down to (-1, Flamebait). -- Yu Suzuki

1 0

xml_oarchive to a iostream
by Sillence, Martin (GE Oil & Gas) 07 Jul '11

07 Jul '11

Hi, Am I missing something or is there no way to serialise to a network stream? Using the blocking method for sending and receiving I have a boost::asio::ip::tcp::iostream and need a boost::archive::xml_oarchive to serialise to/from unfortunately I can't work out how to create a xml_oarchive from the network iostream. I see from the examples most people are serialising to a buffer and then sending that but it would be much neater to be able to use a stream directly. Am I missing something or is this a gap? Thanks, M

1 0

Threads and virtual functions
by Geoffrey 07 Jul '11

07 Jul '11

Hello, here is a simplified code I wrote: class A{ public: A(); ~A(); void Run(); void ThreadA(); virtual void HandleSomething(); }; void A::HandleSomething() { } void A::ThreadA() { if(condition) { HandleSomething(); } } void A::Run() { boost::thread thread(&A::ThreadA,this); } This is my base class. As you can see the thread calls the virtual function when the condition becomes true. I use the virtual function in my derived class so everytime the condition becomes true the function HandleSomething() should do something. So far, so good but when I try to change some variables in the derived class the program crashes without any warning or error message. I use the latest Ubuntu version with GCC 4.5.3 and boost 1.46.1.

3 3

[chrono] Intel Composer XE 2011 unable to compile chrono library
by Edward Rankin 06 Jul '11

06 Jul '11

Hi, The purpose of this email is to get some insight on the problem we faced when trying to compile chrono from the 1.47 Beta 1 package. I have tried both the latest released compiler (2011 Update 4) and the current SP1 beta. There is no issue with VS 2010 SP1's compiler. It was first surfaced here: http://comments.gmane.org/gmane.comp.lib.boost.user/68421. The error received can be seen below: < snip > chrono.cpp .\boost/chrono/duration.hpp(94): error: expected an expression && (boost::is_convertible<Rep2, ^ .\boost/chrono/duration.hpp(124): error: expected an expression && (boost::is_convertible<Rep, ^ < snip > After some discussion with Vicente and some testing by me, it turns out that Intel was not happy with the first operand of the && operator in the following snippet of code: template <class Duration, class Rep2, bool = ( (boost::is_convertible<typename Duration::rep, typename common_type<typename Duration::rep, Rep2>::type>::value) && (boost::is_convertible<Rep2, typename common_type<typename Duration::rep, Rep2>::type>::value) ) > struct duration_divide_imp { }; If we place an additional parenthesis around that first operand like this: template <class Duration, class Rep2, bool = ( ( (boost::is_convertible<typename Duration::rep, typename common_type<typename Duration::rep, Rep2>::type>::value) ) && (boost::is_convertible<Rep2, typename common_type<typename Duration::rep, Rep2>::type>::value) ) > struct duration_divide_imp { }; It will happily compile. It is rather bizarre that this is necessary, which leads Vicente and I to believe that there is a bug in the Intel Compiler. What do you guys think? I have also posted to the Intel forums, the thread can be seen here: http://software.intel.com/en-us/forums/showthread.php?t=84061 Regards, Edward

4 3

[units] combined systems and prefixes and output
by alfC 06 Jul '11

06 Jul '11

Hi, After some effort I managed to add a new system to boost units (namely "atomic"). The system works so far until I start using si prefixes in combination and printing int main(){ clog << 4.*atomic::hbar << endl; // output: 4 hbar clog << 4.*(si::femto*si::second) << endl; // output: 4 fs clog << 4.*(atomic::hbar/si::second) << endl; // output: 4 s^-1 hbar auto a = atomic::hbar/(si::femto*si::second); // ok clog << a << endl; // output: P(s^-1 hbar) auto b = 4.*atomic::hbar/(si::femto*si::second); // ok clog << b << endl; // error!!!! why? return 0; } As you see all lines work as expected except for the last line. Is there a workaround? do I need to define prefixes specific for the other system of units? The error message boils down to: usr/include/boost/units/detail/linear_algebra.hpp:197:48: error: no type named ‘item’ in ‘struct boost::units::list<boost::units::list<boost::units::static_rational<0l, 1l>, boost::units::list<boost::units::static_rational<1l>, boost::units::dimensionless_type> >, boost::units::dimensionless_type>::next’ also I defined hbar as struct reduced_planck_constant_base_unit : base_unit< reduced_planck_constant_base_unit, action_dimension, 3 >{ static string name(){return ("reduced Planck constant");} static string symbol() {return ("hbar");} }; static const action hbar;

1 0

accumulators doc typo?
by Olaf Peter 06 Jul '11

06 Jul '11

Hi, at http://www.boost.org/doc/libs/1_46_1/doc/html/accumulators/user_s_guide.html in the example of section 'Droppable Accumulators' one can read // This will display "6 2 3" std::cout << sum(acc) << ' ' << count(acc) << ' ' << mean(acc); The text below says 'Note that at the point at which mean is dropped, sum is 3, count is 2, and therefore mean is 1.5'. After calculating my result is also 1.5 - the comment in the example isn't correct, isn't it? Probably the typo is in the upcoming release 1.47 too. Regards, Olaf

2 1

[bimap] initializing from range of pair<T&, U&> elements
by Nathan Ridge 06 Jul '11

06 Jul '11

Hello, I am trying to initialize a bimap<T, U> with a vector<pair<T&, U&>> (the "vector" part isn't important, any range with elements of type pair<T&, U&> has the same effect), but I'm getting a rather monstrous compiler error. The same initialization works for std::map<T, U>. Here is the code: #include <boost/bimap.hpp> #include <boost/range/begin.hpp> #include <boost/range/end.hpp> #include <vector> #include <map> #include <utility> int main() { int i1, i2; float f1, f2; std::vector<std::pair<int&, float&>> myvec{{i1, f1}, {i2, f2}}; std::map<int, float> m(boost::begin(myvec), boost::end(myvec)); // WORKS boost::bimap<int, float> b(boost::begin(myvec), boost::end(myvec)); // FAILS } The compiler errors are shown below. It seems to me this should work. As with std::map, the pair-of-iterators constructor should call something like insert(const value_type&) for each element of the range, where value_type is something like pair<const T, U> which should be constructible from pair<T&, U&>, the element type of the range. Why is this not working? Thanks, Nate. P.S. Here are the errors: In file included from B:\Dev\Libraries\boost/boost/bimap/detail/bimap_core.hpp:34:0, from B:\Dev\Libraries\boost/boost/bimap/bimap.hpp:61, from B:\Dev\Libraries\boost/boost/bimap.hpp:13, from test.cpp:1: B:\Dev\Libraries\boost/boost/multi_index_container.hpp: In constructor 'boost::multi_index::multi_index_container<Value, IndexSpecifierList, Allocator>::multi_index_container(InputIterator, InputIterator, boost::multi_index::multi_index_container<Value, IndexSpecifierList, Allocator>::ctor_args_list&, boost::multi_index::multi_index_container<Value, IndexSpecifierList, Allocator>::allocator_type&) [with InputIterator = __gnu_cxx::__normal_iterator<std::pair<int&, float&>*, std::vector<std::pair<int&, float&> > >, Value = boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true>, IndexSpecifierList = boost::bimaps::detail::bimap_core<int, float, mpl_::na, mpl_::na, mpl_::na>::core_indices, Allocator = std::allocator<boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true> >, boost::multi_index::multi_index_container<Value, IndexSpecifierList, Allocator>::ctor_args_list = boost::tuples::cons<boost::tuples::tuple<boost::multi_index::member<boost::bimaps::relation::detail::relation_storage<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, true>, float, &boost::bimaps::relation::detail::relation_storage<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, true>::right>, std::less<float>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, boost::tuples::cons<boost::tuples::tuple<boost::multi_index::member<boost::bimaps::relation::detail::relation_storage<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, true>, int, &boost::bimaps::relation::detail::relation_storage<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, true>::left>, std::less<int>, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, boost::tuples::null_type> >, boost::multi_index::multi_index_container<Value, IndexSpecifierList, Allocator>::allocator_type = std::allocator<boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true> >]': B:\Dev\Libraries\boost/boost/bimap/bimap.hpp:252:8: instantiated from 'boost::bimaps::bimap<KeyTypeA, KeyTypeB, AP1, AP2, AP3>::bimap(InputIterator, InputIterator, boost::bimaps::bimap<KeyTypeA, KeyTypeB, AP1, AP2, AP3>::allocator_type&) [with InputIterator = __gnu_cxx::__normal_iterator<std::pair<int&, float&>*, std::vector<std::pair<int&, float&> > >, KeyTypeA = int, KeyTypeB = float, AP1 = mpl_::na, AP2 = mpl_::na, AP3 = mpl_::na, boost::bimaps::bimap<KeyTypeA, KeyTypeB, AP1, AP2, AP3>::allocator_type = std::allocator<boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true> >]' test.cpp:15:70: instantiated from here B:\Dev\Libraries\boost/boost/multi_index_container.hpp:235:9: error: no matching function for call to 'boost::multi_index::multi_index_container<boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true>, boost::bimaps::detail::bimap_core<int, float, mpl_::na, mpl_::na, mpl_::na>::core_indices, std::allocator<boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true> > >::insert_(std::pair<int&, float&>&, boost::multi_index::detail::ordered_index_node<boost::multi_index::detail::ordered_index_node<boost::multi_index::detail::index_node_base<boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true>, std::allocator<boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true> > > > >*)' B:\Dev\Libraries\boost/boost/multi_index_container.hpp:484:30: note: candidates are: std::pair<typename boost::multi_index::detail::multi_index_base_type<Value, IndexSpecifierList, Allocator>::type::node_type*, bool> boost::multi_index::multi_index_container<Value, IndexSpecifierList, Allocator>::insert_(const Value&) [with Value = boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true>, IndexSpecifierList = boost::bimaps::detail::bimap_core<int, float, mpl_::na, mpl_::na, mpl_::na>::core_indices, Allocator = std::allocator<boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true> >, typename boost::multi_index::detail::multi_index_base_type<Value, IndexSpecifierList, Allocator>::type::node_type = boost::multi_index::detail::ordered_index_node<boost::multi_index::detail::ordered_index_node<boost::multi_index::detail::index_node_base<boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true>, std::allocator<boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true> > > > >] B:\Dev\Libraries\boost/boost/multi_index_container.hpp:505:30: note: std::pair<typename boost::multi_index::detail::multi_index_base_type<Value, IndexSpecifierList, Allocator>::type::node_type*, bool> boost::multi_index::multi_index_container<Value, IndexSpecifierList, Allocator>::insert_(const Value&, boost::multi_index::multi_index_container<Value, IndexSpecifierList, Allocator>::node_type*) [with Value = boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true>, IndexSpecifierList = boost::bimaps::detail::bimap_core<int, float, mpl_::na, mpl_::na, mpl_::na>::core_indices, Allocator = std::allocator<boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true> >, typename boost::multi_index::detail::multi_index_base_type<Value, IndexSpecifierList, Allocator>::type::node_type = boost::multi_index::detail::ordered_index_node<boost::multi_index::detail::ordered_index_node<boost::multi_index::detail::index_node_base<boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true>, std::allocator<boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true> > > > >, boost::multi_index::multi_index_container<Value, IndexSpecifierList, Allocator>::node_type = boost::multi_index::detail::ordered_index_node<boost::multi_index::detail::ordered_index_node<boost::multi_index::detail::index_node_base<boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true>, std::allocator<boost::bimaps::relation::mutant_relation<boost::bimaps::tags::tagged<const int, boost::bimaps::relation::member_at::left>, boost::bimaps::tags::tagged<const float, boost::bimaps::relation::member_at::right>, mpl_::na, true> > > > >] mingw32-make: *** [test.exe] Error 1

1 0

[asio] [thread] Code review for correct use of boost sockets and threads
by Konrad Reiche 06 Jul '11

06 Jul '11

Hello everyone, I am using the boost library now for a couple of weeks. Unfortunately I've run into some problems with my C++ code and I would like to make sure that these problems are not caused due to incorrect use of boost. So basically I've written a small class which is suppossed to take messages and send them asynchronously. If there are more messages than can be processed, they queue up. The code is mainly based on the tutorial code provided on the boost website: http://www.boost.org/doc/libs/1_39_0/doc/html/boost_asio/tutorial/tutdaytim… I have 2 questions: 1. The constructor launches the threads, from this point on I want to be able to queue up messages, which are processed afer that by using the function MessageService::write. Is there any possible problem which could occur due to buffer or thread issues? Because sometimes the messages are not processed until the end and when they are processed they are corrupted. 2. Sometimes the messages are not processed when the application would quit. I have to make sure, that the messages are sent at least at the end. Sometimes there are 10.000+ messages queued up, so this might take a bit time. For this I've wrote MessageService::await(). It seems really bogus to me. I am checking the pending messages left for the following reason: When the host I am connecting to does not listen on the port I am connecting to, I don't receive an error by the functions I am using. So the messages are queued up and nothing happens. I don't know why. Have I forgot any checking whether the connection could be established? In the hope my question is not too generic, I would be really grateful for any advice. I am sorry I could not provide any specific errors, but this is due to the reason all the problems evolve on the client side by receiving corrupted messages. - Konrad /* * MessageService.cpp * * Created on: 04.06.2011 * Author: Konrad Johannes Reiche */ #include "MessageService.h" using namespace google::protobuf::io; using boost::asio::ip::tcp; MessageService::MessageService(std::string ip, std::string port) : work(io_service), resolver(io_service), socket(io_service) { messageQueue = new std::deque<AgentMessage>; tcp::resolver::query query(ip, port); endpoint_iterator = resolver.resolve(query); tcp::endpoint endpoint = *endpoint_iterator; socket.async_connect(endpoint, boost::bind(&MessageService::handle_connect, this, boost::asio::placeholders::error, ++endpoint_iterator)); boost::thread t(boost::bind(&boost::asio::io_service::run, &io_service)); } void MessageService::await() { while (!messageQueue->empty()) { signal(SIGINT, exit); int messagesLeft = messageQueue->size(); sleep(3); std::cout << "Pending Profiler Agents Messages: " << messageQueue->size() << std::endl; if (messagesLeft == messageQueue->size()) { std::cout << "Connection Error" << std::endl; break; } } } void MessageService::write(AgentMessage agentMessage, long systemTime, int JVM_ID) { agentMessage.set_timestamp(Agent::Helper::getCurrentClockCycle()); agentMessage.set_jvm_id(JVM_ID); agentMessage.set_systemtime(systemTime); io_service.post(boost::bind(&MessageService::do_write, this, agentMessage)); } void MessageService::do_close() { socket.close(); } void MessageService::transmitMessage(AgentMessage agentMessage) { boost::asio::streambuf b; std::ostream os(&b); ZeroCopyOutputStream *raw_output = new OstreamOutputStream(&os); CodedOutputStream *coded_output = new CodedOutputStream(raw_output); coded_output->WriteVarint32(agentMessage.ByteSize()); agentMessage.SerializeToCodedStream(coded_output); delete coded_output; delete raw_output; boost::system::error_code ignored_error; boost::asio::async_write(socket, b.data(), boost::bind( &MessageService::handle_write, this, boost::asio::placeholders::error)); } void MessageService::do_write(AgentMessage agentMessage) { bool write_in_progress = !messageQueue->empty(); messageQueue->push_back(agentMessage); if (!write_in_progress) { transmitMessage(agentMessage); } } void MessageService::handle_write(const boost::system::error_code &error) { if (!error) { messageQueue->pop_front(); if (!messageQueue->empty()) { transmitMessage(messageQueue->front()); } } else { std::cout << error << std::endl; do_close(); } } void MessageService::handle_connect(const boost::system::error_code &error, tcp::resolver::iterator endpoint_iterator) { // can be used to receive commands from the Java profiler interface } MessageService::~MessageService() { // TODO Auto-generated destructor stub }

2 1

Re: [Boost-users] weird Google page when I try to search boost.org
by Richard L. Aurbach 05 Jul '11

05 Jul '11

I get it too. Simple query using both Safari and FireFox on Mac OS X. And on these browsers at this time (7/5/2011 3pm CDT) adding site:www.boost.org to the query doesn't help either... 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 "Elitism is the slur directed at merit by mediocrity." - Sydney J. Harris, journalist (1917-1986) "Life is easy to chronicle, but bewildering to practice." - E.M. Forster (1879-1970) "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. (1929-1968) "The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom." -Isaac Asimov (1920-1992) "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) "You can judge your age by the amount of pain you feel when you come in contact with a new idea." - John Nuveen (1896-1968) “The scientific theory I like best is that the rings of Saturn are composed entirely of lost airline luggage.” - Mark Russell (1932- )

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Specifying of the filesystem3::path for custom strings using
by Iurii Gordiienko 05 Jul '11

05 Jul '11

Hi I tried to specify the boost::filesystem3::path to use my custom string (icu based) but in result I have error during my code compiling and I can't solve it... I have this issue under Linux, because under Windows ICU has equal with boost char-representation (wchar_t), but under Linux these values are different. The attach has error-screenshot and part of code which has conversion specification etc... Please, help Thanks -- Iurii Gordiienko

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weird Google page when I try to search boost.org
by Robert Ramey 05 Jul '11

05 Jul '11

http://www.google.com/custom?cof=LW%3A277%3BL%3Ahttp%3A%2F%2Fwww.boost.org%… I'm getting a weird response from google when i use the search box on the page www.boost.org. It says: We're sorry... ... but your computer or network may be sending automated queries. To protect our users, we can't process your request right now. See Google Help for more information. I've been getting for about two weeks. Originally I thought it was just a temporary thing. It hasn't gone away and now I'm wonder it if it's just me. I only get it when I use the boost.org search box. Anyone else get this? Robert Ramey

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