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[Boost.Signals] set_connection
by gast128 24 Aug '11

24 Aug '11

Hello all, I use the 'set_controlling' function for automatic disconnect when the connection goes out of scope. This is quite handy but not documented. Is it an implementation detail not to be used ordinary mortals or a small documentation mismatch? Also the reference section of the documentation mentions that scope_connection's are noncopyable but in fact u can just copy them (with all consequences). Is this a documentation overlook (I would think that marking them as noncopyable is safer). I use Boost 1.47

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multi_array with large dimensions crashes
by Jothy 24 Aug '11

24 Aug '11

Hi all, I have just started to use boost libs. I am trying to create a large float array (mandatory for my purpose). it works fine till certain limit, but crashes above that. I think it about allocating memory in the stack. My code is like this typedef boost::multi_array<float,3> array_type; typedef array_type::index index; array_type Array(boost::extents[xDim][yDim][zDim]);//500,300,400 for instance Can some one help me to resolve this? Thanks Jothy

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Re: [Boost-users] Boost.Serialization: Error on Calling Class Method during serialization process
by Alex Perry 24 Aug '11

24 Aug '11

Hazrat Pradipta Ranjali <mrdipta(a)gmail.com> wrote :- > I have the following problem when I try to call method in "TestSerialize" > class during serialization process. > > Here is my code: > > class TestSerialize > { > public: > std::string GetVal() { return Val + "abc"; } > void SetVal(std::string tVal) { Val = tVal.substr(0, 2); } GetVal() needs to be declared as const HTH Alex

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[phoenix] Simple bind example not compiling
by Gabriel Redner 24 Aug '11

24 Aug '11

Hi all, I am trying to compile the phoenix::bind example partially laid out here: http://www.boost.org/doc/libs/1_47_0/libs/phoenix/doc/html/phoenix/modules/… The code, with #includes and using decls added, is: ========== #include <boost/phoenix/bind/bind_function.hpp> #include <boost/phoenix/core/argument.hpp> #include <iostream> using namespace boost::phoenix; using namespace boost::phoenix::placeholders; void foo(int n) { std::cout << n << std::endl; } int main() { bind(&foo, arg1)(4); } ========== However, the compiler (g++ 4.4.5) complains: /home/gredner/main.cpp: In function ‘int main()’: /home/gredner/main.cpp:16: error: no matching function for call to ‘bind(void (*)(int), const boost::phoenix::actor<boost::proto::exprns_::basic_expr<boost::proto::tag::terminal, boost::proto::argsns_::term<boost::phoenix::argument<1> >, 0l> >&)’ What am I doing wrong? I also tried fully-qualifying 'bind' and 'arg1', but got the same results. Also, there is no simple bind example under libs/phoenix/examples - in light of this sort of problem, it would be very nice to have one. Thanks, -Gabe

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Program Options / Windows command line
by asif saeed 24 Aug '11

24 Aug '11

Hi, The page at http://www.boost.org/doc/libs/1_47_0/doc/html/program_options/howto.html#id… says that the "split_winmain function is a portable mechanism provided by the library." Does that mean that the same code (containing the split_winmain function, that is) will also run on Linux, for example? I guess it would return normal args on Linux. Could you elaborate please? In addition, could you please post a link to a cookbook-type recipe for parsing windows command-line (that parses linux/unix command line as well)? Are there any tutorials to get up to speed with program options - especially, the windows command-line parsing stuff? Best regards, Asif

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[thread] boost::this_thread::get_id causing interrupt
by Yi Ding 24 Aug '11

24 Aug '11

Hi everyone, I've been dipping my toes into boost threads, and I'm running into a strange issue. What I'm trying to do is to run a comparison between thread_ids. I have an object that's "owned" by a thread, and when something calls one of its functions, I'd like to compare the thread_id to the owner's thread id. So I thought that boost::this_thread::get_id would do the trick to figure out what the current running thread's thread id is. For some reason, when I call it, an interrupt is signalled to my main thread. Is boost::this_thread::get_id not the right thing to use here? Thanks in advance, Yi

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Boost.Conversion review
by Gordon Woodhull 23 Aug '11

23 Aug '11

Hi all, The review of Vicente Botet Escriba's Conversion library starts this Saturday August 20 and continues through August 29. This library provides a general system for type-to-type conversion. As such, it can be thought of either as a substitute for overloading static_cast, or as an alternative to lexical_cast when the intermediate conversion to text is not wanted. The code is in the sandbox: http://svn.boost.org/svn/boost/sandbox/conversion/ And the docs are here: http://svn.boost.org/svn/boost/sandbox/conversion/libs/conversion_ext/doc/h… I'll send out a formal announcement when the review begins, but I wanted to send out this reminder because participation in summer months tends to be somewhat low. Your review and/or discussion would be greatly appreciated. As always, please post to the main Boost list if possible, or the boost-users list, or you can send your review directly to the Review Managers. Thanks, Gordon Woodhull, Review Manager Espen Harlinn, Review Manager Assistant

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Re: [Boost-users] [IOStream] issue
by Sean Farrow 23 Aug '11

23 Aug '11

Hi: I forgot to include the error in the last message. The error is: error C2039: 'category' : is not a member of 'std::basic_string<_Elem,_Traits,_Ax>' traits.hpp 242 1 Surface Reader visual studio 2010, windows 7.1 sdk. Cheers Sean.

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[iostreams] issue
by Sean Farrow 23 Aug '11

23 Aug '11

Hi: I am writing some serialization code that uses IOStreams as a filter. The following is the class I am trying to serialize. class MIDISurface { public: // surface variables std::wstring strSurfaceName; }; The string header file is included. I then have a template function as follows: template <class SerializingType> void SaveData(SerializingType Data, boost::filesystem::path FileName, bool EncryptData) { //Check file existance. if (boost::filesystem::exists(FileName)) //Delete file boost::filesystem::remove(FileName); //Now create a WOfstream to serialize the data. std::wofstream OutputStream(FileName.generic_wstring()); //Create a filtering_stream to allow us to encrypt the data if necessary. boost::iostreams::wfiltering_stream<boost::iostreams::output> FilteringStream(FileName.generic_wstring()); if (EncryptData) //FilteringStream.push(test); //add the encryption filter defined in Encryption.hpp. FilteringStream.push(OutputStream); boost::archive::xml_woarchive Archive(FilteringStream); //create an archive and assign the filtering stream. Archive << BOOST_SERIALIZATION_NVP(Data); } I am including the following headers. //Standard c++ headers. #include <fstream> #include <stdlib.h> #include <string> #include <boost/iostreams/traits.hpp> //boost filesystem headers. #include <boost/config.hpp> #define BOOST_FILESYSTEM_VERSION 3 #include <boost/filesystem/operations.hpp> #include <boost/filesystem/path.hpp> //Boost xml serialization headers. #include <boost/archive/xml_wiarchive.hpp> #include <boost/archive/xml_woarchive.hpp> //Data type boost serialization headers. #include <boost/config.hpp> #include <boost/serialization/string.hpp> #include <boost/Serialization/Vector.hpp> #include <boost/Serialization/Map.hpp> #include <boost/Serialization/nvp.hpp> //boost io streams header. #include <boost/iostreams/detail/config/wide_streams.hpp> #include <boost/iostreams/concepts.hpp> #include <boost/iostreams/detail/ios.hpp> // BOOST_IOS. #include <boost/iostreams/filter/stdio.hpp> #include <boost/iostreams/operations.hpp> #include <boost/iostreams/filtering_stream.hpp> I am using boost 1.47, from the installer from boost pro computing. Can anyone point in the direction of the solution. Any help appreciated. Sean

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[Serialization | Multi-Array] About the array.hpp header
by Júlio Hoffimann 23 Aug '11

23 Aug '11

Dear all, After read the "Optimizations" section of Boost.Serialization docs ( http://www.boost.org/doc/libs/1_47_0/libs/serialization/doc/special.html#op…) i get confused about the need to include/use array.hpp header with std::vector<>. I just need to include <boost/serialization/vector.hpp> and all is done, correct? Furthermore, i'm wondering if there is some header to include for serialize boost::multi_array<> class without doing myself the overload of the "array wrapper" and serialization member functions. Thanks in advance, Júlio.

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