- Boost-users - lists.boost.org

class API return a const&, optional, shared_ptr
by Hicham Mouline 25 Nov '08

25 Nov '08

hello, I have a class A that holds a container of objects of type B indexed by int for e.g. Typically, I have a function of A class A { public: const B& getB(int <index> ) const; private: std::map< int, shared_ptr<B> > listOfBs_; }; The implementation of getB could be const B& A::getB(int <index> ) const { //what to do if index not found } A number of solutions I think of: 1. boost::optional<const B&> getB(int <index> ) const { } 2. change signature to const B* getB(int <index> ) const 3. Define a static const B notFoundB; const B& A::getB(int <index> ) const returns notFoundB when not found and have API users compare return value with notFoundB I suppose the cheapest in overhead/performance is 2... optional must have some time overhead? Are there advised solutions? Favourites in terms of style? Regards,

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[Proto] Accessing nary_expr tag in transform
by Joel Falcou 25 Nov '08

25 Nov '08

I have a nary_expr grammar rule and in its associated tranform, I want to retrieves the actual tag. when< nary_expr<_ , bp::vararg<my_grammar> > , some_transform_using_the_tag(bp::_tag) > obviously proto::_tag doesn't exist. How can I retrieve this information ?

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[SSL - Memory Leak] Adding include <boost/asio/ssl.hpp>
by Ariel Somaschini 25 Nov '08

25 Nov '08

In a simple example of Hello World, created with Microsoft VC 2008 Express Edition on Windows and Linux with KDevelop, to add include <boost/asio/ssl.hpp> produces a Memory Leak. In the case of Windows, using DevPartner, it detects the file openssl_init.hpp on line 84. In the case of Linux, still report valgrind reachable 48 bytes in 3 blocks. The example is very simple: #ifdef HAVE_CONFIG_H #include <config.h> #endif #include <iostream> #include <cstdlib> #include <boost/asio/ssl.hpp> // Memory Leak using namespace std; int main(int argc, char *argv[]) { cout << "Hello, world !" << endl; return EXIT_SUCCESS; } Can somebody help me? Thx Ariel _________________________________________________________________

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Boost and Visual C++ 6.0
by Gbedemah, Henry 25 Nov '08

25 Nov '08

I am trying to use a boost library version 1.37.0 (date time specifically) with visual C++ 6.0 , the "Getting started" instructions indicate the libraries need to be recompiled, so far I have not been successful and would like to know if it is possible to use this version with Visaul Studio 6.00. Thanks Henry This email, including any attached files, may contain confidential and privileged information for the sole use of the intended recipient(s). Any review, use, distribution or disclosure by others is strictly prohibited. Distribution of sensitive technical material may violate applicable export and trade laws. If you are not the intended recipient or authorized to receive information for the recipient(s), please contact the sender by reply email and delete all copies of this message. E-mail may be susceptible to data corruption, interception, unauthorized amendment, viruses and delays or the consequences thereof. Accordingly this e-mail and any attachments are opened at your own risk . Unless expressly stated in this e-mail, nothing in this message should be construed as a digital or electronic signature.

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Boost version meaning
by vicente.botet 25 Nov '08

25 Nov '08

Hi, I would like to know what is the meaning of the 3 numbers on the Boost version X.Y.Z. When X changes, i.e. when we could have a Boost version 2.0.0 Which number means a complete rewriten? Which number means an incompatible evolution? Which number means new functions? Which number means major bugs corrections? Which number means only minor bugs corrections? Is this written somewhere? If we were to version individual Boost libraries which will be the apropiated schema? Should all the libraries follow the same schema? What do you think of? X: complete rewriten or incompatible evolution Y: new functions or major bugs corrections Z: minor bugs corrections Thanks, Vicente

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Maintenace Guidelines wiki page
by vicente.botet 25 Nov '08

25 Nov '08

Hi, I have started the Maintenace Guidelines wiki page. You can access it directly https://svn.boost.org/trac/boost/wiki/Guidelines/MaintenanceGuidelines or via https://svn.boost.org/trac/boost/wiki Guidelines * Maintenance Guidelines There page need to be completed and surely reworked but this is an starting point. Please be free to improve the page directly or post your comments or suggestions to this list. Hopping this goes on the right direction, Vicente

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Boost 1.37.0 and Borland C++ Builder 5 (compiler version 5.5/5.5.1)
by Marcin Kurek 24 Nov '08

24 Nov '08

Hello, I'm upgrading project which was originally developed using Borland C++ Builder 5. I need to do some parsing, so I thought I'd use Boost Regex. However, building regex with Borland C++ 5.5 (and 5.5.1) is an issue. There is no bcb5.mak included, so I use bjam: C:\boost_1_37_0\libs\regex\bjam --toolset=borland-5.5 (I tried --toolset=borland also) When I hit enter the only things I get are compiler errors... borland.compile.c++ ..\..\..\bin.v2\libs\regex\build\borland-5.5.1\debug\posix_a pi.obj ..\..\..\libs\regex\src\..\src\posix_api.cpp: Error E2404 ..\..\..\boost/regex/v4/basic_regex.hpp 195: Dependent type qualifie r 'c_regex_traits<char>' has no member type named 'string_type' in function __st dcall regcompA(regex_tA *,const char *,int) (...) Error E2228 ..\..\..\boost/regex/v4/basic_regex.hpp 346: Too many error or warni ng messages in function __stdcall regcompA(regex_tA *,const char *,int) *** 6 errors in Compile *** "bcc32.exe" -j5 -g255 -q -c -P -Ve -Vx -a8 -b- -v -Od -tWC -tWR -tWC -tWD -W M- -DBOOST_ALL_NO_LIB=1 -DBOOST_REGEX_DYN_LINK=1 -I"..\..\.." -I"C:\Program File s\Borland\CBuilder5/include/" -o"..\..\..\bin.v2\libs\regex\build\borland-5.5.1\ debug\posix_api.obj" "..\..\..\libs\regex\src\..\src\posix_api.cpp" Is there anybody who forced BCC 5.5/5.5.1 to play with Boost/Regex? Thanks, Marcin

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Problem building Boost 1.37.0 on AIX using XL C/C++ v9.0.0.7
by Scott P. Smith (Atlanta) 24 Nov '08

24 Nov '08

I have successfully built the bjam tool, however when I attempt to build boost I get the following errors: "libs/math/build/../src/tr1/cbrt.cpp", line 11.39: 1540-0403 (S) "cbrt(double)" is already defined. "libs/math/build/../src/tr1/copysign.cpp", line 13.39: 1540-0403 (S) "copysign(double, double)" is already defined. It looks like the TR1 implementation that comes with xlC v9 is clashing with the implementation in boost. Is there a way to tell the bjam that the compiler supports TR1? I did not see such an option in the bjam help output. Thanks, Scott ________________________________ This message may contain confidential information and is intended for specific recipients unless explicitly noted otherwise. If you have reason to believe you are not an intended recipient of this message, please delete it and notify the sender. This message may not represent the opinion of IntercontinentalExchange, Inc. (ICE), its subsidiaries or affiliates, and does not constitute a contract or guarantee. Unencrypted electronic mail is not secure and the recipient of this message is expected to provide safeguards from viruses and pursue alternate means of communication where privacy or a binding message is desired.

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Re: [Boost-users] boost test with assert()
by Hicham Mouline 24 Nov '08

24 Nov '08

Hmm. Sadly, RemoveSimulation() does other things that SimulationId knows nothing about ... > ----- Original Message ----- > From: "Gennadiy Rozental" <rogeeff(a)gmail.com> > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] boost test with assert() > Date: Fri, 21 Nov 2008 23:45:59 +0000 (UTC) > Hicham Mouline <hicham <at> mouline.org> writes: > > > Possibly, there is a nicer/cleaner way to test this? > > Possible there is a nicer way to design this? Why not just call > RemoveSimulation > from SimulationId destructor? > > Gennadiy

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[boost::asio]about boost::asio::async_read_until
by Ken zhang 24 Nov '08

24 Nov '08

Hi Dear all I want use async_read_until for read stream from socket until EOF,but I can't compile code below. code: boost::asio::async_read_until(socket_, stream_buffer_,boost::asio::transfer_all(), boost::bind(&http_connection::handle_read_response, this, boost::asio::placeholders::error,boost::asio::placeholders::bytes_transferred)); stream_buffer is instance of boost::asio::streambuf I got the error like: d:\development\boost_1_36_0\boost\asio\impl\read_until.ipp(953) : error C2664: "bool boost::asio::detail::transfer_all_t::operator ()<iterator>(const Error &,size_t)":Can't convert paramerater 2 from "iterator" to "size_t" with [ Error=iterator ] d:\development\tcphttpbridge\httpconnection.cpp(75):参见对正在编译的函数模板实例化"void boost::asio::async_read_until<boost::asio::ip::tcp::socket,std::allocator<_Ty>,boost::asio::detail::transfer_all_t,boost::_bi::bind_t<R,F,L>>(AsyncReadStream &,boost::asio::basic_streambuf<> &,MatchCondition,ReadHandler,void *)"的引用 with [ _Ty=char, R=void, F=boost::_mfi::mf2<void,http_connection,const boost::system::error_code &,size_t>, L=boost::_bi::list3<boost::_bi::value<http_connection *>,boost::arg<1>,boost::arg<2>>, AsyncReadStream=boost::asio::ip::tcp::socket, MatchCondition=boost::asio::detail::transfer_all_t, ReadHandler=boost::_bi::bind_t<void,boost::_mfi::mf2<void,http_connection,const boost::system::error_code &,size_t>,boost::_bi::list3<boost::_bi::value<http_connection *>,boost::arg<1>,boost::arg<2>>> ] -- Best Regards, Ken

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