January 2010 - Boost-users - lists.preview.boost.org

[iterators][range][rangeex] range concatenation
by Dmitry Vinogradov 12 Jan '10

12 Jan '10

Is it possible with Boost (or RangeEx) to concatenate ranges? Sample usage: template <class Range> void process_range(Range const &); std::vector<foo> v = ...; std::list<foo> l = ...; process_range(concat(v, l));

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[asio] Why are the strands in the "HTTP Server 3" example necessary?
by Tacheon 12 Jan '10

12 Jan '10

In the HTTP Server 3 (http://tinyurl.com/yh95d2b) example of the asio documentation strands are used to synchronize the invocation of completion handlers? But why are they necessary here? As far as I get it, the handlers are invoked in strict sequential order for each distinct connection (http://tinyurl.com/ybohynd). Each connection has its own set of resources so synchronization shouldn't be necessary, should it? Thanks in advance, Boris

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gil and OpenGL
by mailinglist＠squarepx.com 12 Jan '10

12 Jan '10

This is my first post in any mailinglist ever so i hope i am doing this right. I successfully integrated the boost::gil module into my code to load some images and process their content so that I can display it as a texture in OpenGL. My problem right now is the massive performance issue in retrieving the color information from the loaded image. I am looping through every row and column and retrieve the red, green, blue and alpha color with the get_color method and push those values to a char array. So I was wondering what the best approach would be to get the color information from the gil image into OpenGL or at least a char array. Thanks in advance.

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[program_options] linking error with example
by katharina 12 Jan '10

12 Jan '10

Hi, I have problems starting out with the program_options library. Looking at the tutorial, I wanted to try out the first example metioned, first.cpp (which is located in boost_1_41_0/libs/program_options/example). But there seems to be some linking error. I try to compile it by g++ -I ~boost_1_41_0 first.cpp -o first ~/boost_1_41_0/stage/lib/libboost_program_options.a But then I get a strange error: /tmp/ccDB6KSC.o: In function `boost::program_options::basic_command_line_parser<char>::extra_parser(boost::function1<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::allocator<boost::function_base> >)': first.cpp:(.text._ZN5boost15program_options25basic_command_line_parserIcE12extra_parserENS_9function1ISt4pairISsSsERKSsSaINS_13function_baseEEEE[boost::program_options::basic_command_line_parser<char>::extra_parser(boost::function1<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::allocator<boost::function_base> >)]+0x27): undefined reference to `boost::program_options::detail::cmdline::set_additional_parser(boost::function1<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::allocator<boost::function_base> >)' collect2: ld returned 1 exit status What am I doing wrong? Thanks, Katharina

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[Bjam] Ignore specific library
by Simon Pickles 12 Jan '10

12 Jan '10

Hi, Using Visual Studio, it is possible to 'Ignore Specific Library' (Project Properties>Configuration Properties>Linker>Input>Ignore Specific Library). We have found this a useful feature in a project. Now we want to build the project using bjam, but we need to reproduce that linker behaviour. Is there any ignore <library> feature? Many thanks Simon

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how to make Pool allocate one chunk buffer one time?
by zhangxiaowei 12 Jan '10

12 Jan '10

Hi, all I am doing one video processing software, which uses Boost::pool as the buffer manager. but every time pool allocates buffers, it malloc all needed memory at one time. for example, I create one pool object for 1024 B for one chunk, and 16 chunks at first. Pool malloc all the 1024 * 16 (16KB) at one time. this leads to memory allocation error for my application, because I need 8294400B (1920 * 1080 * 4, for one video frame) * 32, that is more than 256 MB. I use default new/delete, so new returns NULL for the third time in my case. but from memory monitor, there are still enough memory free. after tracing into new, I found this is from the Microsoft memory management design and memory fragments. is there any way to set Pool to allocate one chunk by another? for example, when I want one chunk, it allocates 8294400B. and for another time, it does another. so this should solve my issues for the memory usage. after checking the code of Pool, it is all based on contiguous memory. if pool cannot meet my requirement, is there any other option in BOOST? BTW, I am working on Windows 32 bits with MS Visual Studio 2005. Thank you for any comment. Xiaowei _________________________________________________________________ 上Windows Live 中国首页，下载Messenger2009安全版！ http://www.windowslive.cn

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Re: [Boost-users] Boost release 1.41.0 available
by Tom Kent 11 Jan '10

11 Jan '10

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I've built windows libraries (vc7.1, vc8, vc9) for this version, if you want them, you can get them from my website: http://boost.teeks99.com Usually I'm quicker about this, but I didn't notice that the last release happened until I saw that the next one was coming up :-) Tom > From: Beman Dawes <bdawes <at> acm.org> > Subject: Boost release 1.40.0 is available > Newsgroups: gmane.comp.lib.boost.user > Date: 2009-11-18 13:25:48 > Boost release 1.41.0 is now available. > > This release contains one new library and numerous bug fixes for > existing > libraries. For details, including download links, see > http://www.boost.org/users/news/version_1_41_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/1_41_0/more/getting_started/index.html > > Thanks, > > --The Boost release team -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAktLi4wACgkQccZrtZUgfJClsgCeJAfaSk5gVsxi4w9L/cc/EYb5 FqwAn1YA74pBMFUmkhvsHlb8gpMlaP0G =0T+M -----END PGP SIGNATURE-----

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utf8_codecvt_facet
by Patrick Horgan 11 Jan '10

11 Jan '10

utf8_codecvt is in libserialization and in libprogram_options--I thought it was moving to utility? Is there one supported spot? Is there any documentation that talks about what to include and link? The .hpp file is still in boost/detail, boost/archive/detail, boost/program_options,boost_filesystem/src, and libs/iostreams/test/detail. Guess it's not cleaned up yet? Or maybe people didn't want cross dependencies? Anyway I need to either use it or write one;) I'm not doing serialization or program_options (yet, who knows, just starting the project). I also need to be able to be able to deal with UTF-16, I don't suppose there's a codecvt facet for that, huh? Patrick

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Spirit parser includes
by Eloi Du Bois 11 Jan '10

11 Jan '10

Hi, I would like to know which include do I need to use grammar. When using include "boost/spirit.hpp", it says me that it is deprecated... d:\travail\tuttleofx\plugins\lut\src\lutengine\lut_reader.h(37) : error C2039: 'grammar' : n'est pas membre de 'boost::spirit' d:\travail\tuttleofx\plugins\lut\src\lutengine\lut_reader.h(37) : error C2504: 'grammar' : classe de base non définie d:\travail\tuttleofx\plugins\lut\src\lutengine\lut_reader.h(37) : error C2143: erreur de syntaxe : absence de ',' avant '<' d:\travail\tuttleofx\plugins\lut\src\lutengine\lut_reader.h(55) : error C2143: erreur de syntaxe : absence de ';' avant '<'

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Using 'address-model-32_64' on Mac OS 10.6
by Dane Springmeyer 11 Jan '10

11 Jan '10

I've recently upgraded to a Mac with 64bit firmware and Snow Leopard. I've noticed all applications compiled with g++ now default to 64 bit libs (x86_64), including boost. Thanks by the way for the fixes to boost 1.41 that allow successful 3- way arch compilation on osx again! Now I'm trying to just build two- way arches. I'm now trying to compile boost (I happen to be using trunk), and am noticing that passing 'address-model-32_64' does not seem to have the effect I'd expect. If the flag is passed the only affect I notice is that the build directories include it 'address-model-32_64' in the path, but notably the '-arch -i386 -arch x86_64' flags are not properly added to the CXXFLAGS and LINKFLAGS. Therefore the compiled dynamic libraries are still single architecture, x86_64. Passing 'architecture=combined' does prompt these flags, but includes the 'arch ppc' flag as well which I don't want. So, is it a bug that using address-model alone does not work or am I am misunderstanding something? Thanks for any clarification. Cheers, Dane

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