February 2008 - Boost-users

Question about Boost Interfaces
by Martin de Lasa 01 Feb '08

01 Feb '08

Hi, Does anyone know the status of the Boost.Interfaces Library proposed by Chris Diggins in 2004? I have found a few references to it on the internet, including one on the Boost Wiki, but it seems to not have ever made it into the official Boost library. I am interest in exploring how Aspect-Oriented Programming techniques might be incorporate into an existing code-base, and would prefer to use a library based solution, rather than a special preprocessor (eg. apsectc++). Since Boost has come to the rescue in the past (with elegant solutions), in this respect, I thought I would start here. If boost.interfaces is dead, does anyone have any suggestions for C++ library-based AOP solutions that have worked for them. Thanks in advance. Martin

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Boost MPI
by Renato Golin 01 Feb '08

01 Feb '08

Hiya, I've heard that MPI was accepted and reviewed, but I can't find it in my regular Boost distribution (ubuntu) nor in the web site. If this is the specification, I'm SO looking forward to use it. http://www.osl.iu.edu/~dgregor/boost.mpi/doc/ Do you have any ideas when / if this is going to be finally approved and distributed with Boost? cheers, --renato -- Reclaim your digital rights, eliminate DRM, learn more at http://www.defectivebydesign.org/what_is_drm

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Boost 1.34.1 build fails on openSUSE 10.3
by Christoph Duelli 01 Feb '08

01 Feb '08

Trying to build Boost 1.34.1 on OpenSuse 10.3 fails for me: soft@mxt2:/tmp/boost_1_34_1> ./configure Building Boost.Jam with toolset gcc... tools/jam/src/bin.linuxx86/bjam Detecting Python version... 2.5 Detecting Python root... /usr Unicode/ICU support for Boost.Regex?... not found. Generating Boost.Build configuration in user-config.jam... Generating Makefile... soft@mxt2:/tmp/boost_1_34_1> make ./tools/jam/src/bin.linuxx86/bjam --user-config=user-config.jam /bin/sh: line 1: 15631 Segmentation fault ./tools/jam/src/bin.linuxx86/bjam --user-config=user-config.jam Not all Boost libraries built properly. soft@mxt2:/tmp/boost_1_34_1> cat /etc/*release LSB_VERSION="core-2.0-noarch:core-3.0-noarch:core-2.0-ia32:core-3.0-ia32" openSUSE 10.3 (i586) VERSION = 10.3 I have built Boost (both this and older versions) on other machines before, so I assume the "./configure; make" should work (although I usually do specify a --prefix). Does anyone know (the cause of) this error? Thank you in advance and best regards Christoph

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BGL: return all available paths between two vertices
by Ioannis Nousias 01 Feb '08

01 Feb '08

Hello everyone. This is a Boost Graph library question. Is there an algorithm in the library that can return all available paths between two vertices? If not, which algorithm from the library is best to use as a bases, to define a custom visitor for it? (assuming that is the preferred approach) regards, Ioannis

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Cannot build boost libraries...
by BERTRAND Joël 01 Feb '08

01 Feb '08

Hello, I have to build boost-library on a sparc64 server (32 bits userland). This, I have downloaded boost_1_34_1.tar.bz2 and followed build instructions I have found. I only obtain an error that I don't understand : Root fermat:[/opt/src/boost_1_34_1] > ./configure --prefix=/opt Building Boost.Jam with toolset gcc... tools/jam/src/bin.linuxsparc/bjam Detecting Python version... 2.4 Detecting Python root... /usr Unicode/ICU support for Boost.Regex?... not found. Backing up existing Boost.Build configuration in user-config.jam.4 Generating Boost.Build configuration in user-config.jam... Generating Makefile... Root fermat:[/opt/src/boost_1_34_1] > ls boost index.htm people user-config.jam boost-build.jam Jamfile.v2 project-root.jam user-config.jam.1 boost.css Jamrules README user-config.jam.2 boost.png libs regression user-config.jam.3 configure LICENSE_1_0.txt rst.css user-config.jam.4 doc Makefile status wiki google_logo_40wht.png more tools Root fermat:[/opt/src/boost_1_34_1] > make ./tools/jam/src/bin.linuxsparc/bjam --user-config=user-config.jam Unable to load Boost.Build: could not find "boost-build.jam" --------------------------------------------------------------- Attempted search from /opt/src/boost_1_34_1 up to the root and in these directories from BOOST_BUILD_PATH and BOOST_ROOT: /usr/share/boost-build. Please consult the documentation at 'http://www.boost.org'. Not all Boost libraries built properly. Root fermat:[/opt/src/boost_1_34_1] > I don't understand why bjam does not find boost-build.jam. This file is in boost top directory. I have tried to set BOOST_BUILD_PATH and BOOST_ROOT without any other success. What is my mistake ? Regards, JKB

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How to expose self defined type in boost.python
by Huang You Gong 01 Feb '08

01 Feb '08

Hi, I try to use boost.python to invoke C++ library in Python, so I need to expose types and classes. Here is the c++ head file: *typedef int XTYPE;* *class XCLASS* *{* *public:* * XTYPE getvalue( void ){ return XTYPE( 3 ); }* *};* So I write exposing code in BOOST_PYTHON_MODULE like this: *BOOST_PYTHON_MODULE( x )* *{* * class_< XCLASS >( "XCLASS" )* * .def( "getvalue", &XCLASS::getvalue, return_value_policy< copy_non_const_reference >() )* * ;* *}* but there is compiling error as using of undefined type. what shall I do to make the type XTYPE known by boost.python? Thanks in advance! -- Huang You Gong

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boost python: linking with pythonxx_d.lib
by Christian Hoffmann 01 Feb '08

01 Feb '08

Hi, I tried to compile boost python so that it links against the debug version. I therefore run bjam toolset=msvc-9.0 threading=multi python-debugging=on link=shared variant=debug libs\python\build Running it with -n shows, that it sets -DBOOST_DEBUG_PYTHON, but it still links with python25.lib. It only picks "right" python25_d.lib, if I add something to my user-config.jam, like the following: using python : 2.5 : C:\\src\\Python-2.5\\PCBuild\\python ; using python : 2.5 : C:\\src\\Python-2.5\\PCBuild\\python_d : # includes : # libs : <python-debugging>on ; What is the difference between the two methods (as a bjam argument and in the user-config.jam), and is there a way to combine both on the command line? Thanks and regards, Chris

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replacement of CAtlREMatchContext
by Prashant Gupta 01 Feb '08

01 Feb '08

> > I am trying to port the following VC8 code to boost. I need to know what > are the equivalent methods in boost:: namespace for the following: > 1) m_nNumGroups data memeber of class CAtlREMatchContext > 2) GetMatch( ) method of class CAtlREMatchContext > > I have gone through the boost documentation but could not suceed. > > for (UInt32 ulGroupIndex = 0; ulGroupIndex < > atlMatchContext.m_uNumGroups; ++ulGroupIndex) > { > const CAtlREMatchContext<>::RECHAR* pszStart = 0; > const CAtlREMatchContext<>::RECHAR* pszEnd = 0; > atlMatchContext.GetMatch(ulGroupIndex, &pszStart, > &pszEnd); > int nLength = static_cast<int>(pszEnd - pszStart); > strTemp = pszStart; > strTemp = strTemp.substr(nLength); > AcMs::trimString(strTemp, true, true); > switch(ulGroupIndex) > { > case MsV7ImgMgrImgIndexType::kViewNo: >

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Relationship of Lambda and Phoenix
by Scott Meyers 01 Feb '08

01 Feb '08

At BoostCon 2007, I was told that the functionality of Boost.Lambda was essentially present via Phoenix in Boost.Spirit. From what I can tell, both Lambda and Spirit/Phoenix will be present in 1.35, leading me to wonder what advice to give people who are interested in experimenting with the use of lambda functions in Boost. Are people to be encouraged to use Phoenix over Lambda, or are there features in Lambda that Phoenix doesn't have? I'll be giving an overview of some Boost libraries at the Software Development conference in March, and I'll be showing some examples of Lambda. If I should be telling people to use Phoenix for future work, I'd like to know that. Thanks, Scott

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