February 2008 - Boost-users - lists.preview.boost.org

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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