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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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Compilation error for Boost.Function 1.34.x fix with TR1 headers.
by Robert Fairlie-Cuninghame 31 Jan '08

31 Jan '08

Hi all, I recently applied the Boost.Function critical bug fix (Dec 17) to my boost 1.34.1 library and I came up against a compilation error. However, I found that if I removed the boost/tr1/tr1 include path when building then the fixed library would compile correctly. Has anyone got the fix to work with the TR1 include paths? I haven't see any other reports of problems with it. I'm using gcc 3.3.5. The first compile error is a suspicious BOOST_FUNCTION_NUM_ARGS redefinition by the TR1 headers. The compile output was as follows: C++ build/CommandLineOptions.o In file included from release/boost-1_34_1/boost/preprocessor/iteration/detail/iter/forward1.hpp:47, from release/boost-1_34_1/boost/function.hpp:62, from release/boost-1_34_1/boost/tr1/functional.hpp:99, from release/boost-1_34_1/boost/tr1/tr1/functional:27, from release/boost-1_34_1/boost/function/function_base.hpp:18, from release/boost-1_34_1/boost/function/detail/prologue.hpp:16, from release/boost-1_34_1/boost/function/function_template.hpp:12, from release/boost-1_34_1/boost/function/detail/maybe_include.hpp:18, from release/boost-1_34_1/boost/function/function1.hpp:11, from release/boost-1_34_1/boost/program_options/value_semantic.hpp:13, from release/boost-1_34_1/boost/program_options/options_description.hpp:13, from release/boost-1_34_1/boost/program_options.hpp:13, from src/CommandLineOptions.cpp:26: release/boost-1_34_1/boost/function/detail/function_iterate.hpp:13:1: "BOOST_FUNCTION_NUM_ARGS" redefined ******** note first error here ******* In file included from release/boost-1_34_1/boost/program_options/value_semantic.hpp:13, from release/boost-1_34_1/boost/program_options/options_description.hpp:13, from release/boost-1_34_1/boost/program_options.hpp:13, from src/CommandLineOptions.cpp:26: release/boost-1_34_1/boost/function/function1.hpp:10:1: this is the location of the previous definition In file included from release/boost-1_34_1/boost/function/detail/maybe_include.hpp:13, from release/boost-1_34_1/boost/function/detail/function_iterate.hpp:14, from release/boost-1_34_1/boost/preprocessor/iteration/detail/iter/forward1.hpp:47, from release/boost-1_34_1/boost/function.hpp:62, from release/boost-1_34_1/boost/tr1/functional.hpp:99, from release/boost-1_34_1/boost/tr1/tr1/functional:27, from release/boost-1_34_1/boost/function/function_base.hpp:18, from release/boost-1_34_1/boost/function/detail/prologue.hpp:16, from release/boost-1_34_1/boost/function/function_template.hpp:12, from release/boost-1_34_1/boost/function/detail/maybe_include.hpp:18, from release/boost-1_34_1/boost/function/function1.hpp:11, from release/boost-1_34_1/boost/program_options/value_semantic.hpp:13, from release/boost-1_34_1/boost/program_options/options_description.hpp:13, from release/boost-1_34_1/boost/program_options.hpp:13, from src/lCommandLineOptions.cpp:26: release/boost-1_34_1/boost/function/function_template.hpp:98: error: variable declaration is not allowed here release/boost-1_34_1/boost/function/function_template.hpp:98: error: syntax error before `{' token .... and then a bunch more errors before it gives up. If anyone else has got this scenario to work then I'll know it must be something screwy in our setup. Cheers, Robert.

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releasing code under the BSL
by Manfred Doudar 31 Jan '08

31 Jan '08

Hello all, Hoping some one might offer some guidance... (somewhat off-topic, appologies). I've developed a generic DAG library in-house and seeking to place it under the BSL, and would even go as far as a Boost review if people here want such a thing (that's the intention after all). Now, I have obtained authorization from my organization's management and their legal representatives for the software release (yippee!). However, an email trail of approvals, while legal tells me is satisfactory, I would much rather a written approval on company a letter-head. IP Counsel of the organization I work for just said I ought to draft the letter myself and just have the Lab Director sign it (, consistent with the approval already granted .. ie. "Ok to release the work under the BSL"). My question is, what exactly ought to be the wording of such a letter? All help appreciated, and again apologies if it is too far removed from Boost.users NG business. If I ought to take this question elsewhere, please do let me know. Cheers, -- Manfred Doudar - Principal Research Engineer (Software) National ICT Australia - Canberra Research Lab | www.nicta.com.au Research School of Information Sciences and Engineering (RSISE) The Australian National University - Canberra, ACT 0200 AUSTRALIA

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[boost any] casting problems (BUG?)
by Ovanes Markarian 31 Jan '08

31 Jan '08

Hello *, I would like to ask the developers of boost::any if the ctor template in boost::any template<typename ValueType> any(const ValueType & value) : content(new holder<ValueType>(value)) { } is intentionally not marked as explicit. Today using boost::any_cast and with a std::map (mapping of some id to boost::any) iterator I was wondering why I got an exception when I found a correct any instance. My code looked like: map_type::const_iterator iter = map.find(Key); if(map.end()!=iter) return boost::any_cast<SomeResultType const&>(*iter); Unforturenately, I forgot that map iterator references a pair<KeyType, ValueType>. This cast caused the compiler to implicitly create a new const any type containing the dereferenced pair and throw an exception that my expected result type was wrong. I don't know which design rationale was intended when this ctor was not marked as explicit or if it is a bug. With Kind Regards, Ovanes BTW, I use boost 1.34.1 and vc 7.1.

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Re: [Boost-users] Boost Thread: condition.wait()
by Kesseli Pascal 31 Jan '08

31 Jan '08

Hey Ya Thanks for the quick reply. Well, it would be more complicated in the way that the only condition that would keep in the loop would be the number of threads already arrived on this condition (numberOfThreadsReady). As soon as all threads have arrived, this number is set back to zero, which would keep the threads waiting if they re-checked this condition. But I found out that Boost supports a much more suitable solution for this problem, namely the barrier class. And, concerning the use of a barrier, I trust I am not mistaken that there is no loop needed when calling barrier.wait(), or is there :) ? If so, that would call my complete understanding of the barrier mechanism into question :) . Thanks again & greeetz Pascal "Vladimir Prus" <ghost(a)cs.msu.su> schrieb im Newsbeitrag news:<fnp5p1$cce$1(a)ger.gmane.org>... > Kesseli Pascal wrote: > > > Hi everyone > > > > Recently I was trying to synchronize one of my functions using the > > following code: > > > > // write own data to shared vector... > > // ... > > if (++numberOfReadyThreads < numberOfInvolvedThreads) { > > allChargingDataReady.wait(lock); > > return; > > } > > numberOfReadyThreads = 0; // Only the last thread enters this section. > > // write data to file... > > allChargingDataReady.singal_all(); > > > > The idea is that all threads submit their data using this function and > > then wait before reading in the next set of data until all threads have > > submitted their data. The last thread to submit his data is the one who > > has to write the collected data to a file. > > > > Using this structure, I find it very simple to realize this behavior. > > However, I know from programming with Java that the VM there sometimes > > awakens one's threads without any reason, which means that I would have to > > realize my condition like this instead: > > > > > > // ... > > while(numberOfReadyThreads < numberOfInvolvedThreads) { > > allChargingDataReady.wait(lock); > > } > > // ... > > > > Implementing the same behavior using this snippet is much more complicated > > though and I would rather avoid it if possible. > > Why is it more complicated? > > > And that leads us right > > away to my question: > > > > Is the while()-workaround using Boost & C++ needed as well as in Java? Or > > can I use the much simpler if()-version? > > As docs say, you need to test your condition in a loop in Boost.Threads. > This is not a particular property of Java or Boost.Threads -- that's how > POSIX threads work. (Windows don't have native condition, and I have much > clue how conditions are simulated on windows and whether window Event thing > has similar behaviour). > > - Volodya No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.19.16/1251 - Release Date: 30.01.2008 09:29

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