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

[ptr_container] Pair type for boost::ptr_map?
by Robert Dailey 19 Apr '08

19 Apr '08

Hi, I have the following code: void HandlePair( std::pair<int, char*>& mypair ) { } void main() { boost::ptr_map<int, char> mymap; HandlePair( *mymap.begin() ); } What's the proper way to accept pairs in the HandlePair function? I can't seem to find a boost::ptr_pair anywhere, or something like that.

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[program_options] debug assertion with options_description
by Nicholas Clark 19 Apr '08

19 Apr '08

I just received a huge application that uses boost for just about everything. I am receiving a debug assertion when trying to add program descriptions. To help isolate the error I have built a very simple example and am still getting the crash. For reference I am using boost 1.32. When I moved to any of the newer versions of boost this specific error goes away but I rack up a list of compiler errors a mile long. I am trying to fix this issue without moving to a newer version of boost because this is a legacy application and we have a minimum amount of time/budget. The last compiled version delivered by the old contractor does not have this error. This previous version was built with VS71 but we are using VS80 (with SP2) . could this be the difference? #include <boost/program_options.hpp> namespace po = boost::program_options; using namespace std; using namespace boost::program_options; int _tmain(int argc, _TCHAR* argv[]) { po::options_description desc("Allowed options"); desc.add_options() ("help,H", "produce help message") ; return 0; } Again a debug assert is triggered when calling 'add_options' with boost 1.32 but not in newer version using VS80 with SP2. Thanks! Nick --------------------------------------------------- Nicholas Clark (Nick) Sr. Computer Scientist ReallaeR, LLC ( <http://www.reallaer.com/> www.ReallaeR.com) (800) 816-1913 ext.316 <mailto:clark@reallaer.com> clark(a)reallaer.com

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general question on testing
by Ovanes Markarian 18 Apr '08

18 Apr '08

Hello *, I have a question regarding testing. I would like to test my implementation how it bahaves in multi-threaded environment within different compilation units. Does anyone have ideas how I can generate from my c++ project (no perl or other scripting tools) (possibly with preprocessor ??) multiple compilation units in an automated way. Many thanks, Ovanes

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spirit's functor_parser<functor>
by Olaf Peter 18 Apr '08

18 Apr '08

Hi, I'm using a lot of functor parsers and combine them in one grammar. Now, my grammar explodes at the time. Therefore I want to split/compile the functor parsers into separate files. This requires a forward declaration. Well, how to perform this?? spirit::functor_parser<functor> functor_p; is an instance. Thanks, Olaf

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[regex] 1.35 missing lib on Windows?
by Larry 18 Apr '08

18 Apr '08

I built 1.35 on Windows XP using MS Visual Studio .NET 2003 using bjam --toolset=msvc-7.1 install No errors in the build. Including <boost/regex.hpp> in a cpp file compiles OK using IDE but the link fails missing libboost_regex-vc71-mt-gd-1_35.lib and the lib is not present in the "install" lib directory. The project is being built with compiler option /MDd. Is this a Boost build failure or should I have specified something else to get the lib created or to use a different lib? Anyone know? Larry

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I can't build the boost with vc++6.0
by 김홍재 18 Apr '08

18 Apr '08

I built the bjam and then use following command to compile the boost 1.35.0. D:\boost_1_35_0>bjam -q --toolset=msvc But I had a error message, " .\boost/mpl/protect.hpp(27) : fatal error C1001: INTERNAL COMPILER ERROR". How can I resolve this? Plz, help me. Environment: Windows XP sp2 korean VC++6.0 Full message: D:\boost_1_35_0>bjam -q --toolset=msvc warning: Graph library does not contain optional GraphML reader. note: to enable GraphML support, set EXPAT_INCLUDE and EXPAT_LIBPATH to the note: directories containing the Expat headers and libraries, respectively. warning: skipping optional Message Passing Interface (MPI) library. note: to enable MPI support, add "using mpi ;" to user-config.jam. note: to suppress this message, pass "--without-mpi" to bjam. note: otherwise, you can safely ignore this message. Building Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (don't panic: this is a strictly optional feature). ...patience... ...patience... ...found 3933 targets... ...updating 262 targets... MkDir1 bin.v2 MkDir1 bin.v2\libs MkDir1 bin.v2\libs\serialization MkDir1 bin.v2\libs\serialization\build MkDir1 bin.v2\libs\serialization\build\msvc-6.0 MkDir1 bin.v2\libs\serialization\build\msvc-6.0\release MkDir1 bin.v2\libs\serialization\build\msvc-6.0\release\threading-multi compile-c-c++ bin.v2\libs\serialization\build\msvc-6.0\release\threading- multi\basic_archive.obj basic_archive.cpp ........ ........ .\boost/mpl/protect.hpp(27) : fatal error C1001: INTERNAL COMPILER ERROR (compiler file 'msc1.cpp', line 1794) Please choose the Technical Support command on the Visual C++ Help menu, or open the Technical Support help file for more information call "C:\Program Files\Microsoft Visual Studio\VC98\Bin\VCVARS32.BAT" >nul cl /Zm800 -nologo @"bin.v2\libs\serialization\build\msvc- 6.0\release\threading-m ulti\binary_iarchive.obj.rsp" ...failed compile-c-c++ bin.v2\libs\serialization\build\msvc- 6.0\release\threadi ng-multi\binary_iarchive.obj... ...failed updating 1 target... ...updated 18 targets...

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[Python] Debug Python (PY_DEBUG) libs and auto-linking
by Brian O'Kennedy 18 Apr '08

18 Apr '08

Hi, Apologies for the long email, but I figured I might as well be detailed in my explanation. My two questions are below regarding the process of building Boost.Python against a PY_DEBUG debug build of Python, and the failure of auto-linking of such debug libs of Boost.Python (those with 'gyd' in the name). I'm using both the Release and Debug versions of Python 2.5.1 on Windows compiled with Visual Studio 2005. The Debug version of python produces python_d.exe and python25_d.dll, while the release version uses python.exe and python25.dll. I've downloaded and built Boost 1.35.0 with the following steps: 1. Edit Jamroot as follows: (lines I add start with a "+" ) <define>BOOST_ALL_NO_LIB=1 + <define>_SECURE_SCL=0 # Used to encode variant in target name. See the I do this since our codebase is compiled without the secure iterators for performance reasons. This isn't relevant to my question, but I might as well mention it. Also, I add the following to build the debug python libs: # location of python local python-root = [ MATCH "^--with-python-root=(.*)" : [ modules.peek : ARGV ] ] ; PYTHON_ROOT ?= $(python-root) ; + using python : 2.5 : C:\\3rdparty\\Python\\Python-2.5.1-vc8sp1-Patch1\\PCbuild\\python.exe + : C:\\\3rdparty\\Python\\Python-2.5.1-vc8sp1-Patch1\\Include C:\\3rdparty\\Python\\Python-2.5.1-vc8sp1-Patch1\\PC + : C:\\\3rdparty\\Python\\Python-2.5.1-vc8sp1-Patch1\\PCbuild + : <python-debugging>off ; + using python : 2.5 : C:\\3rdparty\\Python\\Python-2.5.1-vc8sp1-Patch1\\PCbuild\\python_d.exe + : C:\\3rdparty\\Python\\Python-2.5.1-vc8sp1-Patch1\\Include C:\\3rdparty\\Python\\Python-2.5.1-vc8sp1-Patch1\\PC + : C:\\3rdparty\\Python\\Python-2.5.1-vc8sp1-Patch1\\PCbuild + : <python-debugging>on ; # Select the libraries to install. libraries = [ libraries-to-install $(all-libraries) ] ; I could also add this to my user-config.jam file but I got annoyed by bjam not picking that up if it is in the same folder as Jamroot, it would only find it if I put it in my user home. Then I trigger the builds using bjam: bjam.exe -d +2 --toolset=msvc --build-type=complete install bjam.exe -d +2 --toolset=msvc --with-python python-debugging=on install debug bjam.exe -d +2 --toolset=msvc --with-python python-debugging=off install release This gives me the complete Boost I want with the addition of the Release and Debug versions of Boost Python. The Debug version of Boost Python I'm after is boost_python-vc80-mt-gyd-1_35.dll and the release is boost_python-vc80-mt-1_35.dll So, my first question is: Surely there must be an easier way to do what I tried to achieve above? Should building a true debug (ie, a traditional python debug lib with PY_DEBUG enabled) version of Boost Python really take this much hackery? This is where people point out to me just how little I know about bjam / boost build... Second problem is the auto linking of.Boost Python. If I create an DLL application in Visual Studio 2005, set the include directories, set the library directories, set the output target as BoostPythonTest.pyd in Release, and BoostPythonTest_d.pyd in Debug, I get the following situation. BoostPythonTest.cpp #include <boost/python.hpp> char const* greet() { return "hello, world"; } BOOST_PYTHON_MODULE(BoostPythonTest) { using namespace boost::python; def("greet", greet); } This auto-links boost_python-vc80-mt-1_35.dll in Release mode just as it should and everything works just fine. In Debug mode, this auto links boost_python-vc80-gd-1_35.dll which is the Boost.Python debug lib which does not define PY_DEBUG which is not the behaviour I want. The Boost Python docs makes some reference to using BOOST_DEBUG_PYTHON to change the behavior of wrap_python.hpp but no such support seems to exist to modify the auto-linking behavior. To get my module to link to release python in release mode, and debug python via boost_python-vc80-mt-gyd-1_35.lib (with PY_DEBUG, ie python25_d.dll) in debug mode, I need to do the following: BoostPythonTest.cpp #define BOOST_PYTHON_NO_LIB #ifdef _DEBUG #define BOOST_DEBUG_PYTHON #pragma comment(lib, "boost_python-vc80-mt-gyd-1_35.lib" ) #else #pragma comment(lib, "boost_python-vc80-mt-1_35.lib" ) #endif #include <boost/python.hpp> char const* greet() { return "hello, world"; } BOOST_PYTHON_MODULE(BoostPythonTest) { using namespace boost::python; def("greet", greet); } I've had a look through the auto-linking code in boost and no special case seems to exist for the debug Python libraries. Once again, my question is whether this really is what I need to do to get Boost Python to play nicely with PY_DEBUG debug mode Python? Thanks for any advice, or general abuse for my misunderstanding on how to configure boost build properly. Brian Ps: If you do not do this and link to boost_python-vc80-gd-1_35.lib instead you get this warning when you try to import your lib into a debug python interpreter: >>> import BoostPythonTest Fatal Python error: Interpreter not initialized (version mismatch?) ________________________________________________________________________ This e-mail, and any attachment, is confidential. If you have received it in error, do not use or disclose the information in any way, notify me immediately, and please delete it from your system. ________________________________________________________________________

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[filesystem] problems cross-compiling for QNX from windows host
by Guenther Stattenberger 18 Apr '08

18 Apr '08

Hi, I have some strange errors when cross-compiling some of the boost libraries for QNX on a windows host: According to the Jamfile, the filesystem library includes boost system in the linking stage NOT as a library (via e.g. -lboost_system-mt-d) but as a (shared) object. This has the effect, that somehow the current path of the libboost_system-mt-d.so file (e.g. bin.v2\libs\system\build\qcc\ debug\target-os-qnx\threadapi-pthread\threading-multi) is inserted into the filesystem library. Naturally, after moving the libraries to the QNX target this path isn't valid any longer. The runtime the complains "Could not find library ...". If I rename libboost_system-mt-d.so to have the path mentioned above prepended (not as a path, but really the filename, containing the backslashes) everything works fine. As a first workaround I decided to remove boost_system from the linking of boost_filesystem in the Jamfile and specify -lboost_system-mt-d in the link of my executable. This works fine, but unfortunately only up to the first exception. The program now gets aborted during unwind of the exception. The question now is: could somebody please indicate, why the boost_system library is not linked via the -l switch, and what is wrong trying to do this. Another solution might be to convince the linker not to include the compile-time path of the .so file but I was not successful trying this. Any help would be greatly appreciated. Thanks, Guenther

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[lambda] Lambda for member access
by Robert Dailey 18 Apr '08

18 Apr '08

Hi, In the Boost.Lambda documentation, it has a section for operators that cannot be overloaded, but I'm not really sure if this means you cannot use these operators with lambda expressions. I have the following map: class SomeClass { public: void Foo() {} }; std::map<int, SomeClass> mymap; I want to be able to do std::for_each() on this map and use lambdas to call the Foo() member on each element in the map. For example: std::for_each( mymap.begin(), mymap.end(), _1.second.Foo() ); Obviously the above does not compile. Is there a way to make this work without doing some crazy template specialization? Thanks.

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[Boost.Iostreams] Building iostreams with zlib support
by Andreas Profous 17 Apr '08

17 Apr '08

Hi, I'm trying to compile the following example code on Windows XP using MS Visual Studio 2005: -- from http://www.boost.org/libs/iostreams/doc/classes/zlib.html#installation ////////////////////////////// #include <fstream> #include <iostream> #include <boost/iostreams/filtering_streambuf.hpp> #include <boost/iostreams/copy.hpp> #include <boost/iostreams/filter/zlib.hpp> int main() { using namespace std; using namespace boost::iostreams; // added this line ifstream file("hello.z", ios_base::in | ios_base::binary); filtering_streambuf<input> in; in.push(zlib_decompressor()); in.push(file); boost::iostreams::copy(in, cout); } //////////////////////////////// So I downloaded the zlib library into the directory C:\Libs\zlib123 plus a prebuilt windows binary into the directory C:\Libs\zlib123\dll32 After reading http://www.boost.org/libs/iostreams/doc/installation.html I tried to add zlib.cpp to my test project, and to add the line #define BOOST_IOSTREAMS_NO_LIB to my source file. I got a bunch of linker errors, e.g. 1>zlib.obj : error LNK2019: unresolved external symbol _crc32 referenced in function "protected: void __thiscall boost::iostreams::detail::zlib_base::after(char const * &,char * &,bool)" (?after@zlib_base@detail@iostreams@boost@@IAEXAAPBDAAPAD_N@Z) 1>C:\Dev\Test\Test\Debug\Test.exe : fatal error LNK1120: 9 unresolved externals. If I delete ' #define BOOST_IOSTREAMS_NO_LIB' I get the following error: 1>LINK : fatal error LNK1104: cannot open file 'libboost_zlib-vc80-mt-gd-1_34_1.lib' Which is a file that doesn't exist. As I understand it I have to rebuild boost.iostreams with zlib support: C:\boost\boost_1_34_1\libs\iostreams\build>bjam "-sNO_COMPRESSION=0" "-sNO_ZLIB=0" "-sZLIB_SOURCE=C:\Libs\zlib123" "-sZLIB_LIBPATH=C:\Libs\zlib123\dll32" "-sZLIB_BINARY=zlibwapi.dll" I tried this and that but to be honest I don't really know what I'm doing and it didn't work. I would like to compile a static library and link my program against it, so that the example code works. It would also be ok to link it against a .dll - I don't really care, I just want to SOMEHOW use it! :) Can somebody give me detailed instructions on how to do that? Andreas

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