April 2011 - Boost-users - lists.preview.boost.org

Recommended mock framework to use with Boost?
by doug livesey 15 Mar '12

15 Mar '12

Hi -- I'm trying to learn to develop properly with C++ and Boost, and to that end am learning along with Boost.Test, as I'm a BDD coder in another language (Ruby) in my day job. I'm at the point, now, where my tests could really benefit from a mocking framework. There doesn't appear to be one in Boost (not documented, at least), so I wondered if anyone on the list could recommend a mocking framework that they use that works well with Boost.Test? Any and all advice gratefully received, Doug.

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[build] cannot specify different version of gcc
by Brodie Thiesfield 25 Aug '11

25 Aug '11

Hi, I'm trying to build boost on CentOS 5.5 using the /usr/bin/gcc44 compiler and I'm running into difficulties with documentation not fitting reality. How do I make this work? What I've tried... Note: I've removed /usr/bin/gcc and /usr/bin/g++ to force errors when gcc44 and g++44 are not used. Using ./bootstrap.sh Building Boost.Jam with toolset ... tools/jam/src/### ### No toolset specified. Please use --toolset option. Setting CC=/usr/bin/gcc44 and CXX=/usr/bin/g++44 (note that this won't work if gcc and g++ exist because then it will default to the gcc toolkit and not the gcc-4.4 toolkit that I want). This builds a number of things (looking at the bootstrap.log) but still gives the following error. Ignoring the error and calling ./bjam then fails. Building Boost.Jam with toolset ... tools/jam/src/### ### No toolset specified. Please use --toolset option. Using ./bootstrap.sh --toolset=gcc gives an error: unrecognized option: --toolset=gcc Using ./bootstrap.sh --with-toolset=gcc gives an error: Building Boost.Jam with toolset gcc... Failed to build Boost.Jam -> bootstrap.log shows that it is trying to build with gcc, which doesn't exist, therefore error. Using ./bootstrap.sh --with-toolset=gcc-4.4 gives an error: Building Boost.Jam with toolset gcc... Failed to build Boost.Jam -> bootstrap.log shows ### Unknown toolset: gcc-4.4 Creating ~/user-config.jam as: import toolset.using ; using gcc : 4.4 : g++44 ; export BOOST_USER_CONFIG=~/user-config.jam Then calling the same ./bootstrap.sh command lines above show no difference. How in the world do I get this thing to use /usr/bin/gcc44 and /usr/bin/g++44 to compile? I think that I'm going to have to create local links ./gcc -> /usr/bin/gcc44 and add the current directory to the path just to get this to build the way that I want it to. This seems crazy. Regards, Brodie

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MSVC Visualizers Update
by Filip Konvička 28 Jul '11

28 Jul '11

Hi all, I've just updated the Boost visualizers wiki page at https://svn.boost.org/trac/boost/wiki/DebuggerVisualizers I updated the visualizer for Boost.MultiIndex, which did not work since Boost 1.35. I also added new visualizers for Boost.DateTime (ptime and time_duration) and a simple boost::shared_ptr visualizer. The visualizers are available for checkout via SVN at https://svn.boost.org/svn/boost/sandbox/boost_docs/subprojects/DebuggerVisu… Cheers, Filip

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[multi-array] Extracting dimension information from a multi-array
by Ryan McConnehey 15 Jul '11

15 Jul '11

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[Python] Undefined symbol in extension library with python 3
by Vivek 17 Jun '11

17 Jun '11

I compiled and installed boost 1.46.1 from source recently using: $ ./bootstrap.sh --with-python-version=3.1 $ sudo ./bjam -j4 install I then created the following trivial python extension: #include <boost/python.hpp> struct mystruct { int i; }; BOOST_PYTHON_MODULE(test) { using namespace boost::python; class_<mystruct>("Mystruct") .def_readwrite("i", &mystruct::i) ; } and compiled and ran it, but got an undefined symbol error: $ g++ -shared question.cpp -I/usr/include/python3.1 -lboost_python3 -otest.so $ python3 Python 3.1.2 (release31-maint, Sep 17 2010, 20:34:23) [GCC 4.4.5] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import test Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: ./test.so: undefined symbol: _ZN5boost6python6detail11init_moduleEPKcPFvvE ldd confirms the missing symbol: $ ldd -r test.so linux-gate.so.1 => (0x00221000) libboost_python3.so.1.46.1 => /usr/local/lib/libboost_python3.so.1.46.1 (0x00a3d000) libstdc++.so.6 => /usr/lib/libstdc++.so.6 (0x0022b000) libm.so.6 => /lib/libm.so.6 (0x00960000) libc.so.6 => /lib/libc.so.6 (0x00316000) libutil.so.1 => /lib/libutil.so.1 (0x004b8000) libpthread.so.0 => /lib/libpthread.so.0 (0x00cf2000) libdl.so.2 => /lib/libdl.so.2 (0x00be4000) librt.so.1 => /lib/librt.so.1 (0x005d3000) libgcc_s.so.1 => /lib/libgcc_s.so.1 (0x00489000) /lib/ld-linux.so.2 (0x00fd5000) undefined symbol: PyExc_ImportError (/usr/local/lib/libboost_python3.so.1.46.1) undefined symbol: PyProperty_Type (/usr/local/lib/libboost_python3.so.1.46.1) ... snip ... *undefined symbol: _ZN5boost6python6detail11init_moduleEPKcPFvvE (./test.so) * undefined symbol: _Py_NoneStruct (./test.so) undefined symbol: PyLong_FromLong (./test.so) undefined symbol: PyLong_Type (./test.so) However nm confirms that the symbol exists in /usr/local/lib/libboost_python3.so.1.46.1: $ nm /usr/local/lib/libboost_python3.so.1.46.1 | c++filt | grep init_module 00031a00 T boost::python::detail::init_module(PyModuleDef&, void (*)()) I've tried running ldconfig to update the library cache, as well as compiling the extension with -lpython3.1, but no luck. Ideas appreciated, Vivek

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[Boost Serialization] Problem serializing derived class declared in DLL
by kmdarkmaster 13 Jun '11

13 Jun '11

Dear Boost community, My problem is simple : I need to serialize a derived class (named Plugin) of a c++ class (named Base) in my main program. The derived class Plugin is declared in a DLL which is load explicitely during execution. I tried to use the macro BOOST_CLASS_EXPORT_GUID (as in the doc), this works perfectly if the derived class is in the main execution, but will give me an exception if the derived class is in the plugin DLL. Forgive me if the problem is too obvious, this is my first time using Boost and I'm still a big noob in c++. Here is my code : IN THE MAIN EXECUTION : Class Base (parent class) : Base.h : #pragma once; #include "boost\serialization\access.hpp" #include <boost\serialization\nvp.hpp> class Base { private: friend class boost::serialization::access; template void serialize(Archive & ar, const unsigned int version){} public: int a, b; Base(); virtual ~Base() { } virtual void func()= 0; // this is an abstract base class } Base.cpp: #include "StdAfx.h" #include "Base.h" Base::Base(){ a=0; b=0; } IN THE DLL (loaded explicitely) Class Plugin (Child Class) : Plugin.h: #pragma once #include "boost\serialization\access.hpp" #include <boost\serialization\nvp.hpp> #include "boost\serialization\export.hpp" #include "Base.h" class Plugin: public Base { private: friend class boost::serialization::access; template void serialize(Archive & ar, const unsigned int version){ ar & BOOST_SERIALIZATION_BASE_OBJECT_NVP(Base); ar & BOOST_SERIALIZATION_NVP(a); ar & BOOST_SERIALIZATION_NVP(b); } public: virtual void func(); }; BOOST_CLASS_EXPORT_GUID(Plugin, "Plugin") Plugin.cpp: #include "StdAfx.h" #include "Plugin.h" void Plugin::func(){ a= 5; b= 6; } THE MAIN FUNCTION (IN THE MAIN EXECUTION): ....................................... HINSTANCE hinst= LoadLibrary(L"monDLLdynamique.dll"); if (hinst) { CreatePlugin ctor= (CreatePlugin)GetProcAddress(hinst, "CreatePlugin"); Base *test= ctor(); std::ofstream ofs3("FichierPointeursDerivedDLL.xml"); { boost::archive::xml_oarchive oa(ofs3); oa << BOOST_SERIALIZATION_NVP(test); } ofs3.close(); delete test; // calls Plugin's dtor FreeLibrary(hinst); } ............................................ Any help will be very very appreciated !!! Thanks -- View this message in context: http://boost.2283326.n4.nabble.com/Boost-Serialization-Problem-serializing-… Sent from the Boost - Users mailing list archive at Nabble.com.

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Is boost test thread-safe?
by edA-qa mort-ora-y 31 May '11

31 May '11

I searched a bit but was unable to find a reasonable answer. Is the test framework thread-safe? I am asking since when I do threaded tests I get weird and seemingly random output. By thread-safe I don't mean that I have multiple tests running at the same time, but simply that I have tests which involve multiple threads. For example: BOOST_AUTO_TEST_CASE( threaded ) { thread a( func_a ); thread b( func_b ); a.join(); b.join(); } void func_a() { ... BOOST_CHECK_EQUAL( 123, var ); } It appears that using the BOOST_CHECK tools from the thread causes problems. -- edA-qa mort-ora-y -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- Sign: Please digitally sign your emails. Encrypt: I'm also happy to receive encrypted mail.

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[Lambda] Handling Bind/Lambda name clashes.
by Robert Jones 25 May '11

25 May '11

Im compiling in an environment which #includes <boost::bind.hpp>, so I can't get away from it! I'd like to use Boost.Lambda sometimes, but run into namespace clashes. This code snippet works... #include <boost/lambda/lambda.hpp> #include <boost/lambda/bind.hpp> #include <boost/range.hpp> #include <vector> #include <numeric> // and also this... #include <boost/bind.hpp> struct X { int f( ) const { return 1; } }; int sum( int a, int b ) { return a + b; } int main( ) { boost::lambda::placeholder1_type x; boost::lambda::placeholder2_type y; std::vector<X> v; std::accumulate( boost::begin( v ), boost::end( v ), 0, bind( sum, x, bind( &X::f, y ) ) ); } but as soon as I extract the innermost bind into a Boost.Function, I seem to need to fully qualify all the binds, ie int main( ) { boost::lambda::placeholder1_type x; boost::lambda::placeholder2_type y; std::vector<X> v; boost::function<int(int, int)> my_sum = bind( sum, x, y ); std::accumulate( boost::begin( v ), boost::end( v ), 0, boost::lambda::bind( my_sum, x, bind( &X::f, y ) ) ); } Is there any easy way around this? It would be nice to able to name my inner binds in a meaningful way, but all the explicit qualification gets a bit cumbersome! Thx - Rob.

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Asio unhandled exception
by Łukasz Majewski 20 May '11

20 May '11

Hello, I created a server single thread async (linux) and clinet (win). Every time client is close while server is writing to the socket connected to this client exception appears: terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error>>' what(): Transport endpoint is not connected Aborted and server is terminated. I dont know why this exception is unhandled. int main( int argc, char** argv ) { try { boost::asio::io_service io_service; quotation_server server( io_service ); while ( true ) { try { io_service.run(); } catch( ... ){} } } catch ( std::exception& e ) { LOG << e.what() << std::endl; } catch( ... ) { LOG << "Unexpected exception" << std::endl; } return 0; }

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[boost-users][GIL] Colors broken after moving to New IO
by Szymon Gatner 15 May '11

15 May '11

Hi, Since New IO is now accepted to BOOST I could replace old one with new version (review one). Problem is, the moment I replaced header file and png_load_file() to load_image() all images have invalid colors. Am I doing to little by just replacing those 2? Regadrds, Szymon

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