May 2009 - Boost-users - lists.preview.boost.org

[boost-users][python]
by Germán Diago 01 May '09

01 May '09

I have a question about managing python objects. I have a base class implemented in c++, which I use in python. >From python I inherit that class. And the I try to use the python instance from c++, like this. //This class has a function which is registered in python. I want to //be able to register python instances with this class class AnotherClass { void registerobject(const std::string & name, MyBaseClass * a) { v.push_back(a); } }; //Interface class, which I inherit in python class MyBaseClass { virtual const std::string getData(Object * o) const = 0; }; >From python: class MyPyClass(MyBaseClass): def __init__(self): MyBaseClass.__init__(self) def getData(self, o): return "hello" My question is. In order to register that class, namely, MyPyClass(which is a python class): can I do it through registerobject? Or should I implement something like this?: class AnotherClass { void registerobject(const std::string & name, python::object & o) { MyBaseClass * m = extract<MyBaseClass>(o); v.push_back(m); } }; In all two cases I get error_already_set exception when I try to execute the registerobject function and don't know why.

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[statechart] Asynch statechart in dll
by Bill Clark 01 May '09

01 May '09

I have modified the Pingpong sample (an asynchronous statechart) so that the statechart itself is in a dll, with the calling code (in PingPong.cpp) in an exe. This is using VS2005 sp1. I have used a macro in the usual way to mark the Player class as exported. The app builds and runs, but it seems that events don't get acted on. We hit Player's initiate_impl(), and we get to state_machine::process_event() with a BallReturned event passed in, but we never hit the handler for that event (Waiting::react(const BallReturned&)). Is this something that should work? Is it necessary to do something more than just export the necessary classes from the dll? Thanks, Bill **

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Overloading errors
by A B 01 May '09

01 May '09

Does anyone know why the following sample fails (it was adapted from the boost overloading example) and how to do this correctly. Thanks in advance. #include <boost/python/module.hpp> #include <boost/python/def.hpp> #include <boost/python/args.hpp> #include <boost/python/tuple.hpp> #include <boost/python/class.hpp> #include <boost/python/overloads.hpp> #include <boost/python/return_internal_reference.hpp> using namespace boost::python; struct X { int f(int x, double y = 4.25, char const* z = "wow") { return x; } int f(int x, bool b = true) { return x; } }; BOOST_PYTHON_MEMBER_FUNCTION_OVERLOADS(f_member_overloads, X::f, 1, 3) BOOST_PYTHON_MODULE(args_ext) { class_<X>("X", "This is X's docstring") .def("f1", &X::f, f_member_overloads(args("x", "y", "z"), "f's docstring" )[return_internal_reference<>()] ) ; } g++ -fpic -shared -o test.so test.cpp -lpython2.4 -lboost_python -I/usr/include/python2.4 test.cpp: In function ‘void init_module_args_ext()’: test.cpp:31: error: no matching function for call to ‘boost::python::class_<X, boost::python::detail::not_specified, boost::python::detail::not_specified, boost::python::detail::not_specified>::def(const char [3], <unresolved overloaded function type>, boost::python::detail::overloads_proxy<boost::python::return_internal_reference<1ul, boost::python::default_call_policies>, f_member_overloads>)’

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Boost.Date_Time building for Windows CE
by Tory Bjorklund 01 May '09

01 May '09

Hello, My application builds fine when using Boost.Date_Time with win32 but when building with a configuration for Windows CE I get the following errors: boost/date_time/c_time.hpp(83) : error C2039: 'localtime' : is not a member of 'std' boost/date_time/c_time.hpp(83) : error C2660: 'boost::date_time::c_time::localtime' : function does not take 1 arguments boost/date_time/c_time.hpp(92) : error C2039: 'gmtime' : is not a member of 'std' boost/date_time/c_time.hpp(92) : error C2660: 'boost::date_time::c_time::gmtime' : function does not take 1 arguments boost/date_time/gregorian/gregorian_io.hpp(12) : fatal error C1083: Cannot open include file: 'locale': No such file or directory Does anyone know how I may be able to build an app for CE that includes the Date_Time library? Thanks, Tory

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Boost.MultiIndex question on merge
by arm2arm 01 May '09

01 May '09

Hello, Are there way to merge two multiindex objects ? suppouse we have : struct strData{ int id; float a, b; strData(int id_, float a_, float b_):a(a_),b(b_),id(id_){} }; typedef multi_index_container< strData, indexed_by< ordered_unique< tag<id>, BOOST_MULTI_INDEX_MEMBER(strData,int,id)>, ordered_non_unique< tag<snap>,BOOST_MULTI_INDEX_MEMBER(strData,float,a)> > > data_setA, data_setB; Are there way to do: data_setA.merge(data_setB) ? thank you beforehand. Arman. -- View this message in context: http://www.nabble.com/Boost.MultiIndex-question-on-merge-tp23277496p2327749… Sent from the Boost - Users mailing list archive at Nabble.com.

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