[Tutor] C API Tutorial Class Question

[Arthur Coleman]

I am using Windows XP and have successfully build the Boost libraries, plus
boost_python.dll.  I am trying to work through the C API tutorial where the
file hello.cpp is found at libs/python/example/tutorial.  I have been able
to compile and execute the first example building the supplied hello.cpp
file that allows Python to import a C function, but when I move onto the
next example in the tutorial:

 

struct World
{
    void set(std::string msg) { this->msg = msg; }
    std::string greet() { return msg; }
    std::string msg;
};

 

#include <boost/python.hpp>
using namespace boost::python;
 
BOOST_PYTHON_MODULE(hello)
{
    class_<World>("World")
        .def("greet", &World::greet)
        .def("set", &World::set)
    ;
}

 

 I replace the original contents of hello.cpp with the above code and using
bjam tried to build hello.pyd.  I receive the following errors:

 

...found 1513 targets...

...updating 4 targets...

vc-C++ bin\tutorial\hello.pyd\vc-8_0\debug\threading-multi\hello.obj

hello.cpp

hello.cpp(22) : error C2976: 'boost::python::class_' : too few template
arguments

        G:\boost_1_33_1\boost/python/def_visitor.hpp(14) : see declaration
of 'boost::python::class_'

hello.cpp(22) : error C2440: '<function-style-cast>' : cannot convert from
'const char [6]' to 'boost::python::class_'

        Source or target has incomplete type

hello.cpp(22) : error C2228: left of '.def' must have class/struct/union

hello.cpp(22) : error C2228: left of '.def' must have class/struct/union

hello.cpp(22) : error C2143: syntax error : missing ';' before '}'

 

    CALL "C:\Program Files\Microsoft Visual Studio 8\VC\bin\vcvars32.BAT"
>nul

    "C:\Program Files\Microsoft Visual Studio 8\VC\bin\cl" /Zm800 -nologo
/EHsc -c  -DBOOST_PYTHON_DYNAMIC_LIB /Z7 /Od /Ob0 /EHsc /GR /MDd
/Zc:forScope /Zc:wchar_t -I"bin\tutorial"  -I"G:\boost_1_33_1"
-I"c:\Python25\include"
-Fo"bin\tutorial\hello.pyd\vc-8_0\debug\threading-multi\hello.obj"
-Tp"hello.cpp"

 

...failed vc-C++
bin\tutorial\hello.pyd\vc-8_0\debug\threading-multi\hello.obj...

...skipped <@tutorial\hello.pyd\vc-8_0\debug\threading-multi>hello.CMD for
lack of <@tutorial\hello.pyd\vc-8_0\debug\threading-multi>hello.obj...

...skipped <@tutorial\hello.pyd\vc-8_0\debug\threading-multi>hello.pyd for
lack of <@tutorial\hello.pyd\vc-8_0\debug\threading-multi>hello.CMD...

...skipped <@tutorial\hello.pyd\vc-8_0\debug\threading-multi>hello.lib for
lack of <@tutorial\hello.pyd\vc-8_0\debug\threading-multi>hello.CMD...

...failed updating 1 target...

...skipped 3 targets...

 

I reviewed the definition of class_ in file def_visitor.hpp and found that
it was defined as:

 

template<T1, X1, X2, X3> class class_;

 

I have tried searching the FAQ and the Web and so far no luck.  I would
appreciate any help.

 

Arthur

 

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