[Python] Appeller une fonction membre redéfinie depuis C++

Yop !

Voici mon code C++:

Code:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
namespace bp = boost::python;
 
struct Base {
	virtual void process() {}
};
 
struct BaseWrapper: public Base, bp::wrapper< Base > {
	BaseWrapper( Base const & b ) :
		Base( b ),
		bp::wrapper< Base >() {}
 
	BaseWrapper() :
		Base(),
		bp::wrapper< Base >() {}
 
	virtual void process() {
		if( bp::override fct = this->get_override( "process" ) ) {
			fct();
		} else {
			Base::process();
		}
	}
};
 
BOOST_PYTHON_MODULE( MyModule )
{
	bp::class_< BaseWrapper >( "Base" )
	  .def( "process", &Base::process );
}
 
int main( int argc, char ** argv ) {
	try {
		PyImport_AppendInittab( (char*)"MyModule", &initMyModule );
		Py_Initialize();
 
		bp::object main_module = bp::import("__main__");
		bp::object MyModule = bp::import("MyModule");
 
		bp::object main_namespace = main_module.attr("__dict__");
		main_namespace["MyModule"] = MyModule;
 
		bp::object result = bp::exec_file( "script.py", main_namespace );
 
	} catch( bp::error_already_set const& ) {
		PyErr_Print();
	}
}

Et voici mon code python:

Code:

1
2
3
4
5
6
 
import MyModule;
 
class Derived( MyModule.Base ):
  def process():
    print 'Processing';

Je vois pas comment faire en sorte que le programme C++ affiche 'Processing' en appellant Derived.process(). J'ai tenté d'extract dans tous les sens, rien à faire. Du style:

Code:

1
2
3
 
bp::object derived = bp::extract< bp::object >( main_namespace["Derived"] );	
// je ne vois pas comment je peux instancier la classe et l'upcast en Base* ici

Si j'essai de lancer directement une fonction membre j'obtiens (logiquement):

Code:

derived.attr("process")();

Code:

TypeError: unbound method process() must be called with Derived instance as first argument (got nothing instead)

Merci d'avance !

#include <boost/python.hpp> #include <iostream> #include <memory> namespace bp = boost::python; struct Base { virtual void process() { std::cout << "base" << std::endl; } virtual ~Base() {} }; bp::object obj; struct BaseWrapper: public Base, bp::wrapper< Base > { BaseWrapper( PyObject* self_, Base const & b ) : self( self_ ), Base( b ), bp::wrapper< Base >( ) { Py_INCREF( self ); } BaseWrapper(PyObject* self_) : self( self_ ), Base(), bp::wrapper< Base >() { Py_INCREF( self ); std::cout << "created!" << std::endl; } virtual void process() { if( bp::override fct = this->get_override( "process" ) ) { fct(); } else { Base::process(); } } virtual ~BaseWrapper() { std::cout << "destroyed!" << std::endl; Py_DECREF(self); } PyObject* self; }; void registerObject( bp::object o ) { obj = o; } BOOST_PYTHON_MODULE( MyModule ) { bp::class_< Base, std::auto_ptr< BaseWrapper > >( "Base" ) .def( "process", &Base::process ); def( "registerObject", registerObject ); } int main( int argc, char ** argv ) { try { PyImport_AppendInittab( (char*)"MyModule", &initMyModule ); Py_Initialize(); bp::object main_module = bp::import("__main__"); bp::object MyModule = bp::import("MyModule"); bp::object main_namespace = main_module.attr("__dict__"); main_namespace["MyModule"] = MyModule; bp::object result = bp::exec_file( "embedded.py", main_namespace ); } catch( bp::error_already_set const& ) { PyErr_Print(); } obj.attr("process")(); }