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List:       python-cpp-sig
Subject:    [C++-sig]  Calling python virtual function from C++
From:       William_Marié <william.marie () gmail ! com>
Date:       2009-01-28 18:16:25
Message-ID: 21711534.post () talk ! nabble ! com
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Hi,

I have a little problem, i can't find a way to call a pure virtual function
from C++ on a Python object taking a specific class object as argument :

// Base Class for a component
class BaseCmp
{
public:
	~BaseCmp() {};
};

// Base class
class Base
{
public:
	Base() {};
	virtual ~Base() {};
	virtual void testVirtualPure( BaseCmp* pBaseCmp ) = 0;
};

struct BaseWrap : Base, bp::wrapper<Base>
{
	void testVirtualPure( BaseCmp* pBaseCmp )
	{
		this->get_override("testVirtualPure")( pBaseCmp );
	}
};


// Module TestScript
BOOST_PYTHON_MODULE(test)
{
	// BaseCmp Class exposition
	bp::class_<BaseCmp,boost::noncopyable>("BaseCmp", bp::no_init)
                 ;

	// Base Class Wrapper exposition
	bp::class_<BaseWrap, boost::noncopyable>("Base")
		.def( "testVirtualPure", bp::pure_virtual( &Base::testVirtualPure ) )
		;
} 

I need to call my testVirtualPure function from C++ side : 
BaseCmp* bc = BaseCmp();
Base* b = Base();
b->testVirtualPure( bc );

But this causes an error : 
TypeError: No to_python (by-value) converter found for C++ type: class
BaseCmp

Does someone know how i can do  that ?

Thanks a lot
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