[C++-sig] Creating a python class from c++

[Stefan Seefeld]

James Healey wrote:
> If I have this:
> 
> class Test
> {
> public:
> 	int iNumber;
> 
> 	int getNumber(void) { return iNumber; }
> };
> 
> BOOST_PYTHON_MODULE( extended_test )
> {	
> 	boost::python::class_<Test>("Test")
> 		.def( "getNumber", &Test::getNumber )
> 		;
> }
> 
> boost::python::object my_class = global["MyTest"];
> 
> How would I go about creating an instance of class
> Test and passing it to my python class instance?
> 
> boost::python::object my_instance = my_class(test
> boost::python::object retn =
> my_instance.attr("TestFunc")();

I'm not sure what you are trying to accomplish. Are you asking how
to detach the lifetime of the C++ Test instance from the lifetime of
the Python Test instance ?

In that case it seems most suitable to export a C++ function
returning your (C++) Test instance, letting boost.python wrap the existing
instance, instead of instantiating the wrapper with a copy of it.
You may want to read the docs on call- / return-value policies, too.


HTH,
		Stefan


-- 

      ...ich hab' noch einen Koffer in Berlin...