Re: Python objects not deleted

[Barry S. <ba...@ba...>]

On 30 Dec 2008, at 16:28, William Newbery wrote:

> > You can start with the python object and then get the C++ object  
> that implements it:
>
> > ExtensionObject<MyClass> obj( args[0] ); // exception thrown
> > if wrong type
> > MyClass *p = obj.extensionObject(); // get C++ pointer
>
> Ok, so basicly I just pass the ExtensionObject<T> around, and can  
> use th extensionObject() method to get a pointer to the c++ object.
>
> One thing I cant work out though, what do I construct the  
> ExtensionObject class with if I have not yet created an object to  
> store in it?
> I need to have the Py::ExtensionObject<Input> input in the D3D  
> classes deffinition, but I cant actauly create an Input instance  
> untill later in the constructor
>
> class D3d : public Py::PythonExtension<D3d>
> {
> ...
>     Py::ExtensionObject<Input> input;
> ...
> }
>
> D3d::D3d(...)
> {//error C2512: 'Py::ExtensionObject<T>' : no appropriate default  
> constructor available
> ...create window and dx stuff
>     input = new Input(this, hwnd);//cant create the Input instance  
> untill after some other stuff is created
> }

In cases like this I use a pointer:

  Py::ExtensionObject<Input> *input_ptr;

and new a Py::ExtensionObject<Input>( input ) when I have it available.

You need to create the the Py::Object to pass it back to python like  
this:

Py::ExtensionObject<Input> an_input_object( Py::asObject( new  
Input(this, hwnd) ) ) );

I've been looking at allowing Py::Object to hold NULL for V6.0.0 - but  
that targeted at Python 3.0.


Barry




Barry