[C++-sig] How do I wrap virtual methods

[Eric Jardim]

2005/8/5, David Abrahams <dave at boost-consulting.com>:
> 
> > So, what is the right and safe way to wrap virtual methods?
> 
Everything the tutorial says, aside from the definition and use of
> default_f, seems to be right.
> 

I have more doubts. 

1 - using the wrapper<...> approach, the tutorial suggests me that I should 
expose my class like this:

class_<BaseWrap, boost::noncopyable>("Base")
    .def("f", &Base::f, &BaseWrap::default_f)
;

But what if some "Base" object where create, not by the Python code. As I 
exposed "BaseWrap", "Base" was not actually exposed. Will it be a problem?


2 - How do I expose the constructors of the "Base" class on the "BaseWrap" 
class? Should I define it again? Should I define the PyObject* as the first 
parameter, or treat it as a normal class?

The solution I think will work:
I think that I will have to create 2 kind of objects. The normal "QObject" 
wrapper, whithout the virtual functions overriden, and a "QCustomObject", 
class that will never be created by C++ classes. If the user wants to 
reimplement any virtual function, he should use this class.

If what I say is wrong, or a bad idea, just tell me.

[Eric Jardim]
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