I'm not looking for help on exposing virtual functions to Python, I would like to know how I can call the said virtual functions from the C++ side. Consider this...
// ====================
// C++ code
// --------------------
struct Base
{
virtual void func() {
cout << "Hello from C++!";
}
};
BOOST_PYTHON_MODULE(name)
{
// Expose the class and its virtual function here
}
// ====================
// Python code
// --------------------
from name import Base
class Deriv(Base):
def func():
print('Hello from Python!')
Any advice on how I might grab a Base*
to the derived type such that when I do base->func()
, the Python function is called? The Boost docs only describe how to expose the virtual functions to Python, not how to call their redefinitions from C+.
我认为您只是调用extract<Base*>(obj)
,其中obj
是python::object
。
Your approach will not work in such a simple way; you have to add wrapper to your python class, from which python class will be subsequently derived. here, under 1. I explained briefly how it works. So, to call python-override of a c++ virtual method, use get_override
and call the returned object with ()
.
For some code, see eg here , where Predicate
and PredicateWrap
are defined, but then PredicateWrap
is really exposed to python; calling the overridden methods is done here , but that is hidden to the user.
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