Cppyy exclusion based on method arguments?

Question

It is possible to exclude class methods in CPPYY based on their function arguments?

For example, suppose that a class has two constructors:

class A
{
 A(int);
 A(double);
};

Is it possible to select class A but exclude one of the two constructors?

Selecting and excluding classes/methods is done using the genreflex utility, which uses an XML file to configure CPPYY. But it's not clear if that the XML file supports this level of specification.

score 1 · Accepted Answer · answered Aug 21 '19 at 15:45

Posting here as well for completeness:

No, no such feature exist. (It’s part of the lcgdict spec to exclude a method wholesale, but I don’t think that that’s even implemented.)

If you want to reduce the ctors to just 1, that’s quick & easy in Python. Example:

import cppyy

cppyy.cppdef("""
class A
{
public:
 A(int) { std::cerr << "int called" << std::endl; }
 A(double) { std::cerr << "double called" << std::endl; }
};
""")

def pythonize_A(klass, name):
    if name == 'A':
        klass.__init__ = klass.__init__.__overload__("int")

cppyy.py.add_pythonization(pythonize_A)

from cppyy.gbl import A

a = A(1)
b = A(1.) # <- fails with TypeError

and in principle you could even write a custom __init__ that does overloading on the constructors that you do want to preserve (e.g. a simple loop over a subset selected using __overload__).

Alternatively, you can use cross-inheritance to achieve the same.

Cppyy exclusion based on method arguments?

1 Answers1