Question

I’m trying to get a pointer to a specific version of an overloaded member function. Here’s the example:

class C {   bool f(int) { ... }   bool f(double) { ... }    bool example()   {     // I want to get the 'double' version.     typedef bool (C::*MemberFunctionType)(double);     MemberFunctionType pointer = &C::f;   // <- Visual C++ complains   } }; 

The error message is ‘error C2440: ‘initializing’ : cannot convert from ‘overloaded-function’ to ‘MemberFunctionType”

This works if f is not overloaded, but not in the example above. Any suggestion?

EDIT

Beware, the code above did not reflect my real-world problem, which was that I had forgotten a ‘const’ – this is what the accepted answer points out. I’ll leave the question as it is, though, because I think the problem could happen to others.

Answer 1

Well, i’ll answer what i put as comment already so it can be accepted. Problem is with constness:

class C {   bool f(int) { ... }   bool f(double) const { ... }    bool example()   {     // I want to get the 'double' version.     typedef bool (C::*MemberFunctionType)(double) const; // const required!     MemberFunctionType pointer = &C::f;   } }; 

Clarification:

The original question didn’t contain that const. I did a wild guess in the comments whether he possibly has f being a const member function in the real code (because at a yet earlier iteration, it turned out yet another thing was missing/different to the real-world code :p). He actually had it being a const member function, and told me i should post this as an answer.