Re: Multiply inherit from classes with conflicting function names

24 May 2006 11:36:11 -0400
Adam wrote:

I have an unfortunate case where a single class wants to derive from two
existing classes:

struct A { virtual long fun() = 0; };
struct B { virtual bool fun() = 0; };
struct Unfortunate : public A, public B { ??? };

Is it possible to fill in the ??? here with legal code?

You can introduce trivial intermediate classes to "rename" the

I need two different function bodies; A::fun and B::fun do unrelated

More or less the same question with a twist: if A::fun and B::fun both
returned the same type, would it be possible to implement two functions
in C such that
  would execute two different functions?

The intermediate classes would still work, but with a different syntax:


Here is a complete test:

#include <iostream>

struct A { virtual long fun() = 0; };
struct B { virtual bool fun() = 0; };

struct A_impl : public A
    virtual long A_fun() = 0;
    virtual long fun()
       return A_fun();

struct B_impl : public B
    virtual bool B_fun() = 0;
    virtual bool fun()
       return B_fun();

struct Unfortunate : public A_impl, public B_impl
    virtual long A_fun()
       std::cout << "long\n";
       return 0;

    virtual bool B_fun()
       std::cout << "bool\n";
       return false;

int main()
    Unfortunate u;

    // Ambiguous to call fun()

    // No ambiguity through the base interfaces
    A & a = u;;
    B & b = u;;


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