Re: [boost] implicit_cast

From: Paul Mensonides (pmenso57_at_[hidden])
Date: 2002-11-21 19:41:34

----- Original Message -----
From: "David Abrahams" <dave_at_[hidden]>

> Thoughts?

We also need this:

template<class func> inline func& ambiguity_cast(func& rf) {
    return rf;
}

...which casts away ambiguity of a function call--even by return type.
Maybe add a static assertion to enforce function types.

#include <iostream>

namespace A {
    int f() {
        std::cout << "int A::f()" << &std::endl;
        return 0;
    }
}

namespace B {
    double f() {
        std::cout << "double B::f()" << &std::endl;
        return 0.0;
    }
}

using A::f;
using B::f;

int main() {
    ambiguity_cast<double ()>(f)();
    return 0;
}

It also allows you to not apply explicit casts to several parameters to
select the function you want:

#include <iostream>

int f2(int x, int y) {
    return x + y;
}

double f2(double x, double y) {
    return x + y;
}

int main() {
    int x = ambiguity_cast<int (int, int)>(f2)(2.5, 3.5);
    return 0;
}

;)

Paul Mensonides