Inheritance from multiple interfaces with the same method name

[Mike Franklin]

On Wednesday, 6 December 2017 at 23:56:33 UTC, Q. Schroll wrote:

>
> What is D's position on that? The interface spec [2] does not 
> say anything about that case.
>

It seems it's allowed, but the caller is required to disambiguate.

import std.stdio;

interface I { void f(); }
interface J { int f(); }
class A : I, J
{
     void f() { writeln("void f()"); }
     int f() { writeln("int f()"); return 0; }
}

void main()
{
     A a = new A();

     // Error: A.f called with argument types () matches both: 
A.f() and A.f()
     // Yeah, that error message could be better.
     //a.f();

     (cast(I)a).f(); // prints "void f()"
     (cast(J)a).f(); // prints "int f()"
}

https://run.dlang.io/is/lZSblC

Mike