Re: interface and class inheritance

[Oleg B]

On Thursday, 14 November 2013 at 21:45:11 UTC, Agustin wrote:

On Thursday, 14 November 2013 at 21:42:38 UTC, Agustin wrote:

On Thursday, 14 November 2013 at 21:20:57 UTC, Oleg B wrote:

[code]
import std.stdio;

interface A { void funcA(); }
class B { final void funcA() { writeln( "B.funcA()" ); } }

class C: B, A { }

void main()
{
  auto c = new C;
  c.funcA();
}
[code/]

$ dmd -run interface.d

interface.d(6): Error: class interface.C interface function 'void funcA()' is not implemented

if swap A and B
[code]
class C: A, B { }
[code/]

$ dmd -run interface.d

interface.d(6): Error: class interface.C base type must be interface, not interface.B

how to workaround this without change in class B and interface A?

Try

interface A {
 final void funcA();
}
class B {
 final void funcA() { writeln( "B.funcA()" ); }
}

class C: B, A { }

Oh sorry i mean

interface A {
  void funcA();
}

class B : A {
  final void funcA() { writeln( "B.funcA()" ); }
}

class C : B {
}

we can't change anything in class B