Re: Interface file

[Jan Johansson via Digitalmars-d]

On Wednesday, 30 September 2015 at 19:17:41 UTC, Steven 
Schveighoffer wrote:
On 9/30/15 2:12 PM, Jan Johansson wrote:

[...]

There is no reason to use interfaces here, you can separate 
declaration from implementation without them:

test.di:

module test;
class MyTest {
   void Write(string message);
}

test.d:

module test;

class MyTest {
   void Write(string message) {
      writeln(message);
   }
}


main.d:

import test; // will work even if only test.di is available
import std.stdio;

void main() {
   auto p = new MyTest;
   p.Write("Hello, World!");
}

Interfaces are only necessary when you are unsure what concrete 
type you need until runtime.

-Steve

Thanks Steve,

Your last statement is exactly what I want to do! Using contract 
based design, and factories to instantiate types that implements 
the interface.

//Jan