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