toString() on struct template

[Reiner Pope]

Henning Hasemann wrote:
> I have a struct template with just 2 data members
> (thats why I'd actually preferred a struct over a class).
> 
> It implements several methods such as overloaded operators
> and the pseudo constructor roughly like this:
> 
> struct Vector2d(T) {
> 	T x, y;
> 	Vector2d!(T) opCall(T x, T y) {
> 	  Vector2d!(T) v;
> 	  v.x = x;
> 	  v.y = y;
> 	  return v;
> 	}
> 	char[] toString() {
> 	  return format("(%d|%d)", x, y);
> 	}
> }

I couldn't get your code to work as is, because it wasn't a 'static' 
opCall. The following code, however, runs fine on my computer:

> import std.stdio;
> import std.string;
> 
> struct Vector2d(T) {
> 	T x, y;
> 	static Vector2d!(T) opCall(T x, T y) {
> 	  Vector2d!(T) v;
> 	  v.x = x;
> 	  v.y = y;
> 	  return v;
> 	}
> 	char[] toString() {
> 	  return format("(%d|%d)", x, y);
> 	}
> }
> 
> void main()
> {
>     auto a = Vector2d!(int)(5, 6);
>     writefln(a.toString());
> }

Hope that helps,

Reiner