Initializing defaults based on type.

[Benjamin Thaut via Digitalmars-d-learn]

On Friday, 6 March 2015 at 15:36:47 UTC, anon wrote:
> Hi,
>
> I can't figure this out.
>
> struct Pair(T)
> {
>    T x;
>    T y;
>
>    alias x c;
>    alias y r;
> }
>
> What would like is that the x and y to be initialized to 
> different values depending on type eg:
>
> struct Container
> {
>   Pair!double sample1; // This will initialize sample1 with 0 
> for both x and y
>   Pair!int    sample2; // This will initialize sample2 with 1 
> for both x and y
> }
>
> currently I'm using two different struct one with doubles and 
> the other with ints and initialized with default value but was 
> wondering if its possible to do the above.
>
> anon

struct Pair(T)
{
  static if(is(T == int))
    enum int initValue = 1;
  else
    enum T initValue = 0;

    T x = initValue;
    T y = initValue;

    alias x c;
    alias y r;
}