Re: Overriding to!string on enum types

[monarch_dodra via Digitalmars-d-learn]

On Tuesday, 2 September 2014 at 14:59:41 UTC, evilrat wrote:
sorry, i forgot everything.
here is example of how to do this
-----
import std.conv : to;

enum Test
{
 One,
 Two,
 Three,
}


template to(T: string)
{
 T to(A: Test)(A val)
 {
  final switch (val)
  {
   case Test.One: return "1";
   case Test.Two: return "2";
   case Test.Three: return "3";
  }
 }
}


void main()
{
assert(to!string(Test.One) == "1");
auto t = cast(Test)2;
assert(to!string(t) == "3");
assert(to!int("4") == 4); // shows original to! template works
}

Word of warning: You are not overriding "to", but rather, simply 
defining your own "to" locally, which resolves as a better match 
in the context where you are using it.

If you pass the enum to another function in another module, your 
"to" will NOT be called.