foreach over enums?

[Simen kjaeraas]

%u <e at ee.com> wrote:

> The code didn't compile, so I tried fixing it.. and failed as I don't  
> really get
> what you want it to do (or even how to call it :)
> Please explain it to me.

Sorry, it was late and I was tired. Updated code (tested, even! :p):


module foo;

import std.stdio;

template defineStaticImpl( T, int value, string name, args... ) {
	mixin( "static T " ~ name ~ " = cast(T)value; " );
	static if ( args.length != 0 ) {
		mixin defineStaticImpl!( T, value + 1, args );
	}
}

template defineStatic( T, args... ) {
	mixin defineStaticImpl!( T, 0, args );
}

struct defineEnum( T... ) {
	int value;
	static const int num = T.length;
	mixin defineStatic!( typeof( this ), T );
	
     static int opApply( int delegate( ref defineEnum ) dg ) {
         int result = 0;
         foreach ( i, e; T ) {
             result = dg( defineEnum( i ) );
             if ( result ) {
                 break;
             }
         }
         return result;
     }
	
	static defineEnum opCall( int value ) {
		defineEnum tmp;
		tmp.value = value;
		return tmp;
	}
	
	string toString( ) {
		foreach ( i, e; T ) {
			if ( i == value ) {
				return e.dup;
			}
		}
	}
}
void main( ) {
	alias defineEnum!( "A", "B", "C" ) Bar;
	foreach ( e; Bar ) {
		writefln( e );
	}
}

-- 
Simen