Re: foreach over enums?

[Simen kjaeraas]

%u <e...@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