gistfile1.d

import std.string;
import std.stdio;
import std.range;

mixin template arrayDelegator( alias instance, methods... ){
   static if( methods.length > 0 ){
        static if( methods[0] == "opIndexAssign" ){
            mixin("
    void opIndexAssign( " ~ ElementEncodingType!(typeof(instance)).stringof ~ " value, size_t index ){ 
        array[index] = value;
    }
                 ");
        }
        else static if( methods[0] == "opIndex" ){
            mixin(
    ElementEncodingType!(typeof(instance)).stringof ~ " opIndex( size_t index ){
        return instance[index];
    }
                 ");
        }
        else static if( methods[0] == "length" ){
             mixin("
    @property size_t length(){
        return instance.length;
    }
                  ");
        }
        else
            static assert( false );
        static if( methods.length > 1 )
            mixin arrayDelegator!( instance, methods[1 .. $ ] );
    }
}

class Container{
    size_t[] array;

    mixin arrayDelegator!(array, "opIndexAssign", "opIndex", "length");
    
    this( size_t[] a ){
        array = a;
    }

}

void main( string[] args ){
    Container c = new Container( [0u, 1u, 2u, 3u] );
    writeln( c[2] );
    c[2] = 4u;
    writeln( c[2] );
}