opDispatch and compile time parameters

[Jack Applegame via Digitalmars-d]

D template system is very powerful.  This is more generic 
solution:

import std.stdio;
class B {
     auto p1(T)(T arg) { writeln( "p1: ", arg ); }
     auto p2(T, int C)(T s) { writeln( "p2: ", s, " / ", C); }
}
class C(T) {
     T b = new T;
     template opDispatch(string s) {
         template opDispatch(TARGS...) {
             auto opDispatch(ARGS...)(ARGS args) {
                 static if(TARGS.length) return mixin("b." ~ s ~ 
"!TARGS(args)");
                 else return mixin("b." ~ s ~ "(args)");
             }
         }
     }
}

void main() {
     auto b = new C!(B)();
     b.p1("abc");
     b.p2!(int, 10)(5);
}

http://dpaste.dzfl.pl/791c65d0e4ee