Reply to TSalm,
Yes, you are right. But this is an example code. The "true" code uses delegates with argument which differs from called functions, so I can't point delegate directly to them. And this anonymous function's way is really fastest to code... I must waiting for a D2 stable version ;-) Thanks
you can store off the values you need like this: struct C(R, A...) { A args; R function(A) dg; static R delegate() opCall(R function(A) dg, A a) { C!(R, A) ret; ret.dg=dg; foreach(int i,_;A) ret.args[i] = a[i]; return &ret.fn; } R fn() { return dg(args); } } // test it import std.stdio; int delegate() dg(int i) { return C!(int,int)(function int(int j){return j;}, i); // <--- used here } void main() { auto d = dg(5); writef("%s\n", d()); }