Fun with allMembers

[Andrei Alexandrescu]

Shin Fujishiro wrote:
> Hi,
> 
> I've had fun with the allMembers traits over the past few days and found
> it more powerful than I thought.
> 
> __traits(allMembers, T) returns the member names of T. As some might
> already know, T is not restricted to a class or struct; it can also be
> an enum, template, or even module. Try this:
> --------------------
> enum E { a, b, c }
> template T() { int x, y, z; }
> import std.stdio;
> pragma(msg, __traits(allMembers, E).stringof);
> pragma(msg, __traits(allMembers, T).stringof);
> pragma(msg, __traits(allMembers, std.stdio).stringof);
> --------------------
> You'll like the result :). It must be usable!
> 
> For example, using allMembers with enums, I could implement
> enumToString and enumFromString without defineEnum.
> Code: http://codepad.org/HVvPjoI7
> 
> So, what other uses could there be?

Wow, I didn't know about this! It might as well be everything needed for 
a full-blown compile-time reflection package!

To answer your question: for starters, try to implement BlackHole and 
WhiteHole as explained here:

http://erdani.dreamhosters.com/cranking-policies-up.pdf


Andrei