Re: Amusing D facts: typesafe variadic arrays are lazy!

[Andrei Alexandrescu]

Max Samukha wrote:

On Tue, 13 Oct 2009 15:06:25 +0200, downs <default_357-l...@yahoo.de>
wrote:

Did you know the following code compiles?

module test;

import std.stdio;

void Assert(bool cond, string delegate()[] dgs...) {
  debug if (!cond) {
    string str;
    foreach (dg; dgs) str ~= dg();
    throw new Exception(str);
  }
}

void main() {
  Assert(false, "O hai thar! ");
}

It's true! :)

Yes, it is documented. "Lazy Variadic Functions" on "Functions" page.

Awesome. I'll replace the use of lazy in enforce() with that.

Andrei