Re: How can I do lazy variable initialization?

[Ali Çehreli via Digitalmars-d-learn]

Explicit with a lambda:

import std;
int heavyLoadOperation() {
  writeln("Expensive!");
  return uniform(0, 10);
}

void main(string[] args) {
  const l = {
    bool inited = false;
    static int i;
    if (!inited) {
      i = heavyLoadOperation();
    }
    return i;
  }();

  if (args.length == 1) {
    writefln!"Using lazy variable: %s %s"(l, l);
  }
}

Getting help from memoize (this one is lovely):

alias lightLoadOperation = memoize!heavyLoadOperation;

  const l = lightLoadOperation();

And of course, the first approach can be wrapped in a type like C#'s 
lazy as well.

Ali