Just one time

[Ali Çehreli via Digitalmars-d-learn]

On 10/20/2015 08:48 AM, Andrea Fontana wrote:
> It happens I need to perform an operation just one time (inside a
> function, a loop...)

An idea that uses a function pointer where the first step does its task 
and then sets the stage for the following steps:

import std.stdio;
import std.range;
import std.algorithm;

void firstStep() {
     writeln("First call!");
     takeAStep = &followingSteps;
}

void followingSteps() {
     writeln("Just another call");
}

auto takeAStep = &firstStep;

void main() {
     3.iota.each!(_ => takeAStep());
}

First call!
Just another call
Just another call

Ali