CoroutineExtensions.cs

using UnityEngine;
using System;
using System.Collections;

/* Example of how to use
// from rony in #unity3d on Freenode
// the idea is to reduce the code needed for very simple coroutine cases in c# in Unity3D
// in a monoBehaviour
private int hp = 10;

void Start() {

    //executes the debug.log() after 2 seconds.
    this.ExecuteLater(() => Debug.Log("coucou! 5s"), 2.0f);

    //executes the debug.log() when hp < 5
    this.ExecuteWhen(() => Debug.Log("You lost Life!"), () => hp < 5);

    //executes the given instructions after 6 seconds
    this.ExecuteLater(() => { Debug.Log("changing HP"); hp = 4; }, 6.0f);
}
*/

public static class CoroutineExtensions {
    public delegate bool When();

    public static void ExecuteWhen(this MonoBehaviour m, Action action, When condition) {
        m.StartCoroutine(ExecuteWhenCoroutine(action, condition));
    }

    public static void ExecuteLater(this MonoBehaviour m, Action action, float seconds) {
        m.StartCoroutine(ExecuteLaterCoroutine(action, seconds));
    }

    private static IEnumerator ExecuteWhenCoroutine(Action action, When condition) {
        while (!condition()) {
            yield return null;
        }

        action();
    }

    private static IEnumerator ExecuteLaterCoroutine(Action action, float seconds) {
        yield return new WaitForSeconds(seconds);
        action();
    }
}