RateLimiter for various purposes

RateLimiter.cs

class RateLimiter {
    public int fps = 100;
    public bool isActive = true;
    private float? timer = null;
    public RateLimiter(int fps, bool immediate = false) {
        this.fps = fps;
        if (immediate) this.Invalidate();
        else this.Reset();
    }

    // invaliding RateLimiter makes it fire on next check
    public bool Invalidate() {
        this.timer = 0;
        return false;
    }
    // resetting the RateLimiter makes it wait it the next execution time frame
    public bool Reset() {
        // assigning the timer to null will make the CanFire assign the initial time to the timer, limiting the rate
        this.timer = null; 
        return false;
    }

    public bool CanFire(float? time = null) {
        if (!this.isActive) return false; // inactive

        // allow optional custom time to be dictated from outside
        float timeToUse = time.HasValue ? time.Value : Time.time; 
        // assign the timer either to itself (case present), or assign it to the dictated time
        // this will allow us to await the next fire-able tick
        this.timer = this.timer.HasValue ? this.timer.Value : timeToUse;
        
        return (timeToUse - this.timer) > ( 1 / this.fps);
    }

    public bool Fire(float? time = null) {
        if (this.CanFire(time)) {
            this.Reset();
            return true;
        }

        return false;
    }
}