Wait and repeat

You want something to happen later (the shot reloading, the bomb exploding) or from time to time (an enemy shooting every second).

#include <brasa/brasa.hpp>
using namespace brasa;

class Bomb : public Entity {
public:
    void onSpawn() override {
        afterSeconds(3, [this] { destroy(); });      // explodes in 3 seconds
        every(30, [this] { visible = !visible; });   // blinks every half second
    }
};
BRASA_ENTITY(Bomb);

How it works

• The game runs at 60 steps per second. after(60, ...) waits 1 second, and after(30, ...) waits half.
• after(steps, ...) runs the lambda once, after that many steps.
• every(steps, ...) runs it always, every that many steps.
• afterSeconds(seconds, ...) is after counted in seconds.
• The timers go away by themselves when the object is destroyed.

Variations

Cancel. Every timer function returns a TimerId. Keep it to cancel later:

// in the class: TimerId blink_;
blink_ = every(30, [this] { visible = !visible; });
// ... later:
cancel(blink_);
visible = true;

An interval that changes. A function that schedules itself again with after can change the interval each time, like the Spawner of the tutorial.

See also

• Timers.