Method receive

examples/example.cc:318–323

  }

  void receive(const CollisionEvent &collision) {
    // Events are immutable, so we can't destroy the entities here. We defer
    // the work until the update loop.
    collided.insert(collision.left);
    collided.insert(collision.right);
  }

private:
  std::unordered_set<ex::Entity> collided;