Your First Game – Air Hockey - Cocos2d-x by Example Beginner's Guide - page 80

vector of movement; we'll need this when we collide the player with the puck.
The vector is based on the player's displacement.
3. In onTouchesEnded, we add this:
for (auto player : _players) {
if (player->getTouch() != nullptr &&
player->getTouch() == touch) {
//if touch ending belongs to this player, clear
it
player->setTouch(nullptr);
player->setVector(Vec2(0,0));
}
}
We clear the _touch property stored inside the player if this touch is the one just ending.
The player also stops moving, so its vector is set to 0 . Notice that we don't need the loca-
tion of the touch anymore; so in TouchesEnded you can skip that bit of logic.