So add our onTouchesBegan method:

void GameLayer::onTouchesBegan(const std::vector<Touch*> &touches, Event* event)
{
   for( auto touch : touches) {
     if(touch != nullptr) {
        auto tap = touch->getLocation();
        for (auto player : _players) {
         if (player->boundingBox().containsPoint(tap)) {
            player->setTouch(touch);
         }
       }
     }
   }
}

Each GameSprite, if you recall, has a _touch property.

So we iterate through the touches, grab their location on screen, loop through the players in the vector, and determine if the touch lands on one of the players. If so, we store the touch inside the player's _touch property (from the GameSprite class).

A similar process is repeated for onTouchesMoved and onTouchesEnded, so you can copy and paste the code...