Quick and Easy Sprite –Victorian Rush Hour - Cocos2d-x by Example Beginner's Guide - page 198

The Player object
This represents our cyclist. It will jump, float, and collide with the _terrain object. Its x
speed is passed to the _terrain object causing the Terrain object to move, side
scrolling to the left of the screen.
The Player object derives, once again, from a GameSprite class. This one has getters
and setters for next position, vector of movement, and the sprite's width and height.
The Player interface has inline helper methods to retrieve information about its rectangle
boundaries related to its current position (left, right, top, bottom), and its next position
( next_left , next_right , next_top , next_bottom ). These will be used in colli-
sion detection with the _terrain object.