Quick and Easy Sprite –Victorian Rush Hour - Cocos2d-x by Example Beginner's Guide - page 200

The terrain object
This object contains the individual Block objects that form the landscape. It contains just
enough Block objects to fill the screen, and as the _terrain object scrolls to the left,
the Block objects that leave the screen are moved to the far right side of the _terrain
and reused as new blocks, ensuring continuous scrolling.
The _terrain object is also responsible for collision checks with the _player object,
since it has quick access to all information we'll need for collision detection; namely the list
of blocks currently on the screen, their size, type, and position. Our main loop then will call
on the Terrain object to test for collision with the player object.
Let's work on these main objects, starting with the Player object.