Time for action – creating the implementation

The implementation is a text file with the .cpp extension:

1. Create a new text file and save it as HelloWorld.cpp. At the top, let's start by including our header file:

   #include "HelloWorld.h"

2. Next, we implement our constructor and destructor:

   HelloWorld::HelloWorld () {
       //constructor
   }
   
   HelloWorld::~HelloWorld () {
       //destructor
   }

3. Then comes our static method:

   Scene* HelloWorld::scene() {
       auto scene = Scene::create();
       
       auto layer = HelloWorld::create();
   
       scene->addChild(layer);
   
       return scene;
   }

4. And then come our two remaining public methods:

   bool HelloWorld::init() {
       // call to super
       if ( !Layer::init() )
       {
           return false;
       }
       
       //create main loop 
       this->scheduleUpdate();
       
       return true;
   }
   
   void HelloWorld::update (float dt) {
       //the main loop
   }

What just happened?

We created the implementation for our HelloWorld class. Here are the most important bits to take...