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POImplementation of the replacing game scene in C++
 

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    <p>I have about 10 scene classes in my C++ game. It's something like a regular game screen (menu screen, game screen, leaderboard, options, etc). So I need some technique to replace one scene to another. I've read all comments you posted me in this thread and tried to implement it. Now I have following code:</p> <pre><code>// -----[ main.cpp ]----- // #include "SceneManager.h" #include "Scene.h" int main( int argc, const char * argv[] ) { SceneManager *sceneManager = new SceneManager(); sceneManager-&gt;changeScene( 0 ); delete sceneManager; return 0; } // -----[ Scene.h ]----- // class SceneManager; class Scene { public: SceneManager *sceneManager; void start( SceneManager *sceneManager ); }; // -----[ SceneManager.h ]----- // #include "Scene.h" #include "MenuScene.h" #include "GameScene.h" class Scene; class MenuScene; class GameScene; class SceneManager { public: Scene* scene; void changeScene( short id ) { if ( scene != NULL ) { delete scene; // to prevent a memory leak } if ( id == 0 ) { scene = new MenuScene(); } else if ( id == 1 ) { scene = new GameScene(); } if (scene) { scene-&gt;start( this ); } } }; // -----[ MenuScene.h ]----- // class MenuScene: public Scene { public: void start( SceneManager *sceneManager ) { this-&gt;sceneManager = sceneManager; } }; // -----[ GameScene.h ]----- // class GameScene: public Scene { public: void start( SceneManager *sceneManager ) { this-&gt;sceneManager = sceneManager; } }; </code></pre> <p>It doesn't work because of error (XCode 4.6, MacOS X):</p> <pre><code>Apple Match-O Linker (id) Error Undefined symbols for architecture x86_64: "Scene::start(SceneManager*)", referenced from: SceneManager::changeScene(short) in main.o ld: symbol(s) not found for architecture x86_64 </code></pre> <p>What do i do wrong? How to fix it? Maybe someone knows about some popular issues on this subject?</p>
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    1. CONot entirely sure what you're asking but it's common to have a base class and inherit each scene class from it.
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    2. COYes, you're right. I don't know how can I call a function from the parent class. Do I need to create child classes based on the base class? Do I need forward declaration here or I can do without it? I can't imagine how to design this scheme without a forward declaration.
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    3. COI've updated my question.
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