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POSingleton in cocos2d-x Android
 

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    <p>I'm trying to write a singleton class for maintain game data, It's called GameManager, just like the book "Learning cocos2d" produced.</p> <h2>here is my .h file:</h2> <pre><code>#ifndef GameManager_h #define GameManager_h #include "cocos2d.h" class GameManager { private: //Constructor GameManager(); //Instance of the singleton static GameManager* m_mySingleton; public: //Get instance of singleton static GameManager* sharedGameManager(); //A function that returns zero "0" int ReturnZero(){return 0;} // another test function void runScene() { CCLOG("test");}; }; </code></pre> <h2>and here is my .cpp file:</h2> <pre><code>#include "SimpleAudioEngine.h" #include "GameManager.h" using namespace cocos2d; using namespace CocosDenshion; //All static variables need to be defined in the .cpp file //I've added this following line to fix the problem GameManager* GameManager::m_mySingleton = NULL; GameManager::GameManager() { } GameManager* GameManager::sharedGameManager() { //If the singleton has no instance yet, create one if(NULL == m_mySingleton) { //Create an instance to the singleton m_mySingleton = new GameManager(); } //Return the singleton object return m_mySingleton; } </code></pre> <h2>Here is the call in HelloWorld.cpp:</h2> <pre><code>void HelloWorld::ccTouchesEnded(CCSet* touches, CCEvent* event) { CCLOG("return zero:%d",GameManager::sharedGameManager()-&gt;ReturnZero()); // Line 231 GameManager::sharedGameManager()-&gt;runScene(); // Line 232 } </code></pre> <h2>Here is the weird problem, It's worked fine with xcode, can build on iPhone. but when i try to build with ndk:</h2> <pre><code>./obj/local/armeabi/objs-debug/game_logic/HelloWorldScene.o: In function `HelloWorld::ccTouchesEnded(cocos2d::CCSet*, cocos2d::CCEvent*)': /Users/abc/Documents/def/def/android/jni/../../Classes/HelloWorldScene.cpp:232: undefined reference to `GameManager::sharedGameManager()' collect2: ld returned 1 exit status make: *** [obj/local/armeabi/libgame_logic.so] Error 1 </code></pre> <p>If undefined reference to `GameManager::sharedGameManager()', why the hell the first call is working?</p> <p>Any help will do, thanks!</p>
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