I’m trying to write a singleton class for maintain game data, It’s called GameManager, just like the book .
here is my .h file:
——————————-
#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");};
};
and here is my .cpp file:
—————————
#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;
}
Here is the call in HelloWorld.cpp:
———————
void HelloWorld::ccTouchesEnded(CCSet* touches, CCEvent* event) {
CCLOG("return zero:%d",GameManager::sharedGameManager()->ReturnZero()); // Line 231
GameManager::sharedGameManager()->runScene(); // Line 232
}
Here is the weird problem, It’s worked fine with xcode, can build on iPhone. but when i try to build with ndk:
———————
./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
If undefined reference to `GameManager::sharedGameManager()’, why the hell the first call is working?
Any help will do, thanks!