1 // from the header file
2 class Singleton {
3 public:
4 static Singleton* instance();
5 ...
6 private:
7 static Singleton* pInstance;
8 };
9
10 // from the implementation file
11 Singleton* Singleton::pInstance = 0;
12
13 Singleton* Singleton::instance() {
14 if (pInstance == 0) {
15 pInstance = new Singleton;
16 }
17 return pInstance;
18 }