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- #include <iostream>
- using namespace std;
- class Singleton
- {
- private:
- Singleton() {};
- Singleton(Singleton& ) = delete;
- Singleton operator=(Singleton&) = delete;
- public:
- static Singleton * instance;
- static Singleton * getInstance();
- void foo() { cout << "test object" << endl;}
- };
- Singleton * Singleton::instance = nullptr;
- //Singleton * getInstance()
- Singleton * Singleton::getInstance()
- {
- if (Singleton::instance == nullptr)
- {
- Singleton::instance = new Singleton();
- }
- return Singleton::instance;
- }
- int main()
- {
- // Singleton * s = new Singleton(); // error
- Singleton* ss = Singleton::getInstance();
- Singleton* aa = Singleton::getInstance();
- cout << ss << endl;
- cout << aa << endl;
- return 0;
- }
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