Created
June 22, 2019 06:16
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Simple C++ singleton
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| #include <iostream> | |
| using namespace std; | |
| class Singleton { | |
| public: | |
| static Singleton& instance(); | |
| int increment() { return ++x; } | |
| private: | |
| Singleton() = default; | |
| Singleton(const Singleton&) = delete; | |
| int x = 0; | |
| }; | |
| Singleton& Singleton::instance() | |
| { | |
| static Singleton singleton; | |
| return singleton; | |
| } | |
| int main() | |
| { | |
| cout << Singleton::instance().increment() << endl; // 1 | |
| cout << Singleton::instance().increment() << endl; // 2 | |
| cout << Singleton::instance().increment() << endl; // 3 | |
| cout << Singleton::instance().increment() << endl; // 4 | |
| cout << Singleton::instance().increment() << endl; // 5 | |
| return 0; | |
| } |
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