43 lines
903 B
C++
43 lines
903 B
C++
#include <cstdlib>
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#include <iomanip>
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#include <iostream>
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#include <mutex>
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class Singleton {
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private:
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static Singleton *singleton;
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static std::mutex mutex;
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Singleton() = default;
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public:
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Singleton(const Singleton &other) = delete;
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Singleton &operator=(const Singleton &) = delete;
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static Singleton *GetInstance() {
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std::lock_guard<std::mutex> lock(mutex);
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if (singleton == nullptr) {
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singleton = new Singleton();
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}
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return singleton;
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}
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};
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Singleton *Singleton::singleton = nullptr;
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std::mutex Singleton::mutex;
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int main(int argc, char *argv[]) {
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std::cout << "Singleton" << std::endl;
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auto singleton1 = Singleton::GetInstance();
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auto singleton2 = Singleton::GetInstance();
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std::cout << std::setw(20) << "Singleton 1: " << singleton1 << std::endl;
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std::cout << std::setw(20) << "Singleton 2: " << singleton2 << std::endl;
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return EXIT_SUCCESS;
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}
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