Initial commit

src/common/singleton.h

@@ -0,0 +1,36 @@
+#ifndef KYTY_COMMON_SINGLETON_H_
+#define KYTY_COMMON_SINGLETON_H_
+
+#include <cstdlib>
+#include <new>
+
+namespace Common {
+
+template <class T>
+class Singleton {
+public:
+	static T* Instance() {
+		if (!g_m_instance) {
+			// NOLINTNEXTLINE(cppcoreguidelines-no-malloc,hicpp-no-malloc)
+			g_m_instance = static_cast<T*>(std::malloc(sizeof(T)));
+			new (g_m_instance) T;
+		}
+
+		return g_m_instance;
+	}
+
+	KYTY_CLASS_NO_COPY(Singleton);
+
+protected:
+	Singleton();
+	~Singleton();
+
+private:
+	static inline T* g_m_instance = nullptr;
+};
+
+// template<class T> T* Singleton<T>::instance = 0;
+
+} // namespace Common
+
+#endif /* KYTY_COMMON_SINGLETON_H_ */