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Util: Add singleton class

master
Riyyi 3 years ago
parent
commit
eaec2c0e7a
  1. 50
      src/util/singleton.h

50
src/util/singleton.h

@ -0,0 +1,50 @@
#ifndef SINGLETON_H
#define SINGLETON_H
#include <cassert>
namespace Util {
template<typename T>
class Singleton {
public:
static inline T& the()
{
if (s_instance == nullptr) {
s_instance = new T { s {} };
}
return *s_instance;
}
static inline void destroy()
{
if (s_instance) {
delete s_instance;
}
s_instance = nullptr;
}
// Remove copy constructor and copy assignment operator
Singleton(const Singleton&) = delete;
Singleton& operator=(const Singleton&) = delete;
Singleton(Singleton&&) = delete;
Singleton& operator=(Singleton&&) = delete;
protected:
Singleton() {}
// Constructor token
struct s {};
private:
static T* s_instance;
};
template<typename T>
T* Singleton<T>::s_instance = nullptr;
} // namespace Util
#endif // SINGLETON_H
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