#ifndef __NE_KIT_NULLABLE_H__
#define __NE_KIT_NULLABLE_H__

#include <NeKit/Config.h>

namespace Kernel {
template <class Type>
struct IsDefined final {
  using ResultType    = Type;
  using ResultTypeRef = Type&;

  static constexpr bool kValue = true;
};

template <>
struct IsDefined<nullPtr> final {
  static constexpr bool kValue = false;
};

template <class Type>
concept IsAcceptable = requires() {
  { IsDefined<Type>::kValue };
};
}  // namespace Kernel

#endif  // !__NE_KIT_NULLABLE_H__