SDL3pp_objParam.h

#ifndef SDL3PP_OBJ_PARAM_H_
#define SDL3PP_OBJ_PARAM_H_
 
#include <cstdlib>
 
namespace SDL {

template<typename RAW_POINTER>
class ObjParam
{
public:
  using RawPointer = RAW_POINTER;

  constexpr ObjParam(RawPointer resource)
    : m_resource(resource)
  {
  }

  constexpr ObjParam(std::nullptr_t = nullptr)
    : m_resource(nullptr)
  {
  }

  constexpr explicit operator bool() const { return !!m_resource; }

  constexpr auto operator<=>(const ObjParam& other) const = default;

  constexpr operator RawPointer() const { return m_resource; }

  constexpr auto operator->() const { return m_resource; }
 
private:
  RawPointer m_resource; 
};

template<typename RAW_POINTER, typename RAW_CONST_POINTER>
class ObjConstParam
{
public:
  using RawPointer = RAW_POINTER;
  using RawConstPointer = RAW_CONST_POINTER;

  constexpr ObjConstParam(RawConstPointer resource)
    : m_resource(resource)
  {
  }

  constexpr ObjConstParam(std::nullptr_t = nullptr)
    : m_resource(nullptr)
  {
  }

  constexpr explicit operator bool() const { return !!m_resource; }

  constexpr auto operator<=>(const ObjConstParam& other) const = default;

  constexpr operator RawConstPointer() const { return m_resource; }

  constexpr operator RawPointer() const
  {
    return const_cast<RawPointer>(m_resource);
  }

  constexpr auto operator->() const { return m_resource; }
 
private:
  RawConstPointer m_resource; 
};
 
} // namespace SDL
 
#endif /* SDL3PP_OBJ_PARAM_H_ */