protected_member.hpp

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#ifndef EAGINE_PROTECTED_MEMBER_HPP
#define EAGINE_PROTECTED_MEMBER_HPP
 
#include "type_identity.hpp"
#include <utility>
 
namespace eagine {
 
template <typename T, typename Selector = type_identity<T>>
class protected_member {
public:
    auto get_the_member(Selector = Selector()) noexcept -> T& {
        return _member;
    }
 
    auto get_the_member(Selector = Selector()) const noexcept -> const T& {
        return _member;
    }
 
protected:
    template <typename... P>
    protected_member(P&&... p)
      : _member(std::forward<P>(p)...) {}
 
private:
    T _member;
};
 
template <typename Selector, typename T>
static inline auto get_member(
  protected_member<T, Selector>& pm,
  Selector selector = Selector()) noexcept -> T& {
    return pm.get_the_member(selector);
}
 
template <typename Selector, typename T>
static inline auto get_member(
  const protected_member<T, Selector>& pm,
  Selector selector = Selector()) noexcept -> const T& {
    return pm.get_the_member(selector);
}
 
} // namespace eagine
 
#endif // EAGINE_PROTECTED_MEMBER_HPP