| Public Member Functions | |
| template<typename E > requires (!same_as<box, detail::decay_t<E>>) && constructible_from<Element, E> && convertible_to<E, Element> | |
| constexpr | box (E &&) noexcept | 
| template<typename E > requires (!same_as<box, detail::decay_t<E>>) && constructible_from<Element, E> && (!convertible_to<E, Element>) | |
| constexpr | box (E &&) noexcept | 
| constexpr Element && | get () &&noexcept | 
| constexpr Element & | get () &noexcept | 
| constexpr Element const && | get () const &&noexcept | 
| constexpr Element const & | get () const &noexcept |