libstdc++
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Public Types | |
using | value_type = _Tp |
Public Member Functions | |
template<typename _Up = _Tp, enable_if_t< __and_< __not_< is_same< optional< _Tp >, decay_t< _Up >>>, is_constructible< _Tp, _Up && >, is_convertible< _Up &&, _Tp > >::value, bool > = true> | |
constexpr | optional (_Up &&__t) |
template<typename _Up = _Tp, enable_if_t< __and_< __not_< is_same< optional< _Tp >, decay_t< _Up >>>, is_constructible< _Tp, _Up && >, __not_< is_convertible< _Up &&, _Tp >> >::value, bool > = false> | |
constexpr | optional (_Up &&__t) |
template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, is_constructible< _Tp, const _Up & >, is_convertible< const _Up &, _Tp >, __not_< __converts_from_optional< _Tp, _Up >> >::value, bool > = true> | |
constexpr | optional (const optional< _Up > &__t) |
template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, is_constructible< _Tp, const _Up & >, __not_< is_convertible< const _Up &, _Tp >>, __not_< __converts_from_optional< _Tp, _Up >> >::value, bool > = false> | |
constexpr | optional (const optional< _Up > &__t) |
template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, is_constructible< _Tp, _Up && >, is_convertible< _Up &&, _Tp >, __not_< __converts_from_optional< _Tp, _Up >> >::value, bool > = true> | |
constexpr | optional (optional< _Up > &&__t) |
template<typename _Up , enable_if_t< __and_< __not_< is_same< _Tp, _Up >>, is_constructible< _Tp, _Up && >, __not_< is_convertible< _Up &&, _Tp >>, __not_< __converts_from_optional< _Tp, _Up >> >::value, bool > = false> | |
constexpr | optional (optional< _Up > &&__t) |
template<typename... _Args> | |
enable_if_t< is_constructible < _Tp, _Args &&...>::value > | emplace (_Args &&...__args) |
template<typename _Up , typename... _Args> | |
enable_if_t< is_constructible < _Tp, initializer_list< _Up > &, _Args &&...>::value > | emplace (initializer_list< _Up > __il, _Args &&...__args) |
if (this->_M_is_engaged()&&__other._M_is_engaged()) swap(this-> _M_get(), __other._M_get()) | |
else | if (this->_M_is_engaged()) |
else | if (__other._M_is_engaged()) |
constexpr | operator bool () const noexcept |
constexpr const _Tp & | operator* () const & |
constexpr _Tp & | operator* ()& |
constexpr _Tp && | operator* ()&& |
constexpr const _Tp && | operator* () const && |
constexpr const _Tp * | operator-> () const |
_Tp * | operator-> () |
optional & | operator= (nullopt_t) noexcept |
template<typename _Up = _Tp> | |
enable_if_t< __and_< __not_ < is_same< optional< _Tp > , decay_t< _Up > > >, is_constructible< _Tp, _Up >, __not_< __and_ < is_scalar< _Tp >, is_same < _Tp, decay_t< _Up > > > >, is_assignable< _Tp &, _Up > >::value, optional & > | operator= (_Up &&__u) |
template<typename _Up > | |
enable_if_t< __and_< __not_ < is_same< _Tp, _Up > >, is_constructible< _Tp, const _Up & >, is_assignable < _Tp &, _Up >, __not_ < __converts_from_optional < _Tp, _Up > >, __not_ < __assigns_from_optional< _Tp, _Up > > >::value, optional & > | operator= (const optional< _Up > &__u) |
template<typename _Up > | |
enable_if_t< __and_< __not_ < is_same< _Tp, _Up > >, is_constructible< _Tp, _Up > , is_assignable< _Tp &, _Up > , __not_ < __converts_from_optional < _Tp, _Up > >, __not_ < __assigns_from_optional< _Tp, _Up > > >::value, optional & > | operator= (optional< _Up > &&__u) |
constexpr const _Tp & | value () const & |
constexpr _Tp & | value ()& |
constexpr _Tp && | value ()&& |
constexpr const _Tp && | value () const && |
template<typename _Up > | |
constexpr _Tp | value_or (_Up &&__u) const & |
template<typename _Up > | |
_Tp | value_or (_Up &&__u)&& |
Class template for optional values.
Definition at line 70 of file experimental/optional.