optional.hpp File Reference

#include <exception>
#include <initializer_list>
#include <memory>
#include <new>
#include <concepts/concepts.hpp>
#include <range/v3/detail/config.hpp>
#include <range/v3/utility/addressof.hpp>
#include <range/v3/utility/in_place.hpp>
#include <range/v3/utility/static_const.hpp>
#include <range/v3/utility/swap.hpp>
#include <range/v3/detail/prologue.hpp>
#include <range/v3/detail/epilogue.hpp>

Go to the source code of this file.

Classes
struct	ranges::bad_optional_access
struct	ranges::nullopt_t
struct	ranges::nullopt_t::tag
struct	ranges::optional< T >

Concepts
concept	ranges::optional_should_convert
	The optional_should_convert concept.
concept	ranges::optional_should_convert_assign
	The optional_should_convert_assign concept.

Variables
constexpr nullopt_t	ranges::nullopt {nullopt_t::tag{}}
template<typename U , typename T >
CPP_concept	ranges::optional_should_convert
template<typename U , typename T >
CPP_concept	ranges::optional_should_convert_assign

Variable Documentation

optional_should_convert

template<typename U , typename T >

CPP_concept ranges::optional_should_convert

Initial value:

=
        !(
            constructible_from<T, optional<U> &       > ||
            constructible_from<T, optional<U> &&      > ||
            constructible_from<T, optional<U> const & > ||
            constructible_from<T, optional<U> const &&> ||
            convertible_to<optional<U> &,        T> ||
            convertible_to<optional<U> &&,       T> ||
            convertible_to<optional<U> const &,  T> ||
            convertible_to<optional<U> const &&, T>
        )

optional_should_convert_assign

template<typename U , typename T >

CPP_concept ranges::optional_should_convert_assign

Initial value:

=
        optional_should_convert<U, T> &&
        !(assignable_from<T &, optional<U> &> ||
        assignable_from<T &, optional<U> &&> ||
        assignable_from<T &, optional<U> const &> ||
        assignable_from<T &, optional<U> const &&>)