Range-v3
Range algorithms, views, and actions for the Standard Library
optional.hpp File Reference

Classes

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

Variables

template<typename U , typename T >
concept ranges::optional_should_convert
 
template<typename U , typename T >
concept ranges::optional_should_convert_assign
 

Variable Documentation

◆ optional_should_convert

template<typename U , typename T >
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 >
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 &&>)