caf::variant< Ts > Class Template Reference

A variant represents always a valid value of one of the types Ts.... More...

#include <variant.hpp>

Public Types
using	types = detail::type_list<Ts...>
using	type0 = typename detail::tl_at<types, 0>::type

Public Member Functions
template<class U>
	variant (U &&arg) noexcept(std::is_rvalue_reference< U && >::value &&nothrow_move_assign)
	variant (variant &&other) noexcept(nothrow_move_construct)
	variant (const variant &other)
variant &	operator= (const variant &other)
variant &	operator= (variant &&other) noexcept(nothrow_move_assign)
template<class U>
variant &	operator= (U &&arg) noexcept(nothrow_move_assign)
constexpr size_t	index () const
bool	valueless_by_exception () const

Static Public Attributes
static constexpr int	max_type_id = sizeof...(Ts) - 1
	Stores the ID for the last type.
static constexpr bool	nothrow_move_construct
	Stores whether all types are nothrow constructible.
static constexpr bool	nothrow_move_assign
	Stores whether all types are nothrow assignable and constructible.

Related Symbols
(Note that these are not member symbols.)
template<class... Ts>
bool	operator== (const variant< Ts... > &x, const variant< Ts... > &y)
template<class... Ts>
bool	operator!= (const variant< Ts... > &x, const variant< Ts... > &y)
template<class... Ts>
bool	operator< (const variant< Ts... > &x, const variant< Ts... > &y)
template<class... Ts>
bool	operator> (const variant< Ts... > &x, const variant< Ts... > &y)
template<class... Ts>
bool	operator<= (const variant< Ts... > &x, const variant< Ts... > &y)
template<class... Ts>
bool	operator>= (const variant< Ts... > &x, const variant< Ts... > &y)
template<class Inspector, class... Ts>
Inspector::result_type	inspect (Inspector &f, variant_reader< variant< Ts... > > &x)
template<class Inspector, class... Ts>
std::enable_if< Inspector::reads_state, typenameInspector::result_type >::type	inspect (Inspector &f, variant< Ts... > &x)
template<class Inspector, class... Ts>
Inspector::result_type	inspect (Inspector &f, variant_writer< variant< Ts... > > &x)
template<class Inspector, class... Ts>
std::enable_if< Inspector::writes_state, typenameInspector::result_type >::type	inspect (Inspector &f, variant< Ts... > &x)

Detailed Description

template<class... Ts>
class caf::variant< Ts >

A variant represents always a valid value of one of the types Ts....

Member Data Documentation

nothrow_move_assign

template<class... Ts>

bool caf::variant< Ts >::nothrow_move_assign

staticconstexpr

Initial value:

=
    nothrow_move_construct
    && detail::conjunction<
         std::is_nothrow_move_assignable<Ts>::value...
       >::value

Stores whether all types are nothrow assignable and constructible.

We need to check both, since assigning to a variant results in a move-contruct unless the before and after types are the same.

nothrow_move_construct

template<class... Ts>

bool caf::variant< Ts >::nothrow_move_construct

staticconstexpr

Initial value:

=
    detail::conjunction<
      std::is_nothrow_move_constructible<Ts>::value...
    >::value

Stores whether all types are nothrow constructible.

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The documentation for this class was generated from the following files:

• /build/actor-framework-Z9pIPl/actor-framework-0.17.6/libcaf_core/caf/fwd.hpp
• /build/actor-framework-Z9pIPl/actor-framework-0.17.6/libcaf_core/caf/variant.hpp