std::any(3) | Library Functions Manual | std::any(3) |
NAME
std::any - A type-safe container of any type.
SYNOPSIS
#include <any>
Public Member Functions
constexpr any () noexcept
Default constructor, creates an empty object. template<typename _Tp
, typename _VTp = _Decay_if_not_any<_Tp>,
typename _Mgr = _Manager<_VTp>, enable_if_t<
is_copy_constructible_v< _VTp >
&&!__is_in_place_type_v< _VTp >, bool > = true>
any (_Tp &&__value)
Construct with a copy of __value as the contained object. any
(any &&__other) noexcept
Move constructor, transfer the state from __other. any (const
any &__other)
Copy constructor, copies the state of __other. template<typename _Tp
, typename... _Args, typename _VTp = decay_t<_Tp>,
typename _Mgr = _Manager<_VTp>,
__any_constructible_t< _VTp, _Args &&... > =
false> any (in_place_type_t< _Tp >, _Args
&&... __args)
Construct with an object created from __args as the contained object.
template<typename _Tp , typename _Up , typename... _Args,
typename _VTp = decay_t<_Tp>, typename
_Mgr = _Manager<_VTp>, __any_constructible_t< _VTp,
initializer_list< _Up > &, _Args &&... >
= false> any (in_place_type_t< _Tp >,
initializer_list< _Up > __il, _Args &&...
__args)
Construct with an object created from __il and __args as the contained object.
~any ()
Destructor, calls reset() template<typename _Tp , typename...
_Args> __emplace_t< decay_t< _Tp >, _Args... >
emplace (_Args &&... __args)
Emplace with an object created from __args as the contained object.
template<typename _Tp , typename _Up , typename...
_Args> __emplace_t< decay_t< _Tp >,
initializer_list< _Up > &, _Args &&... >
emplace (initializer_list< _Up > __il,
_Args &&... __args)
Emplace with an object created from __il and __args as the contained object.
bool has_value () const noexcept
Reports whether there is a contained object or not.
template<typename _Tp > enable_if_t<
is_copy_constructible< _Decay_if_not_any< _Tp > >::value,
any & > operator= (_Tp &&__rhs)
Store a copy of __rhs as the contained object. any &
operator= (any &&__rhs) noexcept
Move assignment operator. any & operator= (const any
&__rhs)
Copy the state of another object. void reset () noexcept
If not empty, destroy the contained object. void swap
(any &__rhs) noexcept
Exchange state with another object. const type_info & type
() const noexcept
The typeid of the contained object, or typeid(void) if empty.
Detailed Description
A type-safe container of any type.
An any object's state is either empty or it stores a contained object of CopyConstructible type.
Since
Constructor & Destructor Documentation
constexpr std::any::any () [inline], [constexpr], [noexcept]
Default constructor, creates an empty object.
Referenced by operator=(), and operator=().
std::any::any (const any & __other) [inline]
Copy constructor, copies the state of __other.
std::any::any (any && __other) [inline], [noexcept]
Move constructor, transfer the state from __other.
Postcondition
References has_value().
template<typename _Tp , typename _VTp = _Decay_if_not_any<_Tp>, typename _Mgr = _Manager<_VTp>, enable_if_t< is_copy_constructible_v< _VTp > &&!__is_in_place_type_v< _VTp >, bool > = true> std::any::any (_Tp && __value) [inline]
Construct with a copy of __value as the contained object.
References std::forward().
template<typename _Tp , typename... _Args, typename _VTp = decay_t<_Tp>, typename _Mgr = _Manager<_VTp>, __any_constructible_t< _VTp, _Args &&... > = false> std::any::any (in_place_type_t< _Tp >, _Args &&... __args) [inline], [explicit]
Construct with an object created from __args as the contained object.
References std::forward().
template<typename _Tp , typename _Up , typename... _Args, typename _VTp = decay_t<_Tp>, typename _Mgr = _Manager<_VTp>, __any_constructible_t< _VTp, initializer_list< _Up > &, _Args &&... > = false> std::any::any (in_place_type_t< _Tp >, initializer_list< _Up > __il, _Args &&... __args) [inline], [explicit]
Construct with an object created from __il and __args as the contained object.
References std::forward().
std::any::~any () [inline]
Destructor, calls reset()
Member Function Documentation
template<typename _Tp , typename... _Args> __emplace_t< decay_t< _Tp >, _Args... > std::any::emplace (_Args &&... __args) [inline]
Emplace with an object created from __args as the contained object.
References std::forward().
template<typename _Tp , typename _Up , typename... _Args> __emplace_t< decay_t< _Tp >, initializer_list< _Up > &, _Args &&... > std::any::emplace (initializer_list< _Up > __il, _Args &&... __args) [inline]
Emplace with an object created from __il and __args as the contained object.
References std::forward().
bool std::any::has_value () const [inline], [noexcept]
Reports whether there is a contained object or not.
Referenced by any(), reset(), and type().
template<typename _Tp > enable_if_t< is_copy_constructible< _Decay_if_not_any< _Tp > >::value, any & > std::any::operator= (_Tp && __rhs) [inline]
Store a copy of __rhs as the contained object.
References any(), and std::forward().
any & std::any::operator= (any && __rhs) [inline], [noexcept]
Move assignment operator.
Postcondition
References std::forward(), and reset().
any & std::any::operator= (const any & __rhs) [inline]
Copy the state of another object.
References any(), and std::forward().
void std::any::reset () [inline], [noexcept]
If not empty, destroy the contained object.
References has_value().
Referenced by operator=().
void std::any::swap (any & __rhs) [inline], [noexcept]
Exchange state with another object.
const type_info & std::any::type () const [inline], [noexcept]
The typeid of the contained object, or typeid(void) if empty.
References std::forward(), and has_value().
Author
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