std::any(3cxx) std::any(3cxx)
NAME
std::any - A type-safe container of any type.
SYNOPSIS
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>, typename =
_Require<__not_<__is_in_place_type<_VTp>>,
is_copy_constructible<_VTp>>> 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
C++17
Constructor & Destructor Documentation
constexpr std::any::any () [inline], [constexpr], [noexcept]
Default constructor, creates an empty object.
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
!__other.has_value() (this postcondition is a GNU extension)
template<typename _Tp , typename _VTp = _Decay_if_not_any<_Tp>, typename
_Mgr = _Manager<_VTp>, typename =
_Require<__not_<__is_in_place_type<_VTp>>,
is_copy_constructible<_VTp>>> std::any::any (_Tp && __value) [inline]
Construct with a copy of __value as the contained object.
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.
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.
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.
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.
bool std::any::has_value () const [inline], [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&> std::any::operator= (_Tp && __rhs) [inline]
Store a copy of __rhs as the contained object.
any& std::any::operator= (any && __rhs) [inline], [noexcept]
Move assignment operator.
Postcondition
!__rhs.has_value() (not guaranteed for other implementations)
any& std::any::operator= (const any & __rhs) [inline]
Copy the state of another object.
void std::any::reset () [inline], [noexcept]
If not empty, destroy the contained object.
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.
Author
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libstdc++ Sat May 13 2023 std::any(3cxx)
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