std::any - Man Page

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>, enable_if_t< is_copy_constructible< _VTp >::value &&!__is_in_place_type< _VTp >::value, 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.

Static Public Member Functions

template<typename _Tp > static constexpr bool __is_valid_cast ()

Friends

template<typename _Tp > void * __any_caster (const any *__any)

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.

Definition at line 77 of file any.

Author

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Info

Wed Feb 10 2021 libstdc++