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>, 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
           C++17

       Definition at line 80 of file any.

Constructor & Destructor Documentation

   constexpr std::any::any () [inline],  [constexpr],  [noexcept]
       Default constructor, creates an empty object.

       Definition at line 153 of file any.

       Referenced by operator=().

   std::any::any (const any & __other) [inline]
       Copy constructor, copies the state of __other.

       Definition at line 156 of file any.

       References has_value().

   std::any::any (any && __other) [inline],  [noexcept]
       Move constructor, transfer the state from __other.

       Postcondition
           !__other.has_value() (this postcondition is a GNU extension)

       Definition at line 173 of file any.

   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.

       Definition at line 190 of file any.

   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.

       Definition at line 201 of file any.

   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.

       Definition at line 214 of file any.

   std::any::~any () [inline]
       Destructor, calls reset()

       Definition at line 221 of file any.

       References 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.

       Definition at line 265 of file any.

   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.

       Definition at line 276 of file any.

   bool std::any::has_value () const [inline],  [noexcept]
       Reports whether there is a contained object or not.

       Definition at line 328 of file any.

       Referenced by any(), reset(), swap(), 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.

       Definition at line 256 of file any.

       References any().

   any & std::any::operator= (any && __rhs) [inline],  [noexcept]
       Move assignment operator.

       Postcondition
           !__rhs.has_value() (not guaranteed for other implementations)

       Definition at line 239 of file any.

       References reset().

   any & std::any::operator= (const any & __rhs) [inline]
       Copy the state of another object.

       Definition at line 227 of file any.

       References any().

   void std::any::reset () [inline],  [noexcept]
       If not empty, destroy the contained object.

       Definition at line 286 of file any.

       References has_value().

       Referenced by ~any(), and operator=().

   void std::any::swap (any & __rhs) [inline],  [noexcept]
       Exchange state with another object.

       Definition at line 296 of file any.

       References has_value().

   const type_info & std::any::type () const [inline],  [noexcept]
       The typeid of the contained object, or typeid(void) if empty.

       Definition at line 332 of file any.

       References has_value().

Author

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