any class

An any object either stores an instance of a type that satisfies the constructor requirements, or it has no value. Whether it has a stored instance, or no value, is called the state of the any object.

The stored instance is called the contained value. Two any objects have the same state if either they both have no value, or both have a contained value and those values are the same.

Syntax

class any;

Members

Constructors

Functions

Operators

any

Constructs an object of type any. Also includes a destructor.

constexpr any() noexcept;
any(const any& other);
any(any&& other) noexcept;
template <class T>
    any(T&& value);
template <class T, class... Args>
    explicit any(in_place_type_t<T>, Args&&...);
template <class T, class U, class... Args>
    explicit any(in_place_type_t<T>, initializer_list<U>, Args&&...);

~any();

emplace

Sets an any value.

template <class T, class... Args>
    decay_t<T>& emplace(Args&& ...);
template <class T, class U, class... Args>
    decay_t<T>& emplace(initializer_list<U>, Args&&...);

has_value

Returns true if the any object has a value.

bool has_value() const noexcept;

operator=

Replaces the any content with a copy of another any.

any& operator=(const any& right);
any& operator=(any&& right) noexcept;
template <class T>
    any& operator=(T&& right);

Parameters

right
The any being copied into this any.

reset

Resets an any.

void reset() noexcept;

swap

Exchanges two any objects.

void swap(any& rhs) noexcept;

type

Returns the any type.

const type_info& type() const noexcept;

Requirements

Header: <any>

Namespace: std

Standard: C++17 (Use at least /std:c++17 to compile.)

See also

<any>
any_cast
make_any
swap
bad_any_cast