Standard library header <any> (C++17)

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros(C++20)

Language support library

Concepts library(C++20)

Diagnostics library

Memory management library

Metaprogramming library(C++11)

General utilities library

Containers library

Iterators library

Ranges library(C++20)

Algorithms library

Strings library

Text processing library

Numerics library

Date and time library

Input/output library

Filesystem library(C++17)

Concurrency support library(C++11)

Execution control library(C++26)

Technical specifications

Symbols index

External libraries

 

Standard library headers

Language support <cfloat> <climits> <compare>(C++20) <contracts>(C++26) <coroutine>(C++20) <csetjmp> <csignal> <cstdarg> <cstddef> <cstdint>(C++11) <cstdlib> <exception> <initializer_list>(C++11)    <limits> <new> <source_location>(C++20) <stdfloat>(C++23) <typeinfo> <version>(C++20) Concepts <concepts>(C++20) Diagnostics <cassert> <cerrno> <debugging>(C++26) <stacktrace>(C++23) <stdexcept> <system_error>(C++11) Memory management <memory> <memory_resource>(C++17) <scoped_allocator>(C++11) Metaprogramming <type_traits>(C++11) <ratio>(C++11)

General utilities <any>(C++17) <bitset> <bit>(C++20) <charconv>(C++17) <expected>(C++23) <format>(C++20) <functional> <optional>(C++17) <stdbit.h>(C++26) <tuple>(C++11) <typeindex>(C++11) <utility> <variant>(C++17) Containers <array>(C++11) <deque> <flat_map>(C++23) <flat_set>(C++23) <forward_list>(C++11) <hive>(C++26) <inplace_vector>(C++26)    <list> <map> <mdspan>(C++23) <queue> <set> <span>(C++20) <stack> <unordered_map>(C++11) <unordered_set>(C++11) <vector> Iterators <iterator> Ranges <generator>(C++23) <ranges>(C++20)

Algorithms <algorithm> <numeric> Strings <cctype> <cstring> <cuchar>(C++11) <cwchar> <cwctype> <string_view>(C++17) <string> Text processing <clocale> <codecvt>(C++11/17/26*) <locale> <regex>(C++11) <text_encoding>(C++26)    Numerics <cfenv>(C++11) <cmath> <complex> <linalg>(C++26) <numbers>(C++20) <random>(C++11) <simd>(C++26) <stdckdint.h>(C++26) <valarray> Time <chrono>(C++11) <ctime> C compatibility <ccomplex>(C++11/17/20*) <ciso646>(until C++20) <cstdalign>(C++11/17/20*) <cstdbool>(C++11/17/20*) <ctgmath>(C++11/17/20*)

Input/output <cinttypes>(C++11) <cstdio> <filesystem>(C++17) <fstream> <iomanip> <iosfwd> <iostream> <ios> <istream> <ostream> <print>(C++23) <spanstream>(C++23) <sstream> <streambuf> <strstream>(C++98/26*) <syncstream>(C++20) Concurrency support <atomic>(C++11) <barrier>(C++20) <condition_variable>(C++11) <future>(C++11) <hazard_pointer>(C++26) <latch>(C++20) <mutex>(C++11) <rcu>(C++26) <semaphore>(C++20) <shared_mutex>(C++14) <stdatomic.h>(C++23) <stop_token>(C++20) <thread>(C++11) Execution support <execution>(C++17)

 

This header is part of the general utility library.

Classes
any (C++17)	objects that hold instances of any CopyConstructible type (class)
bad_any_cast (C++17)	exception thrown by the value-returning forms of any_cast on a type mismatch (class)
Functions
std::swap(std::any) (C++17)	specializes the std::swap algorithm (function)
make_any (C++17)	creates an any object (function template)
any_cast (C++17)	type-safe access to the contained object (function template)

Synopsis

namespace std {// class bad_any_castclass bad_any_cast;   // class anyclass any;   // non-member functionsvoid swap(any& x, any& y)noexcept;   template<class T, class... Args> any make_any(Args&&... args);template<class T, class U, class... Args> any make_any(initializer_list<U> il, Args&&... args);   template<class T> T any_cast(const any& operand);template<class T> T any_cast(any& operand);template<class T> T any_cast(any&& operand);   template<class T>const T* any_cast(const any* operand)noexcept;template<class T> T* any_cast(any* operand)noexcept;}

Class std::bad_any_cast

namespace std {class bad_any_cast :public bad_cast {public:// see [exception] for the specification of the special member functionsconstchar* what()constnoexcept override;};}

Class std::any

namespace std {class any {public:// construction and destructionconstexpr 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();   // assignments any& operator=(const any& rhs); any& operator=(any&& rhs)noexcept;   template<class T> any& operator=(T&& rhs);   // modifierstemplate<class T, class... Args> decay_t<T>& emplace(Args&&...);template<class T, class U, class... Args> decay_t<T>& emplace(initializer_list<U>, Args&&...);void reset()noexcept;void swap(any& rhs)noexcept;   // observersbool has_value()constnoexcept;const type_info& type()constnoexcept;};}