Standard library header <tuple> (C++11)
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Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Standard library headers
<compare> (C++20)
<contracts> (C++26)
<coroutine> (C++20)
<cstdint> (C++11)
<source_location> (C++20)
<stdfloat> (C++23)
<version> (C++20)
<concepts> (C++20)
<debugging> (C++26)
<stacktrace> (C++23)
<system_error> (C++11)
<memory_resource> (C++17)
<scoped_allocator> (C++11)
<type_traits> (C++11)
<ratio> (C++11)
<any> (C++17)
<bit> (C++20)
<charconv> (C++17)
<expected> (C++23)
<format> (C++20)
<optional> (C++17)
<stdbit.h> (C++26)
<tuple> (C++11)
<typeindex> (C++11)
<variant> (C++17)
<array> (C++11)
<flat_map> (C++23)
<flat_set> (C++23)
<forward_list> (C++11)
<hive> (C++26)
<mdspan> (C++23)
<span> (C++20)
<unordered_map> (C++11)
<unordered_set> (C++11)
<generator> (C++23)
<ranges> (C++20)
<cuchar> (C++11)
<string_view> (C++17)
<codecvt> (C++11/17/26*)
<regex> (C++11)
<cfenv> (C++11)
<linalg> (C++26)
<numbers> (C++20)
<random> (C++11)
<simd> (C++26)
<stdckdint.h> (C++26)
<chrono> (C++11)
<ccomplex> (C++11/17/20*)
<ciso646> (until C++20)
<cstdalign> (C++11/17/20*)
<cstdbool> (C++11/17/20*)
<ctgmath> (C++11/17/20*)
<cinttypes> (C++11)
<filesystem> (C++17)
<print> (C++23)
<spanstream> (C++23)
<strstream> (C++98/26*)
<syncstream> (C++20)
<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> (C++17)
This header is part of the general utility library.
Includes
Classes
(C++11)
(class template) [edit]
(C++11)
a tuple
(class template specialization) [edit]
Constants
Functions
(C++11)
(function template) [edit]
(removed in C++20)(removed in C++20)(removed in C++20)(removed in C++20)(removed in C++20)(C++20)
(function template) [edit]
[edit] Synopsis
#include <compare> namespace std { // class template tuple template<class... Types> class tuple; // tuple creation functions inline constexpr /* unspecified */ ignore; template<class... TTypes> constexpr tuple<unwrap_ref_decay_t<TTypes>...> make_tuple(TTypes&&...); template<class... TTypes> constexpr tuple<TTypes&&...> forward_as_tuple(TTypes&&...) noexcept; template<class... TTypes> constexpr tuple<TTypes&...> tie(TTypes&...) noexcept; template<class... Tuples> constexpr tuple<CTypes...> tuple_cat(Tuples&&...); // calling a function with a tuple of arguments template<class F, class Tuple> constexpr decltype(auto) apply(F&& f, Tuple&& t); template<class T, class Tuple> constexpr T make_from_tuple(Tuple&& t); // tuple helper classes template<class T> struct tuple_size; // not defined template<class T> struct tuple_size<const T>; template<class... Types> struct tuple_size<tuple<Types...>>; template<size_t I, class T> struct tuple_element; // not defined template<size_t I, class T> struct tuple_element<I, const T>; template<size_t I, class... Types> struct tuple_element<I, tuple<Types...>>; template<size_t I, class T> using tuple_element_t = typename tuple_element<I, T>::type; // element access template<size_t I, class... Types> constexpr tuple_element_t<I, tuple<Types...>>& get(tuple<Types...>&) noexcept; template<size_t I, class... Types> constexpr tuple_element_t<I, tuple<Types...>>&& get(tuple<Types...>&&) noexcept; template<size_t I, class... Types> constexpr const tuple_element_t<I, tuple<Types...>>& get(const tuple<Types...>&) noexcept; template<size_t I, class... Types> constexpr const tuple_element_t<I, tuple<Types...>>&& get(const tuple<Types...>&&) noexcept; template<class T, class... Types> constexpr T& get(tuple<Types...>& t) noexcept; template<class T, class... Types> constexpr T&& get(tuple<Types...>&& t) noexcept; template<class T, class... Types> constexpr const T& get(const tuple<Types...>& t) noexcept; template<class T, class... Types> constexpr const T&& get(const tuple<Types...>&& t) noexcept; // relational operators template<class... TTypes, class... UTypes> constexpr bool operator==(const tuple<TTypes...>&, const tuple<UTypes...>&); template<class... TTypes, class... UTypes> constexpr common_comparison_category_t</*synth-three-way-result*/<TTypes, UTypes>...> operator<=>(const tuple<TTypes...>&, const tuple<UTypes...>&); // allocator-related traits template<class... Types, class Alloc> struct uses_allocator<tuple<Types...>, Alloc>; // specialized algorithms template<class... Types> constexpr void swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(/* see description */); // tuple helper classes template<class T> inline constexpr size_t tuple_size_v = tuple_size<T>::value; } // deprecated namespace std { template<class T> class tuple_size<volatile T>; template<class T> class tuple_size<const volatile T>; template<size_t I, class T> class tuple_element<I, volatile T>; template<size_t I, class T> class tuple_element<I, const volatile T>; }
[edit] Class template std::tuple
namespace std { template<class... Types> class tuple { public: // tuple construction constexpr explicit(/* see description */) tuple(); constexpr explicit(/* see description */) tuple(const Types&...); // only if sizeof...(Types) >= 1 template<class... UTypes> constexpr explicit(/* see description */) tuple(UTypes&&...); // only if sizeof...(Types) >= 1 tuple(const tuple&) = default; tuple(tuple&&) = default; template<class... UTypes> constexpr explicit(/* see description */) tuple(const tuple<UTypes...>&); template<class... UTypes> constexpr explicit(/* see description */) tuple(tuple<UTypes...>&&); template<class U1, class U2> constexpr explicit(/* see description */) tuple(const pair<U1, U2>&); // only if sizeof...(Types) == 2 template<class U1, class U2> constexpr explicit(/* see description */) tuple(pair<U1, U2>&&); // only if sizeof...(Types) == 2 // allocator-extended constructors template<class Alloc> constexpr explicit(/* see description */) tuple(allocator_arg_t, const Alloc& a); template<class Alloc> constexpr explicit(/* see description */) tuple(allocator_arg_t, const Alloc& a, const Types&...); template<class Alloc, class... UTypes> constexpr explicit(/* see description */) tuple(allocator_arg_t, const Alloc& a, UTypes&&...); template<class Alloc> constexpr tuple(allocator_arg_t, const Alloc& a, const tuple&); template<class Alloc> constexpr tuple(allocator_arg_t, const Alloc& a, tuple&&); template<class Alloc, class... UTypes> constexpr explicit(/* see description */) tuple(allocator_arg_t, const Alloc& a, const tuple<UTypes...>&); template<class Alloc, class... UTypes> constexpr explicit(/* see description */) tuple(allocator_arg_t, const Alloc& a, tuple<UTypes...>&&); template<class Alloc, class U1, class U2> constexpr explicit(/* see description */) tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&); template<class Alloc, class U1, class U2> constexpr explicit(/* see description */) tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&&); // tuple assignment constexpr tuple& operator=(const tuple&); constexpr tuple& operator=(tuple&&) noexcept(/* see description */); template<class... UTypes> constexpr tuple& operator=(const tuple<UTypes...>&); template<class... UTypes> constexpr tuple& operator=(tuple<UTypes...>&&); template<class U1, class U2> constexpr tuple& operator=(const pair<U1, U2>&); // only if sizeof...(Types) == 2 template<class U1, class U2> constexpr tuple& operator=(pair<U1, U2>&&); // only if sizeof...(Types) == 2 // tuple swap constexpr void swap(tuple&) noexcept(/* see description */); }; template<class... UTypes> tuple(UTypes...) -> tuple<UTypes...>; template<class T1, class T2> tuple(pair<T1, T2>) -> tuple<T1, T2>; template<class Alloc, class... UTypes> tuple(allocator_arg_t, Alloc, UTypes...) -> tuple<UTypes...>; template<class Alloc, class T1, class T2> tuple(allocator_arg_t, Alloc, pair<T1, T2>) -> tuple<T1, T2>; template<class Alloc, class... UTypes> tuple(allocator_arg_t, Alloc, tuple<UTypes...>) -> tuple<UTypes...>; }