std::tuple_element<std::array>
From cppreference.com
C++
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)
Containers library
(C++17)
(C++11)
(C++26)
(C++26)
(C++11)
(C++11)
(C++11)
(C++11)
(C++11)
(C++23)
(C++23)
(C++23)
(C++23)
(C++20)
(C++23)
Tables
std::array
(until C++20)(until C++20)(until C++20)(until C++20)(until C++20)
tuple_element<std::array>
Deduction guides (C++17)
Defined in header
<array>
template< std::size_t I, class T, std::size_t N >
struct tuple_element< I, std::array <T, N> >;
(since C++11)
struct tuple_element< I, std::array <T, N> >;
Provides compile-time indexed access to the type of the elements of the array using tuple-like interface.
[edit] Member types
Member type
Definition
type
the type of elements of the array
[edit] Possible implementation
template<std::size_t I, class T> struct tuple_element; template<std::size_t I, class T, std::size_t N> struct tuple_element<I, std::array <T,N>> { using type = T; };
[edit] Example
Run this code
#include <array> #include <tuple> #include <type_traits> int main() { // define array and get the type of the element at position 0 std::array <int, 10> data{0, 1, 2, 3, 4, 5, 6, 7, 8, 9}; using T = std::tuple_element <0, decltype(data)>::type; // int static_assert(std::is_same_v <T, int>); const auto const_data = data; using CT = std::tuple_element <0, decltype(const_data)>::type; // const int // the result of tuple_element depends on the cv-qualification of the tuple-like type static_assert(!std::is_same_v <T, CT>); static_assert(std::is_same_v <CT, const int>); }
[edit] See also
Structured binding (C++17)
binds the specified names to sub-objects or tuple elements of the initializer[edit]