tuple_element Class <array>
The latest version of this topic can be found at Visual Studio 2017 Documentation.
Wraps the type of an array element.
Syntax
// CLASS tuple_element (find element by index)
template <size_t Index, class Tuple>
struct tuple_element;
template <size_t Index, class T, size_t Size>
struct tuple_element<Index, array<T, Size>>
// tuple_element for const
template <size_t Index, class Tuple>
struct tuple_element<Index, const Tuple>;
// tuple_element for volatile
template <size_t Index, class Tuple>
struct tuple_element<Index, volatile Tuple>;
// tuple_element for const volatile
template <size_t Index, class Tuple>
struct tuple_element<Index, const volatile Tuple>;
template <size_t Index, class Tuple>
using tuple_element_t = typename tuple_element<Index, Tuple>::type;
Parameters
Index
The element position.
T
The type of an element.
N
The size of the array.
Remarks
This template class is a specialization of the template class tuple_element Class for arrays. This class provides an interface to an array as a tuple of N elements, each of which has the same type. Each specialization has a nested typedef type that is a synonym for the type of the Index element of the array, with any const-volatile qualifications preserved.
Example
#include <array>
#include <iostream>
using namespace std;
typedef array<int, 4> MyArray;
int main()
{
MyArray c0 { 0, 1, 2, 3 };
for (const auto& e : c0)
{
cout << " " << e;
}
cout << endl;
// display first element " 0"
tuple_element<0, MyArray>::type val = c0.front();
cout << " " << val << endl;
}
/*
Output:
0 1 2 3
0
*/
Requirements
Header: <array>
Namespace: std