tuple_element Class <tuple>
Visual Studio 2015
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Wraps a tuple element.
// CLASS tuple_element (find element by index) template <size_t Index, class Tuple> struct tuple_element; // 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 index of the designated element.
Tuple
The type of the tuple.
The template class has a nested typedef type that is a synonym for the type at index Index of the tuple type Tuple.
#include <tuple>
#include <string>
#include <iostream>
using namespace std;
typedef tuple<int, double, string> MyTuple;
int main()
{
MyTuple c0{ 0, 1.5, "Tail" };
tuple_element_t<0, MyTuple> val = get<0>(c0); //get by index
tuple_element_t<1, MyTuple> val2 = get<1>(c0);
tuple_element_t<2, MyTuple> val3 = get<string>(c0); // get by type
cout << val << " " << val2 << " " << val3 << endl;
}
/*
Output:
0 1.5 Tail
*/
Header: <tuple>
Namespace: std
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