C++ Array Library - get() Function

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Description

The C++ function std::array::get(std::array) Returns reference to the I^th element of the array container.

Declaration

Following is the declaration for std::array::get(std::array) function form std::array header.

template <size_t I, class T, size_t N> T& get (array<T,N>& arr) noexcept;
template <size_t I, class T, size_t N> T&& get (array<T,N>&& arr) noexcept;
template <size_t I, class T, size_t N> const T& get (const array<T,N>& arr) noexcept;

Parameters

• I − position of an element in the array, with 0 as the position of the first element.

• T − type of elements contained in the array.

• arr − an array container.

Return Value

A reference to the element at the specified position in the array.

Exceptions

This member function never throws exception.

Time complexity

Constant i.e. O(1)

Example

The following example shows the usage of std::array::get(std::array) function.

#include <iostream>
#include <array>

using namespace std;

int main(void) {

   array<int, 3> arr = {10, 20, 30};

   cout << "arr[0] = " << get<0>(arr) << "\n";
   cout << "arr[1] = " << get<1>(arr) << "\n";
   cout << "arr[2] = " << get<2>(arr) << "\n";

   return 0;
}

Let us compile and run the above program, this will produce the following result −

arr[0] = 10
arr[1] = 20
arr[2] = 30