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std::get(std::array)

From cppreference.com
< cpp‎ | container‎ | array
template< size_t I, class T, size_t N >
constexpr T& get( array<T,N>& a );
(1) (since C++11)
template< size_t I, class T, size_t N >
constexpr T&& get( array<T,N>&& a );
(2) (since C++11)
template< size_t I, class T, size_t N >
constexpr const T& get( const array<T,N>& a );
(3) (since C++11)
template< size_t I, class T, size_t N >
constexpr const T&& get( const array<T,N>&& a );
(4) (since C++17)

Extracts the Ith element element from the array.

I must be an integer value in range [0, N). This is enforced at compile time as opposed to at() or operator[].

Contents

[edit] Parameters

a - array whose contents to extract

[edit] Return value

A reference to the Ith element of a.

[edit] Exceptions

noexcept specification:  
noexcept
  

[edit] Notes

The overloads are marked as constexpr since C++14.

[edit] Example

#include <iostream>
#include <array>
 
int main()
{
    std::array<int, 3> arr;
 
    // set values:
    std::get<0>(arr) = 1;
    std::get<1>(arr) = 2;
    std::get<2>(arr) = 3;
 
    // get values:
    std::cout << "(" << std::get<0>(arr) << ", " << std::get<1>(arr)
              << ", " << std::get<2>(arr) << ")\n";
}

Output:

(1, 2, 3)

[edit] See also

access specified element
(public member function) [edit]
access specified element with bounds checking
(public member function) [edit]
tuple accesses specified element
(function template) [edit]
accesses an element of a pair
(function template) [edit]
reads the value of the variant given the index or the type (if the type is unique), throws on error
(function template) [edit]