<array> functions

The latest version of this topic can be found at <array> functions.

|get Function|swap Function|

get Function

Returns a reference to arr[Index].

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

Parameters

Index
The element offset.

T
The type of an element.

N
The number of elements in the array.

arr
The array to select from.

Example

#include <array>   
#include <iostream>   
  
using namespace std;  
  
typedef array<int, 4> MyArray;  
  
int main()  
{  
    MyArray c0 { 0, 1, 2, 3 };  
  
    // display contents " 0 1 2 3"   
    for (const auto& e : c0)  
    {  
        cout << " " << e;  
    }  
    cout << endl;  
  
    // display odd elements " 1 3"   
    cout << " " << get<1>(c0);  
    cout << " " << get<3>(c0) << endl;  
}  
  
/*  
Output:  
0 1 2 3  
1 3  
*/  

swap Function

Swaps two arrays.

template <class Ty, std::size_t N>  
void swap(
    array<Ty, N>& left,  
    array<Ty, N>& right);

Parameters

Ty
The type of an element.

N
The size of the array.

left
The first array to swap.

right
The second array to swap.

Remarks

The template function executes left. swap(``right``).

Example

// std_tr1__array__swap.cpp   
// compile with: /EHsc   
#include <array>   
#include <iostream>   
  
typedef std::array<int, 4> Myarray;   
int main()   
    {   
    Myarray c0 = {0, 1, 2, 3};   
  
// display contents " 0 1 2 3"   
    for (Myarray::const_iterator it = c0.begin();   
        it != c0.end(); ++it)   
        std::cout << " " << *it;   
    std::cout << std::endl;   
  
    Myarray c1 = {4, 5, 6, 7};   
    c0.swap(c1);   
  
// display swapped contents " 4 5 6 7"   
    for (Myarray::const_iterator it = c0.begin();   
        it != c0.end(); ++it)   
        std::cout << " " << *it;   
    std::cout << std::endl;   
  
    swap(c0, c1);   
  
// display swapped contents " 0 1 2 3"   
    for (Myarray::const_iterator it = c0.begin();   
        it != c0.end(); ++it)   
        std::cout << " " << *it;   
    std::cout << std::endl;   
  
    return (0);   
    }  
  

0 1 2 3  
4 5 6 7  
0 1 2 3  

See Also

<array>