STD::array in C++

Difficulty Level : Basic
Last Updated : 19 Feb, 2018

The array is a container for constant size arrays. This container wraps around fixed size arrays and also doesn’t loose the information of its length when decayed to a pointer.
In order to utilize array, we need to include the array header:

 #include <array>

Let’s see an example.

// CPP program to demonstrate working of array 
#include <algorithm> 
#include <array> 
#include <iostream> 
#include <iterator> 
#include <string> 
using namespace std; 
  
int main() { 
  
  // construction uses aggregate initialization 
  // double-braces required 
  array<int, 5> ar1{{3, 4, 5, 1, 2}}; 
  array<int, 5> ar2 = {1, 2, 3, 4, 5}; 
  array<string, 2> ar3 = {{string("a"), "b"}}; 
  
  cout << "Sizes of arrays are" << endl; 
  cout << ar1.size() << endl; 
  cout << ar2.size() << endl; 
  cout << ar3.size() << endl; 
    
  cout << "\nInitial ar1 : "; 
  for (auto i : ar1) 
    cout << i << ' '; 
  
  // container operations are supported 
  sort(ar1.begin(), ar1.end()); 
  
  cout << "\nsorted ar1 : "; 
  for (auto i : ar1) 
    cout << i << ' '; 
  
  // Filling ar2 with 10 
  ar2.fill(10); 
  
  cout << "\nFilled ar2 : "; 
  for (auto i : ar2) 
    cout << i << ' '; 
  
  
  // ranged for loop is supported 
  cout << "\nar3 : "; 
  for (auto &s : ar3) 
    cout << s << ' '; 
  
  return 0; 
} 

Output:

Sizes of arrays are
5
5
2

Initial ar1 : 3 4 5 1 2 
sorted ar1 : 1 2 3 4 5 
Filled ar2 : 10 10 10 10 10 
ar3 : a b

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