Array

The STL array container is a fixed-size sequence container, just like a C/C++ built-in array, except that the STL array is size-aware and a bit smarter than the built-in C/C++ array. Let's understand an STL array with an example:

#include <iostream>
#include <array>
using namespace std;
int main () {
  array<int,5> a = { 1, 5, 2, 4, 3 };

  cout << "\nSize of array is " << a.size() << endl;

  auto pos = a.begin();

  cout << endl;
  while ( pos != a.end() ) 
    cout << *pos++ << "\t";
  cout << endl;

  return 0;
}

The preceding code can be compiled and the output can be viewed with the following commands:

g++ main.cpp -std=c++17
./a.out

The output of the program is as follows:

Size of array is 5
1     5     2     4     3