CODE EXAMPLE FOR PERL

array initialization

#include <string>
#include <iterator>
#include <iostream>
#include <algorithm>
#include <array>
 
int main()
{
    // construction uses aggregate initialization
    std::array<int, 3> a1{ {1, 2, 3} }; // double-braces required in C++11 prior to
                                        // the CWG 1270 revision (not needed in C++11
                                        // after the revision and in C++14 and beyond)
 
    std::array<int, 3> a2 = {1, 2, 3};  // double braces never required after =
 
    std::array<std::string, 2> a3 = { std::string("a"), "b" };
 
    // container operations are supported
    std::sort(a1.begin(), a1.end());
    std::reverse_copy(a2.begin(), a2.end(), 
                      std::ostream_iterator<int>(std::cout, " "));
 
    std::cout << '
';
 
    // ranged for loop is supported
    for(const auto& s: a3)
        std::cout << s << ' ';
 
    // deduction guide for array creation (since C++17)
    [[maybe_unused]] std::array a4{3.0, 1.0, 4.0};  // -> std::array<double, 3>
}