std::span<T,Extent>::begin, std::span<T,Extent>::cbegin

#include <iostream>
#include <span>
 
void print(std::span <const int> array)
{
 std::cout << "array = ";
 for (auto it = array.begin(); it != array.end(); ++it)
 std::cout << *it << ' ';
 std::cout << '\n';
}
 
void set_first_element(std::span <int> sp, int new_value)
{
 if (!sp.empty())
 {
 std::cout << "old *begin = " << *sp.begin() << '\n';
 *sp.begin() = new_value;
 std::cout << "new *begin = " << *sp.begin() << '\n';
 }
}
 
int main()
{
 int array[]{1, 3, 4, 5};
 print(array);
 set_first_element(array, 2);
 print(array);
}

array = 1 3 4 5
old *begin = 1
new *begin = 2
array = 2 3 4 5