std::span end() method

since C++20

constexpr iterator end() const noexcept;

Returns an iterator

to the element following the last element of the view.

If the view is empty, the returned iterator will be equal to begin().

Parameters

(none)

Return value

Iterator to the first element.

Complexity

Constant - O(1).

Example

Main.cpp

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

Output

1 3 4 5 
1
2 3 4 5