std::span<T,Extent>::end, std::span<T,Extent>::cend

From cppreference.com
< cpp‎ | container‎ | span

 
 
 
std::span
Member functions
(C++20)
Element access
(C++20)
(C++20)
Iterators
span::endspan::cend
(C++20)(C++23)
(C++20)(C++23)
Observers
(C++20)
Subviews
(C++20)
Non-member functions
Non-member constant
Deduction guides(C++20)
 
constexpr iterator end() const noexcept;
(1) (since C++20)
constexpr const_iterator cend() const noexcept;
(2) (since C++23)

Returns an iterator to the element following the last element of the span.

This element acts as a placeholder; attempting to access it results in undefined behavior.

range-begin-end.svg

Parameters

(none)

Return value

Iterator to the element following the last element.

Complexity

Constant.

Example

#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 (not 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);
}

Output:

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

See also

(C++20)(C++23)
returns an iterator to the beginning
(public member function)
(C++11)(C++14)
returns an iterator to the end of a container or array
(function template)