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

From cppreference.com
< cpp‎ | container‎ | span

[edit template]
 
C++
 
Containers library
 
std::span
 
constexpr iterator end() const noexcept;
 (1) (since C++20)
constexpr const_iterator cend() const noexcept;
 (2) (since C++23)

Returns an iterator past the last element of *this.

This returned iterator only acts as a sentinel. It is not guaranteed to be dereferenceable.

range-begin-end.svg

Contents

[edit] Return value

Iterator past the last element.

[edit] Complexity

Constant.

[edit] Example

Run this code
#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);
}

Output: 

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

[edit] See also

(C++23)
 returns an iterator to the beginning
(public member function) [edit]
(C++11)(C++14)
 returns an iterator to the end of a container or array
(function template) [edit]
Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/container/span/end&oldid=135418"

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