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

 

C++

Compiler support

Freestanding and hosted

Language

Standard library

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Metaprogramming library (C++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Concurrency support library (C++11)

Technical specifications

Symbols index

External libraries

 

Containers library

Sequence

array (C++11)

vector

vector<bool>

deque

forward_list (C++11)

list

Associative

set

multiset

map

multimap

Unordered associative

unordered_set (C++11)

unordered_multiset (C++11)

unordered_map (C++11)

unordered_multimap (C++11)

Adaptors

stack

queue

priority_queue

flat_set (C++23)

flat_multiset (C++23)

flat_map (C++23)

flat_multimap (C++23)

Views

span (C++20)

mdspan (C++23)

Iterator invalidation

Member function table

Non-member function table

 

std::span

Member functions

span::span (C++20)

span::operator= (C++20)

Element access

span::front (C++20)

span::back (C++20)

span::operator[] (C++20)

span::data (C++20)

Iterators

span::beginspan::cbegin (C++20)(C++23)

span::endspan::cend (C++20)(C++23)

span::rbeginspan::crbegin (C++20)(C++23)

span::rendspan::crend (C++20)(C++23)

Observers

span::empty (C++20)

span::size (C++20)

span::size_bytes (C++20)

Subviews

span::first (C++20)

span::last (C++20)

span::subspan (C++20)

Non-member functions

as_bytesas_writable_bytes (C++20)(C++20)

Non-member constant

dynamic_extent (C++20)

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.

Parameters

(none)

Return value

Iterator to the element following the last element.

Complexity

Constant.

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 (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

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