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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../ranges/cend.html below:

std::ranges::cend - cppreference.com

inline namespace /* unspecified */ { inline constexpr /* unspecified */ cend = /* unspecified */; } (since C++20)
(customization point object)

Call signature

template< class T > requires /* see below */ constexpr /* see below */ auto cend( T&& t ); (since C++20)

Returns a sentinel for the constant iterator(since C++23) indicating the end of a const-qualified(until C++23) range.

If ranges::cend(e) is valid for an expression e, where decltype((e)) is T, then CT models std::ranges::range, and(until C++23) std::sentinel_for<S, I> is true in all cases, where S is decltype(ranges::cend(e)), and I is decltype(ranges::cbegin(e)). Additionally, S models constant-iterator if it models input_iterator.(since C++23)

Customization point objects

The name ranges::cend denotes a customization point object, which is a const function object of a literal semiregular class type. See CustomizationPointObject for details.

[edit] Example

#include <algorithm>
#include <cassert>
#include <ranges>
#include <vector>
 
int main()
{
    std::vector vec{3, 1, 4};
    int arr[]{5, 10, 15};
 
    assert(std::ranges::find(vec, 5) == std::ranges::cend(vec));
    assert(std::ranges::find(arr, 5) != std::ranges::cend(arr));
}

[edit] See also returns a sentinel indicating the end of a range
(customization point object)[edit] returns an iterator to the end of a container or array
(function template) [edit]

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