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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/container/set/end.html below:

std::set<Key,Compare,Allocator>::end, std::set<Key,Compare,Allocator>::cend - cppreference.com

iterator end();

const_iterator end() const;

const_iterator cend() const noexcept;

Returns an iterator past the last element of *this.

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

Iterator past the last element.

Constant.

Because both iterator and const_iterator are constant iterators (and may in fact be the same type), it is not possible to mutate the elements of the container through an iterator returned by any of these member functions.

libc++ backports cend() to C++98 mode.

#include <algorithm>
#include <iostream>
#include <set>
 
int main()
{
    std::set<int> set{3, 1, 4, 1, 5, 9, 2, 6, 5};
    std::for_each(set.cbegin(), set.cend(), [](int x)
    {
        std::cout << x << ' ';
    });
    std::cout << '\n';
}

Output:

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