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Showing content from https://cplusplus.com/reference/set/set/cend/ below:

public member function

<set>

std::set::cend 
const_iterator cend() const noexcept;

Return const_iterator to end

Returns a const_iterator pointing to the past-the-end element in the container.

All iterators in set containers are constant iterators (including both const_iterator and iterator member types). These cannot be used to modify the contents they point to, but can be increased and decreased normally (unless they are themselves also const).



Parameters none

Return Value A const_iterator to the element past the end of the sequence.

Member type const_iterator is a bidirectional iterator type that points to a const element.



Example 
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// set::cbegin/cend
#include <iostream>
#include <set>

int main ()
{
  std::set<int> myset = {50,20,60,10,25};

  std::cout << "myset contains:";
  for (auto it=myset.cbegin(); it != myset.cend(); ++it)
    std::cout << ' ' << *it;

  std::cout << '\n';

  return 0;
}

Output: 
myset contains: 10 20 25 50 60


Complexity Constant.

Iterator validity No changes.

Data races The container is accessed.
Concurrently accessing the elements of a set is safe.

Exception safetyNo-throw guarantee: this member function never throws exceptions.
The copy construction or assignment of the returned iterator is also guaranteed to never throw.

See also
set::end
Return iterator to end (public member function)
set::cbegin
Return const_iterator to beginning (public member function)

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