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

public member function

<set>

std::set::end 
      iterator end();const_iterator end() const;
      iterator end() noexcept;const_iterator end() const noexcept;

Return iterator to end

Returns an iterator referring to the past-the-end element in the set container.

The past-the-end element is the theoretical element that would follow the last element in the set container. It does not point to any element, and thus shall not be dereferenced.

Because the ranges used by functions of the standard library do not include the element pointed by their closing iterator, this function is often used in combination with set::begin to specify a range including all the elements in the container.

If the container is empty, this function returns the same as set::begin.



Parameters none

Return Value An iterator to the past-the-end element in the container.

If the set object is const-qualified, the function returns a const_iterator. Otherwise, it returns an iterator.

Member types iterator and const_iterator are bidirectional iterator types pointing to elements.



Example 
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// set::begin/end
#include <iostream>
#include <set>

int main ()
{
  int myints[] = {75,23,65,42,13};
  std::set<int> myset (myints,myints+5);

  std::cout << "myset contains:";
  for (std::set<int>::iterator it=myset.begin(); it!=myset.end(); ++it)
    std::cout << ' ' << *it;

  std::cout << '\n';

  return 0;
}

Output: 
myset contains: 13 23 42 65 75


Complexity Constant.

Iterator validity No changes.

Data races The container is accessed (neither the const nor the non-const versions modify the container).
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::begin
Return iterator to beginning (public member function)
set::rbegin
Return reverse iterator to reverse beginning (public member function)
set::rend
Return reverse iterator to reverse end (public member function)

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