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Showing content from https://cplusplus.com/unordered_set::end below:

public member type

<unordered_set>

      iterator end() noexcept;const_iterator end() const noexcept;

      local_iterator end (size_type n);const_local_iterator end (size_type n) const;

Return iterator to end

The iterator returned by end does not point to any element, but to the position that follows the last element in the unordered_set container (its past-the-end position). Thus, the value returned shall not be dereferenced - it is generally used to describe the open-end of a range, such as [begin,end).

Notice that an unordered_set object makes no guarantees on how its elements are ordered. But, in any case, the range that goes from its begin to its end covers all the elements in the container (or the bucket), until invalidated.

All iterators in an unordered_set have const access to the elements (even those whose type is not prefixed with const_): Elements can be inserted or removed, but not modified while in the container.

n

Bucket number. This shall be lower than bucket_count.
It is an optional parameter that changes the behavior of this member function: if set, the iterator retrieved points to the past-the-end element of a bucket, otherwise it points to the past-the-end element of the container.
Member type size_type is an unsigned integral type.

All return types (iterator, const_iterator, local_iterator and const_local_iterator) are member types. In the unordered_set class template, these are forward iterator types.

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// unordered_set::begin/end example
#include <iostream>
#include <string>
#include <unordered_set>

int main ()
{
  std::unordered_set<std::string> myset =
  {"Mercury","Venus","Earth","Mars","Jupiter","Saturn","Uranus","Neptune"};

  std::cout << "myset contains:";
  for ( auto it = myset.begin(); it != myset.end(); ++it )
    std::cout << " " << *it;
  std::cout << std::endl;

  std::cout << "myset's buckets contain:\n";
  for ( unsigned i = 0; i < myset.bucket_count(); ++i) {
    std::cout << "bucket #" << i << " contains:";
    for ( auto local_it = myset.begin(i); local_it!= myset.end(i); ++local_it )
      std::cout << " " << *local_it;
    std::cout << std::endl;
  }

  return 0;
}

myset contains: Venus Jupiter Neptune Mercury Earth Uranus Saturn Mars
myset's buckets contain:
bucket #0 contains:
bucket #1 contains: Venus
bucket #2 contains: Jupiter
bucket #3 contains: 
bucket #4 contains: Neptune Mercury
bucket #5 contains: 
bucket #6 contains: Earth
bucket #7 contains: Uranus Saturn
bucket #8 contains: Mars
bucket #9 contains: 
bucket #10 contains: 

unordered_set::begin

Return iterator to beginning (public member type)

unordered_set::cend

Return const_iterator to end (public member function)

unordered_set::find

Get iterator to element (public member function)

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