对码当歌,猿生几何?

std::set::end, std::set::cend

From cppreference.com
< cpp‎ | container‎ | set

iterator end();
const_iterator end() const;
const_iterator cend() const;
(since C++11)

Returns an iterator to the element following the last element of the container.

This element acts as a placeholder; attempting to access it results in undefined behavior.

range-begin-end.svg

Parameters

(none)

Return value

Iterator to the element following the last element.

Exceptions

(none) (until C++11)
noexcept specification:  
noexcept
  
(since C++11)

Complexity

Constant.

See also

returns an iterator to the beginning
(public member function)