template<typename _RandomAccessIterator> inline void nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth, _RandomAcce

template<typename _RandomAccessIterator> inline void nth_element(_RandomAccessIterator __first, _RandomAccessIterator __nth, _RandomAccessIterator __last) { typedef typename iterator_traits<_RandomAccessIterator>::value_type _ValueType; // concept requirements __glibcxx_function_requires(_Mutable_RandomAccessIteratorConcept<_RandomAccessIterator>) __glibcxx_function_requires(_LessThanComparableConcept<_ValueType>) __glibcxx_requires_valid_range(__first, __nth); __glibcxx_requires_valid_range(__nth, __last); if (__first == __last || __nth == __last) return; std::__introselect(__first, __nth, __last, std::__lg(__last - __first) * 2); }