28 Algorithms library [algorithms]

28.7 Sorting and related operations [alg.sorting]

28.7.6 Set operations on sorted structures [alg.set.operations]

28.7.6.1 includes [includes]

template<class InputIterator1, class InputIterator2> constexpr bool includes(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, InputIterator2 last2); template<class ExecutionPolicy, class ForwardIterator1, class ForwardIterator2> bool includes(ExecutionPolicy&& exec, ForwardIterator1 first1, ForwardIterator1 last1, ForwardIterator2 first2, ForwardIterator2 last2); template<class InputIterator1, class InputIterator2, class Compare> constexpr bool includes(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, InputIterator2 last2, Compare comp); template<class ExecutionPolicy, class ForwardIterator1, class ForwardIterator2, class Compare> bool includes(ExecutionPolicy&& exec, ForwardIterator1 first1, ForwardIterator1 last1, ForwardIterator2 first2, ForwardIterator2 last2, Compare comp);
Returns: true if [first2, last2) is empty or if every element in the range [first2, last2) is contained in the range [first1, last1).
Returns false otherwise.
Complexity: At most 2 * ((last1 - first1) + (last2 - first2)) - 1 comparisons.