23 Algorithms library [algorithms]

23.7 Sorting and related operations [alg.sorting]

23.7.1 Sorting [alg.sort]

23.7.1.5 is_­sorted [is.sorted]

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template<class ForwardIterator> constexpr bool is_sorted(ForwardIterator first, ForwardIterator last);
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Returns: is_­sorted_­until(first, last) == last.
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template<class ExecutionPolicy, class ForwardIterator> bool is_sorted(ExecutionPolicy&& exec, ForwardIterator first, ForwardIterator last);
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Returns: is_­sorted_­until(std​::​forward<ExecutionPolicy>(exec), first, last) == last.
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template<class ForwardIterator, class Compare> constexpr bool is_sorted(ForwardIterator first, ForwardIterator last, Compare comp);
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Returns: is_­sorted_­until(first, last, comp) == last.
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template<class ExecutionPolicy, class ForwardIterator, class Compare> bool is_sorted(ExecutionPolicy&& exec, ForwardIterator first, ForwardIterator last, Compare comp);
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Returns: 
is_sorted_until(std::forward<ExecutionPolicy>(exec), first, last, comp) == last
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template<class ForwardIterator> constexpr ForwardIterator is_sorted_until(ForwardIterator first, ForwardIterator last); template<class ExecutionPolicy, class ForwardIterator> ForwardIterator is_sorted_until(ExecutionPolicy&& exec, ForwardIterator first, ForwardIterator last); template<class ForwardIterator, class Compare> constexpr ForwardIterator is_sorted_until(ForwardIterator first, ForwardIterator last, Compare comp); template<class ExecutionPolicy, class ForwardIterator, class Compare> ForwardIterator is_sorted_until(ExecutionPolicy&& exec, ForwardIterator first, ForwardIterator last, Compare comp);
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Returns: If (last - first) < 2, returns last.
Otherwise, returns the last iterator i in [first, last] for which the range [first, i) is sorted.
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Complexity: Linear.