
Category: algorithms  Component type: function 
template <class ForwardIterator> bool is_sorted(ForwardIterator first, ForwardIterator last) template <class ForwardIterator, class StrictWeakOrdering> bool is_sorted(ForwardIterator first, ForwardIterator last, StrictWeakOrdering comp)
The two versions of is_sorted differ in how they define whether one element is less than another. The first version compares objects using operator<, and the second compares objects using the function object comp. The first version of is_sorted returns true if and only if, for every iterator i in the range [first, last  1), *(i + 1) < *i is false. The second version returns true if and only if, for every iterator i in the range [first, last  1), comp(*(i + 1), *i) is false
int A[] = {1, 4, 2, 8, 5, 7}; const int N = sizeof(A) / sizeof(int); assert(!is_sorted(A, A + N)); sort(A, A + N); assert(is_sorted(A, A + N));
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