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Function std.algorithm.sorting.isSorted
Checks whether a forward range is sorted according to the comparison
operation less. Performs Ο(r.length) evaluations of less.
Prototype
bool isSorted(alias less, Range)( Range r ) if (isForwardRange!Range);
Example
int[] arr = [4, 3, 2, 1]; assert(!isSorted(arr)); sort(arr); assert(isSorted(arr)); sort!("a > b")(arr); assert(isSorted!("a > b")(arr));