Reference: std::is_sorted In the example section of the above link, I see the following usage: int data[] = {3, 1, 4, 1, 5}; assert(not std::is_sorted(std::begin(data), std::end(data))); I am familiar with the syntax assert(! <condition>) Evidently, assert(not <condition>) is similar, but wanted to know whether it has been documented somewhere in the standard? TIA Vin >Solution… Read More Usage assert(not <condition>)