Especially since this recipe did not distract us with any complicated real-life problem solution, we were able to fully concentrate on the standard library function calls. It is pretty obvious that the their parallelized versions are hardly different from the classic sequential ones. They only differ by one additional argument, which is the execution policy.

Let's have a look at the invocations and answer three central questions:

generate(execution::par, begin(d), end(d), rand_num);
sort(    execution::par, begin(d), end(d));
reverse( execution::par, begin(d), end(d));

auto odds (count_if(execution::par, begin(d), end(d), odd));