In order to iterate the indices with a neat syntax the previous code is wrapped into a utility function named parallel_for() as shown below:
template <typename Policy, typename Index, typename F>auto parallel_for(Policy p, Index first, Index last, F f) { auto r = make_linear_range<Index>(first, last, last); std::for_each(std::move(p), r.begin(), r.end(), std::move(f));}
The parallel_for() can then be used like this:
parallel_for(std::execution::par, size_t{0}, mice.size(), [&](size_t i){
if (idx == 0) mice[i] += " is first.";
else if (i + 1 == mice.size()) mice[i] += " is last.";
});
for(const auto& m: mice) std::cout << m << ', ';// Output: Mickey is first, Minnie, Jerry is last,
As the parallel_for ...
