How do you do it?

Reverse For Loops in C++

by Carlos Buchart

From the article:

As we saw when working on dynamic bitsets, it can be useful to traverse a collection backwards, from its last element to its first one.

It would be nice to be able to use C++11 range for loops to iterate backwards. But unfortunately, there is no such reverse range-for: range-for only works forwards.

Let’s see how to traverse a collection backwards by using a range for loop...