As we have seen in the preceding recipe, the range-based for loops, known as for each in other programming languages, allows you to iterate over the elements of a range, providing a simplified syntax over the standard for loops and making the code more readable in many situations. However, range-based for loops do not work out of the box with any type representing a range, but require the presence of a begin() and end() function (for non-array types) either as a member or free function. In this recipe, we will see how to enable a custom type to be used in range-based for loops.