On Wednesday, January 8, 2020 10:56:20 PM MST rikki cattermole via Digitalmars-d-learn wrote: > Slicing via the opSlice operator overload is a convention, not a > requirement.
It's not a requirement, but it's more than a convention. If you use the container with foreach, the compiler will call opSlice on the container to get a range. So, there's no need to implement opApply to iterate over a container with foreach. You could choose to implement a container with opApply and use a function other than opSlice for getting a range, but the compiler understands enough to try to slice the container for you automatically when using it with foreach. - Jonathan M Davis
