On Thursday, 9 January 2020 at 10:26:07 UTC, Jonathan M Davis
wrote:
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
Is this documented in the language spec anywhere? I don't see
anything about it in the section on foreach [1] or the section on
slice operator overloading [2].
[1] https://dlang.org/spec/statement.html#foreach-statement
[2] https://dlang.org/spec/operatoroverloading.html#slice
