On Wednesday, 11 July 2012 at 14:10:35 UTC,
[email protected] (Christophe Travert) wrote:
I think foreach should never call opSlice. That's not in the
online
documentation
(http://dlang.org/statement.html#ForeachStatement), unless
I missed something. If you want to use foreach on a class with
an
opSlice, then yes, you should define opApply. Otherwise, the
user have
to call opSlice himself, which seems reasonable. That's how I
understand
the doc.
Hum... One thing is for sure, it _does_ call opSlice when it is
defined.
I just re-read the docs you linked to, and if that was my only
source, I'd reach the same conclusion as you. however, my "The D
Programming Language", states:
*12: Operator Overloading
**9: Overloading foreach
***1: foreach with Iteration Primitives
"Last but not least, if the iterated object offers the slice
operator with no arguments lst[], __c is initialized with lst[]
instead of lst. This is in order to allow “extracting” the
iteration means out of a container without requiring the
container to define the three iteration primitives."
Another thing I find strange about the doc is: "If the foreach
range properties do not exist, the opApply method will be used
instead." This sounds backwards to me.
