[Issue 1553] foreach_reverse is allowed for delegates

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=1553



--- Comment #9 from Vladimir Panteleev <thecybershadow at gmail.com> 2011-07-01 19:38:33 PDT ---
(In reply to comment #8)
> But why couldn't a delegate be written for reverse iteration? 

So put the semantics in the delegate name, instead of expecting the user to
always use the correct one of the two semantically-opposite but actually
synonymous keywords. This can easily become a point of confusion, and I'm
surprised I need to elaborate in so much detail why this is plain bad.

What's wrong with writing it like this?

foreach (v; &foo.reverseIterator) { ... }

If you start writing it like this:

foreach_reverse (v; &foo.reverseIterator)

Sooner or later someone will forget the second "reverse", the code will look
and compile right, and work wrong!

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