[Issue 5939] Cannot copy std.algorithm.map

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5939



--- Comment #7 from Andrei Alexandrescu <andrei at metalanguage.com> 2011-07-12 08:39:19 PDT ---
This is one of those things that could go either way. I see merit in
restricting the result of "map" for direct consumption, without allowing
creating an empty result without a corresponding map call.

On the other hand, it's often impossible to do so. Consider the many filtering
functions that take a range and build additional functionality on top of it.
Such functions need to create a range that contains the subject range as a
member. It's reasonable to require that map can be combined with such
functions.

I think it's best to fix this - e.g. by storing a null frame pointer in the
default-constructed object.

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