Bill Baxter wrote:
On Fri, Jul 10, 2009 at 8:15 AM, Andrei
Alexandrescu<seewebsiteforem...@erdani.org> wrote:
Don wrote:
The other thing that's desperately missing from D is multi-dimensional
indexing.
What are the limitations of multiple-argument []?
Andrei
I don't know what Don had in mind, but multi-dimensional slice is
ugly. should be A[ a..b, c..d, e..f ] but currently you have to do
something like A[ [a,c,e]..[b,d,f] ]. Or A[a..b][c..d][e..f] and
bend over backwards to avoid creating too many temporary proxy
objects. Also you'd like to be able to mix and match slices and
indices like A[ a..b, 3, e..f ].
Also a basic built in multi-dim array would be nice. I think most of
the time when people make a new T(10,20) they don't really want 10
arrays of length 20, each of which can be individually resized (and
must be if more capacity is needed). They want one array with size
10 x 20.
--bb
Either, D needs built-in multidimensional arrays, or they must be
implemented in Phobos.
To support slicing of built-in multidim arrays, I think it is necessary
to make slices a different type than arrays, because they would need to
have a stride in order to slice across rows.
-Lars
