On Wednesday, 19 December 2012 at 15:19:01 UTC, Nekroze wrote:
On Wednesday, 19 December 2012 at 14:08:25 UTC, Rafael wrote:
On Wednesday, 19 December 2012 at 13:28:24 UTC, Nekroze wrote:
On Wednesday, 19 December 2012 at 12:27:32 UTC, Rafael wrote:
1) It is possible to implement multiindex access using
opIndex* methods, moreover this is the simplest way to
multiindex access realization. So, we have [i, j, k]
notation. Next step after it - slices implementation and it
looks logical to save the same notation for it: [i1..i2,
j1..j2, k]. But it impossible, if I understand correctly.
2) On the other hand. Syntax via [i][j] leads to some
overhead: first index access [i] must return some light
accessor object (like range (or iterator)) which supports
the index access operation. But using this approach it is
possible to implement multidimensional slices. And this
means, that opIndex* methods with multiindex are not needed.
Well if you are looking at operator overloading you can
overload opSlice as described here
http://dlang.org/operatoroverloading.html#Slice however i am
not sure if you can defined multiple slices delimited by
commas in the same [] block but it is worth a try.
...and we return to my initial question :)
The answer is: no, D is not support multidimension slices.
Possible way to solve it is to define some auxiliary structure
Slice, and use multiindex by following way:
S [ Slice(0, $), 2] = A [ Slice(0, $), 2];
Instead of defining a struct for that why not allow index to
take a uint array defining the lower and upper bounds of the
slice. You may have to make the opSlice or opIndex a template
however but I believe you should be able to take a uint[2] as
an argument.
Atleast this way you dont have to add more structs to the mix
and you can just do:
S[[0, S.length], 2] = A [[0, A.length], 2];
or some such, there may be a way of preserving the $ symbol but
you would have to deal with that anyway if you made it an
argument to a struct. perhaps a string mixin?
Yes, it is good solution, thank you! But anyway it means not so
nice and laconic syntax..
P.S. yes, I am killjoy :)
