On Sunday, 23 June 2013 at 04:08:22 UTC, Vladimir Panteleev wrote:
On Saturday, 22 June 2013 at 20:09:01 UTC, monarch_dodra wrote:
#2: Extremelly bad compatibility with simple no
bidir/non-slicing ranges: There is no way to iterate over a
specific part of a range, and making a range out of what was
just iterated over. For example "Get the beggining of this
range until the first x": not possible without slicing.
Not sure if I understood the question correctly, but the way I
understood it:
1) To iterate over a specific part of a non-random-access
range, you can use `drop` in conjunction with `take` or
`takeExactly`.
2) To get an existing foreach loop to emit a range, move its
body to the predicate of `map`, and break conditions to the
predicate of `until` / `countUntil`.
3) As I understand, "get the beggining of this range until the
first x, without slicing" is what `until` (or `countUntil` +
`take`) does.
All of these will *iterate* over part of said range, but none
will actually return the subrange I iterated on.
V
[ . . X . . . . . . . . ]
I want:
[ . . X ]
D gives me:
[ X . . . . . . . . ]
countUntil + take can kind of mitigate the problem, but that
warps the type system: The type of take is not the type of the
range.
