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fixes #6631

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This commit is contained in:
Andreas Rumpf
2017-10-30 14:45:57 +01:00
parent 280dae0ffb
commit b14cc1e3b2
8 changed files with 65 additions and 38 deletions
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4
lib/pure/algorithm.nim
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@@ -425,7 +425,7 @@ proc rotatedInternal[T](arg: openarray[T]; first, middle, last: int): seq[T] =
for i in last ..< arg.len:
result[i] = arg[i]
proc rotateLeft*[T](arg: var openarray[T]; slice: Slice[int, int]; dist: int): int =
proc rotateLeft*[T](arg: var openarray[T]; slice: HSlice[int, int]; dist: int): int =
## Performs a left rotation on a range of elements. If you want to rotate right, use a negative ``dist``.
## Specifically, ``rotateLeft`` rotates the elements at ``slice`` by ``dist`` positions.
## The element at index ``slice.a + dist`` will be at index ``slice.a``.
@@ -457,7 +457,7 @@ proc rotateLeft*[T](arg: var openarray[T]; dist: int): int =
let distLeft = ((dist mod arglen) + arglen) mod arglen
arg.rotateInternal(0, distLeft, arglen)
proc rotatedLeft*[T](arg: openarray[T]; slice: Slice[int, int], dist: int): seq[T] =
proc rotatedLeft*[T](arg: openarray[T]; slice: HSlice[int, int], dist: int): seq[T] =
## same as ``rotateLeft``, just with the difference that it does
## not modify the argument. It creates a new ``seq`` instead
let sliceLen = slice.b + 1 - slice.a