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Merge pull request #7495 from GULPF/fix-fill-bug

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Fix algorithm.fill for empty input
This commit is contained in:
Dominik Picheta
2018-04-04 13:54:40 +01:00
committed by GitHub
parent abfcbaa74c 34df046d37
commit 7ef0cfebb5
2 changed files with 24 additions and 14 deletions
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27
lib/pure/algorithm.nim
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@@ -24,16 +24,20 @@ proc `*`*(x: int, order: SortOrder): int {.inline.} =
var y = order.ord - 1
result = (x xor y) - y
proc fill*[T](a: var openArray[T], first, last: Natural, value: T) =
## fills the array ``a[first..last]`` with `value`.
template fillImpl[T](a: var openArray[T], first, last: int, value: T) =
var x = first
while x <= last:
a[x] = value
inc(x)
proc fill*[T](a: var openArray[T], first, last: Natural, value: T) =
## fills the array ``a[first..last]`` with `value`.
fillImpl(a, first, last, value)
proc fill*[T](a: var openArray[T], value: T) =
## fills the array `a` with `value`.
fill(a, 0, a.high, value)
fillImpl(a, 0, a.high, value)
proc reverse*[T](a: var openArray[T], first, last: Natural) =
## reverses the array ``a[first..last]``.
@@ -494,3 +498,20 @@ when isMainModule:
doAssert s4 == "xxxefgabcdxxx"
doAssert s5.rotateLeft(3 ..< 10, 11) == 6
doAssert s5 == "xxxefgabcdxxx"
block product:
doAssert product(newSeq[seq[int]]()) == newSeq[seq[int]](), "empty input"
doAssert product(@[newSeq[int](), @[], @[]]) == newSeq[seq[int]](), "bit more empty input"
doAssert product(@[@[1,2]]) == @[@[1,2]], "a simple case of one element"
doAssert product(@[@[1,2], @[3,4]]) == @[@[2,4],@[1,4],@[2,3],@[1,3]], "two elements"
doAssert product(@[@[1,2], @[3,4], @[5,6]]) == @[@[2,4,6],@[1,4,6],@[2,3,6],@[1,3,6], @[2,4,5],@[1,4,5],@[2,3,5],@[1,3,5]], "three elements"
doAssert product(@[@[1,2], @[]]) == newSeq[seq[int]](), "two elements, but one empty"
block lowerBound:
doAssert lowerBound([1,2,4], 3, system.cmp[int]) == 2
doAssert lowerBound([1,2,2,3], 4, system.cmp[int]) == 4
doAssert lowerBound([1,2,3,10], 11) == 4
block fillEmptySeq:
var s = newSeq[int]()
s.fill(0)

11
tests/stdlib/talgorithm.nim
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@@ -1,11 +0,0 @@
import algorithm
doAssert product[int](newSeq[seq[int]]()) == newSeq[seq[int]](), "empty input"
doAssert product[int](@[newSeq[int](), @[], @[]]) == newSeq[seq[int]](), "bit more empty input"
doAssert product(@[@[1,2]]) == @[@[1,2]], "a simple case of one element"
doAssert product(@[@[1,2], @[3,4]]) == @[@[2,4],@[1,4],@[2,3],@[1,3]], "two elements"
doAssert product(@[@[1,2], @[3,4], @[5,6]]) == @[@[2,4,6],@[1,4,6],@[2,3,6],@[1,3,6], @[2,4,5],@[1,4,5],@[2,3,5],@[1,3,5]], "three elements"
doAssert product(@[@[1,2], @[]]) == newSeq[seq[int]](), "two elements, but one empty"
doAssert lowerBound([1,2,4], 3, system.cmp[int]) == 2
doAssert lowerBound([1,2,2,3], 4, system.cmp[int]) == 4
doAssert lowerBound([1,2,3,10], 11) == 4