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Array typedesc len (#6032)

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ephja
2017-09-17 15:48:02 +02:00
committed by Andreas Rumpf
parent ae7fe5087f
commit ea47234b35
2 changed files with 19 additions and 1 deletions
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2
lib/system.nim
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@@ -718,7 +718,7 @@ proc len*[TOpenArray: openArray|varargs](x: TOpenArray): int {.
magic: "LengthOpenArray", noSideEffect.}
proc len*(x: string): int {.magic: "LengthStr", noSideEffect.}
proc len*(x: cstring): int {.magic: "LengthStr", noSideEffect.}
proc len*[I, T](x: array[I, T]): int {.magic: "LengthArray", noSideEffect.}
proc len*(x: (type array)|array): int {.magic: "LengthArray", noSideEffect.}
proc len*[T](x: seq[T]): int {.magic: "LengthSeq", noSideEffect.}
## returns the length of an array, an openarray, a sequence or a string.
## This is roughly the same as ``high(T)-low(T)+1``, but its resulting type is

18
tests/array/tarraylen.nim Normal file
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@@ -0,0 +1,18 @@
discard """
output: ""
"""
var a: array[0, int]
doAssert a.len == 0
doAssert array[0..0, int].len == 1
doAssert array[0..0, int]([1]).len == 1
doAssert array[1..1, int].len == 1
doAssert array[1..1, int]([1]).len == 1
doAssert array[2, int].len == 2
doAssert array[2, int]([1, 2]).len == 2
doAssert array[1..3, int].len == 3
doAssert array[1..3, int]([1, 2, 3]).len == 3
doAssert array[0..2, int].len == 3
doAssert array[0..2, int]([1, 2, 3]).len == 3
doAssert array[-2 .. -2, int].len == 1
doAssert([1, 2, 3].len == 3)
doAssert([42].len == 1)