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Add len for Slice[T] where T is ordinal (#5847)

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cooldome 2017-05-29 08:41:00 +01:00 • committed by Andreas Rumpf
commit aef5b2eb54
1 changed files with 8 additions and 0 deletions
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8
lib/system.nim
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@ -2047,6 +2047,14 @@ proc clamp*[T](x, a, b: T): T =
if x > b: return b if x > b: return b
return x return x
proc len*[T: Ordinal](x: Slice[T]): int {.noSideEffect, inline.} =
## length of ordinal slice, when x.b < x.a returns zero length
##
## .. code-block:: Nim
## assert((0..5).len == 6)
## assert((5..2).len == 0)
result = max(0, ord(x.b) - ord(x.a) + 1)
iterator items*[T](a: openArray[T]): T {.inline.} = iterator items*[T](a: openArray[T]): T {.inline.} =
## iterates over each item of `a`. ## iterates over each item of `a`.
var i = 0 var i = 0