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Merge pull request #1206 from barcharcraz/windowsRandom

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Windows random(float): float
This commit is contained in:
Varriount
2014-05-21 17:54:22 -04:00
parent 6b6262bc1c d32b4272c3
commit 2fa739a2e8
1 changed files with 14 additions and 7 deletions
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21
lib/pure/math.nim
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@@ -135,12 +135,12 @@ proc random*(max: int): int {.gcsafe.}
## which initializes the random number generator with a "random"
## number, i.e. a tickcount.
when not defined(windows):
proc random*(max: float): float {.gcsafe.}
## returns a random number in the range 0..<max. The sequence of
## random number is always the same, unless `randomize` is called
## which initializes the random number generator with a "random"
## number, i.e. a tickcount. This is currently not supported for windows.
proc random*(max: float): float {.gcsafe.}
## returns a random number in the range 0..<max. The sequence of
## random number is always the same, unless `randomize` is called
## which initializes the random number generator with a "random"
## number, i.e. a tickcount. This has a 16-bit resolution on windows
## and a 48-bit resolution on other platforms.
proc randomize*() {.gcsafe.}
## initializes the random number generator with a "random"
@@ -205,7 +205,14 @@ when not defined(JS):
proc drand48(): float {.importc: "drand48", header: "<stdlib.h>".}
proc random(max: float): float =
result = drand48() * max
when defined(windows):
proc random(max: float): float =
# we are hardcodeing this because
# importcing macros is extremely problematic
# and because the value is publicly documented
# on MSDN and very unlikely to change
const rand_max = 32767
result = (float(rand()) / float(rand_max)) * max
proc randomize() =
randomize(cast[int](epochTime()))