diff options
Diffstat (limited to 'lib/pure/mersenne.nim')
| -rw-r--r-- | lib/pure/mersenne.nim | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/lib/pure/mersenne.nim b/lib/pure/mersenne.nim index 6778e2d62..6ec0d66b4 100644 --- a/lib/pure/mersenne.nim +++ b/lib/pure/mersenne.nim @@ -2,24 +2,20 @@ # # Nim's Runtime Library # (c) Copyright 2015 Nim Contributors -# # See the file "copying.txt", included in this # distribution, for details about the copyright. -# - ## The [Mersenne Twister](https://en.wikipedia.org/wiki/Mersenne_Twister) ## random number generator. -## -## **Note:** The procs in this module work at compile-time. +## .. note:: The procs in this module work at compile-time. + +{.deprecated: "use `std/random` instead.".} runnableExamples: var rand = newMersenneTwister(uint32.high) ## must be "var" doAssert rand.getNum() != rand.getNum() ## pseudorandom number - ## See also ## ======== ## * `random module<random.html>`_ for Nim's standard random number generator - type MersenneTwister* = object ## The Mersenne Twister. @@ -35,6 +31,7 @@ proc newMersenneTwister*(seed: uint32): MersenneTwister = (result.mt[i-1] shr 30'u32)) + i) proc generateNumbers(m: var MersenneTwister) = + for i in 0..623: var y = (m.mt[i] and 0x80000000'u32) + (m.mt[(i+1) mod 624] and 0x7fffffff'u32) @@ -48,7 +45,6 @@ proc getNum*(m: var MersenneTwister): uint32 = generateNumbers(m) result = m.mt[m.index] m.index = (m.index + 1) mod m.mt.len - result = result xor (result shr 11'u32) result = result xor ((result shl 7'u32) and 0x9d2c5680'u32) result = result xor ((result shl 15'u32) and 0xefc60000'u32) |