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math/rand: Doc fix for how many bits Seed uses

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Document the fact that the default Source uses only
the bottom 31 bits of the given seed.

Fixes #15788

Change-Id: If20d1ec44a55c793a4a0a388f84b9392c2102bd1
Reviewed-on: https://go-review.googlesource.com/23352
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Jeff R. Allen 2016-05-24 23:00:06 +06:00 committed by Ian Lance Taylor
parent 2f9eeea212
commit 3474610fbc
1 changed files with 2 additions and 1 deletions
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3
src/math/rand/rand.go
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@ -179,7 +179,8 @@ var globalRand = New(&lockedSource{src: NewSource(1)})
// Seed uses the provided seed value to initialize the default Source to a
// deterministic state. If Seed is not called, the generator behaves as
// if seeded by Seed(1).
// if seeded by Seed(1). Only uses the bottom 31 bits of seed; the top 33
// bits are ignored.
func Seed(seed int64) { globalRand.Seed(seed) }
// Int63 returns a non-negative pseudo-random 63-bit integer as an int64