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rand: separate rand.util and rand.seed submodules (#8353)

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This commit is contained in:
Subhomoy Haldar
2021-01-26 19:25:09 +05:30
committed by GitHub
parent 5f2b2df546
commit 97103f680a
16 changed files with 107 additions and 104 deletions
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36
vlib/rand/util/util.v
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@ -3,8 +3,6 @@
// that can be found in the LICENSE file.
module util
import time
// Commonly used constants across RNGs - some taken from "Numerical Recipes".
pub const (
lower_mask = u64(0x00000000FFFFFFFF)
@ -15,37 +13,3 @@ pub const (
u31_mask = u32(0x7FFFFFFF)
u63_mask = u64(0x7FFFFFFFFFFFFFFF)
)
// nr_next returns a next value based on the previous value `prev`.
[inline]
fn nr_next(prev u32) u32 {
return prev * 1664525 + 1013904223
}
// time_seed_array returns the required number of u32s generated from system time.
[inline]
pub fn time_seed_array(count int) []u32 {
ctime := time.now()
mut seed := u32(ctime.unix_time() ^ ctime.microsecond)
mut seed_data := []u32{cap: count}
for _ in 0 .. count {
seed = nr_next(seed)
seed_data << nr_next(seed)
}
return seed_data
}
// time_seed_32 returns a 32-bit seed generated from system time.
[inline]
pub fn time_seed_32() u32 {
return time_seed_array(1)[0]
}
// time_seed_64 returns a 64-bit seed generated from system time.
[inline]
pub fn time_seed_64() u64 {
seed_data := time_seed_array(2)
lower := u64(seed_data[0])
upper := u64(seed_data[1])
return lower | (upper << 32)
}