v/vlib/rand/splitmix64_test.v

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import rand
import time
fn show_u64s(a []u64){
mut res := []string
for x in a {
res << x.str()
}
print('[')
print(res.join(', '))
println(']')
}
fn gen_randoms(seed i64, bound int) []u64 {
mut randoms := [u64(0)].repeat(20)
mut rnd := rand.new_splitmix64( u64(seed) )
for i in 0..20 {
randoms[i] = rnd.bounded_next(u64(bound))
}
return randoms
}
fn test_splitmix64_reproducibility() {
t := time.ticks()
println('t: $t')
randoms1 := gen_randoms(t, 1000)
randoms2 := gen_randoms(t, 1000)
assert randoms1.len == randoms2.len
show_u64s( randoms1 )
show_u64s( randoms2 )
len := randoms1.len
for i in 0..len {
assert randoms1[i] == randoms2[i]
}
}