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v/vlib/rand/pcg32_test.v

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import rand
import time
fn show_u32s(a []u32){
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mut res := []string{}
for x in a {
res << x.str()
}
print('[')
print(res.join(', '))
println(']')
}
fn gen_randoms(initstate i64, initseq i64, bound int) []u32 {
mut randoms := [u32(0)].repeat(20)
mut rnd := rand.new_pcg32( u64(initstate), u64(initseq) )
for i in 0..20 {
randoms[i] = rnd.bounded_next(u32(bound))
}
return randoms
}
fn test_pcg32_reproducibility() {
t := time.ticks()
tseq := t % 23237671
println('t: $t | tseq: $tseq')
randoms1 := gen_randoms(t, tseq, 1000)
randoms2 := gen_randoms(t, tseq, 1000)
assert randoms1.len == randoms2.len
show_u32s(randoms1)
show_u32s(randoms2)
len := randoms1.len
for i in 0..len {
assert randoms1[i] == randoms2[i]
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}
}