diff options
Diffstat (limited to 'random.h')
-rw-r--r-- | random.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/random.h b/random.h new file mode 100644 index 0000000..4e0b8c9 --- /dev/null +++ b/random.h @@ -0,0 +1,20 @@ +#pragma once + +#include <stdint.h> + +#define XORSHIFT_S 16 + +typedef struct { + uint64_t s[XORSHIFT_S]; + int p; +} randctx; + +void rand_seed (randctx * const st); +uint64_t rand_u64 (randctx * const st); +double rand_d01 (randctx * const st); +double rand_d11 (randctx * const st); +int rand_bool (randctx * const st); + +#define rand_distrib(st,v) ((v)[rand_u64(st)%vlen(v)]) +#define rand_mod(st,max) (rand_u64(st)%(max)) + |