include module type of struct include Random endInitialize the generator, using the argument as a seed. The same seed will always yield the same sequence of numbers.
Same as Random.init but takes more data as seed.
Initialize the generator with a random seed chosen in a system-dependent way. If /dev/urandom is available on the host machine, it is used to provide a highly random initial seed. Otherwise, a less random seed is computed from system parameters (current time, process IDs).
Random.int32 bound returns a random integer between 0 (inclusive) and bound (exclusive). bound must be greater than 0.
val nativeint : Nativeint.t -> Nativeint.tRandom.nativeint bound returns a random integer between 0 (inclusive) and bound (exclusive). bound must be greater than 0.
Random.int64 bound returns a random integer between 0 (inclusive) and bound (exclusive). bound must be greater than 0.
The functions from module State manipulate the current state of the random generator explicitly. This allows using one or several deterministic PRNGs, even in a multi-threaded program, without interference from other parts of the program.
module State = Random.Stateval get_state : unit -> State.tReturn the current state of the generator used by the basic functions.
val set_state : State.t -> unitSet the state of the generator used by the basic functions.
include module type of struct include CCRandom endtype state = Random.State.ttype 'a t = state -> 'aRandom generator for values of type 'a
type 'a random_gen = 'a tval return : 'a -> 'a treturn x is the generator that always returns x. Example: let random_int = return 4 (* fair dice roll *)
Delay evaluation. Useful for side-effectful generators that need some code to run for every call. Example:
let gensym = let r = ref 0 in fun () -> incr r; !r ;;
delay (fun () ->
let name = gensym() in
small_int >>= fun i -> return (name,i)
)val choose_return : 'a list -> 'a tChoose among the list
replace n g makes a list of n elements which are all generated randomly using g
val small_int : int tval int : int -> int tval int_range : int -> int -> int tInclusive range
val small_float : float tA reasonably small float.
val float : float -> float tRandom float within the given range
val float_range : float -> float -> float tInclusive range. float_range a b assumes a < b.
val split : int -> (int * int) option tSplit a positive value n into n1,n2 where n = n1 + n2.
val split_list : int -> len:int -> int list option tSplit a value n into a list of values whose sum is n and whose length is length.
retry g calls g until it returns some value, or until the maximum number of retries was reached. If g fails, then it counts for one iteration, and the generator retries.
try_successively l tries each generator of l, one after the other. If some generator succeeds its result is returned, else the next generator is tried
a <?> b is a choice operator. It first tries a, and returns its result if successful. If a fails, then b is returned.
val fix :
?sub1:('a t -> 'a t) list ->
?sub2:('a t -> 'a t -> 'a t) list ->
?subn:(int t * ('a list t -> 'a t)) list ->
base:'a t ->
int t ->
'a tRecursion combinators, for building recursive values. The integer generator is used to provide fuel. The sub_ generators should use their arguments only once!
val pure : 'a -> 'a t