module Random: Random
Basic functions
Note that all of these "basic" functions mutate a global random state.
val init : int -> unit
Initialize the generator, using the argument as a seed. The same seed will always
yield the same sequence of numbers.
val full_init : int array -> unit
Same as Random.init
but takes more data as seed.
val self_init : unit -> unit
Initialize the generator with a more-or-less random seed chosen in a system-dependent
way.
val bits : unit -> int
Return 30 random bits in a nonnegative integer.
Before 3.12.0 used a different
algorithm (affects all the following functions)
val int : int -> int
Random.int bound
returns a random integer between 0 (inclusive) and bound
(exclusive). bound
must be greater than 0 and less than 230.
val int32 : Int32.t -> Int32.t
Random.int32 bound
returns a random integer between 0 (inclusive) and bound
(exclusive). bound
must be greater than 0.
val nativeint : Nativeint.t -> Nativeint.t
Random.nativeint bound
returns a random integer between 0 (inclusive) and bound
(exclusive). bound
must be greater than 0.
val int64 : Int64.t -> Int64.t
Random.int64 bound
returns a random integer between 0 (inclusive) and bound
(exclusive). bound
must be greater than 0.
val float : float -> float
Random.float bound
returns a random floating-point number between 0 (inclusive) and
bound
(exclusive). If bound
is negative, the result is negative or zero. If
bound
is 0, the result is 0.
val bool : unit -> bool
Random.bool ()
returns true
or false
with probability 0.5 each.
Advanced functions
module State: sig
.. end
The functions from module State
manipulate the current state
of the random generator explicitely.
val get_state : unit -> [ `Consider_using_Random_State_default ]
OCaml's Random.get_state
makes a copy of the default state, which is almost
certainly not what you want. State.default
, which is the actual default state, is
probably what you want.
val set_state : State.t -> unit
Set the state of the generator used by the basic functions.