Random

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The Random trait should be implemented by all random number generators. The only method you need to implement is fun ref next(): 64. Once that method has been implemented, the Random trait provides default implementations of conversions to other number types.

trait ref Random

Constructors

create

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Create with the specified seed. Returned values are deterministic for a given seed.

new ref create(
  x: U64 val = 5489,
  y: U64 val = 0)
: Random ref^

Parameters

• x: U64 val = 5489
• y: U64 val = 0

Returns

• Random ref^

Public Functions

has_next

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If used as an iterator, this always has another value.

fun tag has_next()
: Bool val

Returns

• Bool val

next

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A random integer in [0, 2^64)

fun ref next()
: U64 val

Returns

• U64 val

u8

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A random integer in [0, 2^8)

fun ref u8()
: U8 val

Returns

• U8 val

u16

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A random integer in [0, 2^16)

fun ref u16()
: U16 val

Returns

• U16 val

u32

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A random integer in [0, 2^32)

fun ref u32()
: U32 val

Returns

• U32 val

u64

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A random integer in [0, 2^64)

fun ref u64()
: U64 val

Returns

• U64 val

u128

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A random integer in [0, 2^128)

fun ref u128()
: U128 val

Returns

• U128 val

ulong

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A random integer in [0, ULong.max_value()]

fun ref ulong()
: ULong val

Returns

• ULong val

usize

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A random integer in [0, USize.max_value()]

fun ref usize()
: USize val

Returns

• USize val

i8

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A random integer in [-2^7, 2^7)

fun ref i8()
: I8 val

Returns

• I8 val

i16

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A random integer in [-2^15, 2^15)

fun ref i16()
: I16 val

Returns

• I16 val

i32

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A random integer in [-2^31, 2^31)

fun ref i32()
: I32 val

Returns

• I32 val

i64

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A random integer in [-2^63, 2^63)

fun ref i64()
: I64 val

Returns

• I64 val

i128

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A random integer in [-2^127, 2^127)

fun ref i128()
: I128 val

Returns

• I128 val

ilong

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A random integer in [ILong.min_value(), ILong.max_value()]

fun ref ilong()
: ILong val

Returns

• ILong val

isize

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A random integer in [ISize.min_value(), ISize.max_value()]

fun ref isize()
: ISize val

Returns

• ISize val

int_fp_mult[optional N: ((U8 val | U16 val | U32 val | U64 val | U128 val | ULong val | USize val) & Real[N] val)]

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A random integer in [0, n)

fun ref int_fp_mult[optional N: ((U8 val | U16 val | U32 val | 
    U64 val | U128 val | ULong val | 
    USize val) & Real[N] val)](
  n: N)
: N

Parameters

• n: N

Returns

• N

int[optional N: ((U8 val | U16 val | U32 val | U64 val | U128 val | ULong val | USize val) & Real[N] val)]

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A random integer in [0, n)

Uses fixed-point inversion if platform supports native 128 bit operations otherwise uses floating-point multiplication.

fun ref int[optional N: ((U8 val | U16 val | U32 val | 
    U64 val | U128 val | ULong val | 
    USize val) & Real[N] val)](
  n: N)
: N

Parameters

• n: N

Returns

• N

int_unbiased[optional N: ((U8 val | U16 val | U32 val | U64 val | U128 val | ULong val | USize val) & Real[N] val)]

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A random integer in [0, n)

Not biased with small values of n like int.

fun ref int_unbiased[optional N: ((U8 val | U16 val | U32 val | 
    U64 val | U128 val | ULong val | 
    USize val) & Real[N] val)](
  n: N)
: N

Parameters

• n: N

Returns

• N

real

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A random number in [0, 1)

fun ref real()
: F64 val

Returns

• F64 val

shuffle[A: A]

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Shuffle the elements of the array into a random order, mutating the array.

fun ref shuffle[A: A](
  array: Array[A] ref)
: None val

Parameters

• array: Array[A] ref

Returns

• None val