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std/math/rand ​

Index ​

fn NewSource(seed: u64): Source
trait Source
struct Rand
    static fn New(src: Source): &Rand
    fn U64(self): u64
    fn U32(self): u32
    fn I64(self): i64
    fn I32(self): i32
    fn Int(self): int
    fn U64n(self, n: u64): u64
    fn I64n(self, n: i64): i64
    fn I32n(self, n: i32): i32
    fn U32n(self, n: u32): u32
    fn Intn(self, n: int): int
    fn Uintn(self, n: uint): uint
    fn F64(self): f64
    fn F32(self): f32

NewSource ​

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fn NewSource(seed: u64): Source

Returns new default source by seed.

The order and numbers produced vary depending on the seed. Since PRNGs are inherently deterministic, using a fixed seed means your program will generate the same numbers every time.

If you want to achieve randomness somehow, use a variable seed. A simple solution for seeds that will create the illusion of randomness is to use time. Unix-time seconds would be a simple seed solution.

Source ​

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trait Source {
	fn U64(self): u64
}

Source of uniformly-distributed pseudo-random u64 values in the range [0, 1<<64). It is not safe for concurrent use by multiple threads.

Rand ​

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struct Rand {
	// NOTE: contains filtered hidden or unexported fields
}

Implements a type of pseudo random number generator (PRNG). Outputs might be easily predictable regardless of how it's seeded. For random numbers suitable for security-sensitive work, it is not recommended.

New ​

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static fn New(src: Source): &Rand

Returns new Rand that uses random values from src to generate other random values.

U64 ​

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fn U64(self): u64

Returns a pseudo-random 64-bit value as u64.

U32 ​

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fn U32(self): u32

Returns a pseudo-random 32-bit value as u32.

I64 ​

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fn I64(self): i64

Returns a non-negative pseudo-random 64-bit value as i64.

I32 ​

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fn I32(self): i32

Returns a non-negative pseudo-random 32-bit value as i32.

Int ​

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fn Int(self): int

Returns a non-negative pseudo-random int.

U64n ​

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fn U64n(self, n: u64): u64

Returns, as a u64, a non-negative pseudo-random number in the half-open interval [0,n). It panics if n == 0.

I64n ​

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fn I64n(self, n: i64): i64

Returns, as an i64, a non-negative pseudo-random number in the half-open interval [0,n). It panics if n == 0.

I32n ​

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fn I32n(self, n: i32): i32

Returns, as an i32, a non-negative pseudo-random number in the half-open interval [0,n). It panics if n <= 0.

U32n ​

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fn U32n(self, n: u32): u32

Returns, as a u32, a non-negative pseudo-random number in the half-open interval [0,n). It panics if n == 0.

Intn ​

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fn Intn(self, n: int): int

Returns, as an int, a non-negative pseudo-random number in the half-open interval [0,n). It panics if n <= 0.

Uintn ​

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fn Uintn(self, n: uint): uint

Returns, as a uint, a non-negative pseudo-random number in the half-open interval [0,n). It panics if n == 0.

F64 ​

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fn F64(self): f64

Returns, as a f64, a pseudo-random number in the half-open interval [0.0,1.0).

F32 ​

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fn F32(self): f32

Returns, as a f32, a pseudo-random number in the half-open interval [0.0,1.0).