# Struct rand::IsaacRng [−] [src]

    pub struct IsaacRng { /* fields omitted */ }

A random number generator that uses the ISAAC algorithm[1].

The ISAAC algorithm is generally accepted as suitable for cryptographic purposes, but this implementation has not be verified as such. Prefer a generator like `OsRng` that defers to the operating system for cases that need high security.

[1]: Bob Jenkins, ISAAC: A fast cryptographic random number generator

## Methods

### `impl IsaacRng`
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#### `pub fn new_unseeded() -> IsaacRng`
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Create an ISAAC random number generator using the default fixed seed.

## Trait Implementations

### `impl Copy for IsaacRng`
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### `impl Clone for IsaacRng`
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#### `fn clone(&self) -> IsaacRng`
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Returns a copy of the value. Read more

#### `fn clone_from(&mut self, source: &Self)`
1.0.0
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Performs copy-assignment from `source`. Read more

### `impl Rng for IsaacRng`
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#### `fn next_u32(&mut self) -> u32`
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Return the next random u32. Read more

#### `fn next_u64(&mut self) -> u64`
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Return the next random u64. Read more

#### `fn next_f32(&mut self) -> f32`
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Return the next random f32 selected from the half-open interval `[0, 1)`. Read more

#### `fn next_f64(&mut self) -> f64`
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Return the next random f64 selected from the half-open interval `[0, 1)`. Read more

#### `fn fill_bytes(&mut self, dest: &mut [u8])`
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Fill `dest` with random data. Read more

#### `fn gen<T: Rand>(&mut self) -> T where
Self: Sized,`
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Return a random value of a `Rand` type. Read more

####
ⓘImportant traits for Generator<'a, T, R>

### Important traits for Generator<'a, T, R>

`impl<'a, T: Rand, R: Rng> Iterator for Generator<'a, T, R> type Item = T;`
`fn gen_iter<'a, T: Rand>(&'a mut self) -> Generator<'a, T, Self> where
Self: Sized,`
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Return an iterator that will yield an infinite number of randomly generated items. Read more

#### `fn gen_range<T: PartialOrd + SampleRange>(&mut self, low: T, high: T) -> T where
Self: Sized,`
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Generate a random value in the range [`low`, `high`). Read more

#### `fn gen_weighted_bool(&mut self, n: u32) -> bool where
Self: Sized,`
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Return a bool with a 1 in n chance of true Read more

####
ⓘImportant traits for AsciiGenerator<'a, R>

### Important traits for AsciiGenerator<'a, R>

`impl<'a, R: Rng> Iterator for AsciiGenerator<'a, R> type Item = char;`
`fn gen_ascii_chars<'a>(&'a mut self) -> AsciiGenerator<'a, Self> where
Self: Sized,`
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Return an iterator of random characters from the set A-Z,a-z,0-9. Read more

#### `fn choose<'a, T>(&mut self, values: &'a [T]) -> Option<&'a T> where
Self: Sized,`
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Return a random element from `values`. Read more

#### `fn choose_mut<'a, T>(&mut self, values: &'a mut [T]) -> Option<&'a mut T> where
Self: Sized,`
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Return a mutable pointer to a random element from `values`. Read more

#### `fn shuffle<T>(&mut self, values: &mut [T]) where
Self: Sized,`
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Shuffle a mutable slice in place. Read more

### `impl<'a> SeedableRng<&'a [u32]> for IsaacRng`
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#### `fn reseed(&mut self, seed: &'a [u32])`
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Reseed an RNG with the given seed. Read more

#### `fn from_seed(seed: &'a [u32]) -> IsaacRng`
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Create an ISAAC random number generator with a seed. This can be any length, although the maximum number of elements used is 256 and any more will be silently ignored. A generator constructed with a given seed will generate the same sequence of values as all other generators constructed with that seed.

### `impl Rand for IsaacRng`
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#### `fn rand<R: Rng>(other: &mut R) -> IsaacRng`
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Generates a random instance of this type using the specified source of randomness. Read more

### `impl Debug for IsaacRng`
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#### `fn fmt(&self, f: &mut Formatter) -> Result`
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Formats the value using the given formatter. Read more

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