Struct rand_core::block::BlockRng64

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pub struct BlockRng64<R: BlockRngCore + ?Sized> {
    pub core: R,
    /* private fields */
}
Expand description

A wrapper type implementing RngCore for some type implementing BlockRngCore with u64 array buffer; i.e. this can be used to implement a full RNG from just a generate function.

This is similar to BlockRng, but specialized for algorithms that operate on u64 values.

No whole generated u64 values are thrown away and all values are consumed in-order. next_u64 simply takes the next available u64 value. next_u32 is however a bit special: half of a u64 is consumed, leaving the other half in the buffer. If the next function called is next_u32 then the other half is then consumed, however both next_u64 and fill_bytes discard the rest of any half-consumed u64s when called.

fill_bytes ] consume a whole number of u64` values. If the requested length is not a multiple of 8, some bytes will be discarded.

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§core: R

The core part of the RNG, implementing the generate function.

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impl<R: BlockRngCore> BlockRng64<R>

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pub fn new(core: R) -> BlockRng64<R>

Create a new BlockRng from an existing RNG implementing BlockRngCore. Results will be generated on first use.

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pub fn index(&self) -> usize

Get the index into the result buffer.

If this is equal to or larger than the size of the result buffer then the buffer is “empty” and generate() must be called to produce new results.

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pub fn reset(&mut self)

Reset the number of available results. This will force a new set of results to be generated on next use.

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pub fn generate_and_set(&mut self, index: usize)

Generate a new set of results immediately, setting the index to the given value.

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impl<R: Clone + BlockRngCore + ?Sized> Clone for BlockRng64<R>
where R::Results: Clone,

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fn clone(&self) -> BlockRng64<R>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<R: BlockRngCore + Debug> Debug for BlockRng64<R>

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fn fmt(&self, fmt: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<'de, R> Deserialize<'de> for BlockRng64<R>
where R: Deserialize<'de> + BlockRngCore + ?Sized, R::Results: Deserialize<'de>,

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fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>
where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer. Read more
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impl<R: BlockRngCore<Item = u64>> RngCore for BlockRng64<R>

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fn next_u32(&mut self) -> u32

Return the next random u32. Read more
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fn next_u64(&mut self) -> u64

Return the next random u64. Read more
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fn fill_bytes(&mut self, dest: &mut [u8])

Fill dest with random data. Read more
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impl<R: BlockRngCore + SeedableRng> SeedableRng for BlockRng64<R>

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type Seed = <R as SeedableRng>::Seed

Seed type, which is restricted to types mutably-dereferenceable as u8 arrays (we recommend [u8; N] for some N). Read more
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fn from_seed(seed: Self::Seed) -> Self

Create a new PRNG using the given seed. Read more
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fn seed_from_u64(seed: u64) -> Self

Create a new PRNG using a u64 seed. Read more
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fn from_rng(rng: impl RngCore) -> Self

Create a new PRNG seeded from an infallible Rng. Read more
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fn try_from_rng<S: TryRngCore>(rng: S) -> Result<Self, S::Error>

Create a new PRNG seeded from a potentially fallible Rng. Read more
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fn from_os_rng() -> Self

Creates a new instance of the RNG seeded via getrandom. Read more
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fn try_from_os_rng() -> Result<Self, Error>

Creates a new instance of the RNG seeded via getrandom without unwrapping potential getrandom errors. Read more
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impl<R> Serialize for BlockRng64<R>

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fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>
where __S: Serializer,

Serialize this value into the given Serde serializer. Read more
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impl<R: CryptoBlockRng + BlockRngCore<Item = u64>> CryptoRng for BlockRng64<R>

Auto Trait Implementations§

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impl<R> Freeze for BlockRng64<R>
where <R as BlockRngCore>::Results: Freeze, R: Freeze + ?Sized,

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impl<R> RefUnwindSafe for BlockRng64<R>

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impl<R> Send for BlockRng64<R>
where <R as BlockRngCore>::Results: Send, R: Send + ?Sized,

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impl<R> Sync for BlockRng64<R>
where <R as BlockRngCore>::Results: Sync, R: Sync + ?Sized,

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impl<R> Unpin for BlockRng64<R>
where <R as BlockRngCore>::Results: Unpin, R: Unpin + ?Sized,

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impl<R> UnwindSafe for BlockRng64<R>

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> DeserializeOwned for T
where T: for<'de> Deserialize<'de>,