Struct rand::rngs::ThreadRng
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pub struct ThreadRng { /* fields omitted */ }
The type returned by thread_rng
, essentially just a reference to the
PRNG in thread-local memory.
ThreadRng
uses ReseedingRng
wrapping the same PRNG as StdRng
,
which is reseeded after generating 32 MiB of random data. A single instance
is cached per thread and the returned ThreadRng
is a reference to this
instance — hence ThreadRng
is neither Send
nor Sync
but is safe to use
within a single thread. This RNG is seeded and reseeded via EntropyRng
as required.
Note that the reseeding is done as an extra precaution against entropy
leaks and is in theory unnecessary — to predict ThreadRng
's output, an
attacker would have to either determine most of the RNG's seed or internal
state, or crack the algorithm used.
Like StdRng
, ThreadRng
is a cryptographically secure PRNG. The current
algorithm used is HC-128, which is an array-based PRNG that trades memory
usage for better performance. This makes it similar to ISAAC, the algorithm
used in ThreadRng
before rand 0.5.
Cloning this handle just produces a new reference to the same thread-local generator.
Trait Implementations
impl Clone for ThreadRng
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fn clone(&self) -> ThreadRng
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl Debug for ThreadRng
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fn fmt(&self, __arg_0: &mut Formatter) -> Result
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Formats the value using the given formatter. Read more
impl RngCore for ThreadRng
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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 fill_bytes(&mut self, dest: &mut [u8])
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Fill dest
with random data. Read more
fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error>
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Fill dest
entirely with random data. Read more