[#FastRandomContext]
= FastRandomContext
:mrdocs:

Fast randomness source. This is seeded once with secure random data, but is completely deterministic and does not gather more entropy after that.

== Synopsis

Declared in `<random.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class FastRandomContext
    : public xref:RandomMixin-01.adoc[RandomMixin<FastRandomContext>]
----

== Description

This class is not thread‐safe.

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:RandomMixin-01.adoc[RandomMixin<FastRandomContext>]`
| Mixin class that provides helper randomness functions.
|===

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:FastRandomContext/result_type.adoc[`result_type`] 
| Result type of the generator, for the UniformRandomBitGenerator concept.
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:FastRandomContext/2constructor-0d.adoc[`FastRandomContext`]         [.small]#[constructor]#
| Constructors
| xref:FastRandomContext/operator_assign-04.adoc[`operator=`] 
| Assignment operators
| xref:FastRandomContext/Reseed.adoc[`Reseed`] 
| Reseed with explicit seed (only for testing).
| xref:FastRandomContext/fillrand-0b.adoc[`fillrand`] 
| `fillrand` overloads
| xref:FastRandomContext/operator_call.adoc[`operator()`] 
| Generate the next random value, for the UniformRandomBitGenerator concept.
| xref:FastRandomContext/rand.adoc[`rand`] 
| Generate a random integer in its entire (non‐negative) range.
| xref:FastRandomContext/rand256.adoc[`rand256`] 
| generate a random uint256.
| xref:FastRandomContext/rand32.adoc[`rand32`] 
| Generate a random 32‐bit integer.
| xref:FastRandomContext/rand64.adoc[`rand64`] 
| Generate a random 64‐bit integer.
| xref:FastRandomContext/rand_exp_duration.adoc[`rand_exp_duration`] 
| Return a duration sampled from an exponential distribution (https://en.wikipedia.org/wiki/Exponential_distribution). Successive events whose intervals are distributed according to this form a memoryless Poisson process. This should be used for repeated network events (e.g. sending a certain type of message) to minimize leaking information to observers.
| xref:FastRandomContext/rand_uniform_delay.adoc[`rand_uniform_delay`] 
| Return the time point advanced by a uniform random duration.
| xref:FastRandomContext/rand_uniform_duration.adoc[`rand_uniform_duration`] 
| Generate a uniform random duration in the range from 0 (inclusive) to range (exclusive).
| xref:FastRandomContext/randbits-08.adoc[`randbits`] 
| `randbits` overloads
| xref:FastRandomContext/randbool.adoc[`randbool`] 
| Generate a random boolean.
| xref:FastRandomContext/randbytes-0e.adoc[`randbytes`] 
| `randbytes` overloads
| xref:FastRandomContext/randrange-06.adoc[`randrange`] 
| `randrange` overloads
|===


== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:FastRandomContext/max.adoc[`max`] 
| Largest value the generator can produce.
| xref:FastRandomContext/min.adoc[`min`] 
| Smallest value the generator can produce.
|===


== Protected Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:FastRandomContext/FlushCache.adoc[`FlushCache`] 
| Discard any random bits buffered from a previous rand64() call.
|===



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