[#InsecureRandomContext-rand_exp_duration]
= xref:InsecureRandomContext.adoc[InsecureRandomContext]::rand_exp_duration
:relfileprefix: ../
:mrdocs:

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.

== Synopsis

Declared in `<random.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::chrono::microseconds
rand_exp_duration(std::chrono::microseconds mean) noexcept;
----

== Description

The probability of an event occurring before time x is 1 ‐ eˆ‐(x/a) where a is the average interval between events.

== Return Value

A duration sampled from an exponential distribution with the given mean.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *mean*
| The average interval between events.
|===


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