[#absl-Exponential]
= xref:absl.adoc[absl]::Exponential
:relfileprefix: ../
:mrdocs:

Produces a floating point value from an exponential distribution.

== Synopsis

Declared in `<absl/random/distributions.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename RealType,
    typename URBG>
RealType
Exponential(
    URBG&& urbg,
    RealType lambda = 1);
----

== Description

`absl::Exponential` produces a floating point number representing the distance (time) between two consecutive events in a point process of events occurring continuously and independently at a constant average rate `lambda`. `T` must be a floating point type, but may be inferred from the type of `lambda`.

The mean of the distribution is 1/`lambda`.

See https://en.wikipedia.org/wiki/Exponential_distribution.

Example:

absl::BitGen bitgen; ... double call_length = absl::Exponential(bitgen, 7.0);

== Return Value

A random value drawn from the exponential distribution.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *urbg*
| The uniform random bit generator.
| *lambda*
| The constant average rate of events.
|===


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