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

Constructs a seed sequence from variates produced by a bit generator.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename URBG>
xref:absl/SeedSeq.adoc[SeedSeq]
CreateSeedSeqFrom(URBG* urbg);
----

== Description

Constructs a seed sequence conforming to [rand.req.seedseq]using variates produced by a provided bit generator.

You should generally avoid direct construction of seed sequences, but use‐cases for reuse of a seed sequence to construct identical bit generators may be helpful (eg. replaying a simulation whose state is derived from bit generator values).

If `urbg == nullptr`, then behavior is undefined.

Example:

absl::BitGen my_bitgen; auto seed_seq = absl::CreateSeedSeqFrom(&my_bitgen); absl::BitGen new_engine(seed_seq); // derived from my_bitgen, but not // correlated.

== Return Value

A seed sequence derived from the bit generator.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *urbg*
| The bit generator used to produce the seed material.
|===


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