[#absl-SetFlag-0d]
= xref:absl.adoc[absl]::SetFlag
:relfileprefix: ../
:mrdocs:

Sets the value of an `absl::Flag` to the value `v`. Do not construct an `absl::Flag<T>` directly and call `absl::SetFlag()`; instead, use the flag's variable name (e.g. `FLAGS_name`). This function is thread‐safe, but is potentially expensive. Avoid setting flags in general, but especially within performance‐critical code.

== Synopsis

Declared in `<absl/flags/flag.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename T>
void
SetFlag(
    xref:absl/Flag.adoc[absl::Flag<T>]* flag,
    T const& v);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *flag*
| The flag to update.
| *v*
| The new value to assign to `flag`.
|===


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