[#FB_ARG_1]
= FB&lowbar;ARG&lowbar;1
:mrdocs:

Helper macro that extracts the first argument out of a list of any number of arguments&period;

== Synopsis

Declared in `&lt;folly&sol;Preprocessor&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
#define FB&lowbar;ARG&lowbar;1(a, ...)

----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| The first argument, which is returned&period;
|===


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