[#FB_VA_GLUE]
= FB&lowbar;VA&lowbar;GLUE
:mrdocs:

Concatenate two preprocessor tokens by juxtaposition, forcing an extra expansion pass&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
#define FB&lowbar;VA&lowbar;GLUE(a, b)

----

== Description

MSVC&apos;s preprocessor is a pain, so we have to forcefully expand the VA args in some places&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| The first token&period;
| *b*
| The second token, placed after `a&period;`
|===


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