[#fmt-formatter-09]
= xref:fmt.adoc[fmt]::formatter&lt;&sol;&ast; implementation-defined &ast;&sol;&gt;
:relfileprefix: ../
:mrdocs:

Formats an `errc&lowbar;format&lowbar;as` tag for use with `fmt`&period;

== Synopsis

Declared in `&lt;folly&sol;result&sol;errc&lowbar;rich&lowbar;error&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;&gt;
struct formatter&lt;&sol;&ast; implementation-defined &ast;&sol;&gt;;
----

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:fmt/formatter-09/format.adoc[`format`] 
| Formats the error code into the output&period;
| xref:fmt/formatter-09/parse.adoc[`parse`] 
| Parses the format specification&period;
|===



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