[#fmt-formatter-03]
= xref:fmt.adoc[fmt]::formatter<T>
:relfileprefix: ../
:mrdocs:

`fmt::format` support for any type convertible to `rich_error_base*`.

== Synopsis

Declared in `<folly/lang/Strong.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename T>
requires std::is_convertible_v<T*, folly::rich_error_base*>
struct formatter<T>
    : xref:fmt/formatter-063.adoc[fmt::formatter<folly::rich_error_base>]
    , fmt::formatter<T::underlying_type>
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:fmt/formatter-063.adoc[fmt::formatter<folly::rich_error_base>]`
| `fmt::format` support for `rich_error_base` and derived classes.
| `fmt::formatter<T::underlying_type>`
| 
|===

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:fmt/formatter-03/format-0c.adoc[`format`] 
| `format` overloads
| xref:fmt/formatter-03/parse-0b.adoc[`parse`] 
| Parses the format spec (align/fill/padding is not yet supported).
|===



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