[#fmt-formatter-047]
= xref:fmt.adoc[fmt]::formatter<xref:folly/rich_ptr_to_underlying_error.adoc[folly::rich_ptr_to_underlying_error<Ex>]>
:relfileprefix: ../
:mrdocs:

`fmt::format` support for the pointer‐like returned by `get_exception<Ex>()`.

== Synopsis

Declared in `<folly/result/rich_error_base.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename Ex>
struct formatter<xref:folly/rich_ptr_to_underlying_error.adoc[folly::rich_ptr_to_underlying_error<Ex>]>;
----

== Description

Format pointer‐like returned by `get_exception<Ex>(rich_exception_ptr)`. Crucially, this displays `epitaph()` stacks when available.

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:fmt/formatter-047/format.adoc[`format`] 
| Formats `p` (and any epitaph stack) into the output of `ctx`.
| xref:fmt/formatter-047/parse.adoc[`parse`] 
| Parses the format spec, delegating to `Ex`'s formatter when applicable.
|===



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