[#RPCArg-Fallback]
= xref:RPCArg.adoc[RPCArg]::Fallback
:relfileprefix: ../
:mrdocs:

The argument's default: an optionality marker, a default hint, or a default value.

== Synopsis

Declared in `<rpc/util.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
using Fallback = std::variant<Optional, DefaultHint, Default>;
----


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