[#BloombergLP-bslfmt-visit_format_arg]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslfmt.adoc[bslfmt]::visit_format_arg
:relfileprefix: ../../
:mrdocs:

Invoke the specified `visitor` functor on the value contained by the specified `arg`, providing that functor non‐modifiable access to that value. `visitor` must be a `variant`‐style functor that is able to visit all supported types listed in the {DESCRIPTION}.

== Synopsis

Declared in `<bslfmt_format_arg.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class t_VISITOR,
    class t_CONTEXT>
decltype(auto)
visit_format_arg(
    t_VISITOR&& visitor,
    xref:BloombergLP/bslfmt/basic_format_arg-0d.adoc[basic_format_arg<t_CONTEXT>] arg);
----


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