[#BloombergLP-bslfmt-MockFormatContext-arg-0f]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslfmt.adoc[bslfmt]::xref:BloombergLP/bslfmt/MockFormatContext.adoc[MockFormatContext]::arg
:relfileprefix: ../../../
:mrdocs:

Return the argument with the specified `id` or the default constructed object if there is no argument with such `id`.

== Synopsis

Declared in `<bslfmt_mockformatcontext.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bslfmt/MockFormatContext/Arg-03.adoc[MockFormatContext<t_CHAR>::Arg]
arg(size_t id) const noexcept;
----


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