[#BloombergLP-bslfmt-basic_format_context-arg-02]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslfmt.adoc[bslfmt]::xref:BloombergLP/bslfmt/basic_format_context.adoc[basic_format_context]::arg
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:mrdocs:

Return a `basic_format_arg` type for the argument in the position specified by `id`, with indexing starting at zero. If `id` is not less than the number of contained arguments, a default‐constructed `basic_format_arg` object is returned.

== Synopsis

Declared in `<bslfmt_format_context.h>`

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


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