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

Enter automatic indexing mode and return the next argument index. Throw `bslfmt::format_error` if this object has already entered manual indexing mode.

== Synopsis

Declared in `<bslfmt_mockparsecontext.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
size_t
next_arg_id();
----


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