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

Return the index of the next‐unused argument. If the indexing mode is unset, the indexing mode is set to `e_AUTOMATIC`. If the indexing mode is `e_MANUAL`, caused by a previous call to `check_arg_id` then an exception of type `format_error` is thrown. If there are no remaining unused arguments then an exception of type `format_error` is thrown.

== Synopsis

Declared in `<bslfmt_formatparsecontext.h>`

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


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