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

Check that the specified argument index is valid and enter manual indexing mode.

== Synopsis

Declared in `<bslfmt_mockparsecontext.h>`

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

== Description

Throw `bslfmt::format_error` if this object has already entered automatic indexing mode, or if `id` is not less than the number of arguments.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *id*
| argument index to validate
|===


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