[#mp_units-utility-detail-dynamic_spec_id_handler-on_index]
= xref:mp_units.adoc[mp_units]::xref:mp_units/utility.adoc[utility]::xref:mp_units/utility/detail.adoc[detail]::xref:mp_units/utility/detail/dynamic_spec_id_handler.adoc[dynamic_spec_id_handler]::on_index
:relfileprefix: ../../../../
:mrdocs:

== Synopsis

Declared in `<mp‐units/utility/format.h>`

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


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