[#mp_units-is_kind-06]
= xref:mp_units.adoc[mp_units]::is_kind
:relfileprefix: ../
:mrdocs:

Tag property marking a `quantity_spec` as the start of a new hierarchy tree of a kind

== Synopsis

Declared in `<mp‐units/framework/quantity_spec_definitions.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct is_kind;
----


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