[#mp_units-kind_of_-00]
= xref:mp_units.adoc[mp_units]::kind_of_
:relfileprefix: ../
:mrdocs:

The type of a quantity kind for the quantity specification `Q`

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename Q>
struct kind_of_;
----

== Description

A quantity kind encompasses the entire hierarchy tree that `Q` belongs to, rather than just `Q` itself.

== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:mp_units/kind_of_-0d.adoc[`kind_of_<Q>`] 
| Specialization defining the quantity kind of the hierarchy tree rooted at `Q`
|===


== Template Parameters

[cols="1,4"]
|===
| Name| Description
| *Q*
| the root quantity specification of the kind
|===


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