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

A concept matching all external quantities like types

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename T>
concept QuantityLike = !Quantity<T> && detail::QuantityLikeImpl<T, quantity_like_traits> && requires {
  typename quantity<quantity_like_traits<T>::reference, typename quantity_like_traits<T>::rep>;
};
----

== Description

Satisfied by all external types (not‐defined in mp‐units) that via a `quantity_like_traits` provide all quantity‐specific information.


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