[#mp_units-quantity-051]
= xref:mp_units.adoc[mp_units]::xref:mp_units/quantity-01.adoc[quantity<quantity_like_traits<Q>::reference, quantity_like_traits<Q>::rep>]
:relfileprefix: ../
:mrdocs:

Deduces a `quantity` from an external quantity‐like type via `quantity_like_traits`.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:mp_units/QuantityLike.adoc[QuantityLike] Q>
xref:mp_units/quantity-01.adoc[quantity<quantity_like_traits<Q>::reference, quantity_like_traits<Q>::rep>](Q) -> xref:mp_units/quantity-01.adoc[quantity<quantity_like_traits<Q>::reference, quantity_like_traits<Q>::rep>];
----

== Template Parameters

[cols="1,4"]
|===
| Name| Description
| *Q*
| the external quantity‐like type
|===


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