[#mp_units-quantity-03]
= xref:mp_units.adoc[mp_units]::xref:mp_units/quantity-01.adoc[quantity<R, representation_canonical_type_t<Value>>]
:relfileprefix: ../
:mrdocs:

Deduces a `quantity` from a numerical value alone, using the `one` reference by default.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    xref:mp_units/Reference-0ba.adoc[Reference] auto R = one,
    typename Value>
requires RepresentationOf<representation_canonical_type_t<Value>, get_quantity_spec(R)>
xref:mp_units/quantity-01.adoc[quantity<R, representation_canonical_type_t<Value>>](Value) -> xref:mp_units/quantity-01.adoc[quantity<R, representation_canonical_type_t<Value>>];
----

== Template Parameters

[cols="1,4"]
|===
| Name| Description
| *R*
| the reference to use, defaulting to `one`
| *Value*
| the numerical value type
|===


[.small]#Created with https://www.mrdocs.com[MrDocs]#