[#mp_units-quantity-057]
= 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 and an explicit reference.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    xref:mp_units/Reference-0ba.adoc[Reference] R,
    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 v,
    R) -> xref:mp_units/quantity-01.adoc[quantity<R{}, representation_canonical_type_t<Value>>];
----

== Template Parameters

[cols="1,4"]
|===
| Name| Description
| *R*
| the reference type
| *Value*
| the numerical value type
|===


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