[#mp_units-quantity-01-2constructor-0f8]
= xref:mp_units.adoc[mp_units]::xref:mp_units/quantity-01.adoc[quantity]::quantity
:relfileprefix: ../../
:mrdocs:

Constructs a quantity from a numerical value and a reference with an equivalent unit.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:mp_units/Reference-0ba.adoc[Reference] R2>
requires (equivalent(unit, get_unit(R2{})))
[[nodiscard]]
constexpr
quantity(
    xref:mp_units/quantity-01/rep.adoc[rep] val,
    R2 ref);
----

== Return Value

[NOTE]
====
The return value https://en.cppreference.com/cpp/language/attributes/nodiscard[should not be discarded^].
====
== Parameters

[cols="1,4"]
|===
| Name| Description
| *val*
| the numerical value to store
| *ref*
| a reference whose unit is equivalent to `unit`
|===


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