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

Construct from `rep`

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
explicit(!mp_units::implicitly_convertible(quantity_spec, dimensionless))
quantity(xref:mp_units/quantity-01/rep.adoc[rep] val)
requires detail::ExplicitFromNumber<reference>;
----

== Parameters

[cols="1,4"]
|===
|Name|Description

| *val*
| The object to construct from
|===


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