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

Construct from `quantity`

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    auto R2,
    typename Rep2>
requires detail::QuantityConstructibleFrom<quantity, quantity<R2, Rep2>> && (!equivalent(unit, get_unit(R2)))
constexpr
explicit(!std::convertible_to<Rep2, rep> || !mp_units::implicitly_convertible(get_quantity_spec(R2), quantity_spec) || !mp_units::implicitly_scalable<get_unit(R2), Rep2, unit, rep>)
quantity(xref:mp_units/quantity-01.adoc[quantity<R2, Rep2>] const& q);
----

== Parameters

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

| *q*
| The object to copy construct from
|===


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