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

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    xref:mp_units/UnitOf.adoc[UnitOf<quantity_spec>] ToU,
    xref:mp_units/RoundingPolicy.adoc[RoundingPolicy] Policy>
requires detail::ExplicitlyCastable<unit, ToU{}, rep> && detail::ValidRoundingPolicyFor<Policy, rep, rep>
[[nodiscard]]
constexpr
xref:mp_units/QuantityOf.adoc[QuantityOf<quantity_spec>] auto
in(
    ToU,
    Policy policy) const;
----

== Return Value

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

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