[#mp_units-quantity-01-numerical_value_in-09]
= xref:mp_units.adoc[mp_units]::xref:mp_units/quantity-01.adoc[quantity]::numerical_value_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>] U,
    xref:mp_units/RoundingPolicy.adoc[RoundingPolicy] Policy>
requires detail::ExplicitlyCastable<unit, U{}, rep> && detail::ValidRoundingPolicyFor<Policy, rep, rep>
[[nodiscard]]
constexpr
xref:mp_units/RepresentationOf.adoc[RepresentationOf<quantity_spec>] auto
numerical_value_in(
    U,
    Policy policy) const noexcept;
----

== Return Value

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

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