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

Returns this quantity re‐expressed with another representation type, applying an explicit rounding policy.

== Synopsis

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

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

== Return Value

The equivalent quantity with representation type `ToRep`.

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

[cols="1,4"]
|===
| Name| Description
| *policy*
| the rounding policy to apply when the conversion is not exact
|===


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