[#mp_units-get_quantity_spec-03]
= xref:mp_units.adoc[mp_units]::get_quantity_spec
:relfileprefix: ../
:mrdocs:

`get_quantity_spec` overloads

== Synopses

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

Returns the quantity specification of a reference


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[nodiscard]]
consteval
xref:mp_units/QuantitySpec.adoc[QuantitySpec] auto
xref:mp_units/get_quantity_spec-0f.adoc[get_quantity_spec](xref:mp_units/reference-0b2.adoc[reference] r);
----

[.small]#xref:mp_units/get_quantity_spec-0f.adoc[_» more..._]#

Returns the quantity specification of a reference whose `Q` is marked `final`


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[deprecated("2.6.0: `Q` definition should not be marked `final`"), nodiscard]]
consteval
xref:mp_units/QuantitySpec.adoc[QuantitySpec] auto
xref:mp_units/get_quantity_spec-004.adoc[get_quantity_spec](xref:mp_units/reference-0b2.adoc[reference] r)
requires std::is_final_v<Q>;
----

[.small]#xref:mp_units/get_quantity_spec-004.adoc[_» more..._]#


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:mp_units/PointOrigin.adoc[PointOrigin] PO>
[[nodiscard]]
consteval
xref:mp_units/QuantitySpec.adoc[QuantitySpec] auto
xref:mp_units/get_quantity_spec-0ca7.adoc[get_quantity_spec](PO po);
----

[.small]#xref:mp_units/get_quantity_spec-0ca7.adoc[_» more..._]#


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:mp_units/PointOrigin.adoc[PointOrigin] PO>
[[nodiscard]]
consteval
xref:mp_units/QuantitySpec.adoc[QuantitySpec] auto
xref:mp_units/get_quantity_spec-05.adoc[get_quantity_spec](PO po);
----

[.small]#xref:mp_units/get_quantity_spec-05.adoc[_» more..._]#


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:mp_units/Unit.adoc[Unit] U>
requires std::is_final_v<decltype(detail::get_associated_quantity(U{}))>
[[deprecated("2.6.0: `quantity_spec` definition of `U` should not be marked `final`"), nodiscard]]
consteval
xref:mp_units/QuantitySpec.adoc[QuantitySpec] auto
xref:mp_units/get_quantity_spec-08.adoc[get_quantity_spec](U);
----

[.small]#xref:mp_units/get_quantity_spec-08.adoc[_» more..._]#


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:mp_units/Unit.adoc[Unit] U>
requires std::is_final_v<decltype(detail::get_associated_quantity(U{}))>
[[deprecated("2.6.0: `quantity_spec` definition of `U` should not be marked `final`"), nodiscard]]
consteval
xref:mp_units/QuantitySpec.adoc[QuantitySpec] auto
xref:mp_units/get_quantity_spec-01.adoc[get_quantity_spec](U);
----

[.small]#xref:mp_units/get_quantity_spec-01.adoc[_» more..._]#


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:mp_units/Unit.adoc[Unit] U>
requires std::is_final_v<decltype(detail::get_associated_quantity(U{}))>
[[deprecated("2.6.0: `quantity_spec` definition of `U` should not be marked `final`"), nodiscard]]
consteval
xref:mp_units/QuantitySpec.adoc[QuantitySpec] auto
xref:mp_units/get_quantity_spec-0ca6.adoc[get_quantity_spec](U);
----

[.small]#xref:mp_units/get_quantity_spec-0ca6.adoc[_» more..._]#


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:mp_units/Unit.adoc[Unit] U>
requires std::is_final_v<decltype(detail::get_associated_quantity(U{}))>
[[deprecated("2.6.0: `quantity_spec` definition of `U` should not be marked `final`"), nodiscard]]
consteval
xref:mp_units/QuantitySpec.adoc[QuantitySpec] auto
xref:mp_units/get_quantity_spec-00a.adoc[get_quantity_spec](U);
----

[.small]#xref:mp_units/get_quantity_spec-00a.adoc[_» more..._]#


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:mp_units/Unit.adoc[Unit] U>
requires std::is_final_v<decltype(detail::get_associated_quantity(U{}))>
[[deprecated("2.6.0: `quantity_spec` definition of `U` should not be marked `final`"), nodiscard]]
consteval
xref:mp_units/QuantitySpec.adoc[QuantitySpec] auto
xref:mp_units/get_quantity_spec-060.adoc[get_quantity_spec](U);
----

[.small]#xref:mp_units/get_quantity_spec-060.adoc[_» more..._]#


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<xref:mp_units/Unit.adoc[Unit] U>
requires std::is_final_v<decltype(detail::get_associated_quantity(U{}))>
[[deprecated("2.6.0: `quantity_spec` definition of `U` should not be marked `final`"), nodiscard]]
consteval
xref:mp_units/QuantitySpec.adoc[QuantitySpec] auto
xref:mp_units/get_quantity_spec-068.adoc[get_quantity_spec](U);
----

[.small]#xref:mp_units/get_quantity_spec-068.adoc[_» more..._]#

== Return Value

the quantity specification `Q`

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

[cols="1,4"]
|===
| Name| Description
| *r*
| the reference to query
|===


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