[#mp_units-get_common_quantity_spec-0b]
= xref:mp_units.adoc[mp_units]::get_common_quantity_spec
:relfileprefix: ../
:mrdocs:

Returns the common quantity specification of two quantity specifications

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    xref:mp_units/QuantitySpec.adoc[QuantitySpec] Q1,
    xref:mp_units/QuantitySpec.adoc[QuantitySpec] Q2>
requires (detail::have_common_quantity_spec(Q1{}, Q2{}))
[[nodiscard]]
consteval
xref:mp_units/QuantitySpec.adoc[QuantitySpec] auto
get_common_quantity_spec(
    Q1 q1,
    Q2 q2);
----

== Return Value

the strongest quantity specification that both arguments are convertible to

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

[cols="1,4"]
|===
| Name| Description
| *Q1*
| first quantity specification type
| *Q2*
| second quantity specification type
|===

== Parameters

[cols="1,4"]
|===
| Name| Description
| *q1*
| first quantity specification value
| *q2*
| second quantity specification value
|===


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