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

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    xref:mp_units/Reference.adoc[Reference] R1,
    xref:mp_units/Reference.adoc[Reference] R2,
    xref:mp_units/Reference.adoc[Reference]... Rest>
[[nodiscard]]
consteval
xref:mp_units/Reference.adoc[Reference] auto
get_common_reference(
    auto u1,
    auto u2,
    auto... rest)
requires (!(MP_UNITS_ASSOCIATED_UNIT_T(R1) && MP_UNITS_ASSOCIATED_UNIT_T(R2) &&
             (... && MP_UNITS_ASSOCIATED_UNIT_T(Rest)))) &&
          requires {
            get_common_quantity_spec(get_quantity_spec(r1), get_quantity_spec(r2), get_quantity_spec(rest)...);
            get_common_unit(get_unit(r1), get_unit(r2), get_unit(rest)...);
          };
----


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