[#mp_units-quantity_spec-0a6-operator_subs]
= xref:mp_units.adoc[mp_units]::xref:mp_units/quantity_spec-0a6.adoc[quantity_spec<QS, Args...>]::operator[]
:relfileprefix: ../../
:mrdocs:

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename Self,
    xref:mp_units/UnitOf.adoc[UnitOf<Self{}>] U>
[[nodiscard]]
consteval
xref:mp_units/Reference.adoc[Reference] auto
operator[](this 
    Self,
    U);
----

== Return Value

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

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