[#mp_units-quantity_spec-0a6-operator_call]
= 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,
    typename FwdQ,
    xref:mp_units/Quantity.adoc[Quantity] Q = std::remove_cvref_t<FwdQ>>
requires (mp_units::explicitly_convertible(Q::quantity_spec, Self{}))
[[nodiscard]]
constexpr
xref:mp_units/Quantity.adoc[Quantity] auto
operator()(this 
    Self,
    FwdQ&& q);
----


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