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

Public helper that yields the reference (unit + quantity spec) associated with a quantity‐like type.

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<typename T>
constexpr auto reference_for = detail::reference_for_impl<T>::value;
----

== Description

Derived from the type's own `::reference` member (for `quantity` / `quantity_point`) or from `quantity_like_traits<T>` / `quantity_point_like_traits<T>` for external types.

This is *not* a customization point. Users teach the library about external types by specializing `quantity_like_traits` / `quantity_point_like_traits`, not this helper.

== Template Parameters

[cols="1,4"]
|===
|Name|Description

| *T*
| a quantity‐like or quantity‐point‐like type
|===


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