[#mp_units-named_unit-05]
= xref:mp_units.adoc[mp_units]::xref:mp_units/named_unit-0ec.adoc[named_unit]<Symbol, U, QS>
:relfileprefix: ../
:mrdocs:

Specialization for a unit with special name valid only for a specific quantity

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    xref:mp_units/symbol_text-032.adoc[symbol_text] Symbol,
    xref:mp_units/Unit.adoc[Unit] auto QS,
    /* implementation-defined */ auto PO>
requires (!Symbol.empty()) && (QS.dimension == detail::get_associated_quantity(U).dimension) &&
          detail::is_positive_canonical_unit_mag<U>
struct xref:mp_units/named_unit-0ec.adoc[named_unit]<Symbol, U, QS>
    : /* implementation-defined */
----

== Description

The same as the above but additionally limits the usage of this unit to provided quantities.

== Base Classes

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

| `/* implementation-defined */`
| 
|===

== Types

[cols=1]
|===
| Name
| xref:mp_units/named_unit-05/_base_type_.adoc[`_base_type_`] 
|===

== Static Data Members

[cols="1,4"]
|===
| Name| Description
| xref:mp_units/named_unit-05/_point_origin_.adoc[`_point_origin_`] 
| 
| xref:mp_units/named_unit-05/_quantity_spec_.adoc[`_quantity_spec_`] 
| 
| xref:mp_units/named_unit-05/_symbol_.adoc[`_symbol_`] 
| Unique base unit identifier
|===

== Template Parameters

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

| *Symbol*
| a short text representation of the unit
| *Unit*
| a unit for which we provide a special name
| *QuantitySpec*
| a specification of a quantity to be measured with this unit
|===


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