[#mp_units-named_unit-06]
= xref:mp_units.adoc[mp&lowbar;units]::xref:mp_units/named_unit-0ec.adoc[named&lowbar;unit]&lt;Symbol&gt;
:relfileprefix: ../
:mrdocs:

Specialization for a unit that can be reused by several base quantities

== Synopsis

Declared in `&lt;mp&hyphen;units&sol;framework&sol;unit&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;xref:mp_units/symbol_text-032.adoc[symbol&lowbar;text] Symbol&gt;
requires (!Symbol&period;empty())
struct xref:mp_units/named_unit-0ec.adoc[named&lowbar;unit]&lt;Symbol&gt;
    : &sol;&ast; implementation-defined &ast;&sol;
----

== Base Classes

[cols=2]
|===
| Name
| Description
| `&sol;&ast; implementation-defined &ast;&sol;`
| 
|===

== Types

[cols=1]
|===
| Name
| xref:mp_units/named_unit-06/_base_type_.adoc[`&lowbar;base&lowbar;type&lowbar;`] 
|===

== Static Data Members

[cols=2]
|===
| Name
| Description
| xref:mp_units/named_unit-06/_symbol_.adoc[`&lowbar;symbol&lowbar;`] 
| Unique base unit identifier
|===

== Description

This specialization is used in rare cases where more than one base quantity in a specific system of units uses the same unit&period; For example in a hypothetical system of natural units where constant for speed of light `c &equals; 1`, length and time could be measured in seconds&period; In such cases `system&lowbar;reference` has to be used to explicitly express such a binding&period;

== Template Parameters

[cols=2]
|===
| Name
| Description
| *Symbol*
| a short text representation of the unit
|===


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