[#mp_units-named_unit-06]
= xref:mp_units.adoc[mp_units]::xref:mp_units/named_unit-0ec.adoc[named_unit]<Symbol>
:relfileprefix: ../
:mrdocs:

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

== 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>
requires (!Symbol.empty())
struct xref:mp_units/named_unit-0ec.adoc[named_unit]<Symbol>
    : /* implementation-defined */
----

== Base Classes

[cols=2]
|===
| Name
| Description
| `/* implementation-defined */`
| 
|===

== Types

[cols=1]
|===
| Name
| xref:mp_units/named_unit-06/_base_type_.adoc[`_base_type_`] 
|===

== Static Data Members

[cols=2]
|===
| Name
| Description
| xref:mp_units/named_unit-06/_symbol_.adoc[`_symbol_`] 
| 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. For example in a hypothetical system of natural units where constant for speed of light `c = 1`, length and time could be measured in seconds. In such cases `system_reference` has to be used to explicitly express such a binding.

== Template Parameters

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


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