[#mp_units-named_constant-03]
= xref:mp_units.adoc[mp&lowbar;units]::named&lowbar;constant
:relfileprefix: ../
:mrdocs:

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template&lt;
    xref:mp_units/symbol_text-032.adoc[symbol&lowbar;text] Symbol,
    xref:mp_units/Unit.adoc[Unit] auto U,
    auto&period;&period;&period;&gt;
struct named&lowbar;constant;
----

== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:mp_units/named_constant-00.adoc[`named&lowbar;constant&lt;Symbol, U, SU&gt;`] 
| Specialization for a measured constant declaring its absolute standard uncertainty
| xref:mp_units/named_constant-02.adoc[`named&lowbar;constant&lt;Symbol, U, RSU&gt;`] 
| Specialization for a measured constant declaring its relative standard uncertainty
| xref:mp_units/named_constant-0a.adoc[`named&lowbar;constant&lt;Symbol, U&gt;`] 
| Named constant definition
|===


== Derived Classes

[cols="1,4"]
|===
| Name| Description
| xref:mp_units/pi-0c.adoc[`pi`] 
| 
|===


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