[#mp_units-named_constant-03]
= xref:mp_units.adoc[mp_units]::named_constant
:relfileprefix: ../
:mrdocs:

== Synopsis

Declared in `<mp‐units/framework/unit_definitions.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 U,
    auto...>
struct named_constant;
----

== Specializations

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


== Derived Classes

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


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