[#mp_units-quantity_spec-0a6]
= xref:mp_units.adoc[mp_units]::xref:mp_units/quantity_spec-09.adoc[quantity_spec]<QS, Args...>
:relfileprefix: ../
:mrdocs:

Specialization defining a base quantity

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    /* implementation-defined */ auto Dim,
    /* implementation-defined */ auto Args...>
struct xref:mp_units/quantity_spec-09.adoc[quantity_spec]<QS, Args...>
    : /* implementation-defined */
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `/* implementation-defined */`
| 
|===

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:mp_units/quantity_spec-0a6/_base_type_.adoc[`_base_type_`] 
| The base type used to detect specializations of `quantity_spec`
|===


== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:mp_units/quantity_spec-0a6/operator_call-0a.adoc[`operator()`] 
| Function call operators
| xref:mp_units/quantity_spec-0a6/operator_subs.adoc[`operator[]`] 
| 
|===


== Static Data Members

[cols="1,4"]
|===
| Name| Description
| xref:mp_units/quantity_spec-0a6/_character_.adoc[`_character_`] 
| The character of the quantity, real scalar unless overriden in `Args`
| xref:mp_units/quantity_spec-0a6/_dimension_.adoc[`_dimension_`] 
| The base dimension this quantity specification was defined from
| xref:mp_units/quantity_spec-0a6/_equation_.adoc[`_equation_`] 
| The quantity equation this specification was derived from
| xref:mp_units/quantity_spec-0a6/_is_non_negative_.adoc[`_is_non_negative_`] 
| Whether quantities of this specification can never hold a negative value
| xref:mp_units/quantity_spec-0a6/_parent_.adoc[`_parent_`] 
| The parent quantity specification this leaf was derived from
| xref:mp_units/quantity_spec-0a6/character.adoc[`character`]  [.small]#[deprecated]#
| Deprecated accessor for `_character_`; use `get_character(qs)` instead
| xref:mp_units/quantity_spec-0a6/dimension.adoc[`dimension`]  [.small]#[deprecated]#
| Deprecated accessor for `_dimension_`; use `get_dimension(qs)` instead
|===



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