[#mp_units-dimensionless-0f]
= xref:mp_units.adoc[mp_units]::dimensionless
:relfileprefix: ../
:mrdocs:

Quantity of dimension one

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct dimensionless final
    : xref:mp_units/quantity_spec-09.adoc[mp_units::quantity_spec<derived_quantity_spec<>{}>]
----

== Base Classes

[cols=2]
|===
| Name
| Description
| `xref:mp_units/quantity_spec-09.adoc[mp_units::quantity_spec<derived_quantity_spec<>{}>]`
| 
|===

== Description

Quantity of dimension one also commonly named as "dimensionless" is a quantity with a dimension for which all the exponents of the factors corresponding to the base dimensions are zero.


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