[#mp_units-dimensionless-0f]
= xref:mp_units.adoc[mp&lowbar;units]::dimensionless
:relfileprefix: ../
:mrdocs:

Quantity of dimension one

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct dimensionless
    : xref:mp_units/quantity_spec-09.adoc[mp&lowbar;units::quantity&lowbar;spec&lt;derived&lowbar;quantity&lowbar;spec&lt;&gt;&lcub;&rcub;&gt;]
----

== Description

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

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:mp_units/quantity_spec-09.adoc[mp&lowbar;units::quantity&lowbar;spec&lt;derived&lowbar;quantity&lowbar;spec&lt;&gt;&lcub;&rcub;&gt;]`
| A specification of a quantity used to define its kind, dimension, and character
|===


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