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

The tensor order axis of a quantity's character

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
enum class quantity_tensor_order : int8_t;
----

== Description

A quantity's character splits into two orthogonal axes: its _tensor order_ (scalar, vector, tensor) and its _numeric field_ (real, complex). The enumerators are declared in increasing rank so that the underlying comparison orders them (scalar < vector < tensor, real < complex).

== Members

[cols="1,4"]
|===
| Name| Description
| `scalar` 
| A quantity with magnitude but no direction.
| `vector` 
| A quantity with both magnitude and direction.
| `tensor` 
| A quantity that additionally carries orientation (e.g. the Cauchy stress tensor).
|===



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