Roland Conybeare
d1fa15f248
git-subtree-dir: xo-unit git-subtree-mainline:e9ee6992cagit-subtree-split:b531e382c2
109 lines
2.2 KiB
ReStructuredText
109 lines
2.2 KiB
ReStructuredText
.. _natural-unit-class:
|
|
|
|
Natural Unit
|
|
============
|
|
|
|
A natural unit represents a product of terms, each involving a distinct basis dimension
|
|
|
|
Context
|
|
-------
|
|
|
|
.. ditaa::
|
|
:--scale: 0.85
|
|
|
|
+----------------+---------------+
|
|
| quantity | xquantity |
|
|
+----------------+---------------+
|
|
| scaled_unit |
|
|
+--------------------------------+
|
|
|cBLU natural_unit |
|
|
+--------------------------------+
|
|
| bpu |
|
|
+----------------+ |
|
|
| bu_store | |
|
|
+----------------+---------------+
|
|
| basis_unit |
|
|
+--------------------------------+
|
|
| dimension |
|
|
+--------------------------------+
|
|
|
|
Introduction
|
|
------------
|
|
|
|
.. code-block:: cpp
|
|
|
|
#include <xo/unit/natural_unit.hpp>
|
|
|
|
Representation for the unit associated with a :doc:`xquantity<xquantity-class>`
|
|
|
|
- represents a cartesian product of basis units.
|
|
- constexpr implementation
|
|
- limited support for fractional dimensions such as time^-1/2
|
|
|
|
.. uml::
|
|
:caption: natural unit for a Newton (unit of force)
|
|
:scale: 99%
|
|
:align: center
|
|
|
|
object newton<<natural_unit>>
|
|
newton : n_bpu = 3
|
|
newton : bpu_v[]
|
|
|
|
object kg<<bpu>>
|
|
kg : native_dim = dim::mass
|
|
kg : scalefactor = 1000/1
|
|
kg : power = 1/1
|
|
|
|
object m<<bpu>>
|
|
m : native_dim = dim::distance
|
|
m : scalefactor = 1/1
|
|
m : power = 1/1
|
|
|
|
object s2<<bpu>>
|
|
s2 : native_dim = dim::time
|
|
s2 : scalefactor = 1/1
|
|
s2 : power = -2/1
|
|
|
|
newton o-- kg
|
|
newton o-- m
|
|
newton o-- s2
|
|
|
|
Class
|
|
-----
|
|
|
|
.. doxygenclass:: xo::qty::natural_unit
|
|
|
|
Member Variables
|
|
----------------
|
|
|
|
.. doxygengroup:: natural-unit-instance-vars
|
|
|
|
Type Traits
|
|
-----------
|
|
|
|
.. doxygengroup:: natural-unit-type-traits
|
|
|
|
Constructors
|
|
------------
|
|
|
|
.. doxygengroup:: natural-unit-ctors
|
|
|
|
Access Methods
|
|
--------------
|
|
|
|
.. doxygengroup:: natural-unit-access-methods
|
|
|
|
General Methods
|
|
---------------
|
|
|
|
.. doxygengroup:: natural-unit-methods
|
|
|
|
Conversion
|
|
----------
|
|
|
|
.. doxygengroup:: natural-unit-conversion-methods
|
|
|
|
Comparison Functions
|
|
--------------------
|
|
|
|
.. doxygengroup:: natural-unit-comparison-functions
|