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base_units_ratio description added

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Mateusz Pusz
2020-05-05 21:00:41 +02:00
parent 0473339ac4
commit 567def2e9b
1 changed files with 10 additions and 0 deletions
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src/include/units/derived_dimension.h
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@@ -63,6 +63,16 @@ using make_dimension = to_derived_dimension_base<typename dim_consolidate<type_l
* The implementation is responsible for unpacking all of the dimensions into a list containing only base dimensions * The implementation is responsible for unpacking all of the dimensions into a list containing only base dimensions
* and their factors and putting them to derived_dimension_base class template. * and their factors and putting them to derived_dimension_base class template.
* *
* Sometimes units of equivalent quantities in different systems of units do not share the same reference so they
* cannot be easily converted to each other. An example can be a pressure for which a coherent unit in SI is pascal
* and in CGS barye. Those two units are not directly related with each other with some ratio. As they both are
* coherent units of their dimensions, the ratio between them is directly determined by the ratios of base units
* defined in base dimensions end their exponents in the derived dimension recipe. To provide interoperability of
* such quantities of different systems base_units_ratio is being used. The result of the division of two
* base_units_ratio of two quantities of equivalent dimensions in two different systems gives a ratio between their
* coherent units. Alternatively, the user would always have to directly define a barye in terms of pascal or vice
* versa.
*
* @tparam Child inherited class type used by the downcasting facility (CRTP Idiom) * @tparam Child inherited class type used by the downcasting facility (CRTP Idiom)
* @tparam U a coherent unit of a derived dimension * @tparam U a coherent unit of a derived dimension
* @tparam E the list of exponents of ingredient dimensions * @tparam E the list of exponents of ingredient dimensions