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Design documentation updated with unit prefixes

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Mateusz Pusz
2019-04-11 18:56:09 +01:00
parent f995f5ce60
commit 2af2a28699
1 changed files with 16 additions and 3 deletions
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19
doc/DESIGN.md
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@@ -404,12 +404,25 @@ template<typename T>
concept Velocity = Quantity<T> && std::Same<typename T::dimension, dimension_velocity>;
```
4. Define the base and secondary units and provide upcasting traits for them:
4. Define units and provide upcasting traits for them:
- base unit
```cpp
struct meter_per_second : derived_unit<dimension_velocity, meter, second> {};
template<> struct upcasting_traits<upcast_from<meter_per_second>> : upcast_to<meter_per_second> {};
struct meter : unit<dimension_length, std::ratio<1>> {};
template<> struct upcasting_traits<upcast_from<meter>> : upcast_to<meter> {};
```
- units with prefixes
```cpp
struct kilometer : kilo<meter> {};
template<> struct upcasting_traits<upcast_from<kilometer>> : upcast_to<kilometer> {};
```
- derived units
```cpp
struct kilometer_per_hour : derived_unit<dimension_velocity, kilometer, hour> {};
template<> struct upcasting_traits<upcast_from<kilometer_per_hour>> : upcast_to<kilometer_per_hour> {};
```