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derived_unit removed

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Mateusz Pusz
2019-11-05 20:34:58 +00:00
parent b5b2c54fe8
commit 3e131a82d4
2 changed files with 5 additions and 15 deletions
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15
doc/DESIGN.md
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@@ -283,11 +283,6 @@ template<typename Child, basic_fixed_string Symbol, Dimension D, Ratio R>
struct named_derived_unit : downcast_child<Child, unit<D, R>> {
static constexpr auto symbol = Symbol;
};
template<typename Child, Dimension D, Ratio R>
struct derived_unit : downcast_child<Child, unit<D, R>> {
static constexpr auto symbol = /* ... */;
};
```
User has to provide a symbol name (in case of a named unit), dimension, and a ratio relative
@@ -463,8 +458,8 @@ template<Scalar ToRep, typename U, typename Rep>
The library tries its best to print a correct unit of the quantity. This is why it performs a series
of checks:
1. If the user predefined a unit with a `coherent_derived_unit` or `derived_unit` class templates,
the symbol provided by the user will be used (i.e. `60 W`).
1. If the user predefined a unit with a `named_XXX_derived_unit` class templates, the symbol provided
by the user will be used (i.e. `60 W`).
2. If a quantity has an unknown unit for a dimension predefined by the user with `derived_dimension`,
the symbol of a coherent unit of this dimension will be used. Additionally:
- if `Prefix` template parameter of a `coherent_derived_unit` is different than `no_prefix` then
@@ -645,7 +640,7 @@ facility is to publicly derive from one of those CRTP types and provide its new
the first template parameter of the CRTP type.
```cpp
struct metre : derived_unit<metre, "m", length> {};
struct metre : named_derived_unit<metre, "m", length> {};
```
Above types are used to define base and target of a downcasting operation. To perform the actual
@@ -736,10 +731,10 @@ In order to extend the library with custom dimensions the user has to:
5. Define units and register them to a downcasting facility:
```cpp
struct bit : units::coherent_derived_unit<bit, "b", digital_information, data_prefix> {};
struct bit : units::named_coherent_derived_unit<bit, "b", digital_information, data_prefix> {};
struct kilobit : units::prefixed_derived_unit<kilobit, kibi, bit> {};
struct byte : units::derived_unit<byte, "B", digital_information, units::ratio<8>> {};
struct byte : units::named_derived_unit<byte, "B", digital_information, units::ratio<8>> {};
struct kilobyte : units::prefixed_derived_unit<kilobyte, kibi, byte> {};
```

5
src/include/units/unit.h
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@@ -290,11 +290,6 @@ namespace units {
static constexpr auto symbol = Symbol;
};
template<typename Child, Dimension D, Ratio R>
struct derived_unit : downcast_child<Child, unit<D, R>> {
static constexpr auto symbol = basic_fixed_string("aaa");
};
template<typename Child, Prefix P, Unit U>
requires requires { U::symbol; }
struct prefixed_derived_unit : downcast_child<Child, unit<typename U::dimension, ratio_multiply<typename P::ratio, typename U::ratio>>> {