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feat!: 💥 dimensionless quantities refactored

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Dimensionless quantities are now represented by quantity types rather
than by plain representation types. Only dimensionless quantities with
`unitless` unit are implicitly convertible from representation types.

`units::exp()` now is a function doing std::exp() on a representation
type (previous `units::exp` class template was renamed to
`units::exponent`).

BREAKING_CHANGE: gcc-9.3 support removed
BREAKING_CHANGE: `exp` and `Exp` renamed to `exponent` and `Exponent`
Resolves #27
Resolves #42
This commit is contained in:
Mateusz Pusz
2020-09-08 11:02:16 +02:00
parent c8b60b80c1
commit 563b358d5e
47 changed files with 599 additions and 422 deletions
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test/unit_test/static/unit_test.cpp
+1 -1
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@@ -46,7 +46,7 @@ static_assert([]<Prefix P>(P) { return !requires { typename prefixed_unit<struct
#endif
struct metre_per_second : unit<metre_per_second> {};
struct dim_speed : derived_dimension<dim_speed, metre_per_second, units::exp<dim_length, 1>, units::exp<dim_time, -1>> {};
struct dim_speed : derived_dimension<dim_speed, metre_per_second, units::exponent<dim_length, 1>, units::exponent<dim_time, -1>> {};
struct kilometre_per_hour : deduced_unit<kilometre_per_hour, dim_speed, kilometre, hour> {};
static_assert(is_same_v<downcast<scaled_unit<ratio(1), metre>>, metre>);