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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/custom_unit_test.cpp
+3 -3
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@@ -33,14 +33,14 @@ using namespace units::physical::si;
// power spectral density
struct sq_volt_per_hertz : unit<sq_volt_per_hertz> {};
struct dim_power_spectral_density : derived_dimension<dim_power_spectral_density, sq_volt_per_hertz, units::exp<dim_voltage, 2>, units::exp<dim_frequency, -1>> {};
struct dim_power_spectral_density : derived_dimension<dim_power_spectral_density, sq_volt_per_hertz, units::exponent<dim_voltage, 2>, units::exponent<dim_frequency, -1>> {};
template<Unit U, Scalar Rep = double>
using power_spectral_density = quantity<dim_power_spectral_density, U, Rep>;
// amplitude spectral density
struct volt_per_sqrt_hertz : unit<volt_per_sqrt_hertz> {};
struct dim_amplitude_spectral_density : derived_dimension<dim_amplitude_spectral_density, volt_per_sqrt_hertz, units::exp<dim_voltage, 1>, units::exp<dim_frequency, -1, 2>> {};
struct dim_amplitude_spectral_density : derived_dimension<dim_amplitude_spectral_density, volt_per_sqrt_hertz, units::exponent<dim_voltage, 1>, units::exponent<dim_frequency, -1, 2>> {};
template<Unit U, Scalar Rep = double>
using amplitude_spectral_density = quantity<dim_amplitude_spectral_density, U, Rep>;
@@ -60,7 +60,7 @@ static_assert(is_same_v<decltype(sqrt(power_spectral_density<sq_volt_per_hertz>(
namespace {
struct kilogram_per_second : unit<kilogram_per_second> {};
struct dim_mass_rate : derived_dimension<dim_mass_rate, kilogram_per_second, units::exp<dim_mass, 1>, units::exp<dim_time, -1>> {};
struct dim_mass_rate : derived_dimension<dim_mass_rate, kilogram_per_second, units::exponent<dim_mass, 1>, units::exponent<dim_time, -1>> {};
struct kilogram_per_hour : deduced_unit<kilogram_per_hour, dim_mass_rate, kilogram, hour> {};
constexpr auto a = 1q_kg / 1q_h;
static_assert(is_same_v<decltype(a)::unit, kilogram_per_hour>);