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use std::{
fmt::{self, Display, Formatter},
ops::Mul,
};
#[derive(Copy, Clone, Debug, Default, Eq, PartialEq)]
pub enum Unit {
#[default]
CubicMetre,
Litre,
}
impl Unit {
pub const ALL: [Self; 2] = [Self::CubicMetre, Self::Litre];
}
impl Display for Unit {
fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
write!(
f,
"{}",
match self {
Self::CubicMetre => "m³",
Self::Litre => "L",
}
)
}
}
#[derive(Debug, Default, PartialEq)]
pub struct CubicMetre(pub f64);
impl CubicMetre {
pub fn from_unit<F: Into<f64>>(unit: Unit, value: F) -> Self {
match unit {
Unit::CubicMetre => Self(value.into()),
Unit::Litre => Self::from(Litre(value.into())),
}
}
}
impl From<Litre> for CubicMetre {
fn from(value: Litre) -> Self {
Self(value.0 * 10_f64.powi(-3))
}
}
#[derive(Debug, PartialEq)]
struct Litre(f64);
impl<F: Into<f64>> From<F> for Litre {
fn from(value: F) -> Self {
Self(value.into())
}
}
impl From<CubicMetre> for Litre {
fn from(value: CubicMetre) -> Self {
Self(value.0 * 10_f64.powi(3))
}
}
impl<F: Into<f64>> Mul<F> for Litre {
type Output = Self;
fn mul(self, rhs: F) -> Self::Output {
Self(self.0 * rhs.into())
}
}
pub fn convert<F: Into<f64>>(val: F, from: Unit, to: Unit) -> f64 {
match from {
Unit::CubicMetre => match to {
Unit::CubicMetre => val.into(),
Unit::Litre => Litre::from(CubicMetre(val.into())).0,
},
Unit::Litre => match to {
Unit::Litre => val.into(),
Unit::CubicMetre => CubicMetre::from(Litre(val.into())).0,
},
}
}
#[cfg(test)]
mod tests {
use super::{CubicMetre, Litre};
#[test]
fn litre_to_cubic_metre() {
assert_eq!(CubicMetre::from(Litre(1000.)), CubicMetre(1.))
}
#[test]
fn cubic_metre_to_litre() {
assert_eq!(Litre::from(CubicMetre(1.)), Litre(1000.))
}
}
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