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use super::*;
use std::fmt;
pub trait Converter<T> {
fn to_standard(&self, value: T) -> T;
fn from_standard(&self, value: T) -> T;
}
impl<T> fmt::Debug for Box<dyn Converter<T>> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "[converter]")
}
}
#[derive(Clone, Debug)]
pub struct Celsius<T> {
delta: T,
}
impl<T> Celsius<T>
where
T: Add<T, Output = T> + Clone + FromStr + Sub<T, Output = T> + 'static,
<T as FromStr>::Err: fmt::Debug,
{
#[allow(clippy::new_ret_no_self)]
pub fn new() -> Box<dyn Converter<T>> {
Box::new(Celsius {
delta: "273.15".parse().unwrap(),
})
}
}
impl<T> Converter<T> for Celsius<T>
where
T: Add<T, Output = T> + Clone + Sub<T, Output = T>,
{
fn to_standard(&self, value: T) -> T {
value + self.delta.clone()
}
fn from_standard(&self, value: T) -> T {
value - self.delta.clone()
}
}