1 files changed, 89 insertions, 0 deletions
diff --git a/src/metric/temperature.rs b/src/metric/temperature.rs
new file mode 100644
index 0000000..06c1489
--- /dev/null
+++ b/src/metric/temperature.rs
@@ -0,0 +1,89 @@
+use std::fmt::{Display, Formatter, Result};
+use std::ops::{Add, Sub, AddAssign, SubAssign, Div, Mul, DivAssign, MulAssign};
+
+use crate::metric::Unit;
+use crate::metric::Primitive;
+
+use crate::declare_unit_basics;
+
+#[derive(Copy, Clone, Debug, PartialOrd, PartialEq)]
+pub enum ThermodynamicTemperature {
+    Base(f64, fn(f64) -> f64, &'static str),
+    Canonical(f64),
+    Kelvin(f64),
+}
+
+impl Unit<ThermodynamicTemperature> for ThermodynamicTemperature {
+    fn to_si_unit(&self) -> ThermodynamicTemperature {
+        match self {
+            ThermodynamicTemperature::Base(_, _, _) => self.clone(),
+            ThermodynamicTemperature::Canonical(value) => ThermodynamicTemperature::Base(value.clone(), |x| x, "K"),
+            ThermodynamicTemperature::Kelvin(value) => ThermodynamicTemperature::Base(value.clone(), |x| x, "K"),
+        }
+    }
+}
+
+declare_unit_basics!(ThermodynamicTemperature);
+
+#[derive(Copy, Clone, Debug, PartialOrd, PartialEq)]
+pub enum CelsiusTemperature {
+    Base(f64, fn(f64) -> f64, &'static str),
+    Canonical(f64),
+    Celsius(f64),
+    Fahrenheit(f64),
+}
+
+impl Unit<CelsiusTemperature> for CelsiusTemperature {
+    fn to_si_unit(&self) -> CelsiusTemperature {
+        match self {
+            CelsiusTemperature::Base(_, _, _) => self.clone(),
+            CelsiusTemperature::Canonical(value) => CelsiusTemperature::Base(value.clone(), |x| x, "K"),
+            CelsiusTemperature::Celsius(value) => CelsiusTemperature::Base(value.clone(), |x| x, "°C"),
+            CelsiusTemperature::Fahrenheit(value) => CelsiusTemperature::Base((value - 32.0) / 1.8 , |x| x * 1.8 + 32.0, "°F"),
+        }
+    }
+}
+
+declare_unit_basics!(CelsiusTemperature);
+
+/* --- temperature interoperability: C +/- K --- */
+
+impl Add<ThermodynamicTemperature> for CelsiusTemperature {
+    type Output = CelsiusTemperature;
+
+    fn add(self, rhs: ThermodynamicTemperature) -> Self::Output {
+        match self.to_si_unit() {
+            CelsiusTemperature::Base(value, from_si, symbol) => CelsiusTemperature::Base(value + rhs.to_si_primitive(), from_si, symbol),
+            _ => panic!("non si unit post to_si_unit() call")
+        }
+    }
+}
+
+impl AddAssign<ThermodynamicTemperature> for CelsiusTemperature {
+    fn add_assign(&mut self, rhs: ThermodynamicTemperature) {
+        match self.to_si_unit() {
+            CelsiusTemperature::Base(value, from_si, symbol) => *self = CelsiusTemperature::Base(value + rhs.to_si_primitive(), from_si, symbol),
+            _ => panic!("non si unit post to_si_unit() call")
+        }
+    }
+}
+
+impl Sub<ThermodynamicTemperature> for CelsiusTemperature {
+    type Output = CelsiusTemperature;
+
+    fn sub(self, rhs: ThermodynamicTemperature) -> Self::Output {
+        match self.to_si_unit() {
+            CelsiusTemperature::Base(value, from_si, symbol) => CelsiusTemperature::Base(value + rhs.to_si_primitive(), from_si, symbol),
+            _ => panic!("non si unit post to_si_unit() call")
+        }
+    }
+}
+
+impl SubAssign<ThermodynamicTemperature> for CelsiusTemperature {
+    fn sub_assign(&mut self, rhs: ThermodynamicTemperature) {
+        match self.to_si_unit() {
+            CelsiusTemperature::Base(value, from_si, symbol) => *self = CelsiusTemperature::Base(value - rhs.to_si_primitive(), from_si, symbol),
+            _ => panic!("non si unit post to_si_unit() call")
+        }
+    }
+}
+\ No newline at end of file