From 3e4fb93a594f11a80904653396698d6c70e07cb0 Mon Sep 17 00:00:00 2001
From: Niklas Halle <niklas@niklashalle.net>
Date: Sat, 31 Oct 2020 20:44:44 +0100
Subject: Initial public release

---
 src/metric/mass.rs | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 src/metric/mass.rs

(limited to 'src/metric/mass.rs')

diff --git a/src/metric/mass.rs b/src/metric/mass.rs
new file mode 100644
index 0000000..462d840
--- /dev/null
+++ b/src/metric/mass.rs
@@ -0,0 +1,36 @@
+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 Mass {
+    Base(f64, fn(f64) -> f64, &'static str),
+    Canonical(f64),
+    Kilogram(f64),
+    Milligram(f64),
+    Gram(f64),
+    Tonne(f64),
+    Ounce(f64), // international avoirdupois ounce
+    Pound(f64), // International avoirdupois pound
+}
+
+impl Unit<Mass> for Mass {
+    fn to_si_unit(&self) -> Mass {
+        match self {
+            Mass::Base(_, _, _) => self.clone(),
+            Mass::Canonical(value) => Mass::Base(value.clone(), |x| x, "kg"),
+            Mass::Kilogram(value) => Mass::Base(value.clone(), |x| x, "kg"),
+            Mass::Gram(value) => Mass::Base(value / 1000.0, |x| x * 1000.0, "g"),
+            Mass::Milligram(value) => Mass::Base(value / 1_000_000.0, |x| x * 1_000_000.0, "mg"),
+            Mass::Tonne(value) => Mass::Base(value * 1000.0, |x| x / 1000.0, "t"),
+            Mass::Ounce(value) => Mass::Base(value * 28.349523125 / 1000.0, |x| x / 28.349523125 * 1000.0, "℥"),
+            Mass::Pound(value) => Mass::Base(value * 0.45359237, |x| x / 0.45359237, "lb"),
+        }
+    }
+}
+
+declare_unit_basics!(Mass);
\ No newline at end of file
-- 
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