units of measurement

1 files changed, 31 insertions, 0 deletions

diff --git a/src/mass.rs b/src/mass.rs
new file mode 100644
index 0000000..9c57f16
--- /dev/null
+++ b/src/mass.rs
@@ -0,0 +1,31 @@
+pub struct Mass(f64); // Base unit is grams
+
+impl Mass {
+    /* constructors */
+    pub fn from_grams(grams: f64) -> Mass {
+        Mass(grams)
+    }
+
+    pub fn from_kilograms(kilos: f64) -> Mass {
+        Mass(kilos / 1000.)
+    }
+
+    pub fn from_moles(moles: f64, molar_mass: f64) -> Mass {
+        let kilos = moles * molar_mass;
+        Mass::from_kilograms(kilos)
+    }
+
+    /* metric */
+    pub fn as_grams(&self) -> f64 {
+        self.0
+    }
+
+    pub fn as_kilograms(&self) -> f64 {
+        self.0 / 1000.
+    }
+
+    /* imperial */
+    pub fn as_pounds(&self) -> f64 {
+        self.0 * 0.002204623
+    }
+}