In the beginning...

quantity/volume.odin

@@ -0,0 +1,59 @@
+package quantity
+
+import "base:intrinsics"
+
+//----- Liters ----------------------------------
+Liters :: struct($V: typeid) where intrinsics.type_is_numeric(V) {
+	v: V,
+}
+
+@(private = "file")
+liters_to_milli_liters :: #force_inline proc "contextless" (
+    liters: Liters($V),
+) -> Milli_Liters(V) where intrinsics.type_is_numeric(V) {
+    return Milli_Liters(V){liters.v * MILLI}
+}
+
+//----- Milliliters ----------------------------------
+Milli_Liters :: struct($V: typeid) where intrinsics.type_is_numeric(V) {
+	v: V,
+}
+
+@(private = "file")
+milli_liters_to_liters :: #force_inline proc "contextless" (
+	milli_liters: Milli_Liters($V),
+) -> Liters(V) where intrinsics.type_is_numeric(V) {
+	return Liters(V){milli_liters.v / MILLI}
+}
+
+// ---------------------------------------------------------------------------------------------------------------------
+// ----- Conversion Overloads ------------------------
+// ---------------------------------------------------------------------------------------------------------------------
+to_liters :: proc {
+    milli_liters_to_liters,
+}
+
+to_milli_liters :: proc {
+    liters_to_milli_liters,
+}
+
+// ---------------------------------------------------------------------------------------------------------------------
+// ----- Tests ------------------------
+// ---------------------------------------------------------------------------------------------------------------------
+import "core:testing"
+
+@(test)
+test_liters_to_milli_liters :: proc(t: ^testing.T) {
+    liters := Liters(int){12}
+    milli_liters := to_milli_liters(liters)
+
+    testing.expect_value(t, milli_liters, Milli_Liters(int){12_000})
+}
+
+@(test)
+test_milli_liters_to_liters :: proc(t: ^testing.T) {
+    milli_liters := Milli_Liters(int){12_000}
+    liters := to_liters(milli_liters)
+
+    testing.expect_value(t, liters, Liters(int){12})
+}