Fix: Unit types divided by the same unit type should yield Dimensionless

alexdewar · alexdewar · commit 86791a4321a1 · 2025-06-23T17:19:22.000+01:00
diff --git a/src/units.rs b/src/units.rs
@@ -27,9 +27,9 @@ macro_rules! base_unit_struct {
             }
         }
         impl std::ops::Div<$name> for $name {
-            type Output = $name;
-            fn div(self, rhs: $name) -> $name {
-                $name(self.0 / rhs.0)
+            type Output = Dimensionless;
+            fn div(self, rhs: $name) -> Dimensionless {
+                Dimensionless(self.0 / rhs.0)
             }
         }
         impl std::iter::Sum for $name {

Original file line number	Diff line number	Diff line change
`@@ -27,9 +27,9 @@ macro_rules! base_unit_struct {`
`27`	`27`	`}`
`28`	`28`	`}`
`29`	`29`	`impl std::ops::Div<$name> for $name {`
`30`		`- type Output = $name;`
`31`		`- fn div(self, rhs: $name) -> $name {`
`32`		`- $name(self.0 / rhs.0)`
	`30`	`+ type Output = Dimensionless;`
	`31`	`+ fn div(self, rhs: $name) -> Dimensionless {`
	`32`	`+ Dimensionless(self.0 / rhs.0)`
`33`	`33`	`}`
`34`	`34`	`}`
`35`	`35`	`impl std::iter::Sum for $name {`