Added Ratable implementation for &'a T and &'a mut T.

src/gaussian.rs

@@ -41,7 +41,7 @@ impl Gaussian {
 
     pub fn mu(&self) -> f64 {
         if self.pi == 0.0 {
-            return 0.0;
+            0.0
         } else {
             self.tau / self.pi
         }

src/lib.rs

@@ -45,6 +45,36 @@ pub trait Rateable {
     }
 }
 
+impl<'a, T> Rateable for &'a T
+where
+    T: Rateable,
+{
+    #[inline]
+    fn mu(&self) -> f64 {
+        T::mu(self)
+    }
+
+    #[inline]
+    fn sigma(&self) -> f64 {
+        T::sigma(self)
+    }
+}
+
+impl<'a, T> Rateable for &'a mut T
+where
+    T: Rateable,
+{
+    #[inline]
+    fn mu(&self) -> f64 {
+        T::mu(self)
+    }
+
+    #[inline]
+    fn sigma(&self) -> f64 {
+        T::sigma(self)
+    }
+}
+
 pub trait RateableMut {
     fn mu_mut(&mut self) -> &mut f64;
     fn sigma_mut(&mut self) -> &mut f64;