Add clamp function

src/lib.rs

@@ -109,3 +109,10 @@ pub mod traits {
 pub mod rational {
     pub use num_rational::*;
 }
+
+pub fn clamp<T: PartialOrd + Copy>(input: T, min: T, max: T) -> T {
+    debug_assert!(min < max, "min must be less than max");
+    if input < min {min}
+    else if input > max {max}
+    else {input}
+}