wip: partial cmp

deferred_division/src/wide.rs

@@ -1,7 +1,19 @@
 use std::ops::{Add,Mul};
+use std::cmp::Ordering;
 use crate::ratio::Ratio;
 use fixed_wide_traits::wide::{WideMul,WideDiv};
 
+impl<Num,Den,T> PartialOrd<T> for Ratio<Num,Den>
+{
+	fn partial_cmp(&self,other:&T)->Option<Ordering>{
+		//a < c*b
+		match self.den.cmp(0){
+			Ordering::Less=>Some(self.num.partial_cmp(self.den.mul(other))),
+			Ordering::Equal=>None,//divide by zero
+			Ordering::Greater=>Some(self.num.partial_cmp(self.den.mul(other)).reverse()),
+		}
+	}
+}
 impl<Num,Den:Copy> Ratio<Num,Den>
 {
 	pub fn rational_add<T>(self,rhs:T)->Ratio<<Num as Add<<Den as Mul<T>>::Output>>::Output,Den>