Move zip implementation from poly to poly/iter

Zip seems more appropriate on an iterator.

1 files changed, 13 insertions, 3 deletions

diff --git a/src/poly/iter.rs b/src/poly/iter.rs
index 26c5989..abc7462 100644
--- a/src/poly/iter.rs
+++ b/src/poly/iter.rs
@@ -1,13 +1,23 @@
 use crate::number::Number;
+use std::cmp;
+use std::iter::{Zip, Take};
 
 pub struct Iter {
     index: usize,
-    data: Vec<Number>
+    data: Vec<Number>,
+    degree: usize
 }
 
 impl Iter {
-    pub fn new(data: Vec<Number>) -> Iter {
-        Iter { index: 0, data }
+    pub fn new(data: Vec<Number>, degree: usize) -> Iter {
+        Iter { index: 0, data, degree }
+    }
+
+    pub fn zip(self, other: Self) -> Zip<Take<Iter>, Take<Iter>> {
+        let deg = cmp::max(self.degree, other.degree) + 1;
+        let a = self.take(deg);
+        let b = other.take(deg);
+        a.zip(b)
     }
 }