From 5250dbb44b2e2c5db6b28970c6debb20159fc0fe Mon Sep 17 00:00:00 2001
From: Steve Wooster <s.f.m.wooster+securedna@gmail.com>
Date: Wed, 30 Nov 2022 22:37:27 -0800
Subject: [PATCH] Add explicit len implementations

Also removed unecessary type bound on Iterator implementation
of ForwardOrRcCodons.
---
 src/iter.rs | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/src/iter.rs b/src/iter.rs
index b1f42b7..0d9c7c5 100644
--- a/src/iter.rs
+++ b/src/iter.rs
@@ -332,6 +332,9 @@ where
     Self: Iterator,
     I: ExactSizeIterator,
 {
+    fn len(&self) -> usize {
+        self.0.len()
+    }
 }
 
 /// Adapter yielding complementary nucleotide of the contained iterator.
@@ -374,6 +377,9 @@ where
     Self: Iterator,
     I: ExactSizeIterator,
 {
+    fn len(&self) -> usize {
+        self.0.len()
+    }
 }
 
 /// Adapter capable of holding either forward codon iterators or reverse complement codon iterators.
@@ -389,7 +395,7 @@ pub enum ForwardOrRcCodons<I> {
 impl<N, I> Iterator for ForwardOrRcCodons<I>
 where
     N: ToNucleotideLike,
-    I: DoubleEndedIterator<Item = N> + ExactSizeIterator,
+    I: DoubleEndedIterator<Item = N>,
 {
     type Item = <N::NucleotideType as NucleotideLike>::Codon;
 
@@ -421,11 +427,18 @@ where
     }
 }
 
-impl<I> ExactSizeIterator for ForwardOrRcCodons<I>
+impl<N, I> ExactSizeIterator for ForwardOrRcCodons<I>
 where
     Self: Iterator,
-    I: ExactSizeIterator,
+    N: ToNucleotideLike,
+    I: DoubleEndedIterator<Item = N> + ExactSizeIterator,
 {
+    fn len(&self) -> usize {
+        match self {
+            Self::Forward(iter) => iter.len(),
+            Self::Rc(iter) => iter.len(),
+        }
+    }
 }
 
 #[cfg(test)]