From cd2a80be8f2b3c41fd66149dfdef32560a104ef2 Mon Sep 17 00:00:00 2001
From: Philippe-Cholet <44676486+Philippe-Cholet@users.noreply.github.com>
Date: Fri, 26 Apr 2024 10:19:25 +0200
Subject: [PATCH] New private method `Powerset::increment_k`

---
 src/powerset.rs | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/powerset.rs b/src/powerset.rs
index 1b2b38540..019e2711f 100644
--- a/src/powerset.rs
+++ b/src/powerset.rs
@@ -42,6 +42,18 @@ where
     }
 }
 
+impl<I: Iterator> Powerset<I> {
+    /// Returns true if `k` has been incremented, false otherwise.
+    fn increment_k(&mut self) -> bool {
+        if self.combs.k() < self.combs.n() || self.combs.k() == 0 {
+            self.combs.reset(self.combs.k() + 1);
+            true
+        } else {
+            false
+        }
+    }
+}
+
 impl<I> Iterator for Powerset<I>
 where
     I: Iterator,
@@ -52,8 +64,7 @@ where
     fn next(&mut self) -> Option<Self::Item> {
         if let Some(elt) = self.combs.next() {
             Some(elt)
-        } else if self.combs.k() < self.combs.n() || self.combs.k() == 0 {
-            self.combs.reset(self.combs.k() + 1);
+        } else if self.increment_k() {
             self.combs.next()
         } else {
             None