From 5fab56829b6337e930b1c1a18c8b54c4ceeb01ca Mon Sep 17 00:00:00 2001
From: Pavel Grigorenko <grigorenkopv@ya.ru>
Date: Sun, 28 May 2023 02:10:34 +0300
Subject: [PATCH] Flip

---
 src/btree.rs | 24 ++++++++++++++++++++++++
 src/hash.rs  | 24 ++++++++++++++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/src/btree.rs b/src/btree.rs
index 2267f2f..f6fd157 100644
--- a/src/btree.rs
+++ b/src/btree.rs
@@ -567,6 +567,30 @@ where
             inner: self.right2left.range::<Wrapper<_>, _>((start, end)),
         }
     }
+
+    /// Swaps the left side and the right side of the bimap.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::iter::FromIterator;
+    /// use bimap::BiBTreeMap;
+    ///
+    /// let int_char = BiBTreeMap::from_iter([(0, '0'), (1, '1')]);
+    /// let char_int = BiBTreeMap::from_iter([('0', 0), ('1', 1)]);
+    /// assert_eq!(int_char.clone().flip(), char_int);
+    /// assert_eq!(int_char, char_int.flip());
+    /// ```
+    pub fn flip(self) -> BiBTreeMap<R, L> {
+        let BiBTreeMap {
+            left2right,
+            right2left,
+        } = self;
+        BiBTreeMap {
+            left2right: right2left,
+            right2left: left2right,
+        }
+    }
 }
 
 impl<L, R> Clone for BiBTreeMap<L, R>
diff --git a/src/hash.rs b/src/hash.rs
index c56f84c..eaf9d3c 100644
--- a/src/hash.rs
+++ b/src/hash.rs
@@ -211,6 +211,30 @@ where
             inner: self.right2left.iter(),
         }
     }
+
+    /// Swaps the left side and the right side of the bimap.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::iter::FromIterator;
+    /// use bimap::BiHashMap;
+    ///
+    /// let int_char = BiHashMap::<_, _>::from_iter([(0, '0'), (1, '1')]);
+    /// let char_int = BiHashMap::<_, _>::from_iter([('0', 0), ('1', 1)]);
+    /// assert_eq!(int_char.clone().flip(), char_int);
+    /// assert_eq!(int_char, char_int.flip());
+    /// ```
+    pub fn flip(self) -> BiHashMap<R, L, RS, LS> {
+        let BiHashMap {
+            left2right,
+            right2left,
+        } = self;
+        BiHashMap {
+            left2right: right2left,
+            right2left: left2right,
+        }
+    }
 }
 
 impl<L, R, LS, RS> BiHashMap<L, R, LS, RS>