From 17b8ee5eb30a5df8d844dd8b2d96042afb725b47 Mon Sep 17 00:00:00 2001
From: Bruno BELANYI <bruno@belanyi.fr>
Date: Sun, 17 Jul 2022 21:30:23 +0200
Subject: [PATCH] Add 'Square::index'

---
 src/board/square.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/board/square.rs b/src/board/square.rs
index 1b8e932..7f1c822 100644
--- a/src/board/square.rs
+++ b/src/board/square.rs
@@ -60,6 +60,12 @@ impl Square {
         std::mem::transmute(index as u8)
     }
 
+    /// Return the index of a given [Square].
+    #[inline(always)]
+    pub fn index(self) -> usize {
+        self as usize
+    }
+
     /// Return the index of the rank of this square (0 -> rank 1, ..., 7 -> rank 8).
     #[inline(always)]
     pub fn rank_index(self) -> usize {
@@ -188,6 +194,14 @@ mod test {
         assert_eq!(Square::new(File::H, Rank::Eighth), Square::H8);
     }
 
+    #[test]
+    fn index() {
+        assert_eq!(Square::A1.index(), 0);
+        assert_eq!(Square::A2.index(), 1);
+        assert_eq!(Square::B1.index(), 8);
+        assert_eq!(Square::H8.index(), 63);
+    }
+
     #[test]
     fn file() {
         assert_eq!(Square::A1.file(), File::A);