From 703dcef59f18a8cf7b8c696b7738c416a06c0cc4 Mon Sep 17 00:00:00 2001
From: Karma Riuk <riukkarma@gmail.com>
Date: Sun, 2 Feb 2025 20:24:42 +0100
Subject: [PATCH] implemented knight legal moves

---
 cpp/src/pieces/knight.cpp | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 cpp/src/pieces/knight.cpp

diff --git a/cpp/src/pieces/knight.cpp b/cpp/src/pieces/knight.cpp
new file mode 100644
index 0000000..e38c0c5
--- /dev/null
+++ b/cpp/src/pieces/knight.cpp
@@ -0,0 +1,28 @@
+#include "../board.hpp"
+#include "../coords.hpp"
+#include "../move.hpp"
+#include "piece.hpp"
+
+#include <vector>
+
+std::vector<Move> knight_moves(const Board& b, const Coords xy) {
+    std::vector<Move> ret;
+    std::vector<std::pair<int, int>> moves = {
+        {+2, +1},
+        {+1, +2}, // north east
+        {+2, -1},
+        {+1, -2}, // south east
+        {-2, -1},
+        {-1, -2}, // south west
+        {-2, +1},
+        {-1, +2} // north west
+    };
+
+    for (const auto& [dx, dy] : moves) {
+        std::optional<Move> move =
+            move_for_position(b, xy, Coords{xy.x + dx, xy.y + dy});
+        if (move.has_value())
+            ret.push_back(move.value());
+    }
+    return ret;
+}