From efb80c3b40da06bc605b906ec0032614498d29a9 Mon Sep 17 00:00:00 2001
From: Kieran Kihn <114803508+kierankihn@users.noreply.github.com>
Date: Sun, 16 Nov 2025 13:23:41 +0800
Subject: [PATCH] feat(game): add operator< for `Card`

---
 src/game/Card.cpp | 7 +++++++
 src/game/Card.h   | 5 +++++
 2 files changed, 12 insertions(+)

diff --git a/src/game/Card.cpp b/src/game/Card.cpp
index 3fc2864..9abf7a7 100644
--- a/src/game/Card.cpp
+++ b/src/game/Card.cpp
@@ -68,4 +68,11 @@ namespace UNO::GAME {
         }
         return std::format("{} {}", this->colorToString(), this->typeToString());
     }
+
+    bool Card::operator<(const Card &other) const {
+        if (this->color_ != other.color_) {
+            return this->color_ < other.color_;
+        }
+        return this->type_ < other.type_;
+    }
 }
diff --git a/src/game/Card.h b/src/game/Card.h
index 9a3f28a..3082265 100644
--- a/src/game/Card.h
+++ b/src/game/Card.h
@@ -81,6 +81,11 @@ namespace UNO::GAME {
          * @return 卡牌对应的显示字符串
          */
         [[nodiscard]] std::string toString() const;
+
+        /**
+         * 比较运算符，用于排序
+         */
+        bool operator<(const Card &other) const;
     };
 }   // namespace UNO::GAME