新增获取玩家数量接口

game/builtin/room.go

@@ -43,6 +43,10 @@ func (slf *Room[PlayerID, Player]) GetPlayers() synchronization.MapReadonly[Play
 	return slf.players
 }
 
+func (slf *Room[PlayerID, Player]) GetPlayerCount() int {
+	return slf.players.Size()
+}
+
 func (slf *Room[PlayerID, Player]) IsExistPlayer(id PlayerID) bool {
 	return slf.players.Exist(id)
 }

game/room.go

@@ -12,6 +12,8 @@ type Room[PlayerID comparable, P Player[PlayerID]] interface {
 	GetPlayer(id PlayerID) P
 	// GetPlayers 获取房间中的所有玩家
 	GetPlayers() synchronization.MapReadonly[PlayerID, P]
+	// GetPlayerCount 获取玩家数量
+	GetPlayerCount() int
 	// IsExistPlayer 检查房间中是否存在特定玩家
 	IsExistPlayer(id PlayerID) bool
 	// IsOwner 检查玩家是否是房主