Feature: Create group of vehicles from manage vehicle list button. (#10890)

src/vehiclelist_cmd.h

@@ -0,0 +1,27 @@
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file vehiclelist_cmd.h Functions and type for serializing vehicle lists. */
+
+#ifndef VEHICLELIST_CMD_H
+#define VEHICLELIST_CMD_H
+
+#include "command_func.h"
+#include "vehiclelist.h"
+
+template <typename Tcont, typename Titer>
+inline EndianBufferWriter<Tcont, Titer> &operator <<(EndianBufferWriter<Tcont, Titer> &buffer, const VehicleListIdentifier &vli)
+{
+	return buffer << vli.type << vli.vtype << vli.company << vli.index;
+}
+
+inline EndianBufferReader &operator >>(EndianBufferReader &buffer, VehicleListIdentifier &vli)
+{
+	return buffer >> vli.type >> vli.vtype >> vli.company >> vli.index;
+}
+
+#endif /* VEHICLELIST_CMD_H */