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r24755:9b2ef076754d 2.2 KiB text/x-c Show Annotation Show as Raw Download as Raw

Michael Lutz

Codechange: Don't use cpp_offsetof in the save/load code.

Many of the member variables that are used in save/load are inside types
that are not standard layout types. Using pointer arithmetics to determine
addresses of members inside types that are not standard layout is generally
undefined behaviour. If we'd use C++17, it is conditionally supported, which means
each compiler may or may not support it. And even then using it for individual
array elements is syntactically not supported the the standard offsetof function.

Unfortunately, the trickery employed for saving linkgraph settings causes quite some
clutter in the settings ini files.

/*
 * 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 waypoint_base.h Base of waypoints. */

#ifndef WAYPOINT_BASE_H
#define WAYPOINT_BASE_H

#include "base_station_base.h"

/** Representation of a waypoint. */
struct Waypoint FINAL : SpecializedStation<Waypoint, true> {
	uint16 town_cn;    ///< The N-1th waypoint for this town (consecutive number)

	/**
	 * Create a waypoint at the given tile.
	 * @param tile The location of the waypoint.
	 */
	Waypoint(TileIndex tile = INVALID_TILE) : SpecializedStation<Waypoint, true>(tile) { }
	~Waypoint();

	void UpdateVirtCoord() override;

	void MoveSign(TileIndex new_xy) override;

	inline bool TileBelongsToRailStation(TileIndex tile) const override
	{
		return IsRailWaypointTile(tile) && GetStationIndex(tile) == this->index;
	}

	uint32 GetNewGRFVariable(const struct ResolverObject &object, byte variable, byte parameter, bool *available) const override;

	void GetTileArea(TileArea *ta, StationType type) const override;

	uint GetPlatformLength(TileIndex tile, DiagDirection dir) const override
	{
		return 1;
	}

	uint GetPlatformLength(TileIndex tile) const override
	{
		return 1;
	}

	/**
	 * Is this a single tile waypoint?
	 * @return true if it is.
	 */
	inline bool IsSingleTile() const
	{
		return (this->facilities & FACIL_TRAIN) != 0 && this->train_station.w == 1 && this->train_station.h == 1;
	}

	/**
	 * Is the "type" of waypoint the same as the given waypoint,
	 * i.e. are both a rail waypoint or are both a buoy?
	 * @param wp The waypoint to compare to.
	 * @return true iff their types are equal.
	 */
	inline bool IsOfType(const Waypoint *wp) const
	{
		return this->string_id == wp->string_id;
	}
};

#endif /* WAYPOINT_BASE_H */