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annotate src/base_station_base.h @ 13419:ddfb6a69b9c3 draft

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(svn r17928) -Codechange: ShowErrorMessage() now takes the summary string before the details string. Gentlemen, swap your string parameters.
author alberth <alberth@openttd.org>
date Sat, 31 Oct 2009 19:46:51 +0000
parents ecdff570eab8
children f6271037a1a0
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1 /* $Id$ */
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2
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3 /*
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4 * This file is part of OpenTTD.
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5 * 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.
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6 * 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.
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7 * 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/>.
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8 */
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9
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10 /** @file base_station_base.h Base classes/functions for base stations. */
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11
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12 #ifndef BASE_STATION_BASE_H
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13 #define BASE_STATION_BASE_H
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14
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15 #include "station_type.h"
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16 #include "core/pool_type.hpp"
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17 #include "town_type.h"
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18 #include "strings_type.h"
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19 #include "date_type.h"
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20 #include "company_type.h"
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21 #include "viewport_type.h"
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22 #include "station_map.h"
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23
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24 typedef Pool<BaseStation, StationID, 32, 64000> StationPool;
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25 extern StationPool _station_pool;
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26
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27 struct StationSpecList {
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28 const StationSpec *spec;
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29 uint32 grfid; ///< GRF ID of this custom station
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30 uint8 localidx; ///< Station ID within GRF of station
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31 };
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33
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34 /** StationRect - used to track station spread out rectangle - cheaper than scanning whole map */
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35 struct StationRect : public Rect {
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36 enum StationRectMode
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37 {
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38 ADD_TEST = 0,
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39 ADD_TRY,
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40 ADD_FORCE
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41 };
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42
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43 StationRect();
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44 void MakeEmpty();
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45 bool PtInExtendedRect(int x, int y, int distance = 0) const;
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46 bool IsEmpty() const;
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47 bool BeforeAddTile(TileIndex tile, StationRectMode mode);
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48 bool BeforeAddRect(TileIndex tile, int w, int h, StationRectMode mode);
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49 bool AfterRemoveTile(BaseStation *st, TileIndex tile);
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50 bool AfterRemoveRect(BaseStation *st, TileIndex tile, int w, int h);
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51
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52 static bool ScanForStationTiles(StationID st_id, int left_a, int top_a, int right_a, int bottom_a);
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53
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54 StationRect& operator = (Rect src);
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55 };
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56
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57 /** Base class for all station-ish types */
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58 struct BaseStation : StationPool::PoolItem<&_station_pool> {
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59 TileIndex xy; ///< Base tile of the station
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60 ViewportSign sign; ///< NOSAVE: Dimensions of sign
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61 byte delete_ctr; ///< Delete counter. If greater than 0 then it is decremented until it reaches 0; the waypoint is then is deleted.
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62
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63 char *name; ///< Custom name
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64 StringID string_id; ///< Default name (town area) of station
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65
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66 Town *town; ///< The town this station is associated with
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67 OwnerByte owner; ///< The owner of this station
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68 StationFacilityByte facilities; ///< The facilities that this station has
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69
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70 uint8 num_specs; ///< Number of specs in the speclist
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71 StationSpecList *speclist; ///< List of station specs of this station
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72
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73 Date build_date; ///< Date of construction
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74
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75 uint16 random_bits; ///< Random bits assigned to this station
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76 byte waiting_triggers; ///< Waiting triggers (NewGRF) for this station
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77 uint8 cached_anim_triggers; ///< NOSAVE: Combined animation trigger bitmask, used to determine if trigger processing should happen.
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78
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79 TileArea train_station; ///< Tile area the train 'station' part covers
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80 StationRect rect; ///< NOSAVE: Station spread out rectangle maintained by StationRect::xxx() functions
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81
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82 /**
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83 * Initialize the base station.
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84 * @param tile The location of the station sign
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85 */
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86 BaseStation(TileIndex tile) :
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87 xy(tile),
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88 train_station(INVALID_TILE, 0, 0)
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89 {
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90 }
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91
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92 virtual ~BaseStation();
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93
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94 /**
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95 * Check whether a specific tile belongs to this station.
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96 * @param tile the tile to check
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97 * @return true if the tile belongs to this station
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98 */
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99 virtual bool TileBelongsToRailStation(TileIndex tile) const = 0;
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100
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101 /**
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102 * Helper function to get a NewGRF variable that isn't implemented by the base class.
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103 * @param object the resolver object related to this query
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104 * @param variable that is queried
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105 * @param parameter parameter for that variable
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106 * @param available will return false if ever the variable asked for does not exist
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107 * @return the value stored in the corresponding variable
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108 */
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109 virtual uint32 GetNewGRFVariable(const struct ResolverObject *object, byte variable, byte parameter, bool *available) const = 0;
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110
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111 /**
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112 * Update the coordinated of the sign (as shown in the viewport).
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113 */
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114 virtual void UpdateVirtCoord() = 0;
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115
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116 /**
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117 * Get the tile area for a given station type.
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118 * @param ta tile area to fill.
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119 * @param type the type of the area
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120 */
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121 virtual void GetTileArea(TileArea *ta, StationType type) const = 0;
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122
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123
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124 /**
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125 * Obtain the length of a platform
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126 * @pre tile must be a rail station tile
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127 * @param tile A tile that contains the platform in question
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128 * @return The length of the platform
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129 */
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130 virtual uint GetPlatformLength(TileIndex tile) const = 0;
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131
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132 /**
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133 * Determines the REMAINING length of a platform, starting at (and including)
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134 * the given tile.
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135 * @param tile the tile from which to start searching. Must be a rail station tile
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136 * @param dir The direction in which to search.
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137 * @return The platform length
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138 */
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139 virtual uint GetPlatformLength(TileIndex tile, DiagDirection dir) const = 0;
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140
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141 /**
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142 * Get the base station belonging to a specific tile.
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143 * @param tile The tile to get the base station from.
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144 * @return the station associated with that tile.
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145 */
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146 static FORCEINLINE BaseStation *GetByTile(TileIndex tile)
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147 {
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148 return BaseStation::Get(GetStationIndex(tile));
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149 }
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150
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151 /**
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152 * Check whether the base station currently is in use; in use means
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153 * that it is not scheduled for deletion and that it still has some
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154 * facilities left.
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155 * @return true if still in use
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156 */
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157 FORCEINLINE bool IsInUse() const
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158 {
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159 return (this->facilities & ~FACIL_WAYPOINT) != 0;
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160 }
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161
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162 static void PostDestructor(size_t index);
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163 };
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164
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165 #define FOR_ALL_BASE_STATIONS(var) FOR_ALL_ITEMS_FROM(BaseStation, station_index, var, 0)
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166
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167 /**
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168 * Class defining several overloaded accessors so we don't
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169 * have to cast base stations that often
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170 */
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171 template <class T, bool Tis_waypoint>
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172 struct SpecializedStation : public BaseStation {
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173 static const StationFacility EXPECTED_FACIL = Tis_waypoint ? FACIL_WAYPOINT : FACIL_NONE; ///< Specialized type
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174
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175 /**
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176 * Set station type correctly
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177 * @param tile The base tile of the station.
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178 */
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179 FORCEINLINE SpecializedStation<T, Tis_waypoint>(TileIndex tile) :
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180 BaseStation(tile)
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181 {
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182 this->facilities = EXPECTED_FACIL;
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183 }
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184
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185 /**
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186 * Helper for checking whether the given station is of this type.
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187 * @param st the station to check.
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188 * @return true if the station is the type we expect it to be.
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189 */
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190 static FORCEINLINE bool IsExpected(const BaseStation *st)
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191 {
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192 return (st->facilities & FACIL_WAYPOINT) == EXPECTED_FACIL;
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193 }
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194
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195 /**
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196 * Tests whether given index is a valid index for station of this type
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197 * @param index tested index
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198 * @return is this index valid index of T?
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199 */
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200 static FORCEINLINE bool IsValidID(size_t index)
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201 {
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202 return BaseStation::IsValidID(index) && IsExpected(BaseStation::Get(index));
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203 }
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204
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205 /**
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206 * Gets station with given index
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207 * @return pointer to station with given index casted to T *
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208 */
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209 static FORCEINLINE T *Get(size_t index)
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210 {
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211 return (T *)BaseStation::Get(index);
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212 }
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213
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214 /**
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215 * Returns station if the index is a valid index for this station type
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216 * @return pointer to station with given index if it's a station of this type
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217 */
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218 static FORCEINLINE T *GetIfValid(size_t index)
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219 {
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220 return IsValidID(index) ? Get(index) : NULL ;
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221 }
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222
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223 /**
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224 * Get the station belonging to a specific tile.
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225 * @param tile The tile to get the station from.
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226 * @return the station associated with that tile.
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227 */
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228 static FORCEINLINE T *GetByTile(TileIndex tile)
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229 {
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230 return GetIfValid(GetStationIndex(tile));
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231 }
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232
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233 /**
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234 * Converts a BaseStation to SpecializedStation with type checking.
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235 * @param st BaseStation pointer
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236 * @return pointer to SpecializedStation
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237 */
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238 static FORCEINLINE T *From(BaseStation *st)
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239 {
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240 assert(IsExpected(st));
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241 return (T *)st;
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242 }
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243
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244 /**
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245 * Converts a const BaseStation to const SpecializedStation with type checking.
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246 * @param st BaseStation pointer
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247 * @return pointer to SpecializedStation
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248 */
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249 static FORCEINLINE const T *From(const BaseStation *st)
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250 {
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251 assert(IsExpected(st));
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252 return (const T *)st;
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253 }
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254 };
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255
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256 #define FOR_ALL_BASE_STATIONS_OF_TYPE(name, var) FOR_ALL_ITEMS_FROM(name, station_index, var, 0) if (name::IsExpected(var))
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257
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258 #endif /* STATION_BASE_H */