cpp/openttd-patchpack/source Changeset - r14772:59c9e3e72143

Changeset - r14772:59c9e3e72143

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alberth - 15 years ago 2010-03-07 18:29:53
alberth@openttd.org

(svn r19370) -Codechange: EnsureNoTrainOnTrack() returns a CommandCost.

1 file changed with 16 insertions and 14 deletions:

src/rail_cmd.cpp

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src/rail_cmd.cpp

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@@ @@ -147,20 +147,18 @@ static const byte _track_sloped_sprites[ @@
 /**
  * Tests if a vehicle interacts with the specified track.
  * All track bits interact except parallel #TRACK_BIT_HORZ or #TRACK_BIT_VERT.
+ *
  * @param tile The tile.
  * @param track The track.
- * @return \c true if no train that interacts, is found. \c false if a train is found.
+ * @return Succeeded command (no train found), or a failed command (a train was found).
  */
-static bool EnsureNoTrainOnTrack(TileIndex tile, Track track)
+static CommandCost EnsureNoTrainOnTrack(TileIndex tile, Track track)
+{
 	TrackBits rail_bits = TrackToTrackBits(track);
 	CommandCost ret = EnsureNoTrainOnTrackBits(tile, rail_bits);
 	ret.SetGlobalErrorMessage();
 	return ret.Succeeded();
 	return EnsureNoTrainOnTrackBits(tile, rail_bits);
+}
 /** Check that the new track bits may be built.
  * @param tile %Tile to build on.
  * @param to_build New track bits.
  * @param flags    Flags of the operation.
@@ @@ -372,17 +370,16 @@ CommandCost CmdBuildSingleRail(TileIndex @@
 			if (!IsPlainRail(tile)) return CMD_ERROR;
 			if (!IsCompatibleRail(GetRailType(tile), railtype)) return_cmd_error(STR_ERROR_IMPOSSIBLE_TRACK_COMBINATION);
 			CommandCost ret = CheckTrackCombination(tile, trackbit, flags);
 			if (ret.Succeeded()) ret = EnsureNoTrainOnTrack(tile, track);
 			ret.SetGlobalErrorMessage();
 			if (ret.Failed()) return ret;
 			if (!EnsureNoTrainOnTrack(tile, track)) return CMD_ERROR;
 			ret = CheckRailSlope(tileh, trackbit, GetTrackBits(tile), tile);
 			if (ret.Failed()) return ret;
 			cost.AddCost(ret);
 			/* If the rail types don't match, try to convert only if engines of
 			 * the new rail type are not powered on the present rail type and engines of
@@ @@ -539,17 +536,17 @@ CommandCost CmdRemoveSingleRail(TileInde @@
 			break;
+		}
 		case MP_RAILWAY: {
 			TrackBits present;
 			if (!IsPlainRail(tile) ||
 					(_current_company != OWNER_WATER && !CheckTileOwnership(tile)) ||
 					!EnsureNoTrainOnTrack(tile, track)) {
 				return CMD_ERROR;
+			}
 			if (!IsPlainRail(tile) || (_current_company != OWNER_WATER && !CheckTileOwnership(tile))) return CMD_ERROR;
 			CommandCost ret = EnsureNoTrainOnTrack(tile, track);
 			ret.SetGlobalErrorMessage();
 			if (ret.Failed()) return ret;
 			present = GetTrackBits(tile);
 			if ((present & trackbit) == 0) return CMD_ERROR;
 			if (present == (TRACK_BIT_X | TRACK_BIT_Y)) crossing = true;
 			/* Charge extra to remove signals on the track, if they are there */
@@ @@ -896,15 +893,18 @@ CommandCost CmdBuildSingleSignal(TileInd @@
 	uint num_dir_cycle = GB(p1, 15, 2);
 	if (sigtype > SIGTYPE_LAST) return CMD_ERROR;
 	/* You can only build signals on plain rail tiles, and the selected track must exist */
 	if (!ValParamTrackOrientation(track) || !IsPlainRailTile(tile) ||
-			!HasTrack(tile, track) || !EnsureNoTrainOnTrack(tile, track)) {
 			!HasTrack(tile, track)) {
 		return CMD_ERROR;
+	}
 	CommandCost ret = EnsureNoTrainOnTrack(tile, track);
 	ret.SetGlobalErrorMessage();
 	if (ret.Failed()) return ret;
 	/* Protect against invalid signal copying */
 	if (p2 != 0 && (p2 & SignalOnTrack(track)) == 0) return CMD_ERROR;
 	if (!CheckTileOwnership(tile)) return CMD_ERROR;
@@ @@ -1254,16 +1254,18 @@ CommandCost CmdRemoveSingleSignal(TileIn @@
+{
 	Track track = (Track)GB(p1, 0, 3);
 	if (!ValParamTrackOrientation(track) ||
 			!IsPlainRailTile(tile) ||
 			!HasTrack(tile, track) ||
 			!EnsureNoTrainOnTrack(tile, track) ||
 			!HasSignalOnTrack(tile, track)) {
 		return CMD_ERROR;
+	}
 	CommandCost ret = EnsureNoTrainOnTrack(tile, track);
 	ret.SetGlobalErrorMessage();
 	if (ret.Failed()) return ret;
 	/* Only water can remove signals from anyone */
 	if (_current_company != OWNER_WATER && !CheckTileOwnership(tile)) return CMD_ERROR;
 	/* Do it? */
 	if (flags & DC_EXEC) {

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