(svn r23457) -Codechange: introduce Industry::TileBelongsToIndustry() to simplify code checking for that

src/industry.h

@@ -77,6 +77,16 @@ struct Industry : IndustryPool::PoolItem<&_industry_pool> {
 
 	void RecomputeProductionMultipliers();
 
+	/**
+	 * Check if a given tile belongs to this industry.
+	 * @param tile The tile to check.
+	 * @return True if the tils is part of this industry.
+	 */
+	inline bool TileBelongsToIndustry(TileIndex tile) const
+	{
+		return IsTileType(tile, MP_INDUSTRY) && GetIndustryIndex(tile) == this->index;
+	}
+
 	/**
 	 * Get the industry of the given tile
 	 * @param tile the tile to get the industry from