Codechange: use const auto & instead of making a copy

src/script/script_scanner.cpp

@@ -205,7 +205,7 @@ static bool IsSameScript(const ContentInfo *ci, bool md5sum, ScriptInfo *info, S
 	if (!md5sum) return true;
 
 	ScriptFileChecksumCreator checksum(dir);
-	auto tar_filename = info->GetTarFile();
+	const auto &tar_filename = info->GetTarFile();
 	TarList::iterator iter;
 	if (!tar_filename.empty() && (iter = _tar_list[dir].find(tar_filename)) != _tar_list[dir].end()) {
 		/* The main script is in a tar file, so find all files that

src/settings.cpp

@@ -189,7 +189,7 @@ size_t OneOfManySettingDesc::ParseSingleValue(const char *str, size_t len, const
 	if (isdigit(*str)) return std::strtoul(str, nullptr, 0);
 
 	size_t idx = 0;
-	for (auto one : many) {
+	for (const auto &one : many) {
 		if (one.size() == len && strncmp(one.c_str(), str, len) == 0) return idx;
 		idx++;
 	}

src/survey.cpp

@@ -146,7 +146,7 @@ static void SurveySettingsTable(nlohmann::json &survey, const SettingTable &tabl
 		/* Skip any old settings we no longer save/load. */
 		if (!SlIsObjectCurrentlyValid(sd->save.version_from, sd->save.version_to)) continue;
 
-		auto name = sd->GetName();
+		const auto &name = sd->GetName();
 		if (skip_if_default && sd->IsDefaultValue(object)) continue;
 		survey[name] = sd->FormatValue(object);
 	}

src/tests/landscape_partial_pixel_z.cpp

@@ -85,7 +85,7 @@ TEST_CASE("PartialPixelSlopeAdditionTest - A half tile steep slope is a one corn
  * @param expected The expect partial pixels Z values.
  * @return True iff at all GetPartialPixelZ results are the same as the expected Z-coordinates.
  */
-bool CheckPartialPixelZ(Slope slope, std::array<int, TILE_SIZE * TILE_SIZE> expected)
+bool CheckPartialPixelZ(Slope slope, const std::array<int, TILE_SIZE * TILE_SIZE> &expected)
 {
 	for (uint i = 0; i < expected.size(); i++) {
 		int actual = GetPartialPixelZ(GB(i, 4, 4), GB(i, 0, 4), slope);

src/town_gui.cpp

@@ -1599,7 +1599,7 @@ public:
 	{
 		if (src.empty()) return src;
 
-		const auto specs = HouseSpec::Specs();
+		const auto &specs = HouseSpec::Specs();
 		std::set<PickerItem> dst;
 		for (const auto &item : src) {
 			if (item.grfid == 0) {