CXX-3198 modernize ClangFormat configuration options (#1306)

* format: set ColumnLimit: 120
* format: set AlignAfterOpenBracket: AlwaysBreak
* format: set AllowAllParametersOfDeclarationOnNextLine: false
* format: set QualifierAlignment: Right
* format: set SpacesBeforeTrailingComments: 1
* format: set ShortNamespaceLines: 0
* format: set KeepEmptyLines.AtStartOfFile: false
* Address GCC -fpermissive error due to `view` declaration conflict
* Manually fix qualifier alignments missed by ClangFormat

Author: eramongodb

Diff for: .clang-format

@@ -1,7 +1,7 @@
 ---
 Language:        Cpp
 AccessModifierOffset: -1
-AlignAfterOpenBracket: Align
+AlignAfterOpenBracket: AlwaysBreak
 AlignArrayOfStructures: None
 AlignConsecutiveAssignments:
   Enabled:         false
@@ -64,7 +64,7 @@ AlignTrailingComments:
   Kind:            Always
   OverEmptyLines:  0
 AllowAllArgumentsOnNextLine: true
-AllowAllParametersOfDeclarationOnNextLine: true
+AllowAllParametersOfDeclarationOnNextLine: false
 AllowBreakBeforeNoexceptSpecifier: Never
 AllowShortBlocksOnASingleLine: Never
 AllowShortCaseExpressionOnASingleLine: true
@@ -126,7 +126,7 @@ BreakFunctionDefinitionParameters: false
 BreakInheritanceList: BeforeColon
 BreakStringLiterals: true
 BreakTemplateDeclarations: Yes
-ColumnLimit:     100
+ColumnLimit:     120
 CommentPragmas:  '^\s*(@(addtogroup|copydoc|defgroup|fn|ref)|- )'
 CompactNamespaces: false
 ConstructorInitializerIndentWidth: 4
@@ -190,7 +190,7 @@ JavaScriptWrapImports: true
 KeepEmptyLines:
   AtEndOfFile:     false
   AtStartOfBlock:  false
-  AtStartOfFile:   true
+  AtStartOfFile:   false
 LambdaBodyIndentation: Signature
 LineEnding:      DeriveLF
 MacroBlockBegin: ''
@@ -217,7 +217,7 @@ PenaltyIndentedWhitespace: 0
 PenaltyReturnTypeOnItsOwnLine: 200
 PointerAlignment: Left
 PPIndentWidth:   -1
-QualifierAlignment: Left
+QualifierAlignment: Right
 RawStringFormats: []
 ReferenceAlignment: Pointer
 ReflowComments:  true
@@ -227,7 +227,7 @@ RemoveSemicolon: false
 RequiresClausePosition: OwnLine
 RequiresExpressionIndentation: OuterScope
 SeparateDefinitionBlocks: Leave
-ShortNamespaceLines: 1
+ShortNamespaceLines: 0
 SkipMacroDefinitionBody: false
 SortIncludes:    CaseSensitive
 SortJavaStaticImport: Before
@@ -257,7 +257,7 @@ SpaceBeforeParensOptions:
 SpaceBeforeRangeBasedForLoopColon: true
 SpaceBeforeSquareBrackets: false
 SpaceInEmptyBlock: false
-SpacesBeforeTrailingComments: 2
+SpacesBeforeTrailingComments: 1
 SpacesInAngles:  Never
 SpacesInContainerLiterals: true
 SpacesInLineCommentPrefix:

Diff for: benchmark/benchmark_runner.cpp

@@ -47,29 +47,25 @@ namespace benchmark {
 // The task sizes and iteration numbers come from the Driver Perfomance Benchmarking Reference Doc.
 benchmark_runner::benchmark_runner(std::set<benchmark_type> types) : _types{types} {
     // Bson microbenchmarks
-    _microbenches.push_back(
-        std::make_unique<bson_encoding>("TestFlatEncoding", 75.31, "extended_bson/flat_bson.json"));
-    _microbenches.push_back(
-        std::make_unique<bson_encoding>("TestDeepEncoding", 19.64, "extended_bson/deep_bson.json"));
-    _microbenches.push_back(
-        std::make_unique<bson_encoding>("TestFullEncoding", 57.34, "extended_bson/full_bson.json"));
+    _microbenches.push_back(std::make_unique<bson_encoding>("TestFlatEncoding", 75.31, "extended_bson/flat_bson.json"));
+    _microbenches.push_back(std::make_unique<bson_encoding>("TestDeepEncoding", 19.64, "extended_bson/deep_bson.json"));
+    _microbenches.push_back(std::make_unique<bson_encoding>("TestFullEncoding", 57.34, "extended_bson/full_bson.json"));
     // TODO CXX-1241: Add bson_decoding equivalents.
 
     // Single doc microbenchmarks
     _microbenches.push_back(std::make_unique<run_command>());
-    _microbenches.push_back(
-        std::make_unique<find_one_by_id>("single_and_multi_document/tweet.json"));
+    _microbenches.push_back(std::make_unique<find_one_by_id>("single_and_multi_document/tweet.json"));
     _microbenches.push_back(std::make_unique<insert_one>(
         "TestSmallDocInsertOne", 2.75, iterations, "single_and_multi_document/small_doc.json"));
-    _microbenches.push_back(std::make_unique<insert_one>(
-        "TestLargeDocInsertOne", 27.31, 10, "single_and_multi_document/large_doc.json"));
+    _microbenches.push_back(
+        std::make_unique<insert_one>("TestLargeDocInsertOne", 27.31, 10, "single_and_multi_document/large_doc.json"));
 
     // Multi doc microbenchmarks
     _microbenches.push_back(std::make_unique<find_many>("single_and_multi_document/tweet.json"));
     _microbenches.push_back(std::make_unique<bulk_insert>(
         "TestSmallDocBulkInsert", 2.75, iterations, "single_and_multi_document/small_doc.json"));
-    _microbenches.push_back(std::make_unique<bulk_insert>(
-        "TestLargeDocBulkInsert", 27.31, 10, "single_and_multi_document/large_doc.json"));
+    _microbenches.push_back(
+        std::make_unique<bulk_insert>("TestLargeDocBulkInsert", 27.31, 10, "single_and_multi_document/large_doc.json"));
     // CXX-2794: Disable GridFS benchmarks due to long runtime
     // _microbenches.push_back(
     //     std::make_unique<gridfs_upload>("single_and_multi_document/gridfs_large.bin"));
@@ -86,13 +82,10 @@ benchmark_runner::benchmark_runner(std::set<benchmark_type> types) : _types{type
     // Need to remove some
     if (!_types.empty()) {
         for (auto&& it = _microbenches.begin(); it != _microbenches.end();) {
-            const std::set<benchmark_type>& tags = (*it)->get_tags();
+            std::set<benchmark_type> const& tags = (*it)->get_tags();
             std::set<benchmark_type> intersect;
-            std::set_intersection(tags.begin(),
-                                  tags.end(),
-                                  _types.begin(),
-                                  _types.end(),
-                                  std::inserter(intersect, intersect.begin()));
+            std::set_intersection(
+                tags.begin(), tags.end(), _types.begin(), _types.end(), std::inserter(intersect, intersect.begin()));
 
             if (intersect.empty()) {
                 _microbenches.erase(it);
@@ -112,8 +105,7 @@ void benchmark_runner::run_microbenches() {
 
         auto score = bench->get_results();
 
-        std::cout << bench->get_name() << ": "
-                  << static_cast<double>(score.get_percentile(50).count()) / 1000.0
+        std::cout << bench->get_name() << ": " << static_cast<double>(score.get_percentile(50).count()) / 1000.0
                   << " second(s) | " << score.get_score() << " MB/s" << std::endl
                   << std::endl;
     }
@@ -168,12 +160,9 @@ void benchmark_runner::write_scores() {
     using builder::basic::sub_document;
 
     auto doc = builder::basic::document{};
-    doc.append(kvp("info", [](sub_document subdoc) {
-        subdoc.append(kvp("test_name", "C++ Driver microbenchmarks"));
-    }));
+    doc.append(kvp("info", [](sub_document subdoc) { subdoc.append(kvp("test_name", "C++ Driver microbenchmarks")); }));
 
-    auto write_time =
-        [](const std::chrono::time_point<std::chrono::system_clock> t) -> std::string {
+    auto write_time = [](std::chrono::time_point<std::chrono::system_clock> const t) -> std::string {
         std::time_t t1 = std::chrono::system_clock::to_time_t(t);
         std::ostringstream oss;
         oss << std::put_time(std::gmtime(&t1), "%Y-%m-%dT%H:%M:%S") << "+00:00";
@@ -189,10 +178,10 @@ void benchmark_runner::write_scores() {
     std::cout << "Individual microbenchmark scores:" << std::endl << "===========" << std::endl;
     for (auto&& bench : _microbenches) {
         auto& score = bench->get_results();
-        const auto bench_time = static_cast<double>(score.get_percentile(50).count()) / 1000.0;
+        auto const bench_time = static_cast<double>(score.get_percentile(50).count()) / 1000.0;
 
-        std::cout << bench->get_name() << ": " << bench_time << " seconds | " << score.get_score()
-                  << " MB/s" << std::endl;
+        std::cout << bench->get_name() << ": " << bench_time << " seconds | " << score.get_score() << " MB/s"
+                  << std::endl;
 
         auto metric_doc = builder::basic::document{};
         metric_doc.append(kvp("name", bench->get_name()));
@@ -232,4 +221,4 @@ void benchmark_runner::write_scores() {
     std::ofstream os{"results.json"};
     os << '[' << bsoncxx::to_json(doc.view()) << ']';
 }
-}  // namespace benchmark
+} // namespace benchmark

Diff for: benchmark/benchmark_runner.hpp

@@ -54,4 +54,4 @@ class benchmark_runner {
     std::vector<std::unique_ptr<microbench>> _microbenches;
     std::set<benchmark_type> _types;
 };
-}  // namespace benchmark
+} // namespace benchmark

Diff for: benchmark/bson/bson_decoding.hpp

@@ -23,9 +23,7 @@ class bson_decoding : public microbench {
     bson_decoding() = delete;
 
     bson_decoding(std::string name, double task_size, std::string json_file)
-        : microbench{std::move(name),
-                     task_size,
-                     std::set<benchmark_type>{benchmark_type::bson_bench}},
+        : microbench{std::move(name), task_size, std::set<benchmark_type>{benchmark_type::bson_bench}},
           _file_name{std::move(json_file)} {}
 
    protected:
@@ -46,4 +44,4 @@ void bson_decoding::task() {
         // TODO CXX-1241: call bson_as_extended json on _json.
     }
 }
-}  // namespace benchmark
+} // namespace benchmark

Diff for: benchmark/bson/bson_encoding.hpp

@@ -28,9 +28,7 @@ class bson_encoding : public microbench {
     bson_encoding() = delete;
 
     bson_encoding(std::string name, double task_size, std::string json_file)
-        : microbench{std::move(name),
-                     task_size,
-                     std::set<benchmark_type>{benchmark_type::bson_bench}},
+        : microbench{std::move(name), task_size, std::set<benchmark_type>{benchmark_type::bson_bench}},
           _json_file{std::move(json_file)} {}
 
    protected:
@@ -64,4 +62,4 @@ void bson_encoding::task() {
 }
 
 void bson_encoding::teardown() {}
-}  // namespace benchmark
+} // namespace benchmark

Diff for: benchmark/main.cpp

@@ -32,7 +32,7 @@ int main(int argc, char* argv[]) {
 
     if (argc > 1) {
         if (bsoncxx::stdx::string_view(argv[1]) == "all") {
-            for (const auto& [name, type] : names_types) {
+            for (auto const& [name, type] : names_types) {
                 types.insert(type);
             }
         } else {

Diff for: benchmark/microbench.cpp

@@ -21,8 +21,7 @@
 
 namespace benchmark {
 
-bool finished_running(const std::chrono::duration<std::uint32_t, std::milli>& curr_time,
-                      std::uint32_t iter) {
+bool finished_running(std::chrono::duration<std::uint32_t, std::milli> const& curr_time, std::uint32_t iter) {
     return (curr_time > maxtime || (curr_time > mintime && iter > max_iter));
 }
 
@@ -44,7 +43,7 @@ void microbench::run() {
     teardown();
 }
 
-std::vector<std::string> parse_json_file_to_strings(const std::string& json_file) {
+std::vector<std::string> parse_json_file_to_strings(std::string const& json_file) {
     std::vector<std::string> jsons;
     std::ifstream stream{"data/benchmark/" + json_file};
 
@@ -60,7 +59,7 @@ std::vector<std::string> parse_json_file_to_strings(const std::string& json_file
     return jsons;
 }
 
-std::vector<bsoncxx::document::value> parse_json_file_to_documents(const std::string& json_file) {
+std::vector<bsoncxx::document::value> parse_json_file_to_documents(std::string const& json_file) {
     std::vector<bsoncxx::document::value> docs;
     std::ifstream stream{"data/benchmark/" + json_file};
 
@@ -79,12 +78,11 @@ std::vector<bsoncxx::document::value> parse_json_file_to_documents(const std::st
     return docs;
 }
 
-std::vector<std::string> parse_documents_to_bson(
-    const std::vector<bsoncxx::document::value>& docs) {
+std::vector<std::string> parse_documents_to_bson(std::vector<bsoncxx::document::value> const& docs) {
     std::vector<std::string> bsons;
     for (std::uint32_t i = 0; i < docs.size(); i++) {
         bsons.push_back(bsoncxx::to_json(docs[i]));
     }
     return bsons;
 }
-}  // namespace benchmark
+} // namespace benchmark

Diff for: benchmark/microbench.hpp

@@ -37,7 +37,7 @@ enum class benchmark_type {
     run_command_bench,
 };
 
-static const std::unordered_map<benchmark_type, std::string> type_names = {
+static std::unordered_map<benchmark_type, std::string> const type_names = {
     {benchmark_type::bson_bench, "BSONBench"},
     {benchmark_type::single_bench, "SingleBench"},
     {benchmark_type::multi_bench, "MultiBench"},
@@ -46,7 +46,7 @@ static const std::unordered_map<benchmark_type, std::string> type_names = {
     {benchmark_type::write_bench, "WriteBench"},
     {benchmark_type::run_command_bench, "RunCommandBench"}};
 
-static const std::unordered_map<std::string, benchmark_type> names_types = {
+static std::unordered_map<std::string, benchmark_type> const names_types = {
     {"BSONBench", benchmark_type::bson_bench},
     {"SingleBench", benchmark_type::single_bench},
     {"MultiBench", benchmark_type::multi_bench},
@@ -72,8 +72,8 @@ class microbench {
 
     microbench(microbench&&) = default;
     microbench& operator=(microbench&&) = default;
-    microbench(const microbench&) = default;
-    microbench& operator=(const microbench&) = default;
+    microbench(microbench const&) = default;
+    microbench& operator=(microbench const&) = default;
 
     void run();
 
@@ -85,7 +85,7 @@ class microbench {
         return _score;
     }
 
-    const std::set<benchmark_type>& get_tags() {
+    std::set<benchmark_type> const& get_tags() {
         return _tags;
     }
 
@@ -109,9 +109,9 @@ class microbench {
     std::string _name;
 };
 
-std::vector<std::string> parse_json_file_to_strings(const std::string& json_file);
+std::vector<std::string> parse_json_file_to_strings(std::string const& json_file);
 
-std::vector<bsoncxx::document::value> parse_json_file_to_documents(const std::string& json_file);
+std::vector<bsoncxx::document::value> parse_json_file_to_documents(std::string const& json_file);
 
-std::vector<std::string> parse_documents_to_bson(const std::vector<bsoncxx::document::value>& docs);
-}  // namespace benchmark
+std::vector<std::string> parse_documents_to_bson(std::vector<bsoncxx::document::value> const& docs);
+} // namespace benchmark

Diff for: benchmark/multi_doc/bulk_insert.hpp

@@ -36,10 +36,7 @@ class bulk_insert : public microbench {
     bulk_insert() = delete;
 
     bulk_insert(std::string name, double task_size, std::int32_t doc_num, std::string json_file)
-        : microbench{std::move(name),
-                     task_size,
-                     std::set<benchmark_type>{benchmark_type::multi_bench,
-                                              benchmark_type::write_bench}},
+        : microbench{std::move(name), task_size, std::set<benchmark_type>{benchmark_type::multi_bench, benchmark_type::write_bench}},
           _conn{mongocxx::uri{}},
           _doc_num{doc_num},
           _file_name{std::move(json_file)} {}
@@ -85,4 +82,4 @@ void bulk_insert::teardown() {
 void bulk_insert::task() {
     _coll.insert_many(_docs);
 }
-}  // namespace benchmark
+} // namespace benchmark

Diff for: benchmark/multi_doc/find_many.hpp

@@ -33,10 +33,7 @@ class find_many : public microbench {
    public:
     // The task size comes from the Driver Perfomance Benchmarking Reference Doc.
     find_many(std::string json_file)
-        : microbench{"TestFindManyAndEmptyCursor",
-                     16.22,
-                     std::set<benchmark_type>{benchmark_type::multi_bench,
-                                              benchmark_type::read_bench}},
+        : microbench{"TestFindManyAndEmptyCursor", 16.22, std::set<benchmark_type>{benchmark_type::multi_bench, benchmark_type::read_bench}},
           _conn{mongocxx::uri{}},
           _json_file{std::move(json_file)} {}
 
@@ -74,4 +71,4 @@ void find_many::task() {
     for ([[maybe_unused]] auto&& doc : cursor) {
     }
 }
-}  // namespace benchmark
+} // namespace benchmark

Diff for: benchmark/multi_doc/gridfs_download.hpp

@@ -36,10 +36,7 @@ class gridfs_download : public microbench {
    public:
     // The task size comes from the Driver Perfomance Benchmarking Reference Doc.
     gridfs_download(std::string file_name)
-        : microbench{"TestGridFsDownload",
-                     52.43,
-                     std::set<benchmark_type>{benchmark_type::multi_bench,
-                                              benchmark_type::read_bench}},
+        : microbench{"TestGridFsDownload", 52.43, std::set<benchmark_type>{benchmark_type::multi_bench, benchmark_type::read_bench}},
           _conn{mongocxx::uri{}},
           _file_name{std::move(file_name)} {}
 
@@ -77,8 +74,7 @@ void gridfs_download::task() {
     auto buffer_size = std::min(file_length, static_cast<std::int64_t>(downloader.chunk_size()));
     auto buffer = std::make_unique<std::uint8_t[]>(static_cast<std::size_t>(buffer_size));
 
-    while ([[maybe_unused]] auto length_read =
-               downloader.read(buffer.get(), static_cast<std::size_t>(buffer_size))) {
+    while ([[maybe_unused]] auto length_read = downloader.read(buffer.get(), static_cast<std::size_t>(buffer_size))) {
     }
 }
-}  // namespace benchmark
+} // namespace benchmark

Diff for: benchmark/multi_doc/gridfs_upload.hpp

@@ -34,10 +34,7 @@ class gridfs_upload : public microbench {
    public:
     // The task size comes from the Driver Perfomance Benchmarking Reference Doc.
     gridfs_upload(std::string file_name)
-        : microbench{"TestGridFsUpload",
-                     52.43,
-                     std::set<benchmark_type>{benchmark_type::multi_bench,
-                                              benchmark_type::write_bench}},
+        : microbench{"TestGridFsUpload", 52.43, std::set<benchmark_type>{benchmark_type::multi_bench, benchmark_type::write_bench}},
           _conn{mongocxx::uri{}},
           _file_name{file_name} {}
 
@@ -60,8 +57,8 @@ class gridfs_upload : public microbench {
 void gridfs_upload::setup() {
     std::ifstream stream{_file_name};
     stream >> std::noskipws;
-    _gridfs_file = std::vector<std::uint8_t>{(std::istream_iterator<unsigned char>{stream}),
-                                             (std::istream_iterator<unsigned char>{})};
+    _gridfs_file = std::vector<std::uint8_t>{
+        (std::istream_iterator<unsigned char>{stream}), (std::istream_iterator<unsigned char>{})};
 
     mongocxx::database db = _conn["perftest"];
     db.drop();
@@ -87,4 +84,4 @@ void gridfs_upload::task() {
     uploader.write(_gridfs_file.data(), _gridfs_file.size());
     uploader.close();
 }
-}  // namespace benchmark
+} // namespace benchmark