clang-tidy fixes (#1033)

* [clang-tidy] Replace C typedef with C++ using

Found with modernize-use-using

Added to .clang-tidy file.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

* [clang-tidy] Remove redundant member init

Found with readability-redundant-member-init

Added to .clang-tidy

* [clang-tidy] Replace C casts with C++ ones

Found with google-readability-casting

Signed-off-by: Rosen Penev <rosenp@gmail.com>

* [clang-tidy] Use default member init

Found with modernize-use-default-member-init

Signed-off-by: Rosen Penev <rosenp@gmail.com>

.clang-tidy

@@ -0,0 +1,11 @@
+---
+Checks:          'google-readability-casting,modernize-use-default-member-init,modernize-use-using,readability-redundant-member-init'
+WarningsAsErrors: ''
+HeaderFilterRegex: ''
+AnalyzeTemporaryDtors: false
+FormatStyle:     none
+CheckOptions:    
+  - key:             modernize-use-using.IgnoreMacros
+    value:           '0'
+...
+

src/lib_json/json_reader.cpp

@@ -51,7 +51,7 @@ static size_t const stackLimit_g =
 namespace Json {
 
 #if __cplusplus >= 201103L || (defined(_CPPLIB_VER) && _CPPLIB_VER >= 520)
-typedef std::unique_ptr<CharReader> CharReaderPtr;
+using CharReaderPtr = std::unique_ptr<CharReader>;
 #else
 typedef std::auto_ptr<CharReader> CharReaderPtr;
 #endif
@@ -86,11 +86,10 @@ bool Reader::containsNewLine(Reader::Location begin, Reader::Location end) {
 // //////////////////////////////////////////////////////////////////
 
 Reader::Reader()
-    : errors_(), document_(), commentsBefore_(), features_(Features::all()) {}
+    :  features_(Features::all()) {}
 
 Reader::Reader(const Features& features)
-    : errors_(), document_(), begin_(), end_(), current_(), lastValueEnd_(),
-      lastValue_(), commentsBefore_(), features_(features), collectComments_() {
+    :    features_(features) {
 }
 
 bool Reader::parse(const std::string& document,
@@ -111,7 +110,7 @@ bool Reader::parse(std::istream& is, Value& root, bool collectComments) {
   // Since String is reference-counted, this at least does not
   // create an extra copy.
   String doc;
-  std::getline(is, doc, (char)EOF);
+  std::getline(is, doc, static_cast<char>EOF);
   return parse(doc.data(), doc.data() + doc.size(), root, collectComments);
 }
 
@@ -895,8 +894,8 @@ OurFeatures OurFeatures::all() { return {}; }
 // for implementing JSON reading.
 class OurReader {
 public:
-  typedef char Char;
-  typedef const Char* Location;
+  using Char = char;
+  using Location = const Char *;
   struct StructuredError {
     ptrdiff_t offset_start;
     ptrdiff_t offset_limit;
@@ -952,7 +951,7 @@ private:
     Location extra_;
   };
 
-  typedef std::deque<ErrorInfo> Errors;
+  using Errors = std::deque<ErrorInfo>;
 
   bool readToken(Token& token);
   void skipSpaces();
@@ -997,7 +996,7 @@ private:
   static String normalizeEOL(Location begin, Location end);
   static bool containsNewLine(Location begin, Location end);
 
-  typedef std::stack<Value*> Nodes;
+  using Nodes = std::stack<Value *>;
   Nodes nodes_;
   Errors errors_;
   String document_;
@@ -1023,8 +1022,8 @@ bool OurReader::containsNewLine(OurReader::Location begin,
 }
 
 OurReader::OurReader(OurFeatures const& features)
-    : errors_(), document_(), begin_(), end_(), current_(), lastValueEnd_(),
-      lastValue_(), commentsBefore_(), features_(features), collectComments_() {
+    :  begin_(), end_(), current_(), lastValueEnd_(),
+      lastValue_(),  features_(features), collectComments_() {
 }
 
 bool OurReader::parse(const char* beginDoc,

src/lib_json/json_value.cpp

@@ -1547,16 +1547,16 @@ Value::iterator Value::end() {
 // class PathArgument
 // //////////////////////////////////////////////////////////////////
 
-PathArgument::PathArgument() : key_() {}
+PathArgument::PathArgument()  {}
 
 PathArgument::PathArgument(ArrayIndex index)
-    : key_(), index_(index), kind_(kindIndex) {}
+    :  index_(index), kind_(kindIndex) {}
 
 PathArgument::PathArgument(const char* key)
-    : key_(key), index_(), kind_(kindKey) {}
+    : key_(key),  kind_(kindKey) {}
 
 PathArgument::PathArgument(const String& key)
-    : key_(key.c_str()), index_(), kind_(kindKey) {}
+    : key_(key.c_str()),  kind_(kindKey) {}
 
 // class Path
 // //////////////////////////////////////////////////////////////////

src/lib_json/json_writer.cpp

@@ -84,7 +84,7 @@
 namespace Json {
 
 #if __cplusplus >= 201103L || (defined(_CPPLIB_VER) && _CPPLIB_VER >= 520)
-typedef std::unique_ptr<StreamWriter> StreamWriterPtr;
+using StreamWriterPtr = std::unique_ptr<StreamWriter>;
 #else
 typedef std::auto_ptr<StreamWriter> StreamWriterPtr;
 #endif
@@ -887,7 +887,7 @@ private:
   void writeCommentAfterValueOnSameLine(Value const& root);
   static bool hasCommentForValue(const Value& value);
 
-  typedef std::vector<String> ChildValues;
+  using ChildValues = std::vector<String>;
 
   ChildValues childValues_;
   String indentString_;