STYLE: Use default member initialization

Converts a default constructor’s member initializers into the new
default member initializers in C++11. Other member initializers that match the
default member initializer are removed. This can reduce repeated code or allow
use of ‘= default’.

SRCDIR=/Users/johnsonhj/src/jsoncpp/ #My local SRC
BLDDIR=/Users/johnsonhj/src/jsoncpp/cmake-build-debug/ #My local BLD

cd /Users/johnsonhj/src/jsoncpp/cmake-build-debug/
run-clang-tidy.py -extra-arg=-D__clang__ -checks=-*,modernize-use-default-member-init  -header-filter=.* -fix

Author: hjmjohnson

include/json/features.h

@@ -41,17 +41,17 @@ class JSON_API Features {
   Features();
 
   /// \c true if comments are allowed. Default: \c true.
-  bool allowComments_;
+  bool allowComments_{true};
 
   /// \c true if root must be either an array or an object value. Default: \c
   /// false.
-  bool strictRoot_;
+  bool strictRoot_{false};
 
   /// \c true if dropped null placeholders are allowed. Default: \c false.
-  bool allowDroppedNullPlaceholders_;
+  bool allowDroppedNullPlaceholders_{false};
 
   /// \c true if numeric object key are allowed. Default: \c false.
-  bool allowNumericKeys_;
+  bool allowNumericKeys_{false};
 };
 
 } // namespace Json

include/json/reader.h

@@ -242,14 +242,14 @@ class JSON_API Reader {
   Nodes nodes_;
   Errors errors_;
   JSONCPP_STRING document_;
-  Location begin_;
-  Location end_;
-  Location current_;
-  Location lastValueEnd_;
-  Value* lastValue_;
+  Location begin_{};
+  Location end_{};
+  Location current_{};
+  Location lastValueEnd_{};
+  Value* lastValue_{};
   JSONCPP_STRING commentsBefore_;
   Features features_;
-  bool collectComments_;
+  bool collectComments_{};
 }; // Reader
 
 /** Interface for reading JSON from a char array.

include/json/value.h

@@ -630,7 +630,7 @@ Json::Value obj_value(Json::objectValue); // {}
 
     void setComment(const char* text, size_t len);
 
-    char* comment_;
+    char* comment_{nullptr};
   };
 
   // struct MemberNamesTransform
@@ -678,8 +678,8 @@ class JSON_API PathArgument {
 private:
   enum Kind { kindNone = 0, kindIndex, kindKey };
   JSONCPP_STRING key_;
-  ArrayIndex index_;
-  Kind kind_;
+  ArrayIndex index_{};
+  Kind kind_{kindNone};
 };
 
 /** \brief Experimental and untested: represents a "path" to access a node.
@@ -780,7 +780,7 @@ class JSON_API ValueIteratorBase {
 private:
   Value::ObjectValues::iterator current_;
   // Indicates that iterator is for a null value.
-  bool isNull_;
+  bool isNull_{true};
 
 public:
   // For some reason, BORLAND needs these at the end, rather

include/json/writer.h

@@ -189,9 +189,9 @@ class JSONCPP_DEPRECATED("Use StreamWriterBuilder instead") JSON_API FastWriter
   void writeValue(const Value& value);
 
   JSONCPP_STRING document_;
-  bool yamlCompatibilityEnabled_;
-  bool dropNullPlaceholders_;
-  bool omitEndingLineFeed_;
+  bool yamlCompatibilityEnabled_{false};
+  bool dropNullPlaceholders_{false};
+  bool omitEndingLineFeed_{false};
 };
 #if defined(_MSC_VER)
 #pragma warning(pop)
@@ -257,9 +257,9 @@ class JSONCPP_DEPRECATED("Use StreamWriterBuilder instead") JSON_API
   ChildValues childValues_;
   JSONCPP_STRING document_;
   JSONCPP_STRING indentString_;
-  unsigned int rightMargin_;
-  unsigned int indentSize_;
-  bool addChildValues_;
+  unsigned int rightMargin_{74};
+  unsigned int indentSize_{3};
+  bool addChildValues_{false};
 };
 #if defined(_MSC_VER)
 #pragma warning(pop)
@@ -331,7 +331,7 @@ class JSONCPP_DEPRECATED("Use StreamWriterBuilder instead") JSON_API
   ChildValues childValues_;
   JSONCPP_OSTREAM* document_;
   JSONCPP_STRING indentString_;
-  unsigned int rightMargin_;
+  unsigned int rightMargin_{74};
   JSONCPP_STRING indentation_;
   bool addChildValues_ : 1;
   bool indented_ : 1;

src/lib_json/json_reader.cpp

@@ -60,8 +60,7 @@ typedef std::auto_ptr<CharReader> CharReaderPtr;
 // ////////////////////////////////
 
 Features::Features()
-    : allowComments_(true), strictRoot_(false),
-      allowDroppedNullPlaceholders_(false), allowNumericKeys_(false) {}
+     {}
 
 Features Features::all() { return {}; }
 
@@ -88,9 +87,8 @@ bool Reader::containsNewLine(Reader::Location begin, Reader::Location end) {
 // //////////////////////////////////////////////////////////////////
 
 Reader::Reader()
-    : errors_(), document_(), begin_(), end_(), current_(), lastValueEnd_(),
-      lastValue_(), commentsBefore_(), features_(Features::all()),
-      collectComments_() {}
+    : errors_(), document_(),  commentsBefore_(), features_(Features::all())
+      {}
 
 Reader::Reader(const Features& features)
     : errors_(), document_(), begin_(), end_(), current_(), lastValueEnd_(),

src/lib_json/json_value.cpp

@@ -233,7 +233,7 @@ JSONCPP_NORETURN void throwLogicError(JSONCPP_STRING const& msg) {
 // //////////////////////////////////////////////////////////////////
 // //////////////////////////////////////////////////////////////////
 
-Value::CommentInfo::CommentInfo() : comment_(nullptr) {}
+Value::CommentInfo::CommentInfo()  {}
 
 Value::CommentInfo::~CommentInfo() {
   if (comment_)
@@ -1575,7 +1575,7 @@ Value::iterator Value::end() {
 // class PathArgument
 // //////////////////////////////////////////////////////////////////
 
-PathArgument::PathArgument() : key_(), index_(), kind_(kindNone) {}
+PathArgument::PathArgument() : key_() {}
 
 PathArgument::PathArgument(ArrayIndex index)
     : key_(), index_(index), kind_(kindIndex) {}

src/lib_json/json_valueiterator.inl

@@ -16,7 +16,7 @@ namespace Json {
 // //////////////////////////////////////////////////////////////////
 
 ValueIteratorBase::ValueIteratorBase()
-    : current_(), isNull_(true) {
+    : current_() {
 }
 
 ValueIteratorBase::ValueIteratorBase(

src/lib_json/json_writer.cpp

@@ -352,8 +352,8 @@ Writer::~Writer() {}
 // //////////////////////////////////////////////////////////////////
 
 FastWriter::FastWriter()
-    : yamlCompatibilityEnabled_(false), dropNullPlaceholders_(false),
-      omitEndingLineFeed_(false) {}
+    
+      {}
 
 void FastWriter::enableYAMLCompatibility() { yamlCompatibilityEnabled_ = true; }
 
@@ -428,7 +428,7 @@ void FastWriter::writeValue(const Value& value) {
 // //////////////////////////////////////////////////////////////////
 
 StyledWriter::StyledWriter()
-    : rightMargin_(74), indentSize_(3), addChildValues_(false) {}
+     {}
 
 JSONCPP_STRING StyledWriter::write(const Value& root) {
   document_.clear();
@@ -643,7 +643,7 @@ bool StyledWriter::hasCommentForValue(const Value& value) {
 // //////////////////////////////////////////////////////////////////
 
 StyledStreamWriter::StyledStreamWriter(JSONCPP_STRING  indentation)
-    : document_(nullptr), rightMargin_(74), indentation_(std::move(indentation)),
+    : document_(nullptr),  indentation_(std::move(indentation)),
       addChildValues_(), indented_(false) {}
 
 void StyledStreamWriter::write(JSONCPP_OSTREAM& out, const Value& root) {

src/test_lib_json/jsontest.cpp

@@ -74,7 +74,7 @@ namespace JsonTest {
 // //////////////////////////////////////////////////////////////////
 
 TestResult::TestResult()
-    : predicateId_(1), lastUsedPredicateId_(0), messageTarget_(nullptr) {
+     {
   // The root predicate has id 0
   rootPredicateNode_.id_ = 0;
   rootPredicateNode_.next_ = nullptr;
@@ -207,7 +207,7 @@ TestResult& TestResult::operator<<(bool value) {
 // class TestCase
 // //////////////////////////////////////////////////////////////////
 
-TestCase::TestCase() : result_(nullptr) {}
+TestCase::TestCase()  {}
 
 TestCase::~TestCase() {}
 

src/test_lib_json/jsontest.h

@@ -60,7 +60,7 @@ class TestResult {
   /// Not encapsulated to prevent step into when debugging failed assertions
   /// Incremented by one on assertion predicate entry, decreased by one
   /// by addPredicateContext().
-  PredicateContext::Id predicateId_;
+  PredicateContext::Id predicateId_{1};
 
   /// \internal Implementation detail for predicate macros
   PredicateContext* predicateStackTail_;
@@ -109,9 +109,9 @@ class TestResult {
   Failures failures_;
   JSONCPP_STRING name_;
   PredicateContext rootPredicateNode_;
-  PredicateContext::Id lastUsedPredicateId_;
+  PredicateContext::Id lastUsedPredicateId_{0};
   /// Failure which is the target of the messages added using operator <<
-  Failure* messageTarget_;
+  Failure* messageTarget_{nullptr};
 };
 
 class TestCase {
@@ -125,7 +125,7 @@ class TestCase {
   virtual const char* testName() const = 0;
 
 protected:
-  TestResult* result_;
+  TestResult* result_{nullptr};
 
 private:
   virtual void runTestCase() = 0;

src/test_lib_json/main.cpp

@@ -82,19 +82,19 @@ struct ValueTest : JsonTest::TestCase {
     /// Initialize all checks to \c false by default.
     IsCheck();
 
-    bool isObject_;
-    bool isArray_;
-    bool isBool_;
-    bool isString_;
-    bool isNull_;
-
-    bool isInt_;
-    bool isInt64_;
-    bool isUInt_;
-    bool isUInt64_;
-    bool isIntegral_;
-    bool isDouble_;
-    bool isNumeric_;
+    bool isObject_{false};
+    bool isArray_{false};
+    bool isBool_{false};
+    bool isString_{false};
+    bool isNull_{false};
+
+    bool isInt_{false};
+    bool isInt64_{false};
+    bool isUInt_{false};
+    bool isUInt64_{false};
+    bool isIntegral_{false};
+    bool isDouble_{false};
+    bool isNumeric_{false};
   };
 
   void checkConstMemberCount(const Json::Value& value,
@@ -1331,10 +1331,8 @@ void ValueTest::checkMemberCount(Json::Value& value,
 }
 
 ValueTest::IsCheck::IsCheck()
-    : isObject_(false), isArray_(false), isBool_(false), isString_(false),
-      isNull_(false), isInt_(false), isInt64_(false), isUInt_(false),
-      isUInt64_(false), isIntegral_(false), isDouble_(false),
-      isNumeric_(false) {}
+    
+      {}
 
 void ValueTest::checkIs(const Json::Value& value, const IsCheck& check) {
   JSONTEST_ASSERT_EQUAL(check.isObject_, value.isObject());