diff --git a/CMakeLists.txt b/CMakeLists.txt
index e41a814..fb522f9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -165,7 +165,7 @@ if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR
 		set(GCC_EXTRA_OPTIONS "${GCC_EXTRA_OPTIONS} -fPIC")
 	endif()
 	#
-	set(FLAG_TESTED "-Wextra")
+	set(FLAG_TESTED "-Wextra -Wshadow -Weffc++ -pedantic -pedantic-errors")
 	check_cxx_compiler_flag(${FLAG_TESTED} FLAG_WEXTRA)
 	if(FLAG_WEXTRA)
 		set(GCC_EXTRA_OPTIONS "${GCC_EXTRA_OPTIONS} ${FLAG_TESTED}")
diff --git a/include/yaml-cpp/binary.h b/include/yaml-cpp/binary.h
index 29d5dbd..7b536c8 100644
--- a/include/yaml-cpp/binary.h
+++ b/include/yaml-cpp/binary.h
@@ -19,9 +19,13 @@ YAML_CPP_API std::vector<unsigned char> DecodeBase64(const std::string &input);
 
 class YAML_CPP_API Binary {
  public:
-  Binary() : m_unownedData(0), m_unownedSize(0) {}
   Binary(const unsigned char *data_, std::size_t size_)
-      : m_unownedData(data_), m_unownedSize(size_) {}
+      : m_data{}, m_unownedData(data_), m_unownedSize(size_) {}
+  Binary() : Binary(nullptr, 0) {}
+  Binary(const Binary&) = default;
+  Binary(Binary&&) = default;
+  Binary& operator=(const Binary&) = default;
+  Binary& operator=(Binary&&) = default;
 
   bool owned() const { return !m_unownedData; }
   std::size_t size() const { return owned() ? m_data.size() : m_unownedSize; }
diff --git a/include/yaml-cpp/contrib/anchordict.h b/include/yaml-cpp/contrib/anchordict.h
index 78db9ec..4b12281 100644
--- a/include/yaml-cpp/contrib/anchordict.h
+++ b/include/yaml-cpp/contrib/anchordict.h
@@ -32,7 +32,7 @@ class AnchorDict {
   T Get(anchor_t anchor) const { return m_data[anchor - 1]; }
 
  private:
-  std::vector<T> m_data;
+  std::vector<T> m_data{};
 };
 }
 
diff --git a/include/yaml-cpp/node/detail/memory.h b/include/yaml-cpp/node/detail/memory.h
index 8f2bc26..13822ea 100644
--- a/include/yaml-cpp/node/detail/memory.h
+++ b/include/yaml-cpp/node/detail/memory.h
@@ -27,7 +27,7 @@ class YAML_CPP_API memory {
 
  private:
   typedef std::set<shared_node> Nodes;
-  Nodes m_nodes;
+  Nodes m_nodes{};
 };
 
 class YAML_CPP_API memory_holder {
diff --git a/include/yaml-cpp/node/detail/node.h b/include/yaml-cpp/node/detail/node.h
index 8a776f6..cb9f196 100644
--- a/include/yaml-cpp/node/detail/node.h
+++ b/include/yaml-cpp/node/detail/node.h
@@ -18,7 +18,7 @@ namespace YAML {
 namespace detail {
 class node {
  public:
-  node() : m_pRef(new node_ref) {}
+  node() : m_pRef(new node_ref), m_dependencies{} {}
   node(const node&) = delete;
   node& operator=(const node&) = delete;
 
diff --git a/include/yaml-cpp/node/impl.h b/include/yaml-cpp/node/impl.h
index de2bf44..444011e 100644
--- a/include/yaml-cpp/node/impl.h
+++ b/include/yaml-cpp/node/impl.h
@@ -15,7 +15,7 @@
 #include <string>
 
 namespace YAML {
-inline Node::Node() : m_isValid(true), m_pNode(NULL) {}
+inline Node::Node() : m_isValid(true), m_pMemory(nullptr), m_pNode(NULL) {}
 
 inline Node::Node(NodeType::value type)
     : m_isValid(true),
@@ -42,7 +42,7 @@ inline Node::Node(const Node& rhs)
       m_pMemory(rhs.m_pMemory),
       m_pNode(rhs.m_pNode) {}
 
-inline Node::Node(Zombie) : m_isValid(false), m_pNode(NULL) {}
+inline Node::Node(Zombie) : m_isValid(false), m_pMemory{}, m_pNode(NULL) {}
 
 inline Node::Node(detail::node& node, detail::shared_memory_holder pMemory)
     : m_isValid(true), m_pMemory(pMemory), m_pNode(&node) {}
@@ -202,6 +202,15 @@ inline Node& Node::operator=(const T& rhs) {
   return *this;
 }
 
+inline Node& Node::operator=(const Node& rhs) {
+  if (!m_isValid || !rhs.m_isValid)
+    throw InvalidNode();
+  if (is(rhs))
+    return *this;
+  AssignNode(rhs);
+  return *this;
+}
+
 inline void Node::reset(const YAML::Node& rhs) {
   if (!m_isValid || !rhs.m_isValid)
     throw InvalidNode();
@@ -238,15 +247,6 @@ inline void Node::Assign(char* rhs) {
   m_pNode->set_scalar(rhs);
 }
 
-inline Node& Node::operator=(const Node& rhs) {
-  if (!m_isValid || !rhs.m_isValid)
-    throw InvalidNode();
-  if (is(rhs))
-    return *this;
-  AssignNode(rhs);
-  return *this;
-}
-
 inline void Node::AssignData(const Node& rhs) {
   if (!m_isValid || !rhs.m_isValid)
     throw InvalidNode();
diff --git a/include/yaml-cpp/noncopyable.h b/include/yaml-cpp/noncopyable.h
index a261040..35f3543 100644
--- a/include/yaml-cpp/noncopyable.h
+++ b/include/yaml-cpp/noncopyable.h
@@ -13,12 +13,10 @@ namespace YAML {
 // this is basically boost::noncopyable
 class YAML_CPP_API noncopyable {
  protected:
-  noncopyable() {}
-  ~noncopyable() {}
-
- private:
-  noncopyable(const noncopyable&);
-  const noncopyable& operator=(const noncopyable&);
+  noncopyable() = default;
+  ~noncopyable() = default;
+  noncopyable(const noncopyable&) = delete;
+  noncopyable& operator=(const noncopyable&) = delete;
 };
 }
 
diff --git a/include/yaml-cpp/ostream_wrapper.h b/include/yaml-cpp/ostream_wrapper.h
index 09d45f3..c3b1381 100644
--- a/include/yaml-cpp/ostream_wrapper.h
+++ b/include/yaml-cpp/ostream_wrapper.h
@@ -17,6 +17,10 @@ class YAML_CPP_API ostream_wrapper {
  public:
   ostream_wrapper();
   explicit ostream_wrapper(std::ostream& stream);
+  ostream_wrapper(const ostream_wrapper&) = delete;
+  ostream_wrapper(ostream_wrapper&&) = delete;
+  ostream_wrapper& operator=(const ostream_wrapper&) = delete;
+  ostream_wrapper& operator=(ostream_wrapper&&) = delete;
   ~ostream_wrapper();
 
   void write(const std::string& str);
diff --git a/src/collectionstack.h b/src/collectionstack.h
index ebdc587..bfbe181 100644
--- a/src/collectionstack.h
+++ b/src/collectionstack.h
@@ -33,7 +33,7 @@ class CollectionStack {
   }
 
  private:
-  std::stack<CollectionType::value> collectionStack;
+  std::stack<CollectionType::value> collectionStack{};
 };
 }
 
diff --git a/src/contrib/graphbuilderadapter.h b/src/contrib/graphbuilderadapter.h
index 62b40a1..7d5f441 100644
--- a/src/contrib/graphbuilderadapter.h
+++ b/src/contrib/graphbuilderadapter.h
@@ -26,7 +26,11 @@ namespace YAML {
 class GraphBuilderAdapter : public EventHandler {
  public:
   GraphBuilderAdapter(GraphBuilderInterface& builder)
-      : m_builder(builder), m_pRootNode(nullptr), m_pKeyNode(nullptr) {}
+      : m_builder(builder), m_containers{}, m_anchors{}, m_pRootNode(nullptr), m_pKeyNode(nullptr) {}
+  GraphBuilderAdapter(const GraphBuilderAdapter&) = delete;
+  GraphBuilderAdapter(GraphBuilderAdapter&&) = delete;
+  GraphBuilderAdapter& operator=(const GraphBuilderAdapter&) = delete;
+  GraphBuilderAdapter& operator=(GraphBuilderAdapter&&) = delete;
 
   virtual void OnDocumentStart(const Mark& mark) { (void)mark; }
   virtual void OnDocumentEnd() {}
@@ -50,8 +54,8 @@ class GraphBuilderAdapter : public EventHandler {
   struct ContainerFrame {
     ContainerFrame(void* pSequence)
         : pContainer(pSequence), pPrevKeyNode(&sequenceMarker) {}
-    ContainerFrame(void* pMap, void* pPrevKeyNode)
-        : pContainer(pMap), pPrevKeyNode(pPrevKeyNode) {}
+    ContainerFrame(void* pMap, void* PrevKeyNode)
+        : pContainer(pMap), pPrevKeyNode(PrevKeyNode) {}
 
     void* pContainer;
     void* pPrevKeyNode;
diff --git a/src/directives.cpp b/src/directives.cpp
index 963bd2c..c936f73 100644
--- a/src/directives.cpp
+++ b/src/directives.cpp
@@ -1,11 +1,11 @@
 #include "directives.h"
 
 namespace YAML {
-Directives::Directives() {
-  // version
-  version.isDefault = true;
-  version.major = 1;
-  version.minor = 2;
+Directives::Directives() : version{true, 1, 2}, tags{} {
+  /* Version:
+  **  bool isDefault;
+  **  int major, minor;
+  */
 }
 
 const std::string Directives::TranslateTagHandle(
diff --git a/src/emitfromevents.cpp b/src/emitfromevents.cpp
index 4832649..27d3eb9 100644
--- a/src/emitfromevents.cpp
+++ b/src/emitfromevents.cpp
@@ -19,7 +19,7 @@ std::string ToString(YAML::anchor_t anchor) {
 }
 
 namespace YAML {
-EmitFromEvents::EmitFromEvents(Emitter& emitter) : m_emitter(emitter) {}
+EmitFromEvents::EmitFromEvents(Emitter& emitter) : m_emitter(emitter), m_stateStack{} {}
 
 void EmitFromEvents::OnDocumentStart(const Mark&) {}
 
diff --git a/src/emitter.cpp b/src/emitter.cpp
index 6872252..026f711 100644
--- a/src/emitter.cpp
+++ b/src/emitter.cpp
@@ -11,7 +11,7 @@ namespace YAML {
 class Binary;
 struct _Null;
 
-Emitter::Emitter() : m_pState(new EmitterState) {}
+Emitter::Emitter() : m_pState(new EmitterState), m_stream{} {}
 
 Emitter::Emitter(std::ostream& stream)
     : m_pState(new EmitterState), m_stream(stream) {}
diff --git a/src/emitterstate.cpp b/src/emitterstate.cpp
index d5f39e7..5d418fe 100644
--- a/src/emitterstate.cpp
+++ b/src/emitterstate.cpp
@@ -6,27 +6,32 @@
 namespace YAML {
 EmitterState::EmitterState()
     : m_isGood(true),
+      m_lastError{},
+      // default global manipulators
+      m_charset(EmitNonAscii),
+      m_strFmt(Auto),
+      m_boolFmt(TrueFalseBool),
+      m_boolLengthFmt(LongBool),
+      m_boolCaseFmt(LowerCase),
+      m_intFmt(Dec),
+      m_indent(2),
+      m_preCommentIndent(2),
+      m_postCommentIndent(1),
+      m_seqFmt(Block),
+      m_mapFmt(Block),
+      m_mapKeyFmt(Auto),
+      m_floatPrecision(std::numeric_limits<float>::max_digits10),
+      m_doublePrecision(std::numeric_limits<double>::max_digits10),
+      //
+      m_modifiedSettings{},
+      m_globalModifiedSettings{},
+      m_groups{},
       m_curIndent(0),
       m_hasAnchor(false),
       m_hasTag(false),
       m_hasNonContent(false),
-      m_docCount(0) {
-  // set default global manipulators
-  m_charset.set(EmitNonAscii);
-  m_strFmt.set(Auto);
-  m_boolFmt.set(TrueFalseBool);
-  m_boolLengthFmt.set(LongBool);
-  m_boolCaseFmt.set(LowerCase);
-  m_intFmt.set(Dec);
-  m_indent.set(2);
-  m_preCommentIndent.set(2);
-  m_postCommentIndent.set(1);
-  m_seqFmt.set(Block);
-  m_mapFmt.set(Block);
-  m_mapKeyFmt.set(Auto);
-  m_floatPrecision.set(std::numeric_limits<float>::max_digits10);
-  m_doublePrecision.set(std::numeric_limits<double>::max_digits10);
-}
+      m_docCount(0)
+{}
 
 EmitterState::~EmitterState() {}
 
diff --git a/src/emitterstate.h b/src/emitterstate.h
index 0937f00..11ac223 100644
--- a/src/emitterstate.h
+++ b/src/emitterstate.h
@@ -145,7 +145,7 @@ class EmitterState {
 
   struct Group {
     explicit Group(GroupType::value type_)
-        : type(type_), indent(0), childCount(0), longKey(false) {}
+        : type(type_), flowType{}, indent(0), childCount(0), longKey(false), modifiedSettings{} {}
 
     GroupType::value type;
     FlowType::value flowType;
diff --git a/src/emitterutils.cpp b/src/emitterutils.cpp
index e02931f..e4b87dd 100644
--- a/src/emitterutils.cpp
+++ b/src/emitterutils.cpp
@@ -173,12 +173,12 @@ bool IsValidPlainScalar(const std::string& str, FlowType::value flowType,
 
   // then check until something is disallowed
   static const RegEx& disallowed_flow =
-      Exp::EndScalarInFlow() || (Exp::BlankOrBreak() + Exp::Comment()) ||
-      Exp::NotPrintable() || Exp::Utf8_ByteOrderMark() || Exp::Break() ||
+      Exp::EndScalarInFlow() | (Exp::BlankOrBreak() + Exp::Comment()) |
+      Exp::NotPrintable() | Exp::Utf8_ByteOrderMark() | Exp::Break() |
       Exp::Tab();
   static const RegEx& disallowed_block =
-      Exp::EndScalar() || (Exp::BlankOrBreak() + Exp::Comment()) ||
-      Exp::NotPrintable() || Exp::Utf8_ByteOrderMark() || Exp::Break() ||
+      Exp::EndScalar() | (Exp::BlankOrBreak() + Exp::Comment()) |
+      Exp::NotPrintable() | Exp::Utf8_ByteOrderMark() | Exp::Break() |
       Exp::Tab();
   const RegEx& disallowed =
       flowType == FlowType::Flow ? disallowed_flow : disallowed_block;
diff --git a/src/exp.h b/src/exp.h
index 7c02cf6..fe36535 100644
--- a/src/exp.h
+++ b/src/exp.h
@@ -33,15 +33,15 @@ inline const RegEx& Tab() {
   return e;
 }
 inline const RegEx& Blank() {
-  static const RegEx e = Space() || Tab();
+  static const RegEx e = Space() | Tab();
   return e;
 }
 inline const RegEx& Break() {
-  static const RegEx e = RegEx('\n') || RegEx("\r\n");
+  static const RegEx e = RegEx('\n') | RegEx("\r\n");
   return e;
 }
 inline const RegEx& BlankOrBreak() {
-  static const RegEx e = Blank() || Break();
+  static const RegEx e = Blank() | Break();
   return e;
 }
 inline const RegEx& Digit() {
@@ -49,29 +49,29 @@ inline const RegEx& Digit() {
   return e;
 }
 inline const RegEx& Alpha() {
-  static const RegEx e = RegEx('a', 'z') || RegEx('A', 'Z');
+  static const RegEx e = RegEx('a', 'z') | RegEx('A', 'Z');
   return e;
 }
 inline const RegEx& AlphaNumeric() {
-  static const RegEx e = Alpha() || Digit();
+  static const RegEx e = Alpha() | Digit();
   return e;
 }
 inline const RegEx& Word() {
-  static const RegEx e = AlphaNumeric() || RegEx('-');
+  static const RegEx e = AlphaNumeric() | RegEx('-');
   return e;
 }
 inline const RegEx& Hex() {
-  static const RegEx e = Digit() || RegEx('A', 'F') || RegEx('a', 'f');
+  static const RegEx e = Digit() | RegEx('A', 'F') | RegEx('a', 'f');
   return e;
 }
 // Valid Unicode code points that are not part of c-printable (YAML 1.2, sec.
 // 5.1)
 inline const RegEx& NotPrintable() {
   static const RegEx e =
-      RegEx(0) ||
-      RegEx("\x01\x02\x03\x04\x05\x06\x07\x08\x0B\x0C\x7F", REGEX_OR) ||
-      RegEx(0x0E, 0x1F) ||
-      (RegEx('\xC2') + (RegEx('\x80', '\x84') || RegEx('\x86', '\x9F')));
+      RegEx(0) |
+      RegEx("\x01\x02\x03\x04\x05\x06\x07\x08\x0B\x0C\x7F", REGEX_OR) |
+      RegEx(0x0E, 0x1F) |
+      (RegEx('\xC2') + (RegEx('\x80', '\x84') | RegEx('\x86', '\x9F')));
   return e;
 }
 inline const RegEx& Utf8_ByteOrderMark() {
@@ -82,19 +82,19 @@ inline const RegEx& Utf8_ByteOrderMark() {
 // actual tags
 
 inline const RegEx& DocStart() {
-  static const RegEx e = RegEx("---") + (BlankOrBreak() || RegEx());
+  static const RegEx e = RegEx("---") + (BlankOrBreak() | RegEx());
   return e;
 }
 inline const RegEx& DocEnd() {
-  static const RegEx e = RegEx("...") + (BlankOrBreak() || RegEx());
+  static const RegEx e = RegEx("...") + (BlankOrBreak() | RegEx());
   return e;
 }
 inline const RegEx& DocIndicator() {
-  static const RegEx e = DocStart() || DocEnd();
+  static const RegEx e = DocStart() | DocEnd();
   return e;
 }
 inline const RegEx& BlockEntry() {
-  static const RegEx e = RegEx('-') + (BlankOrBreak() || RegEx());
+  static const RegEx e = RegEx('-') + (BlankOrBreak() | RegEx());
   return e;
 }
 inline const RegEx& Key() {
@@ -106,11 +106,11 @@ inline const RegEx& KeyInFlow() {
   return e;
 }
 inline const RegEx& Value() {
-  static const RegEx e = RegEx(':') + (BlankOrBreak() || RegEx());
+  static const RegEx e = RegEx(':') + (BlankOrBreak() | RegEx());
   return e;
 }
 inline const RegEx& ValueInFlow() {
-  static const RegEx e = RegEx(':') + (BlankOrBreak() || RegEx(",}", REGEX_OR));
+  static const RegEx e = RegEx(':') + (BlankOrBreak() | RegEx(",}", REGEX_OR));
   return e;
 }
 inline const RegEx& ValueInJSONFlow() {
@@ -122,20 +122,20 @@ inline const RegEx Comment() {
   return e;
 }
 inline const RegEx& Anchor() {
-  static const RegEx e = !(RegEx("[]{},", REGEX_OR) || BlankOrBreak());
+  static const RegEx e = !(RegEx("[]{},", REGEX_OR) | BlankOrBreak());
   return e;
 }
 inline const RegEx& AnchorEnd() {
-  static const RegEx e = RegEx("?:,]}%@`", REGEX_OR) || BlankOrBreak();
+  static const RegEx e = RegEx("?:,]}%@`", REGEX_OR) | BlankOrBreak();
   return e;
 }
 inline const RegEx& URI() {
-  static const RegEx e = Word() || RegEx("#;/?:@&=+$,_.!~*'()[]", REGEX_OR) ||
+  static const RegEx e = Word() | RegEx("#;/?:@&=+$,_.!~*'()[]", REGEX_OR) |
                          (RegEx('%') + Hex() + Hex());
   return e;
 }
 inline const RegEx& Tag() {
-  static const RegEx e = Word() || RegEx("#;/?:@&=+$_.~*'()", REGEX_OR) ||
+  static const RegEx e = Word() | RegEx("#;/?:@&=+$_.~*'()", REGEX_OR) |
                          (RegEx('%') + Hex() + Hex());
   return e;
 }
@@ -148,34 +148,34 @@ inline const RegEx& Tag() {
 // space.
 inline const RegEx& PlainScalar() {
   static const RegEx e =
-      !(BlankOrBreak() || RegEx(",[]{}#&*!|>\'\"%@`", REGEX_OR) ||
-        (RegEx("-?:", REGEX_OR) + (BlankOrBreak() || RegEx())));
+      !(BlankOrBreak() | RegEx(",[]{}#&*!|>\'\"%@`", REGEX_OR) |
+        (RegEx("-?:", REGEX_OR) + (BlankOrBreak() | RegEx())));
   return e;
 }
 inline const RegEx& PlainScalarInFlow() {
   static const RegEx e =
-      !(BlankOrBreak() || RegEx("?,[]{}#&*!|>\'\"%@`", REGEX_OR) ||
+      !(BlankOrBreak() | RegEx("?,[]{}#&*!|>\'\"%@`", REGEX_OR) |
         (RegEx("-:", REGEX_OR) + Blank()));
   return e;
 }
 inline const RegEx& EndScalar() {
-  static const RegEx e = RegEx(':') + (BlankOrBreak() || RegEx());
+  static const RegEx e = RegEx(':') + (BlankOrBreak() | RegEx());
   return e;
 }
 inline const RegEx& EndScalarInFlow() {
   static const RegEx e =
-      (RegEx(':') + (BlankOrBreak() || RegEx() || RegEx(",]}", REGEX_OR))) ||
+      (RegEx(':') + (BlankOrBreak() | RegEx() | RegEx(",]}", REGEX_OR))) |
       RegEx(",?[]{}", REGEX_OR);
   return e;
 }
 
 inline const RegEx& ScanScalarEndInFlow() {
-  static const RegEx e = (EndScalarInFlow() || (BlankOrBreak() + Comment()));
+  static const RegEx e = (EndScalarInFlow() | (BlankOrBreak() + Comment()));
   return e;
 }
 
 inline const RegEx& ScanScalarEnd() {
-  static const RegEx e = EndScalar() || (BlankOrBreak() + Comment());
+  static const RegEx e = EndScalar() | (BlankOrBreak() + Comment());
   return e;
 }
 inline const RegEx& EscSingleQuote() {
@@ -192,8 +192,8 @@ inline const RegEx& ChompIndicator() {
   return e;
 }
 inline const RegEx& Chomp() {
-  static const RegEx e = (ChompIndicator() + Digit()) ||
-                         (Digit() + ChompIndicator()) || ChompIndicator() ||
+  static const RegEx e = (ChompIndicator() + Digit()) |
+                         (Digit() + ChompIndicator()) | ChompIndicator() |
                          Digit();
   return e;
 }
diff --git a/src/node_data.cpp b/src/node_data.cpp
index 04104b7..c54b0a6 100644
--- a/src/node_data.cpp
+++ b/src/node_data.cpp
@@ -22,8 +22,14 @@ node_data::node_data()
     : m_isDefined(false),
       m_mark(Mark::null_mark()),
       m_type(NodeType::Null),
+      m_tag{},
       m_style(EmitterStyle::Default),
-      m_seqSize(0) {}
+      m_scalar{},
+      m_sequence{},
+      m_seqSize(0),
+      m_map{},
+      m_undefinedPairs{}
+{}
 
 void node_data::mark_defined() {
   if (m_type == NodeType::Undefined)
@@ -238,8 +244,7 @@ bool node_data::remove(node& key, shared_memory_holder /* pMemory */) {
   if (m_type != NodeType::Map)
     return false;
 
-  kv_pairs::iterator it = m_undefinedPairs.begin();
-  while (it != m_undefinedPairs.end()) {
+  for(kv_pairs::iterator it = m_undefinedPairs.begin(); it != m_undefinedPairs.end();) {
     kv_pairs::iterator jt = std::next(it);
     if (it->first->is(key))
       m_undefinedPairs.erase(it);
diff --git a/src/nodebuilder.cpp b/src/nodebuilder.cpp
index e79ac50..ad9bf55 100644
--- a/src/nodebuilder.cpp
+++ b/src/nodebuilder.cpp
@@ -11,7 +11,13 @@ namespace YAML {
 struct Mark;
 
 NodeBuilder::NodeBuilder()
-    : m_pMemory(new detail::memory_holder), m_pRoot(nullptr), m_mapDepth(0) {
+    : m_pMemory(new detail::memory_holder),
+      m_pRoot(nullptr),
+      m_stack{},
+      m_anchors{},
+      m_keys{},
+      m_mapDepth(0)
+{
   m_anchors.push_back(nullptr);  // since the anchors start at 1
 }
 
diff --git a/src/nodebuilder.h b/src/nodebuilder.h
index a6a47f0..f89620a 100644
--- a/src/nodebuilder.h
+++ b/src/nodebuilder.h
@@ -27,6 +27,10 @@ class Node;
 class NodeBuilder : public EventHandler {
  public:
   NodeBuilder();
+  NodeBuilder(const NodeBuilder&) = delete;
+  NodeBuilder(NodeBuilder&&) = delete;
+  NodeBuilder& operator=(const NodeBuilder&) = delete;
+  NodeBuilder& operator=(NodeBuilder&&) = delete;
   virtual ~NodeBuilder();
 
   Node Root();
diff --git a/src/nodeevents.cpp b/src/nodeevents.cpp
index 82261fe..bfbe1b6 100644
--- a/src/nodeevents.cpp
+++ b/src/nodeevents.cpp
@@ -20,7 +20,7 @@ anchor_t NodeEvents::AliasManager::LookupAnchor(
 }
 
 NodeEvents::NodeEvents(const Node& node)
-    : m_pMemory(node.m_pMemory), m_root(node.m_pNode) {
+    : m_pMemory(node.m_pMemory), m_root(node.m_pNode), m_refCount{} {
   if (m_root)
     Setup(*m_root);
 }
diff --git a/src/nodeevents.h b/src/nodeevents.h
index 49c18eb..0690572 100644
--- a/src/nodeevents.h
+++ b/src/nodeevents.h
@@ -26,13 +26,17 @@ class Node;
 class NodeEvents {
  public:
   explicit NodeEvents(const Node& node);
+  NodeEvents(const NodeEvents&) = delete;
+  NodeEvents(NodeEvents&&) = delete;
+  NodeEvents& operator=(const NodeEvents&) = delete;
+  NodeEvents& operator=(NodeEvents&&) = delete;
 
   void Emit(EventHandler& handler);
 
  private:
   class AliasManager {
    public:
-    AliasManager() : m_curAnchor(0) {}
+    AliasManager() : m_anchorByIdentity{}, m_curAnchor(0) {}
 
     void RegisterReference(const detail::node& node);
     anchor_t LookupAnchor(const detail::node& node) const;
diff --git a/src/ostream_wrapper.cpp b/src/ostream_wrapper.cpp
index a3c7597..dd16373 100644
--- a/src/ostream_wrapper.cpp
+++ b/src/ostream_wrapper.cpp
@@ -14,7 +14,7 @@ ostream_wrapper::ostream_wrapper()
       m_comment(false) {}
 
 ostream_wrapper::ostream_wrapper(std::ostream& stream)
-    : m_pStream(&stream), m_pos(0), m_row(0), m_col(0), m_comment(false) {}
+    : m_buffer{}, m_pStream(&stream), m_pos(0), m_row(0), m_col(0), m_comment(false) {}
 
 ostream_wrapper::~ostream_wrapper() {}
 
diff --git a/src/parser.cpp b/src/parser.cpp
index cd69f39..b7a4fd5 100644
--- a/src/parser.cpp
+++ b/src/parser.cpp
@@ -11,9 +11,9 @@
 namespace YAML {
 class EventHandler;
 
-Parser::Parser() {}
+Parser::Parser() : m_pScanner{}, m_pDirectives{} {}
 
-Parser::Parser(std::istream& in) { Load(in); }
+Parser::Parser(std::istream& in) : Parser() { Load(in); }
 
 Parser::~Parser() {}
 
diff --git a/src/ptr_vector.h b/src/ptr_vector.h
index 955aebd..8a354ba 100644
--- a/src/ptr_vector.h
+++ b/src/ptr_vector.h
@@ -20,7 +20,7 @@ namespace YAML {
 template <typename T>
 class ptr_vector : private YAML::noncopyable {
  public:
-  ptr_vector() {}
+  ptr_vector() : m_data{} {}
 
   void clear() { m_data.clear(); }
 
diff --git a/src/regex_yaml.cpp b/src/regex_yaml.cpp
index 20b7720..e40f9c0 100644
--- a/src/regex_yaml.cpp
+++ b/src/regex_yaml.cpp
@@ -2,17 +2,19 @@
 
 namespace YAML {
 // constructors
-RegEx::RegEx() : m_op(REGEX_EMPTY) {}
 
-RegEx::RegEx(REGEX_OP op) : m_op(op) {}
+RegEx::RegEx(REGEX_OP op) : m_op(op), m_a(0), m_z(0), m_params{} {}
+RegEx::RegEx() : RegEx(REGEX_EMPTY) {}
 
-RegEx::RegEx(char ch) : m_op(REGEX_MATCH), m_a(ch) {}
+RegEx::RegEx(char ch) : m_op(REGEX_MATCH), m_a(ch), m_z(0), m_params{} {}
 
-RegEx::RegEx(char a, char z) : m_op(REGEX_RANGE), m_a(a), m_z(z) {}
+RegEx::RegEx(char a, char z) : m_op(REGEX_RANGE), m_a(a), m_z(z), m_params{} {}
 
-RegEx::RegEx(const std::string& str, REGEX_OP op) : m_op(op) {
+RegEx::RegEx(const std::string& str, REGEX_OP op) : m_op(op), m_a(0), m_z(0), m_params(str.begin(), str.end()) {
+/*
   for (std::size_t i = 0; i < str.size(); i++)
     m_params.push_back(RegEx(str[i]));
+*/
 }
 
 // combination constructors
@@ -22,14 +24,14 @@ RegEx operator!(const RegEx& ex) {
   return ret;
 }
 
-RegEx operator||(const RegEx& ex1, const RegEx& ex2) {
+RegEx operator|(const RegEx& ex1, const RegEx& ex2) {
   RegEx ret(REGEX_OR);
   ret.m_params.push_back(ex1);
   ret.m_params.push_back(ex2);
   return ret;
 }
 
-RegEx operator&&(const RegEx& ex1, const RegEx& ex2) {
+RegEx operator&(const RegEx& ex1, const RegEx& ex2) {
   RegEx ret(REGEX_AND);
   ret.m_params.push_back(ex1);
   ret.m_params.push_back(ex2);
diff --git a/src/regex_yaml.h b/src/regex_yaml.h
index 1611cb2..9428836 100644
--- a/src/regex_yaml.h
+++ b/src/regex_yaml.h
@@ -37,8 +37,8 @@ class YAML_CPP_API RegEx {
   ~RegEx() {}
 
   friend YAML_CPP_API RegEx operator!(const RegEx& ex);
-  friend YAML_CPP_API RegEx operator||(const RegEx& ex1, const RegEx& ex2);
-  friend YAML_CPP_API RegEx operator&&(const RegEx& ex1, const RegEx& ex2);
+  friend YAML_CPP_API RegEx operator|(const RegEx& ex1, const RegEx& ex2);
+  friend YAML_CPP_API RegEx operator&(const RegEx& ex1, const RegEx& ex2);
   friend YAML_CPP_API RegEx operator+(const RegEx& ex1, const RegEx& ex2);
 
   bool Matches(char ch) const;
diff --git a/src/scanner.cpp b/src/scanner.cpp
index 546a2f0..61beaac 100644
--- a/src/scanner.cpp
+++ b/src/scanner.cpp
@@ -9,10 +9,16 @@
 namespace YAML {
 Scanner::Scanner(std::istream& in)
     : INPUT(in),
+      m_tokens{},
       m_startedStream(false),
       m_endedStream(false),
       m_simpleKeyAllowed(false),
-      m_canBeJSONFlow(false) {}
+      m_canBeJSONFlow(false),
+      m_simpleKeys{},
+      m_indents{},
+      m_indentRefs{},
+      m_flows{}
+{}
 
 Scanner::~Scanner() {}
 
diff --git a/src/scantoken.cpp b/src/scantoken.cpp
index fd8758d..27e5e3e 100644
--- a/src/scantoken.cpp
+++ b/src/scantoken.cpp
@@ -338,7 +338,7 @@ void Scanner::ScanQuotedScalar() {
 
   // setup the scanning parameters
   ScanScalarParams params;
-  RegEx end = (single ? RegEx(quote) && !Exp::EscSingleQuote() : RegEx(quote));
+  RegEx end = (single ? RegEx(quote) & !Exp::EscSingleQuote() : RegEx(quote));
   params.end = &end;
   params.eatEnd = true;
   params.escape = (single ? '\'' : '\\');
diff --git a/src/setting.h b/src/setting.h
index b78d40e..535088e 100644
--- a/src/setting.h
+++ b/src/setting.h
@@ -18,6 +18,9 @@ template <typename T>
 class Setting {
  public:
   Setting() : m_value() {}
+  Setting(const T& value) : m_value() {
+      set(value);
+  }
 
   const T get() const { return m_value; }
   std::unique_ptr<SettingChangeBase> set(const T& value);
@@ -34,12 +37,16 @@ class SettingChangeBase {
 };
 
 template <typename T>
-class SettingChange : public SettingChangeBase {
+class SettingChange : public SettingChangeBase, private noncopyable {
  public:
-  SettingChange(Setting<T>* pSetting) : m_pCurSetting(pSetting) {
-    // copy old setting to save its state
-    m_oldSetting = *pSetting;
-  }
+  SettingChange(Setting<T>* pSetting) :
+      m_pCurSetting(pSetting),
+      m_oldSetting(*pSetting) // copy old setting to save its state
+  {}
+  SettingChange(const SettingChange&) = delete;
+  SettingChange(SettingChange&&) = delete;
+  SettingChange& operator=(const SettingChange&) = delete;
+  SettingChange& operator=(SettingChange&&) = delete;
 
   virtual void pop() { m_pCurSetting->restore(m_oldSetting); }
 
@@ -57,7 +64,7 @@ inline std::unique_ptr<SettingChangeBase> Setting<T>::set(const T& value) {
 
 class SettingChanges : private noncopyable {
  public:
-  SettingChanges() {}
+  SettingChanges() : m_settingChanges{} {}
   ~SettingChanges() { clear(); }
 
   void clear() {
diff --git a/src/singledocparser.cpp b/src/singledocparser.cpp
index a27c1c3..b18e386 100644
--- a/src/singledocparser.cpp
+++ b/src/singledocparser.cpp
@@ -18,7 +18,9 @@ SingleDocParser::SingleDocParser(Scanner& scanner, const Directives& directives)
     : m_scanner(scanner),
       m_directives(directives),
       m_pCollectionStack(new CollectionStack),
-      m_curAnchor(0) {}
+      m_anchors{},
+      m_curAnchor(0)
+{}
 
 SingleDocParser::~SingleDocParser() {}
 
@@ -166,10 +168,10 @@ void SingleDocParser::HandleBlockSequence(EventHandler& eventHandler) {
 
     // check for null
     if (!m_scanner.empty()) {
-      const Token& token = m_scanner.peek();
-      if (token.type == Token::BLOCK_ENTRY ||
-          token.type == Token::BLOCK_SEQ_END) {
-        eventHandler.OnNull(token.mark, NullAnchor);
+      const Token& tnullcheck = m_scanner.peek();
+      if (tnullcheck.type == Token::BLOCK_ENTRY ||
+          tnullcheck.type == Token::BLOCK_SEQ_END) {
+        eventHandler.OnNull(tnullcheck.mark, NullAnchor);
         continue;
       }
     }
diff --git a/src/stream.cpp b/src/stream.cpp
index 3b013cf..88a3d6b 100644
--- a/src/stream.cpp
+++ b/src/stream.cpp
@@ -192,9 +192,13 @@ inline void QueueUnicodeCodepoint(std::deque<char>& q, unsigned long ch) {
 
 Stream::Stream(std::istream& input)
     : m_input(input),
+      m_mark{},
+      m_charSet{},
+      m_readahead{},
       m_pPrefetched(new unsigned char[YAML_PREFETCH_SIZE]),
       m_nPrefetchedAvailable(0),
-      m_nPrefetchedUsed(0) {
+      m_nPrefetchedUsed(0)
+{
   typedef std::istream::traits_type char_traits;
 
   if (!input)
diff --git a/src/stream.h b/src/stream.h
index 42d542d..c0198af 100644
--- a/src/stream.h
+++ b/src/stream.h
@@ -22,6 +22,10 @@ class Stream : private noncopyable {
   friend class StreamCharSource;
 
   Stream(std::istream& input);
+  Stream(const Stream&) = delete;
+  Stream(Stream&&) = delete;
+  Stream& operator=(const Stream&) = delete;
+  Stream& operator=(Stream&&) = delete;
   ~Stream();
 
   operator bool() const;
diff --git a/src/tag.cpp b/src/tag.cpp
index 5143552..b1acd9e 100644
--- a/src/tag.cpp
+++ b/src/tag.cpp
@@ -6,7 +6,7 @@
 #include "token.h"
 
 namespace YAML {
-Tag::Tag(const Token& token) : type(static_cast<TYPE>(token.data)) {
+Tag::Tag(const Token& token) : type(static_cast<TYPE>(token.data)), handle{}, value{} {
   switch (type) {
     case VERBATIM:
       value = token.value;
diff --git a/src/token.h b/src/token.h
index ad0b7d0..2d2790e 100644
--- a/src/token.h
+++ b/src/token.h
@@ -48,7 +48,7 @@ struct Token {
 
   // data
   Token(TYPE type_, const Mark& mark_)
-      : status(VALID), type(type_), mark(mark_), data(0) {}
+      : status(VALID), type(type_), mark(mark_), value{}, params{}, data(0) {}
 
   friend std::ostream& operator<<(std::ostream& out, const Token& token) {
     out << TokenNames[token.type] << std::string(": ") << token.value;
diff --git a/test/regex_test.cpp b/test/regex_test.cpp
index 7589d2e..51c1435 100644
--- a/test/regex_test.cpp
+++ b/test/regex_test.cpp
@@ -106,8 +106,8 @@ TEST(RegExTest, OperatorOr) {
     for (int j = i + 1; j < 128; ++j) {
       auto iStr = std::string(1, char(i));
       auto jStr = std::string(1, char(j));
-      RegEx ex1 = RegEx(iStr) || RegEx(jStr);
-      RegEx ex2 = RegEx(jStr) || RegEx(iStr);
+      RegEx ex1 = RegEx(iStr) | RegEx(jStr);
+      RegEx ex2 = RegEx(jStr) | RegEx(iStr);
 
       for (int k = MIN_CHAR; k < 128; ++k) {
         auto str = std::string(1, char(k));
@@ -128,8 +128,8 @@ TEST(RegExTest, OperatorOr) {
 }
 
 TEST(RegExTest, OperatorOrShortCircuits) {
-  RegEx ex1 = RegEx(std::string("aaaa")) || RegEx(std::string("aa"));
-  RegEx ex2 = RegEx(std::string("aa")) || RegEx(std::string("aaaa"));
+  RegEx ex1 = RegEx(std::string("aaaa")) | RegEx(std::string("aa"));
+  RegEx ex2 = RegEx(std::string("aa")) | RegEx(std::string("aaaa"));
 
   EXPECT_TRUE(ex1.Matches(std::string("aaaaa")));
   EXPECT_EQ(4, ex1.Match(std::string("aaaaa")));
@@ -139,13 +139,13 @@ TEST(RegExTest, OperatorOrShortCircuits) {
 }
 
 TEST(RegExTest, OperatorAnd) {
-  RegEx emptySet = RegEx('a') && RegEx();
+  RegEx emptySet = RegEx('a') & RegEx();
   EXPECT_FALSE(emptySet.Matches(std::string("a")));
 }
 
 TEST(RegExTest, OperatorAndShortCircuits) {
-  RegEx ex1 = RegEx(std::string("aaaa")) && RegEx(std::string("aa"));
-  RegEx ex2 = RegEx(std::string("aa")) && RegEx(std::string("aaaa"));
+  RegEx ex1 = RegEx(std::string("aaaa")) & RegEx(std::string("aa"));
+  RegEx ex2 = RegEx(std::string("aa")) & RegEx(std::string("aaaa"));
 
   EXPECT_TRUE(ex1.Matches(std::string("aaaaa")));
   EXPECT_EQ(4, ex1.Match(std::string("aaaaa")));