Replace Boost usage with C++11 features

- Adds 'std=c++11' compiler flags
 - Replaces boost::type_traits with std::type_traits
 - Replaces boost::shared_ptr with std::shared_ptr
 - Replaces std::auto_ptr with std::unique_ptr
 - Replaces raw pointers with std::unique_ptr in ptr_vector, ptr_stack, and SettingChanges
 - Replaces boost::noncopyable with deleted copy and assignment operators
 - Replaces boost::next with std::next
 - Replaces boost::enable_if with std::enable_if
 - Replaces boost::is_convertible with std::is_convertible
 - Replaces ptrdiff_t with std::ptrdiff_t
 - Replaces boost::iterator_facade and boost::iterator_adaptor with std::iterator, borrowing the 'proxy reference' technique from boost
 - Removes Boost dependency from CMakeLists
 - Formats changed files using clang-format

src/emitterstate.cpp

@@ -124,10 +124,14 @@ void EmitterState::StartedGroup(GroupType::value type) {
   const int lastGroupIndent = (m_groups.empty() ? 0 : m_groups.top().indent);
   m_curIndent += lastGroupIndent;
 
-  std::auto_ptr<Group> pGroup(new Group(type));
+  // TODO: Create move constructors for settings types to simplify transfer
+  std::unique_ptr<Group> pGroup(new Group(type));
 
   // transfer settings (which last until this group is done)
-  pGroup->modifiedSettings = m_modifiedSettings;
+  //
+  // NB: if pGroup->modifiedSettings == m_modifiedSettings,
+  // m_modifiedSettings is not changed!
+  pGroup->modifiedSettings = std::move(m_modifiedSettings);
 
   // set up group
   if (GetFlowType(type) == Block)
@@ -136,7 +140,7 @@ void EmitterState::StartedGroup(GroupType::value type) {
     pGroup->flowType = FlowType::Flow;
   pGroup->indent = GetIndent();
 
-  m_groups.push(pGroup);
+  m_groups.push(std::move(pGroup));
 }
 
 void EmitterState::EndedGroup(GroupType::value type) {
@@ -149,7 +153,7 @@ void EmitterState::EndedGroup(GroupType::value type) {
 
   // get rid of the current group
   {
-    std::auto_ptr<Group> pFinishedGroup = m_groups.pop();
+    std::unique_ptr<Group> pFinishedGroup = m_groups.pop();
     if (pFinishedGroup->type != type)
       return SetError(ErrorMsg::UNMATCHED_GROUP_TAG);
   }

src/node_data.cpp

@@ -1,5 +1,5 @@
 #include <assert.h>
-#include <boost/smart_ptr/shared_ptr.hpp>
+#include <iterator>
 #include <sstream>
 
 #include "yaml-cpp/exceptions.h"
@@ -28,9 +28,7 @@ void node_data::mark_defined() {
   m_isDefined = true;
 }
 
-void node_data::set_mark(const Mark& mark) {
-  m_mark = mark;
-}
+void node_data::set_mark(const Mark& mark) { m_mark = mark; }
 
 void node_data::set_type(NodeType::value type) {
   if (type == NodeType::Undefined) {
@@ -104,7 +102,7 @@ void node_data::compute_seq_size() const {
 void node_data::compute_map_size() const {
   kv_pairs::iterator it = m_undefinedPairs.begin();
   while (it != m_undefinedPairs.end()) {
-    kv_pairs::iterator jt = boost::next(it);
+    kv_pairs::iterator jt = std::next(it);
     if (it->first->is_defined() && it->second->is_defined())
       m_undefinedPairs.erase(it);
     it = jt;

src/ptr_stack.h

@@ -14,40 +14,45 @@
 
 #include "yaml-cpp/noncopyable.h"
 
+// TODO: This class is no longer needed
 template <typename T>
 class ptr_stack : private YAML::noncopyable {
  public:
   ptr_stack() {}
-  ~ptr_stack() { clear(); }
 
   void clear() {
-    for (std::size_t i = 0; i < m_data.size(); i++)
-      delete m_data[i];
     m_data.clear();
   }
 
   std::size_t size() const { return m_data.size(); }
   bool empty() const { return m_data.empty(); }
 
-  void push(std::auto_ptr<T> t) {
-    m_data.push_back(NULL);
-    m_data.back() = t.release();
+  void push(std::unique_ptr<T>&& t) {
+    m_data.push_back(std::move(t));
   }
-  std::auto_ptr<T> pop() {
-    std::auto_ptr<T> t(m_data.back());
+  std::unique_ptr<T> pop() {
+   std::unique_ptr<T> t(std::move(m_data.back()));
     m_data.pop_back();
     return t;
   }
-  T& top() { return *m_data.back(); }
-  const T& top() const { return *m_data.back(); }
 
-  T& top(std::ptrdiff_t diff) { return **(m_data.end() - 1 + diff); }
+  T& top() {
+    return *(m_data.back().get());
+  }
+  const T& top() const {
+    return *(m_data.back().get());
+  }
+
+  T& top(std::ptrdiff_t diff) {
+    return *((m_data.end() - 1 + diff)->get());
+  }
+
   const T& top(std::ptrdiff_t diff) const {
-    return **(m_data.end() - 1 + diff);
+    return *((m_data.end() - 1 + diff)->get());
   }
 
  private:
-  std::vector<T*> m_data;
+    std::vector<std::unique_ptr<T>> m_data;
 };
 
 #endif  // PTR_STACK_H_62B23520_7C8E_11DE_8A39_0800200C9A66

src/ptr_vector.h

@@ -16,33 +16,35 @@
 
 namespace YAML {
 
+// TODO: This class is no longer needed
 template <typename T>
 class ptr_vector : private YAML::noncopyable {
  public:
   ptr_vector() {}
-  ~ptr_vector() { clear(); }
 
   void clear() {
-    for (std::size_t i = 0; i < m_data.size(); i++)
-      delete m_data[i];
     m_data.clear();
   }
 
   std::size_t size() const { return m_data.size(); }
   bool empty() const { return m_data.empty(); }
 
-  void push_back(std::auto_ptr<T> t) {
-    m_data.push_back(NULL);
-    m_data.back() = t.release();
+  void push_back(std::unique_ptr<T>&& t) {
+    m_data.push_back(std::move(t));
   }
   T& operator[](std::size_t i) { return *m_data[i]; }
   const T& operator[](std::size_t i) const { return *m_data[i]; }
 
-  T& back() { return *m_data.back(); }
-  const T& back() const { return *m_data.back(); }
+  T& back() {
+      return *(m_data.back().get());
+  }
+
+  const T& back() const {
+      return *(m_data.back().get());
+  }
 
  private:
-  std::vector<T*> m_data;
+   std::vector<std::unique_ptr<T>> m_data;
 };
 }
 

src/scanner.cpp

@@ -233,8 +233,8 @@ const RegEx& Scanner::GetValueRegex() const {
 void Scanner::StartStream() {
   m_startedStream = true;
   m_simpleKeyAllowed = true;
-  std::auto_ptr<IndentMarker> pIndent(new IndentMarker(-1, IndentMarker::NONE));
-  m_indentRefs.push_back(pIndent);
+  std::unique_ptr<IndentMarker> pIndent(new IndentMarker(-1, IndentMarker::NONE));
+  m_indentRefs.push_back(std::move(pIndent));
   m_indents.push(&m_indentRefs.back());
 }
 
@@ -281,7 +281,7 @@ Scanner::IndentMarker* Scanner::PushIndentTo(int column,
   if (InFlowContext())
     return 0;
 
-  std::auto_ptr<IndentMarker> pIndent(new IndentMarker(column, type));
+  std::unique_ptr<IndentMarker> pIndent(new IndentMarker(column, type));
   IndentMarker& indent = *pIndent;
   const IndentMarker& lastIndent = *m_indents.top();
 
@@ -298,7 +298,7 @@ Scanner::IndentMarker* Scanner::PushIndentTo(int column,
 
   // and then the indent
   m_indents.push(&indent);
-  m_indentRefs.push_back(pIndent);
+  m_indentRefs.push_back(std::move(pIndent));
   return &m_indentRefs.back();
 }
 

src/setting.h

@@ -20,7 +20,7 @@ class Setting {
   Setting() : m_value() {}
 
   const T get() const { return m_value; }
-  std::auto_ptr<SettingChangeBase> set(const T& value);
+  std::unique_ptr<SettingChangeBase> set(const T& value);
   void restore(const Setting<T>& oldSetting) { m_value = oldSetting.get(); }
 
  private:
@@ -49,8 +49,8 @@ class SettingChange : public SettingChangeBase {
 };
 
 template <typename T>
-inline std::auto_ptr<SettingChangeBase> Setting<T>::set(const T& value) {
-  std::auto_ptr<SettingChangeBase> pChange(new SettingChange<T>(this));
+inline std::unique_ptr<SettingChangeBase> Setting<T>::set(const T& value) {
+  std::unique_ptr<SettingChangeBase> pChange(new SettingChange<T>(this));
   m_value = value;
   return pChange;
 }
@@ -62,10 +62,6 @@ class SettingChanges : private noncopyable {
 
   void clear() {
     restore();
-
-    for (setting_changes::const_iterator it = m_settingChanges.begin();
-         it != m_settingChanges.end(); ++it)
-      delete *it;
     m_settingChanges.clear();
   }
 
@@ -75,23 +71,23 @@ class SettingChanges : private noncopyable {
       (*it)->pop();
   }
 
-  void push(std::auto_ptr<SettingChangeBase> pSettingChange) {
-    m_settingChanges.push_back(pSettingChange.release());
+  void push(std::unique_ptr<SettingChangeBase> pSettingChange) {
+    m_settingChanges.push_back(std::move(pSettingChange));
   }
 
-  // like std::auto_ptr - assignment is transfer of ownership
-  SettingChanges& operator=(SettingChanges& rhs) {
+  // like std::unique_ptr - assignment is transfer of ownership
+  SettingChanges& operator=(SettingChanges&& rhs) {
     if (this == &rhs)
       return *this;
 
     clear();
-    m_settingChanges = rhs.m_settingChanges;
-    rhs.m_settingChanges.clear();
+    std::swap(m_settingChanges, rhs.m_settingChanges);
+
     return *this;
   }
 
  private:
-  typedef std::vector<SettingChangeBase*> setting_changes;
+  typedef std::vector<std::unique_ptr<SettingChangeBase>> setting_changes;
   setting_changes m_settingChanges;
 };
 }

src/singledocparser.h

@@ -53,7 +53,7 @@ class SingleDocParser : private noncopyable {
  private:
   Scanner& m_scanner;
   const Directives& m_directives;
-  std::auto_ptr<CollectionStack> m_pCollectionStack;
+  std::unique_ptr<CollectionStack> m_pCollectionStack;
 
   typedef std::map<std::string, anchor_t> Anchors;
   Anchors m_anchors;