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

CMakeLists.txt

@@ -113,8 +113,6 @@ endif()
 include_directories(${YAML_CPP_SOURCE_DIR}/src)
 include_directories(${YAML_CPP_SOURCE_DIR}/include)
 
-find_package(Boost REQUIRED)
-include_directories(${Boost_INCLUDE_DIRS})
 
 
 ###
@@ -181,7 +179,7 @@ if("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU" OR
 		set(GCC_EXTRA_OPTIONS "${GCC_EXTRA_OPTIONS} ${FLAG_TESTED}")
 	endif()
 	#
-	set(yaml_cxx_flags "-Wall ${GCC_EXTRA_OPTIONS} -pedantic -Wno-long-long ${yaml_cxx_flags}")
+	set(yaml_cxx_flags "-Wall ${GCC_EXTRA_OPTIONS} -pedantic -Wno-long-long -std=c++11 ${yaml_cxx_flags}")
 
 	### Make specific
 	if(${CMAKE_BUILD_TOOL} MATCHES make OR ${CMAKE_BUILD_TOOL} MATCHES gmake)

include/yaml-cpp/emitter.h

@@ -122,7 +122,7 @@ class YAML_CPP_API Emitter : private noncopyable {
   bool CanEmitNewline() const;
 
  private:
-  std::auto_ptr<EmitterState> m_pState;
+  std::unique_ptr<EmitterState> m_pState;
   ostream_wrapper m_stream;
 };
 

include/yaml-cpp/node/detail/impl.h

@@ -9,7 +9,7 @@
 
 #include "yaml-cpp/node/detail/node.h"
 #include "yaml-cpp/node/detail/node_data.h"
-#include <boost/type_traits.hpp>
+#include <type_traits>
 
 namespace YAML {
 namespace detail {
@@ -22,9 +22,9 @@ struct get_idx {
 };
 
 template <typename Key>
-struct get_idx<
-    Key, typename boost::enable_if_c<boost::is_unsigned<Key>::value &&
-                                     !boost::is_same<Key, bool>::value>::type> {
+struct get_idx<Key,
+               typename std::enable_if<std::is_unsigned<Key>::value &&
+                                       !std::is_same<Key, bool>::value>::type> {
   static node* get(const std::vector<node*>& sequence, const Key& key,
                    shared_memory_holder /* pMemory */) {
     return key < sequence.size() ? sequence[key] : 0;
@@ -41,7 +41,7 @@ struct get_idx<
 };
 
 template <typename Key>
-struct get_idx<Key, typename boost::enable_if<boost::is_signed<Key> >::type> {
+struct get_idx<Key, typename std::enable_if<std::is_signed<Key>::value>::type> {
   static node* get(const std::vector<node*>& sequence, const Key& key,
                    shared_memory_holder pMemory) {
     return key >= 0 ? get_idx<std::size_t>::get(

include/yaml-cpp/node/detail/iterator.h

@@ -10,45 +10,68 @@
 #include "yaml-cpp/dll.h"
 #include "yaml-cpp/node/ptr.h"
 #include "yaml-cpp/node/detail/node_iterator.h"
-#include <boost/iterator/iterator_adaptor.hpp>
-#include <boost/utility.hpp>
+#include <cstddef>
+#include <iterator>
 
 namespace YAML {
 namespace detail {
 struct iterator_value;
 
 template <typename V>
-class iterator_base
-    : public boost::iterator_adaptor<iterator_base<V>, node_iterator, V,
-                                     std::forward_iterator_tag, V> {
+class iterator_base : public std::iterator<std::forward_iterator_tag, V,
+                                           std::ptrdiff_t, V*, V> {
+
  private:
   template <typename>
   friend class iterator_base;
   struct enabler {};
-  typedef typename iterator_base::base_type base_type;
+  typedef node_iterator base_type;
+
+  struct proxy {
+    explicit proxy(const V& x) : m_ref(x) {}
+    V* operator->() { return std::addressof(m_ref); }
+    operator V*() { return std::addressof(m_ref); }
+
+    V m_ref;
+  };
 
  public:
   typedef typename iterator_base::value_type value_type;
 
  public:
-  iterator_base() {}
+  iterator_base() : m_iterator(), m_pMemory() {}
   explicit iterator_base(base_type rhs, shared_memory_holder pMemory)
-      : iterator_base::iterator_adaptor_(rhs), m_pMemory(pMemory) {}
+      : m_iterator(rhs), m_pMemory(pMemory) {}
 
   template <class W>
   iterator_base(const iterator_base<W>& rhs,
-                typename boost::enable_if<boost::is_convertible<W*, V*>,
-                                          enabler>::type = enabler())
-      : iterator_base::iterator_adaptor_(rhs.base()),
-        m_pMemory(rhs.m_pMemory) {}
+                typename std::enable_if<std::is_convertible<W*, V*>::value,
+                                        enabler>::type = enabler())
+      : m_iterator(rhs.m_iterator), m_pMemory(rhs.m_pMemory) {}
 
- private:
-  friend class boost::iterator_core_access;
+  iterator_base<V>& operator++() {
+    ++m_iterator;
+    return *this;
+  }
 
-  void increment() { this->base_reference() = boost::next(this->base()); }
+  iterator_base<V> operator++(int) {
+    iterator_base<V> iterator_pre(*this);
+    ++(*this);
+    return iterator_pre;
+  }
 
-  value_type dereference() const {
-    const typename base_type::value_type& v = *this->base();
+  template <typename W>
+  bool operator==(const iterator_base<W>& rhs) {
+    return m_iterator == rhs.m_iterator;
+  }
+
+  template <typename W>
+  bool operator!=(const iterator_base<W>& rhs) {
+    return m_iterator != rhs.m_iterator;
+  }
+
+  value_type operator*() const {
+    const typename base_type::value_type& v = *m_iterator;
     if (v.pNode)
       return value_type(Node(*v, m_pMemory));
     if (v.first && v.second)
@@ -56,7 +79,10 @@ class iterator_base
     return value_type();
   }
 
+  proxy operator->() const { return proxy(**this); }
+
  private:
+  base_type m_iterator;
   shared_memory_holder m_pMemory;
 };
 }

include/yaml-cpp/node/detail/node.h

@@ -13,13 +13,14 @@
 #include "yaml-cpp/node/ptr.h"
 #include "yaml-cpp/node/detail/node_ref.h"
 #include <set>
-#include <boost/utility.hpp>
 
 namespace YAML {
 namespace detail {
-class node : private boost::noncopyable {
+class node {
  public:
   node() : m_pRef(new node_ref) {}
+  node(const node&) = delete;
+  node& operator=(const node&) = delete;
 
   bool is(const node& rhs) const { return m_pRef == rhs.m_pRef; }
   const node_ref* ref() const { return m_pRef.get(); }
@@ -65,9 +66,7 @@ class node : private boost::noncopyable {
     m_pRef->set_data(*rhs.m_pRef);
   }
 
-  void set_mark(const Mark& mark) {
-    m_pRef->set_mark(mark);
-  }
+  void set_mark(const Mark& mark) { m_pRef->set_mark(mark); }
 
   void set_type(NodeType::value type) {
     if (type != NodeType::Undefined)

include/yaml-cpp/node/detail/node_data.h

@@ -7,8 +7,6 @@
 #pragma once
 #endif
 
-#include <boost/noncopyable.hpp>
-#include <boost/utility.hpp>
 #include <list>
 #include <map>
 #include <string>
@@ -29,9 +27,11 @@ class node;
 
 namespace YAML {
 namespace detail {
-class YAML_CPP_API node_data : private boost::noncopyable {
+class YAML_CPP_API node_data {
  public:
   node_data();
+  node_data(const node_data&) = delete;
+  node_data& operator=(const node_data&) = delete;
 
   void mark_defined();
   void set_mark(const Mark& mark);

include/yaml-cpp/node/detail/node_iterator.h

@@ -9,8 +9,9 @@
 
 #include "yaml-cpp/dll.h"
 #include "yaml-cpp/node/ptr.h"
-#include <boost/iterator/iterator_facade.hpp>
-#include <boost/utility/enable_if.hpp>
+#include <cstddef>
+#include <iterator>
+#include <memory>
 #include <map>
 #include <utility>
 #include <vector>
@@ -52,12 +53,20 @@ struct node_iterator_type<const V> {
 
 template <typename V>
 class node_iterator_base
-    : public boost::iterator_facade<
-          node_iterator_base<V>, node_iterator_value<V>,
-          std::forward_iterator_tag, node_iterator_value<V> > {
+    : public std::iterator<std::forward_iterator_tag, node_iterator_value<V>,
+                           std::ptrdiff_t, node_iterator_value<V>*,
+                           node_iterator_value<V> > {
  private:
   struct enabler {};
 
+  struct proxy {
+    explicit proxy(const node_iterator_value<V>& x) : m_ref(x) {}
+    node_iterator_value<V>* operator->() { return std::addressof(m_ref); }
+    operator node_iterator_value<V>*() { return std::addressof(m_ref); }
+
+    node_iterator_value<V> m_ref;
+  };
+
  public:
   typedef typename node_iterator_type<V>::seq SeqIter;
   typedef typename node_iterator_type<V>::map MapIter;
@@ -80,20 +89,18 @@ class node_iterator_base
 
   template <typename W>
   node_iterator_base(const node_iterator_base<W>& rhs,
-                     typename boost::enable_if<boost::is_convertible<W*, V*>,
-                                               enabler>::type = enabler())
+                     typename std::enable_if<std::is_convertible<W*, V*>::value,
+                                             enabler>::type = enabler())
       : m_type(rhs.m_type),
         m_seqIt(rhs.m_seqIt),
         m_mapIt(rhs.m_mapIt),
         m_mapEnd(rhs.m_mapEnd) {}
 
- private:
-  friend class boost::iterator_core_access;
   template <typename>
   friend class node_iterator_base;
 
   template <typename W>
-  bool equal(const node_iterator_base<W>& rhs) const {
+  bool operator==(const node_iterator_base<W>& rhs) const {
     if (m_type != rhs.m_type)
       return false;
 
@@ -108,7 +115,12 @@ class node_iterator_base
     return true;
   }
 
-  void increment() {
+  template <typename W>
+  bool operator!=(const node_iterator_base<W>& rhs) const {
+    return !(*this == rhs);
+  }
+
+  node_iterator_base<V>& operator++() {
     switch (m_type) {
       case iterator_type::None:
         break;
@@ -120,9 +132,16 @@ class node_iterator_base
         m_mapIt = increment_until_defined(m_mapIt);
         break;
     }
+    return *this;
   }
 
-  value_type dereference() const {
+  node_iterator_base<V> operator++(int) {
+    node_iterator_base<V> iterator_pre(*this);
+    ++(*this);
+    return iterator_pre;
+  }
+
+  value_type operator*() const {
     switch (m_type) {
       case iterator_type::None:
         return value_type();
@@ -134,6 +153,8 @@ class node_iterator_base
     return value_type();
   }
 
+  proxy operator->() const { return proxy(**this); }
+
   MapIter increment_until_defined(MapIter it) {
     while (it != m_mapEnd && !is_defined(it))
       ++it;

include/yaml-cpp/node/detail/node_ref.h

@@ -11,13 +11,14 @@
 #include "yaml-cpp/node/type.h"
 #include "yaml-cpp/node/ptr.h"
 #include "yaml-cpp/node/detail/node_data.h"
-#include <boost/utility.hpp>
 
 namespace YAML {
 namespace detail {
-class node_ref : private boost::noncopyable {
+class node_ref {
  public:
   node_ref() : m_pData(new node_data) {}
+  node_ref(const node_ref&) = delete;
+  node_ref& operator=(const node_ref&) = delete;
 
   bool is_defined() const { return m_pData->is_defined(); }
   const Mark& mark() const { return m_pData->mark(); }

include/yaml-cpp/node/ptr.h

@@ -8,7 +8,7 @@
 #endif
 
 #include "yaml-cpp/dll.h"
-#include <boost/shared_ptr.hpp>
+#include <memory>
 
 namespace YAML {
 namespace detail {
@@ -18,11 +18,11 @@ class node_data;
 class memory;
 class memory_holder;
 
-typedef boost::shared_ptr<node> shared_node;
-typedef boost::shared_ptr<node_ref> shared_node_ref;
-typedef boost::shared_ptr<node_data> shared_node_data;
-typedef boost::shared_ptr<memory_holder> shared_memory_holder;
-typedef boost::shared_ptr<memory> shared_memory;
+typedef std::shared_ptr<node> shared_node;
+typedef std::shared_ptr<node_ref> shared_node_ref;
+typedef std::shared_ptr<node_data> shared_node_data;
+typedef std::shared_ptr<memory_holder> shared_memory_holder;
+typedef std::shared_ptr<memory> shared_memory;
 }
 }
 

include/yaml-cpp/parser.h

@@ -40,8 +40,8 @@ class YAML_CPP_API Parser : private noncopyable {
   void HandleTagDirective(const Token& token);
 
  private:
-  std::auto_ptr<Scanner> m_pScanner;
-  std::auto_ptr<Directives> m_pDirectives;
+  std::unique_ptr<Scanner> m_pScanner;
+  std::unique_ptr<Directives> m_pDirectives;
 };
 }
 

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;

test/CMakeLists.txt

@@ -10,7 +10,7 @@ endif()
 
 if("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU" OR
    "${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
-  set(yaml_test_flags "-Wno-c99-extensions -Wno-variadic-macros -Wno-sign-compare")
+  set(yaml_test_flags "-Wno-c99-extensions -Wno-variadic-macros -Wno-sign-compare -std=c++11")
 endif()
 
 file(GLOB test_headers [a-z_]*.h)

util/CMakeLists.txt

@@ -1,11 +1,14 @@
 add_sources(parse.cpp)
 add_executable(parse parse.cpp)
 target_link_libraries(parse yaml-cpp)
+set_target_properties(parse PROPERTIES COMPILE_FLAGS "-std=c++11")
 
 add_sources(sandbox.cpp)
 add_executable(sandbox sandbox.cpp)
 target_link_libraries(sandbox yaml-cpp)
+set_target_properties(sandbox PROPERTIES COMPILE_FLAGS "-std=c++11")
 
 add_sources(read.cpp)
 add_executable(read read.cpp)
 target_link_libraries(read yaml-cpp)
+set_target_properties(read PROPERTIES COMPILE_FLAGS "-std=c++11")