Update version to 0.6.3.

* CMake: Prefix options with "YAML" and hide platform-specific options

When including yaml-cpp as a subproject, some option names can conflict with other projects.

(1) Make sure the yaml-cpp options are prefixed with YAML
(2) Hide platform-specific options when possible to avoid cluttering the cmake option list

* Update docs for change from BUILD_SHARED_LIBS to YAML_BUILD_SHARED_LIBS

CMakeLists.txt

@@ -9,13 +9,7 @@ include(CheckCXXCompilerFlag)
 ###
 ### Project settings
 ###
-project(YAML_CPP)
-
-set(YAML_CPP_VERSION_MAJOR "0")
-set(YAML_CPP_VERSION_MINOR "6")
-set(YAML_CPP_VERSION_PATCH "2")
-set(YAML_CPP_VERSION "${YAML_CPP_VERSION_MAJOR}.${YAML_CPP_VERSION_MINOR}.${YAML_CPP_VERSION_PATCH}")
-
+project(YAML_CPP VERSION 0.6.3)
 
 ###
 ### Project options
@@ -30,20 +24,20 @@ option(YAML_CPP_INSTALL "Enable generation of install target" ON)
 # --> General
 # see http://www.cmake.org/cmake/help/cmake2.6docs.html#variable:BUILD_SHARED_LIBS
 #     http://www.cmake.org/cmake/help/cmake2.6docs.html#command:add_library
-option(BUILD_SHARED_LIBS "Build Shared Libraries" OFF)
-
-# Set minimum C++ to 2011 standards
-set(CMAKE_CXX_STANDARD 11)
-set(CMAKE_CXX_STANDARD_REQUIRED ON)
+option(YAML_BUILD_SHARED_LIBS "Build Shared Libraries" OFF)
 
 # --> Apple
-option(APPLE_UNIVERSAL_BIN "Apple: Build universal binary" OFF)
+if(APPLE)
+    option(YAML_APPLE_UNIVERSAL_BIN "Apple: Build universal binary" OFF)
+endif()
 
 # --> Microsoft Visual C++
 # see http://msdn.microsoft.com/en-us/library/aa278396(v=VS.60).aspx
 #     http://msdn.microsoft.com/en-us/library/2kzt1wy3(v=VS.71).aspx
-option(MSVC_SHARED_RT "MSVC: Build with shared runtime libs (/MD)" ON)
-option(MSVC_STHREADED_RT "MSVC: Build with single-threaded static runtime libs (/ML until VS .NET 2003)" OFF)
+if(MSVC)
+    option(YAML_MSVC_SHARED_RT "MSVC: Build with shared runtime libs (/MD)" ON)
+    option(YAML_MSVC_STHREADED_RT "MSVC: Build with single-threaded static runtime libs (/ML until VS .NET 2003)" OFF)
+endif()
 
 ###
 ### Sources, headers, directories and libs
@@ -116,14 +110,14 @@ endif()
 set(yaml_c_flags ${CMAKE_C_FLAGS})
 set(yaml_cxx_flags ${CMAKE_CXX_FLAGS})
 
-if(BUILD_SHARED_LIBS)
+if(YAML_BUILD_SHARED_LIBS)
 	set(LABEL_SUFFIX "shared")
 else()
 	set(LABEL_SUFFIX "static")
 endif()
 
 if(APPLE)
-	if(APPLE_UNIVERSAL_BIN)
+	if(YAML_APPLE_UNIVERSAL_BIN)
 		set(CMAKE_OSX_ARCHITECTURES ppc;i386)
 	endif()
 endif()
@@ -134,7 +128,7 @@ if(IPHONE)
 endif()
 
 if(WIN32)
-	if(BUILD_SHARED_LIBS)
+	if(YAML_BUILD_SHARED_LIBS)
 		add_definitions(-D${PROJECT_NAME}_DLL)	# use or build Windows DLL
 	endif()
 	if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
@@ -161,7 +155,7 @@ if(CMAKE_CXX_COMPILER_ID MATCHES "GNU" OR
 	#
 	set(GCC_EXTRA_OPTIONS "")
 	#
-	if(BUILD_SHARED_LIBS)
+	if(YAML_BUILD_SHARED_LIBS)
 		set(GCC_EXTRA_OPTIONS "${GCC_EXTRA_OPTIONS} -fPIC")
 	endif()
 	#
@@ -196,8 +190,8 @@ if(MSVC)
 	set(LIB_RT_SUFFIX "md")	# CMake defaults to /MD for MSVC
 	set(LIB_RT_OPTION "/MD")
 	#
-	if(NOT MSVC_SHARED_RT)	# User wants to have static runtime libraries (/MT, /ML)
-		if(MSVC_STHREADED_RT)	# User wants to have old single-threaded static runtime libraries
+	if(NOT YAML_MSVC_SHARED_RT)	# User wants to have static runtime libraries (/MT, /ML)
+		if(YAML_MSVC_STHREADED_RT)	# User wants to have old single-threaded static runtime libraries
 			set(LIB_RT_SUFFIX "ml")
 			set(LIB_RT_OPTION "/ML")
 			if(NOT ${MSVC_VERSION} LESS 1400)
@@ -227,7 +221,7 @@ if(MSVC)
 	set(CMAKE_STATIC_LIBRARY_PREFIX "lib")	# to distinguish static libraries from DLL import libs
 
 	# c) Correct suffixes for static libraries
-	if(NOT BUILD_SHARED_LIBS)
+	if(NOT YAML_BUILD_SHARED_LIBS)
 		### General stuff
 		set(LIB_TARGET_SUFFIX "${LIB_SUFFIX}${LIB_RT_SUFFIX}")
 	endif()
@@ -258,7 +252,11 @@ set(_INSTALL_DESTINATIONS
 ###
 ### Library
 ###
-add_library(yaml-cpp ${library_sources})
+if(YAML_BUILD_SHARED_LIBS)
+    add_library(yaml-cpp SHARED ${library_sources})
+else()
+    add_library(yaml-cpp STATIC ${library_sources})
+endif()
 
 if (NOT CMAKE_VERSION VERSION_LESS 2.8.12)
     target_include_directories(yaml-cpp
@@ -267,6 +265,11 @@ if (NOT CMAKE_VERSION VERSION_LESS 2.8.12)
         PRIVATE $<BUILD_INTERFACE:${YAML_CPP_SOURCE_DIR}/src>)
 endif()
 
+set_target_properties(yaml-cpp PROPERTIES
+    CXX_STANDARD 11
+    CXX_STANDARD_REQUIRED ON
+)
+
 set_target_properties(yaml-cpp PROPERTIES
   COMPILE_FLAGS "${yaml_c_flags} ${yaml_cxx_flags}"
 )
@@ -284,7 +287,7 @@ if(IPHONE)
 endif()
 
 if(MSVC)
-	if(NOT BUILD_SHARED_LIBS)
+	if(NOT YAML_BUILD_SHARED_LIBS)
 		# correct library names
 		set_target_properties(yaml-cpp PROPERTIES
 			DEBUG_POSTFIX "${LIB_TARGET_SUFFIX}d"

README.md

@@ -26,7 +26,7 @@ cd build
 3. Run CMake. The basic syntax is:
 
 ```
-cmake [-G generator] [-DBUILD_SHARED_LIBS=ON|OFF] ..
+cmake [-G generator] [-DYAML_BUILD_SHARED_LIBS=ON|OFF] ..
 ```
 
   * The `generator` is whatever type of build system you'd like to use. To see a full list of generators on your platform, just run `cmake` (with no arguments). For example:
@@ -34,7 +34,7 @@ cmake [-G generator] [-DBUILD_SHARED_LIBS=ON|OFF] ..
     * On OS X, you might use "Xcode" to generate an Xcode project
     * On a UNIX-y system, simply omit the option to generate a makefile
 
-  * yaml-cpp defaults to building a static library, but you may build a shared library by specifying `-DBUILD_SHARED_LIBS=ON`.
+  * yaml-cpp defaults to building a static library, but you may build a shared library by specifying `-DYAML_BUILD_SHARED_LIBS=ON`.
 
   * For more options on customizing the build, see the [CMakeLists.txt](https://github.com/jbeder/yaml-cpp/blob/master/CMakeLists.txt) file.
 

include/yaml-cpp/binary.h

@@ -39,7 +39,7 @@ class YAML_CPP_API Binary {
       rhs.clear();
       rhs.resize(m_unownedSize);
       std::copy(m_unownedData, m_unownedData + m_unownedSize, rhs.begin());
-      m_unownedData = 0;
+      m_unownedData = nullptr;
       m_unownedSize = 0;
     } else {
       m_data.swap(rhs);

include/yaml-cpp/emitter.h

@@ -7,10 +7,13 @@
 #pragma once
 #endif
 
+#include <cmath>
 #include <cstddef>
+#include <limits>
 #include <memory>
 #include <sstream>
 #include <string>
+#include <type_traits>
 
 #include "yaml-cpp/binary.h"
 #include "yaml-cpp/dll.h"
@@ -153,7 +156,28 @@ inline Emitter& Emitter::WriteStreamable(T value) {
 
   std::stringstream stream;
   SetStreamablePrecision<T>(stream);
-  stream << value;
+
+  bool special = false;
+  if (std::is_floating_point<T>::value) {
+    if ((std::numeric_limits<T>::has_quiet_NaN ||
+         std::numeric_limits<T>::has_signaling_NaN) &&
+        std::isnan(value)) {
+      special = true;
+      stream << ".nan";
+    } else if (std::numeric_limits<T>::has_infinity) {
+      if (value == std::numeric_limits<T>::infinity()) {
+        special = true;
+        stream << ".inf";
+      } else if (value == -std::numeric_limits<T>::infinity()) {
+        special = true;
+        stream << "-.inf";
+      }
+    }
+  }
+
+  if (!special) {
+    stream << value;
+  }
   m_stream << stream.str();
 
   StartedScalar();

include/yaml-cpp/exceptions.h

@@ -114,6 +114,35 @@ inline const std::string KEY_NOT_FOUND_WITH_KEY(
   stream << KEY_NOT_FOUND << ": " << key;
   return stream.str();
 }
+
+template <typename T>
+inline const std::string BAD_SUBSCRIPT_WITH_KEY(
+    const T&, typename disable_if<is_numeric<T>>::type* = nullptr) {
+  return BAD_SUBSCRIPT;
+}
+
+inline const std::string BAD_SUBSCRIPT_WITH_KEY(const std::string& key) {
+  std::stringstream stream;
+  stream << BAD_SUBSCRIPT << " (key: \"" << key << "\")";
+  return stream.str();
+}
+
+template <typename T>
+inline const std::string BAD_SUBSCRIPT_WITH_KEY(
+    const T& key, typename enable_if<is_numeric<T>>::type* = nullptr) {
+  std::stringstream stream;
+  stream << BAD_SUBSCRIPT << " (key: \"" << key << "\")";
+  return stream.str();
+}
+
+inline const std::string INVALID_NODE_WITH_KEY(const std::string& key) {
+  std::stringstream stream;
+  if (key.empty()) {
+    return INVALID_NODE;
+  }
+  stream << "invalid node; first invalid key: \"" << key << "\"";
+  return stream.str();
+}
 }
 
 class YAML_CPP_API Exception : public std::runtime_error {
@@ -131,7 +160,7 @@ class YAML_CPP_API Exception : public std::runtime_error {
   static const std::string build_what(const Mark& mark,
                                       const std::string& msg) {
     if (mark.is_null()) {
-      return msg.c_str();
+      return msg;
     }
 
     std::stringstream output;
@@ -194,8 +223,9 @@ inline TypedKeyNotFound<T> MakeTypedKeyNotFound(const Mark& mark,
 
 class YAML_CPP_API InvalidNode : public RepresentationException {
  public:
-  InvalidNode()
-      : RepresentationException(Mark::null_mark(), ErrorMsg::INVALID_NODE) {}
+  InvalidNode(std::string key)
+      : RepresentationException(Mark::null_mark(),
+                                ErrorMsg::INVALID_NODE_WITH_KEY(key)) {}
   InvalidNode(const InvalidNode&) = default;
   virtual ~InvalidNode() YAML_CPP_NOEXCEPT;
 };
@@ -224,8 +254,10 @@ class YAML_CPP_API BadDereference : public RepresentationException {
 
 class YAML_CPP_API BadSubscript : public RepresentationException {
  public:
-  BadSubscript()
-      : RepresentationException(Mark::null_mark(), ErrorMsg::BAD_SUBSCRIPT) {}
+  template <typename Key>
+  BadSubscript(const Key& key)
+      : RepresentationException(Mark::null_mark(),
+                                ErrorMsg::BAD_SUBSCRIPT_WITH_KEY(key)) {}
   BadSubscript(const BadSubscript&) = default;
   virtual ~BadSubscript() YAML_CPP_NOEXCEPT;
 };

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

@@ -17,7 +17,7 @@ template <typename Key, typename Enable = void>
 struct get_idx {
   static node* get(const std::vector<node*>& /* sequence */,
                    const Key& /* key */, shared_memory_holder /* pMemory */) {
-    return 0;
+    return nullptr;
   }
 };
 
@@ -27,7 +27,7 @@ struct get_idx<Key,
                                        !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;
+    return key < sequence.size() ? sequence[key] : nullptr;
   }
 
   static node* get(std::vector<node*>& sequence, const Key& key,
@@ -46,13 +46,13 @@ struct get_idx<Key, typename std::enable_if<std::is_signed<Key>::value>::type> {
                    shared_memory_holder pMemory) {
     return key >= 0 ? get_idx<std::size_t>::get(
                           sequence, static_cast<std::size_t>(key), pMemory)
-                    : 0;
+                    : nullptr;
   }
   static node* get(std::vector<node*>& sequence, const Key& key,
                    shared_memory_holder pMemory) {
     return key >= 0 ? get_idx<std::size_t>::get(
                           sequence, static_cast<std::size_t>(key), pMemory)
-                    : 0;
+                    : nullptr;
   }
 };
 
@@ -109,13 +109,13 @@ inline node* node_data::get(const Key& key,
       break;
     case NodeType::Undefined:
     case NodeType::Null:
-      return NULL;
+      return nullptr;
     case NodeType::Sequence:
       if (node* pNode = get_idx<Key>::get(m_sequence, key, pMemory))
         return pNode;
-      return NULL;
+      return nullptr;
     case NodeType::Scalar:
-      throw BadSubscript();
+      throw BadSubscript(key);
   }
 
   for (node_map::const_iterator it = m_map.begin(); it != m_map.end(); ++it) {
@@ -124,7 +124,7 @@ inline node* node_data::get(const Key& key,
     }
   }
 
-  return NULL;
+  return nullptr;
 }
 
 template <typename Key>
@@ -143,7 +143,7 @@ inline node& node_data::get(const Key& key, shared_memory_holder pMemory) {
       convert_to_map(pMemory);
       break;
     case NodeType::Scalar:
-      throw BadSubscript();
+      throw BadSubscript(key);
   }
 
   for (node_map::const_iterator it = m_map.begin(); it != m_map.end(); ++it) {

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

@@ -26,9 +26,9 @@ template <typename V>
 struct node_iterator_value : public std::pair<V*, V*> {
   typedef std::pair<V*, V*> kv;
 
-  node_iterator_value() : kv(), pNode(0) {}
+  node_iterator_value() : kv(), pNode(nullptr) {}
   explicit node_iterator_value(V& rhs) : kv(), pNode(&rhs) {}
-  explicit node_iterator_value(V& key, V& value) : kv(&key, &value), pNode(0) {}
+  explicit node_iterator_value(V& key, V& value) : kv(&key, &value), pNode(nullptr) {}
 
   V& operator*() const { return *pNode; }
   V& operator->() const { return *pNode; }

include/yaml-cpp/node/impl.h

@@ -12,13 +12,16 @@
 #include "yaml-cpp/node/detail/node.h"
 #include "yaml-cpp/node/iterator.h"
 #include "yaml-cpp/node/node.h"
+#include <sstream>
 #include <string>
 
 namespace YAML {
-inline Node::Node() : m_isValid(true), m_pMemory(nullptr), m_pNode(nullptr) {}
+inline Node::Node()
+    : m_isValid(true), m_invalidKey{}, m_pMemory(nullptr), m_pNode(nullptr) {}
 
 inline Node::Node(NodeType::value type)
     : m_isValid(true),
+      m_invalidKey{},
       m_pMemory(new detail::memory_holder),
       m_pNode(&m_pMemory->create_node()) {
   m_pNode->set_type(type);
@@ -27,6 +30,7 @@ inline Node::Node(NodeType::value type)
 template <typename T>
 inline Node::Node(const T& rhs)
     : m_isValid(true),
+      m_invalidKey{},
       m_pMemory(new detail::memory_holder),
       m_pNode(&m_pMemory->create_node()) {
   Assign(rhs);
@@ -34,24 +38,30 @@ inline Node::Node(const T& rhs)
 
 inline Node::Node(const detail::iterator_value& rhs)
     : m_isValid(rhs.m_isValid),
+      m_invalidKey(rhs.m_invalidKey),
       m_pMemory(rhs.m_pMemory),
       m_pNode(rhs.m_pNode) {}
 
 inline Node::Node(const Node& rhs)
     : m_isValid(rhs.m_isValid),
+      m_invalidKey(rhs.m_invalidKey),
       m_pMemory(rhs.m_pMemory),
       m_pNode(rhs.m_pNode) {}
 
-inline Node::Node(Zombie) : m_isValid(false), m_pMemory{}, m_pNode(nullptr) {}
+inline Node::Node(Zombie)
+    : m_isValid(false), m_invalidKey{}, m_pMemory{}, m_pNode(nullptr) {}
+
+inline Node::Node(Zombie, const std::string& key)
+    : m_isValid(false), m_invalidKey(key), m_pMemory{}, m_pNode(nullptr) {}
 
 inline Node::Node(detail::node& node, detail::shared_memory_holder pMemory)
-    : m_isValid(true), m_pMemory(pMemory), m_pNode(&node) {}
+    : m_isValid(true), m_invalidKey{}, m_pMemory(pMemory), m_pNode(&node) {}
 
 inline Node::~Node() {}
 
 inline void Node::EnsureNodeExists() const {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   if (!m_pNode) {
     m_pMemory.reset(new detail::memory_holder);
     m_pNode = &m_pMemory->create_node();
@@ -68,14 +78,14 @@ inline bool Node::IsDefined() const {
 
 inline Mark Node::Mark() const {
   if (!m_isValid) {
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   }
   return m_pNode ? m_pNode->mark() : Mark::null_mark();
 }
 
 inline NodeType::value Node::Type() const {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   return m_pNode ? m_pNode->type() : NodeType::Null;
 }
 
@@ -142,7 +152,7 @@ struct as_if<std::string, void> {
 template <typename T>
 inline T Node::as() const {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   return as_if<T, void>(*this)();
 }
 
@@ -155,32 +165,32 @@ inline T Node::as(const S& fallback) const {
 
 inline const std::string& Node::Scalar() const {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   return m_pNode ? m_pNode->scalar() : detail::node_data::empty_scalar();
 }
 
 inline const std::string& Node::Tag() const {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   return m_pNode ? m_pNode->tag() : detail::node_data::empty_scalar();
 }
 
 inline void Node::SetTag(const std::string& tag) {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   EnsureNodeExists();
   m_pNode->set_tag(tag);
 }
 
 inline EmitterStyle::value Node::Style() const {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   return m_pNode ? m_pNode->style() : EmitterStyle::Default;
 }
 
 inline void Node::SetStyle(EmitterStyle::value style) {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   EnsureNodeExists();
   m_pNode->set_style(style);
 }
@@ -188,7 +198,7 @@ inline void Node::SetStyle(EmitterStyle::value style) {
 // assignment
 inline bool Node::is(const Node& rhs) const {
   if (!m_isValid || !rhs.m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   if (!m_pNode || !rhs.m_pNode)
     return false;
   return m_pNode->is(*rhs.m_pNode);
@@ -197,14 +207,14 @@ inline bool Node::is(const Node& rhs) const {
 template <typename T>
 inline Node& Node::operator=(const T& rhs) {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   Assign(rhs);
   return *this;
 }
 
 inline Node& Node::operator=(const Node& rhs) {
   if (!m_isValid || !rhs.m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   if (is(rhs))
     return *this;
   AssignNode(rhs);
@@ -213,7 +223,7 @@ inline Node& Node::operator=(const Node& rhs) {
 
 inline void Node::reset(const YAML::Node& rhs) {
   if (!m_isValid || !rhs.m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   m_pMemory = rhs.m_pMemory;
   m_pNode = rhs.m_pNode;
 }
@@ -221,35 +231,35 @@ inline void Node::reset(const YAML::Node& rhs) {
 template <typename T>
 inline void Node::Assign(const T& rhs) {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   AssignData(convert<T>::encode(rhs));
 }
 
 template <>
 inline void Node::Assign(const std::string& rhs) {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   EnsureNodeExists();
   m_pNode->set_scalar(rhs);
 }
 
 inline void Node::Assign(const char* rhs) {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   EnsureNodeExists();
   m_pNode->set_scalar(rhs);
 }
 
 inline void Node::Assign(char* rhs) {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   EnsureNodeExists();
   m_pNode->set_scalar(rhs);
 }
 
 inline void Node::AssignData(const Node& rhs) {
   if (!m_isValid || !rhs.m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   EnsureNodeExists();
   rhs.EnsureNodeExists();
 
@@ -259,7 +269,7 @@ inline void Node::AssignData(const Node& rhs) {
 
 inline void Node::AssignNode(const Node& rhs) {
   if (!m_isValid || !rhs.m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   rhs.EnsureNodeExists();
 
   if (!m_pNode) {
@@ -276,7 +286,7 @@ inline void Node::AssignNode(const Node& rhs) {
 // size/iterator
 inline std::size_t Node::size() const {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   return m_pNode ? m_pNode->size() : 0;
 }
 
@@ -309,13 +319,13 @@ inline iterator Node::end() {
 template <typename T>
 inline void Node::push_back(const T& rhs) {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   push_back(Node(rhs));
 }
 
 inline void Node::push_back(const Node& rhs) {
   if (!m_isValid || !rhs.m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   EnsureNodeExists();
   rhs.EnsureNodeExists();
 
@@ -368,16 +378,21 @@ inline typename to_value_t<T>::return_type to_value(const T& t) {
 }
 }  // namespace detail
 
+template<typename Key>
+std::string key_to_string(const Key& key) {
+  return streamable_to_string<Key, is_streamable<std::stringstream, Key>::value>().impl(key);
+}
+
 // indexing
 template <typename Key>
 inline const Node Node::operator[](const Key& key) const {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   EnsureNodeExists();
   detail::node* value = static_cast<const detail::node&>(*m_pNode).get(
       detail::to_value(key), m_pMemory);
   if (!value) {
-    return Node(ZombieNode);
+    return Node(ZombieNode, key_to_string(key));
   }
   return Node(*value, m_pMemory);
 }
@@ -385,7 +400,7 @@ inline const Node Node::operator[](const Key& key) const {
 template <typename Key>
 inline Node Node::operator[](const Key& key) {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   EnsureNodeExists();
   detail::node& value = m_pNode->get(detail::to_value(key), m_pMemory);
   return Node(value, m_pMemory);
@@ -394,28 +409,28 @@ inline Node Node::operator[](const Key& key) {
 template <typename Key>
 inline bool Node::remove(const Key& key) {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   EnsureNodeExists();
   return m_pNode->remove(detail::to_value(key), m_pMemory);
 }
 
 inline const Node Node::operator[](const Node& key) const {
   if (!m_isValid || !key.m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   EnsureNodeExists();
   key.EnsureNodeExists();
   m_pMemory->merge(*key.m_pMemory);
   detail::node* value =
       static_cast<const detail::node&>(*m_pNode).get(*key.m_pNode, m_pMemory);
   if (!value) {
-    return Node(ZombieNode);
+    return Node(ZombieNode, key_to_string(key));
   }
   return Node(*value, m_pMemory);
 }
 
 inline Node Node::operator[](const Node& key) {
   if (!m_isValid || !key.m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   EnsureNodeExists();
   key.EnsureNodeExists();
   m_pMemory->merge(*key.m_pMemory);
@@ -425,7 +440,7 @@ inline Node Node::operator[](const Node& key) {
 
 inline bool Node::remove(const Node& key) {
   if (!m_isValid || !key.m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   EnsureNodeExists();
   key.EnsureNodeExists();
   return m_pNode->remove(*key.m_pNode, m_pMemory);
@@ -435,7 +450,7 @@ inline bool Node::remove(const Node& key) {
 template <typename Key, typename Value>
 inline void Node::force_insert(const Key& key, const Value& value) {
   if (!m_isValid)
-    throw InvalidNode();
+    throw InvalidNode(m_invalidKey);
   EnsureNodeExists();
   m_pNode->force_insert(detail::to_value(key), detail::to_value(value),
                         m_pMemory);

include/yaml-cpp/node/node.h

@@ -8,6 +8,7 @@
 #endif
 
 #include <stdexcept>
+#include <string>
 
 #include "yaml-cpp/dll.h"
 #include "yaml-cpp/emitterstyle.h"
@@ -116,6 +117,7 @@ class YAML_CPP_API Node {
  private:
   enum Zombie { ZombieNode };
   explicit Node(Zombie);
+  explicit Node(Zombie, const std::string&);
   explicit Node(detail::node& node, detail::shared_memory_holder pMemory);
 
   void EnsureNodeExists() const;
@@ -130,6 +132,8 @@ class YAML_CPP_API Node {
 
  private:
   bool m_isValid;
+  // String representation of invalid key, if the node is invalid.
+  std::string m_invalidKey;
   mutable detail::shared_memory_holder m_pMemory;
   mutable detail::node* m_pNode;
 };

include/yaml-cpp/ostream_wrapper.h

@@ -30,7 +30,7 @@ class YAML_CPP_API ostream_wrapper {
 
   const char* str() const {
     if (m_pStream) {
-      return 0;
+      return nullptr;
     } else {
       m_buffer[m_pos] = '\0';
       return &m_buffer[0];

include/yaml-cpp/traits.h

@@ -7,6 +7,11 @@
 #pragma once
 #endif
 
+#include <type_traits>
+#include <utility>
+#include <string>
+#include <sstream>
+
 namespace YAML {
 template <typename>
 struct is_numeric {
@@ -100,4 +105,31 @@ template <class Cond, class T = void>
 struct disable_if : public disable_if_c<Cond::value, T> {};
 }
 
+template <typename S, typename T>
+struct is_streamable {
+  template <typename SS, typename TT>
+  static auto test(int)
+      -> decltype(std::declval<SS&>() << std::declval<TT>(), std::true_type());
+
+  template <typename, typename>
+  static auto test(...) -> std::false_type;
+
+  static const bool value = decltype(test<S, T>(0))::value;
+};
+
+template<typename Key, bool Streamable>
+struct streamable_to_string {
+  static std::string impl(const Key& key) {
+    std::stringstream ss;
+    ss << key;
+    return ss.str();
+  }
+};
+
+template<typename Key>
+struct streamable_to_string<Key, false> {
+  static std::string impl(const Key&) {
+    return "";
+  }
+};
 #endif  // TRAITS_H_62B23520_7C8E_11DE_8A39_0800200C9A66

src/node_data.cpp

@@ -196,7 +196,7 @@ void node_data::insert(node& key, node& value, shared_memory_holder pMemory) {
       convert_to_map(pMemory);
       break;
     case NodeType::Scalar:
-      throw BadSubscript();
+      throw BadSubscript(key);
   }
 
   insert_map_pair(key, value);
@@ -226,7 +226,7 @@ node& node_data::get(node& key, shared_memory_holder pMemory) {
       convert_to_map(pMemory);
       break;
     case NodeType::Scalar:
-      throw BadSubscript();
+      throw BadSubscript(key);
   }
 
   for (node_map::const_iterator it = m_map.begin(); it != m_map.end(); ++it) {

test/CMakeLists.txt

@@ -51,6 +51,11 @@ add_executable(run-tests
     ${test_headers}
 )
 
+set_target_properties(run-tests PROPERTIES
+    CXX_STANDARD 11
+    CXX_STANDARD_REQUIRED ON
+)
+
 add_dependencies(run-tests googletest_project)
 
 set_target_properties(run-tests PROPERTIES

test/integration/emitter_test.cpp

@@ -253,8 +253,9 @@ TEST_F(EmitterTest, ScalarFormat) {
   out << DoubleQuoted << "explicit double-quoted scalar";
   out << "auto-detected\ndouble-quoted scalar";
   out << "a non-\"auto-detected\" double-quoted scalar";
-  out << Literal << "literal scalar\nthat may span\nmany, many\nlines "
-                    "and have \"whatever\" crazy\tsymbols that we like";
+  out << Literal
+      << "literal scalar\nthat may span\nmany, many\nlines "
+         "and have \"whatever\" crazy\tsymbols that we like";
   out << EndSeq;
 
   ExpectEmit(
@@ -526,9 +527,10 @@ TEST_F(EmitterTest, SimpleComment) {
 
 TEST_F(EmitterTest, MultiLineComment) {
   out << BeginSeq;
-  out << "item 1" << Comment(
-                         "really really long\ncomment that couldn't "
-                         "possibly\nfit on one line");
+  out << "item 1"
+      << Comment(
+             "really really long\ncomment that couldn't "
+             "possibly\nfit on one line");
   out << "item 2";
   out << EndSeq;
 
@@ -984,6 +986,45 @@ TEST_F(EmitterTest, ValueOfBackslash) {
   ExpectEmit("foo: \"\\\\\"");
 }
 
+TEST_F(EmitterTest, Infinity) {
+  out << YAML::BeginMap;
+  out << YAML::Key << "foo" << YAML::Value
+      << std::numeric_limits<float>::infinity();
+  out << YAML::Key << "bar" << YAML::Value
+      << std::numeric_limits<double>::infinity();
+  out << YAML::EndMap;
+
+  ExpectEmit(
+	  "foo: .inf\n"
+	  "bar: .inf");
+}
+
+TEST_F(EmitterTest, NegInfinity) {
+  out << YAML::BeginMap;
+  out << YAML::Key << "foo" << YAML::Value
+      << -std::numeric_limits<float>::infinity();
+  out << YAML::Key << "bar" << YAML::Value
+      << -std::numeric_limits<double>::infinity();
+  out << YAML::EndMap;
+
+  ExpectEmit(
+	  "foo: -.inf\n"
+	  "bar: -.inf");
+}
+
+TEST_F(EmitterTest, NaN) {
+  out << YAML::BeginMap;
+  out << YAML::Key << "foo" << YAML::Value
+      << std::numeric_limits<float>::quiet_NaN();
+  out << YAML::Key << "bar" << YAML::Value
+      << std::numeric_limits<double>::quiet_NaN();
+  out << YAML::EndMap;
+
+  ExpectEmit(
+	  "foo: .nan\n"
+	  "bar: .nan");
+}
+
 class EmitterErrorTest : public ::testing::Test {
  protected:
   void ExpectEmitError(const std::string& expectedError) {
@@ -1034,5 +1075,5 @@ TEST_F(EmitterErrorTest, InvalidAlias) {
 
   ExpectEmitError(ErrorMsg::INVALID_ALIAS);
 }
-}
-}
+}  // namespace
+}  // namespace YAML

test/integration/error_messages_test.cpp

@@ -0,0 +1,61 @@
+#include "yaml-cpp/yaml.h"  // IWYU pragma: keep
+
+#include "gtest/gtest.h"
+
+#define EXPECT_THROW_EXCEPTION(exception_type, statement, message) \
+  ASSERT_THROW(statement, exception_type);                         \
+  try {                                                            \
+    statement;                                                     \
+  } catch (const exception_type& e) {                              \
+    EXPECT_EQ(e.msg, message);                                     \
+  }
+
+namespace YAML {
+namespace {
+
+TEST(ErrorMessageTest, BadSubscriptErrorMessage) {
+  const char *example_yaml = "first:\n"
+                             "   second: 1\n"
+                             "   third: 2\n";
+
+  Node doc = Load(example_yaml);
+
+  // Test that printable key is part of error message
+  EXPECT_THROW_EXCEPTION(YAML::BadSubscript, doc["first"]["second"]["fourth"],
+                         "operator[] call on a scalar (key: \"fourth\")");
+  
+  EXPECT_THROW_EXCEPTION(YAML::BadSubscript, doc["first"]["second"][37],
+                         "operator[] call on a scalar (key: \"37\")");
+
+
+  // Non-printable key is not included in error message
+  EXPECT_THROW_EXCEPTION(YAML::BadSubscript,
+                         doc["first"]["second"][std::vector<int>()],
+                         "operator[] call on a scalar");
+
+  EXPECT_THROW_EXCEPTION(YAML::BadSubscript, doc["first"]["second"][Node()],
+                         "operator[] call on a scalar");
+}
+
+TEST(ErrorMessageTest, Ex9_1_InvalidNodeErrorMessage) {
+  const char *example_yaml = "first:\n"
+                             "   second: 1\n"
+                             "   third: 2\n";
+
+  const Node doc = Load(example_yaml);
+
+  // Test that printable key is part of error message
+  EXPECT_THROW_EXCEPTION(YAML::InvalidNode, doc["first"]["fourth"].as<int>(),
+                         "invalid node; first invalid key: \"fourth\"");
+  
+  EXPECT_THROW_EXCEPTION(YAML::InvalidNode, doc["first"][37].as<int>(),
+                         "invalid node; first invalid key: \"37\"");
+ 
+  // Non-printable key is not included in error message
+  EXPECT_THROW_EXCEPTION(YAML::InvalidNode,
+                         doc["first"][std::vector<int>()].as<int>(),
+                         "invalid node; this may result from using a map "
+                         "iterator as a sequence iterator, or vice-versa");
+}
+}   
+}

util/CMakeLists.txt

@@ -2,13 +2,25 @@ cmake_minimum_required(VERSION 3.5)
 
 add_sources(parse.cpp)
 add_executable(parse parse.cpp)
+set_target_properties(parse PROPERTIES
+    CXX_STANDARD 11
+    CXX_STANDARD_REQUIRED ON
+)
 target_link_libraries(parse yaml-cpp)
 
 add_sources(sandbox.cpp)
 add_executable(sandbox sandbox.cpp)
+set_target_properties(sandbox PROPERTIES
+    CXX_STANDARD 11
+    CXX_STANDARD_REQUIRED ON
+)
 target_link_libraries(sandbox yaml-cpp)
 
 add_sources(read.cpp)
 add_executable(read read.cpp)
+set_target_properties(read PROPERTIES
+    CXX_STANDARD 11
+    CXX_STANDARD_REQUIRED ON
+)
 target_link_libraries(read yaml-cpp)