renamed value::value_arg_t to value_arg for consistency

also:
- added major version number to the hidden inline namespace
- documentation fixes

README.md

@@ -5,13 +5,13 @@
 [![GitHub](https://img.shields.io/github/license/marzer/tomlplusplus)](https://github.com/marzer/tomlplusplus/blob/master/LICENSE)  
 
 `toml++` is a header-only toml parser and serializer for C++17, C++20 and whatever comes after.
- - Fully [TOML v0.5.0]-compliant
- - Modern C++17 (with some C++20 features where supported)
+ - [TOML v0.5.0](https://github.com/toml-lang/toml/blob/master/versions/en/toml-v0.5.0.md), plus support for some
+ 	unreleased TOML features (these are optional)
+ - C++17 (plus some C++20 features where available, e.g. experimental support for char8_t strings)
  - Proper UTF-8 handling (incl. BOM)
  - Works with or without exceptions
  - Doesn't require RTTI
  - First-class support for serializing to JSON
- - Supports a number of 'unreleased' TOML features (optional)
 
 <br>
 

include/toml++/toml.h

@@ -53,41 +53,58 @@
 	#undef TOML_DOXYGEN
 	#undef TOML_RELOPS_REORDERING
 	#undef TOML_ASYMMETRICAL_EQUALITY_OPS
+	#undef TOML_INLINE_NS_EX
 	#undef TOML_START
+	#undef TOML_START_2
+	#undef TOML_START_1
 	#undef TOML_END
 	#undef TOML_IMPL_START
 	#undef TOML_IMPL_END
 #endif
 
 /// \mainpage toml++
 /// 
-/// This is the home of toml++, a header-only [TOML](https://github.com/toml-lang/toml) parser and serializer for C++17 and later.
+/// This is the home of toml++, a header-only [TOML](https://github.com/toml-lang/toml) parser and serializer for C++17
+/// and later.
 ///
 /// \tableofcontents
 /// 
 ///////////////////////////////////////////////////////////////////////
 /// 
 /// \section mainpage-features Features
-/// - C++17 (plus some C++20 features where supported, e.g. char8_t strings)
+/// - [TOML v0.5.0](https://github.com/toml-lang/toml/blob/master/versions/en/toml-v0.5.0.md), plus support for some
+///		unreleased TOML features (these are optional)
+/// - C++17 (plus some C++20 features where available, e.g. experimental support for char8_t strings)
 /// - Proper UTF-8 handling (incl. BOM)
 /// - Works with or without exceptions
 /// - Doesn't require RTTI
 /// - First-class support for serializing to JSON
-/// - Fully [TOML v0.5.0](https://github.com/toml-lang/toml/blob/master/versions/en/toml-v0.5.0.md)-compliant  
-/// - Supports a number of 'unreleased' TOML features (optional; these can be disabled)
 /// 
 ///////////////////////////////////////////////////////////////////////
 /// 
 /// \section mainpage-adding-lib Adding toml++ to your project
-/// Clone [the repository](https://github.com/marzer/tomlplusplus/) from GitHub. It's header-only so there's not much you have to do after that,
-/// other than some very minor (optional) configuration. See the [README](https://github.com/marzer/tomlplusplus/blob/master/README.md) for more info.
+/// It's header-only library so really all you have to do is clone
+/// [the repository](https://github.com/marzer/tomlplusplus/) from GitHub and set your include paths.
+/// There's some minor configuration you can do to customize some basic library functionality, but that's totally
+/// optional. See the [README](https://github.com/marzer/tomlplusplus/blob/master/README.md) for more info.
+/// 
+/// <blockquote>
+/// <h3>On Linkers and the One-Definition-Rule</h3>
+/// <p>Header-only libraries are great for minimal setup, but can cause ODR violations and complex linker errors
+/// in situations where multiple modules include them separately, each with different versions, configuration options,
+/// exception handling modes, et cetera.</p>
+/// <p>`toml++` attempts to combat this problem by nesting everything inside an additional inline namespace that
+/// changes according to the library's major version and the compiler's exception-handling mode.</p>
+/// </blockquote>
 /// 
 ///////////////////////////////////////////////////////////////////////
 /// 
 /// \section mainpage-api-documentation API Documentation
-/// You're looking at it! Browse the docs using the links at the top of the page. You can search from anywhere by pressing the TAB key.
+/// You're looking at it! Browse the docs using the links at the top of the page.
+/// You can search from anywhere by pressing the TAB key.
 /// 
-/// <em>toml++ is still pretty hot off the presses so there's going to be some omissions, typos and general sparseness throughout the docs.
+/// <em>toml++ is still pretty hot off the presses so there's going to be some omissions,
+/// typos and general sparseness throughout the docs.
 /// If you spot something or have a suggestion, please [let me know](https://github.com/marzer/tomlplusplus/issues)!</em>
 /// 
 ///////////////////////////////////////////////////////////////////////
@@ -99,7 +116,8 @@
 /// \subsection mainpage-example-parsing-files Parsing TOML files
 /// toml++ works whether you have exceptions enabled or not. For the most part the usage is the same,
 /// the main difference being how parsing errors are reported to the caller. When exceptions are enabled
-/// a toml::parse_error is thrown directly from the site of the error:
+/// a successful call to a parsing function simply returns a toml::table, whereas a failed call sees a toml::parse_error
+/// thrown directly from the site of the error:
 /// \cpp
 /// #include <iostream>
 /// #include <fstream> //required for parse_file()
@@ -129,7 +147,7 @@
 /// 
 /// \ecpp
 /// 
-/// When exceptions are disabled parsing methods return a toml::parse_result and it is up to the caller
+/// When exceptions are disabled parsing functions return a toml::parse_result instead and it is up to the caller
 /// to check if parsing has been successful by examining the return value:
 /// \cpp
 /// #include <iostream>
@@ -341,9 +359,13 @@
 /// 
 /// \section mainpage-license License
 ///  
-/// toml++ is licensed under the terms of the MIT license - see [LICENSE](https://github.com/marzer/tomlplusplus/blob/master/LICENSE).
+/// toml++ is licensed under the terms of the MIT license - see
+/// [LICENSE](https://github.com/marzer/tomlplusplus/blob/master/LICENSE).
 ///
-/// UTF-8 decoding is performed using a state machine based on Bjoern Hoehrmann's 'Flexible and Economical UTF - 8 Decoder', which is also subject
-/// to the terms of the MIT license - see [LICENSE-utf8-decoder](https://github.com/marzer/tomlplusplus/blob/master/LICENSE-utf8-decoder).
+/// UTF-8 decoding is performed using a state machine based on Bjoern Hoehrmann's
+/// 'Flexible and Economical UTF - 8 Decoder', which is also subject to the terms of the MIT license - see
+/// [LICENSE-utf8-decoder](https://github.com/marzer/tomlplusplus/blob/master/LICENSE-utf8-decoder).
 ///  
+/// \remark Note that if you're using the single-header version of the library you don't need to distribute these files;
+/// 		their contents is included in the preamble at the top of the file.
 /// 

include/toml++/toml_common.h

@@ -229,17 +229,6 @@
 		__VA_ARGS__ [[nodiscard]] friend bool operator != (RHS rhs, LHS lhs) noexcept { return !(lhs == rhs); }
 #endif
 
-#if !TOML_DOXYGEN
-	#if TOML_EXCEPTIONS
-		#define TOML_START	namespace toml { inline namespace wex
-	#else
-		#define TOML_START	namespace toml { inline namespace woex
-	#endif
-	#define TOML_END			}
-#endif
-#define TOML_IMPL_START			TOML_START { namespace impl
-#define TOML_IMPL_END			} TOML_END
-
 #include "toml_version.h"
 
 #define TOML_MAKE_VERSION(maj, min, rev)											\
@@ -262,6 +251,22 @@
 #define TOML_LANG_EXACTLY(maj, min, rev)											\
 		(TOML_LANG_EFFECTIVE_VERSION == TOML_MAKE_VERSION(maj, min, rev))
 
+#if !TOML_DOXYGEN
+
+	#if TOML_EXCEPTIONS
+		#define TOML_INLINE_NS_EX
+	#else
+		#define TOML_INLINE_NS_EX _noex
+	#endif
+
+	#define TOML_START_2(VER, ARG1, ARG2)	namespace toml { inline namespace v##VER##ARG1##ARG2
+	#define TOML_START_1(VER, ARG1, ARG2)	TOML_START_2(VER, ARG1, ARG2)
+	#define TOML_START		TOML_START_1(TOML_LIB_MAJOR,TOML_INLINE_NS_EX,)
+	#define TOML_END		}
+
+#endif
+#define TOML_IMPL_START		TOML_START { namespace impl
+#define TOML_IMPL_END		} TOML_END
 
 ////////// INCLUDES
 

include/toml++/toml_node_view.h

@@ -35,17 +35,18 @@ TOML_START
 	/// 
 	/// tbl["products"][0]["keywords"].as_array()->push_back("heavy");
 	/// std::cout << tbl["products"][0]["keywords"] << std::endl;
-	/// std::cout << "has third product: "sv << !!tbl["products"][2] << std::endl;
-	/// std::cout << tbl["products"][2] << std::endl; // no-op
-	/// 
-	/// \ecpp
+	/// std::cout << "has product[2]: "sv << !!tbl["products"][2] << std::endl;
+	/// std::cout << "product[2]: "sv << tbl["products"][2] << std::endl;
+		/// \ecpp
 	/// 
 	/// \out
 	/// "my hardware store"
 	/// "Hammer"
 	/// [ "hammer", "construction", "build" ]
+	/// "build"
 	/// [ "hammer", "construction", "build", "heavy" ]
-	/// has third product: false
+	/// has product[2]: false
+	/// product[2]:
 	/// \eout
 	template <typename T>
 	class node_view final

include/toml++/toml_value.h

@@ -42,6 +42,17 @@ TOML_START
 			/// \brief	The value's underlying data type.
 			using value_type = T;
 
+			/// \brief	A type alias for 'value arguments'.
+			/// \details This differs according to the value's type argument:
+			/// 		 - ints, floats, booleans: `value_type`
+			/// 		 - strings: `string_view`
+			/// 		 - everything else: `const value_type&`
+			using value_arg = std::conditional_t<
+				std::is_same_v<T, string>,
+				string_view,
+				std::conditional_t<impl::is_one_of<T, double, int64_t, bool>, T, const T&>
+			>;
+
 			/// \brief	Constructs a toml value.
 			///
 			/// \tparam	U	Constructor argument types.
@@ -167,19 +178,8 @@ TOML_START
 				return lhs;
 			}
 
-			/// \brief	A type alias for 'value arguments'.
-			/// \details This differs according to the value's type argument:
-			/// 		 - ints, floats, booleans: `value_type`
-			/// 		 - strings: `string_view`
-			/// 		 - everything else: `const value_type&`
-			using value_arg_t = std::conditional_t<
-				std::is_same_v<T, string>,
-				string_view,
-				std::conditional_t<impl::is_one_of<T, double, int64_t, bool>, T, const T&>
-			>;
-
 			/// \brief	Value-assignment operator.
-			value& operator= (value_arg_t rhs) noexcept
+			value& operator= (value_arg rhs) noexcept
 			{
 				if constexpr (std::is_same_v<T, string>)
 					val_.assign(rhs);
@@ -196,26 +196,26 @@ TOML_START
 			}
 
 			/// \brief	Value equality operator.
-			[[nodiscard]] friend bool operator == (const value& lhs, value_arg_t rhs) noexcept { return lhs.val_ == rhs; }
-			TOML_ASYMMETRICAL_EQUALITY_OPS(const value&, value_arg_t, )
+			[[nodiscard]] friend bool operator == (const value& lhs, value_arg rhs) noexcept { return lhs.val_ == rhs; }
+			TOML_ASYMMETRICAL_EQUALITY_OPS(const value&, value_arg, )
 
 			/// \brief	Value less-than operator.
-			[[nodiscard]] friend bool operator <  (const value& lhs, value_arg_t rhs) noexcept { return lhs.val_ < rhs; }
+			[[nodiscard]] friend bool operator <  (const value& lhs, value_arg rhs) noexcept { return lhs.val_ < rhs; }
 			/// \brief	Value less-than operator.
-			[[nodiscard]] friend bool operator <  (value_arg_t lhs, const value& rhs) noexcept { return lhs < rhs.val_; }
+			[[nodiscard]] friend bool operator <  (value_arg lhs, const value& rhs) noexcept { return lhs < rhs.val_; }
 			/// \brief	Value less-than-or-equal-to operator.
-			[[nodiscard]] friend bool operator <= (const value& lhs, value_arg_t rhs) noexcept { return lhs.val_ <= rhs; }
+			[[nodiscard]] friend bool operator <= (const value& lhs, value_arg rhs) noexcept { return lhs.val_ <= rhs; }
 			/// \brief	Value less-than-or-equal-to operator.
-			[[nodiscard]] friend bool operator <= (value_arg_t lhs, const value& rhs) noexcept { return lhs <= rhs.val_; }
+			[[nodiscard]] friend bool operator <= (value_arg lhs, const value& rhs) noexcept { return lhs <= rhs.val_; }
 
 			/// \brief	Value greater-than operator.
-			[[nodiscard]] friend bool operator >  (const value& lhs, value_arg_t rhs) noexcept { return lhs.val_ > rhs; }
+			[[nodiscard]] friend bool operator >  (const value& lhs, value_arg rhs) noexcept { return lhs.val_ > rhs; }
 			/// \brief	Value greater-than operator.
-			[[nodiscard]] friend bool operator >  (value_arg_t lhs, const value& rhs) noexcept { return lhs > rhs.val_; }
+			[[nodiscard]] friend bool operator >  (value_arg lhs, const value& rhs) noexcept { return lhs > rhs.val_; }
 			/// \brief	Value greater-than-or-equal-to operator.
-			[[nodiscard]] friend bool operator >= (const value& lhs, value_arg_t rhs) noexcept { return lhs.val_ >= rhs; }
+			[[nodiscard]] friend bool operator >= (const value& lhs, value_arg rhs) noexcept { return lhs.val_ >= rhs; }
 			/// \brief	Value greater-than-or-equal-to operator.
-			[[nodiscard]] friend bool operator >= (value_arg_t lhs, const value& rhs) noexcept { return lhs >= rhs.val_; }
+			[[nodiscard]] friend bool operator >= (value_arg lhs, const value& rhs) noexcept { return lhs >= rhs.val_; }
 
 			/// \brief	Equality operator.
 			///

toml.hpp

@@ -293,17 +293,6 @@
 		__VA_ARGS__ [[nodiscard]] friend bool operator != (RHS rhs, LHS lhs) noexcept { return !(lhs == rhs); }
 #endif
 
-#if !TOML_DOXYGEN
-	#if TOML_EXCEPTIONS
-		#define TOML_START	namespace toml { inline namespace wex
-	#else
-		#define TOML_START	namespace toml { inline namespace woex
-	#endif
-	#define TOML_END			}
-#endif
-#define TOML_IMPL_START			TOML_START { namespace impl
-#define TOML_IMPL_END			} TOML_END
-
 #define TOML_LIB_MAJOR		0
 #define TOML_LIB_MINOR		2
 #define TOML_LIB_PATCH		0
@@ -332,6 +321,23 @@
 #define TOML_LANG_EXACTLY(maj, min, rev)											\
 		(TOML_LANG_EFFECTIVE_VERSION == TOML_MAKE_VERSION(maj, min, rev))
 
+#if !TOML_DOXYGEN
+
+	#if TOML_EXCEPTIONS
+		#define TOML_INLINE_NS_EX
+	#else
+		#define TOML_INLINE_NS_EX _noex
+	#endif
+
+	#define TOML_START_2(VER, ARG1, ARG2)	namespace toml { inline namespace v##VER##ARG1##ARG2
+	#define TOML_START_1(VER, ARG1, ARG2)	TOML_START_2(VER, ARG1, ARG2)
+	#define TOML_START		TOML_START_1(TOML_LIB_MAJOR,TOML_INLINE_NS_EX,)
+	#define TOML_END		}
+
+#endif
+#define TOML_IMPL_START		TOML_START { namespace impl
+#define TOML_IMPL_END		} TOML_END
+
 TOML_PUSH_WARNINGS
 TOML_DISABLE_ALL_WARNINGS
 
@@ -1680,6 +1686,11 @@ TOML_START
 		public:
 
 			using value_type = T;
+			using value_arg = std::conditional_t<
+				std::is_same_v<T, string>,
+				string_view,
+				std::conditional_t<impl::is_one_of<T, double, int64_t, bool>, T, const T&>
+			>;
 
 			template <typename... U>
 			TOML_NODISCARD_CTOR
@@ -1757,13 +1768,7 @@ TOML_START
 				return lhs;
 			}
 
-			using value_arg_t = std::conditional_t<
-				std::is_same_v<T, string>,
-				string_view,
-				std::conditional_t<impl::is_one_of<T, double, int64_t, bool>, T, const T&>
-			>;
-
-			value& operator= (value_arg_t rhs) noexcept
+			value& operator= (value_arg rhs) noexcept
 			{
 				if constexpr (std::is_same_v<T, string>)
 					val_.assign(rhs);
@@ -1779,16 +1784,16 @@ TOML_START
 				return *this;
 			}
 
-			[[nodiscard]] friend bool operator == (const value& lhs, value_arg_t rhs) noexcept { return lhs.val_ == rhs; }
-			TOML_ASYMMETRICAL_EQUALITY_OPS(const value&, value_arg_t, )
-			[[nodiscard]] friend bool operator <  (const value& lhs, value_arg_t rhs) noexcept { return lhs.val_ < rhs; }
-			[[nodiscard]] friend bool operator <  (value_arg_t lhs, const value& rhs) noexcept { return lhs < rhs.val_; }
-			[[nodiscard]] friend bool operator <= (const value& lhs, value_arg_t rhs) noexcept { return lhs.val_ <= rhs; }
-			[[nodiscard]] friend bool operator <= (value_arg_t lhs, const value& rhs) noexcept { return lhs <= rhs.val_; }
-			[[nodiscard]] friend bool operator >  (const value& lhs, value_arg_t rhs) noexcept { return lhs.val_ > rhs; }
-			[[nodiscard]] friend bool operator >  (value_arg_t lhs, const value& rhs) noexcept { return lhs > rhs.val_; }
-			[[nodiscard]] friend bool operator >= (const value& lhs, value_arg_t rhs) noexcept { return lhs.val_ >= rhs; }
-			[[nodiscard]] friend bool operator >= (value_arg_t lhs, const value& rhs) noexcept { return lhs >= rhs.val_; }
+			[[nodiscard]] friend bool operator == (const value& lhs, value_arg rhs) noexcept { return lhs.val_ == rhs; }
+			TOML_ASYMMETRICAL_EQUALITY_OPS(const value&, value_arg, )
+			[[nodiscard]] friend bool operator <  (const value& lhs, value_arg rhs) noexcept { return lhs.val_ < rhs; }
+			[[nodiscard]] friend bool operator <  (value_arg lhs, const value& rhs) noexcept { return lhs < rhs.val_; }
+			[[nodiscard]] friend bool operator <= (const value& lhs, value_arg rhs) noexcept { return lhs.val_ <= rhs; }
+			[[nodiscard]] friend bool operator <= (value_arg lhs, const value& rhs) noexcept { return lhs <= rhs.val_; }
+			[[nodiscard]] friend bool operator >  (const value& lhs, value_arg rhs) noexcept { return lhs.val_ > rhs; }
+			[[nodiscard]] friend bool operator >  (value_arg lhs, const value& rhs) noexcept { return lhs > rhs.val_; }
+			[[nodiscard]] friend bool operator >= (const value& lhs, value_arg rhs) noexcept { return lhs.val_ >= rhs; }
+			[[nodiscard]] friend bool operator >= (value_arg lhs, const value& rhs) noexcept { return lhs >= rhs.val_; }
 
 			template <typename U>
 			[[nodiscard]] friend bool operator == (const value& lhs, const value<U>& rhs) noexcept
@@ -8562,7 +8567,10 @@ TOML_END
 	#undef TOML_DOXYGEN
 	#undef TOML_RELOPS_REORDERING
 	#undef TOML_ASYMMETRICAL_EQUALITY_OPS
+	#undef TOML_INLINE_NS_EX
 	#undef TOML_START
+	#undef TOML_START_2
+	#undef TOML_START_1
 	#undef TOML_END
 	#undef TOML_IMPL_START
 	#undef TOML_IMPL_END