feat: update codes to v4

include/toml11/version.hpp

@@ -0,0 +1,110 @@
+#ifndef TOML11_VERSION_HPP
+#define TOML11_VERSION_HPP
+
+#define TOML11_VERSION_MAJOR 4
+#define TOML11_VERSION_MINOR 0
+#define TOML11_VERSION_PATCH 0
+
+#ifndef __cplusplus
+#    error "__cplusplus is not defined"
+#endif
+
+// Since MSVC does not define `__cplusplus` correctly unless you pass
+// `/Zc:__cplusplus` when compiling, the workaround macros are added.
+//
+// The value of `__cplusplus` macro is defined in the C++ standard spec, but
+// MSVC ignores the value, maybe because of backward compatibility. Instead,
+// MSVC defines _MSVC_LANG that has the same value as __cplusplus defined in
+// the C++ standard. So we check if _MSVC_LANG is defined before using `__cplusplus`.
+//
+// FYI: https://docs.microsoft.com/en-us/cpp/build/reference/zc-cplusplus?view=msvc-170
+//      https://docs.microsoft.com/en-us/cpp/preprocessor/predefined-macros?view=msvc-170
+//
+
+#if defined(_MSVC_LANG) && defined(_MSC_VER) && 1910 <= _MSC_VER
+#  define TOML11_CPLUSPLUS_STANDARD_VERSION _MSVC_LANG
+#else
+#  define TOML11_CPLUSPLUS_STANDARD_VERSION __cplusplus
+#endif
+
+#if TOML11_CPLUSPLUS_STANDARD_VERSION < 201103L
+#    error "toml11 requires C++11 or later."
+#endif
+
+#if ! defined(__has_include)
+#  define __has_include(x) 0
+#endif
+
+#if ! defined(__has_cpp_attribute)
+#  define __has_cpp_attribute(x) 0
+#endif
+
+#if ! defined(__has_builtin)
+#  define __has_builtin(x) 0
+#endif
+
+// hard to remember
+
+#ifndef TOML11_CXX14_VALUE
+#define TOML11_CXX14_VALUE 201402L
+#endif//TOML11_CXX14_VALUE
+
+#ifndef TOML11_CXX17_VALUE
+#define TOML11_CXX17_VALUE 201703L
+#endif//TOML11_CXX17_VALUE
+
+#ifndef TOML11_CXX20_VALUE
+#define TOML11_CXX20_VALUE 202002L
+#endif//TOML11_CXX20_VALUE
+
+
+#if TOML11_CPLUSPLUS_STANDARD_VERSION >= TOML11_CXX17_VALUE
+#  if __has_include(<string_view>)
+#    define TOML11_HAS_STRING_VIEW 1
+#  endif
+#endif
+
+#ifndef TOML11_DISABLE_STD_FILESYSTEM
+#  if TOML11_CPLUSPLUS_STANDARD_VERSION >= TOML11_CXX17_VALUE
+#    if __has_include(<filesystem>)
+#      define TOML11_HAS_FILESYSTEM 1
+#    endif
+#  endif
+#endif
+
+#if defined(TOML11_COMPILE_SOURCES)
+#  define TOML11_INLINE
+#else
+#  define TOML11_INLINE inline
+#endif
+
+namespace toml
+{
+
+inline const char* license_notice() noexcept
+{
+    return R"(The MIT License (MIT)
+
+Copyright (c) 2017-now Toru Niina
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.)";
+}
+
+} // toml
+#endif // TOML11_VERSION_HPP