Added thirdparty: boost library

thirdparty/include/boost/json/detail/charconv/from_chars.hpp

@@ -0,0 +1,33 @@
+// Copyright 2022 Peter Dimov
+// Copyright 2023 Matt Borland
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#ifndef BOOST_JSON_DETAIL_CHARCONV_FROM_CHARS_HPP_INCLUDED
+#define BOOST_JSON_DETAIL_CHARCONV_FROM_CHARS_HPP_INCLUDED
+
+#include <boost/json/detail/charconv/detail/config.hpp>
+#include <boost/json/detail/charconv/detail/from_chars_result.hpp>
+#include <boost/json/detail/charconv/chars_format.hpp>
+#include <system_error>
+
+namespace boost { namespace json { namespace detail { namespace charconv {
+
+//----------------------------------------------------------------------------------------------------------------------
+// Floating Point
+//----------------------------------------------------------------------------------------------------------------------
+
+namespace detail {
+
+std::errc errno_to_errc(int errno_value) noexcept;
+
+} // Namespace detail
+
+BOOST_JSON_DECL from_chars_result from_chars(const char* first, const char* last, double& value, chars_format fmt = chars_format::general) noexcept;
+
+} // namespace charconv
+} // namespace detail
+} // namespace json
+} // namespace boost
+
+#endif // #ifndef BOOST_JSON_DETAIL_CHARCONV_FROM_CHARS_HPP_INCLUDED