charconv/detail/from_chars_result.hpp

0001 // Copyright 2023 Matt Borland
0002 // Distributed under the Boost Software License, Version 1.0.
0003 // https://www.boost.org/LICENSE_1_0.txt
0004
0005 #ifndef BOOST_CHARCONV_DETAIL_FROM_CHARS_RESULT_HPP
0006 #define BOOST_CHARCONV_DETAIL_FROM_CHARS_RESULT_HPP
0007
0008 #include <system_error>
0009
0010 namespace boost { namespace charconv {
0011
0012 // 22.13.3, Primitive numerical input conversion
0013
0014 template <typename UC>
0015 struct from_chars_result_t
0016 {
0017     const UC* ptr;
0018
0019     // Values:
0020     // 0 = no error
0021     // EINVAL = invalid_argument
0022     // ERANGE = result_out_of_range
0023     std::errc ec;
0024
0025     friend constexpr bool operator==(const from_chars_result_t<UC>& lhs, const from_chars_result_t<UC>& rhs) noexcept
0026     {
0027         return lhs.ptr == rhs.ptr && lhs.ec == rhs.ec;
0028     }
0029
0030     friend constexpr bool operator!=(const from_chars_result_t<UC>& lhs, const from_chars_result_t<UC>& rhs) noexcept
0031     {
0032         return !(lhs == rhs); // NOLINT : Expression can not be simplified since this is the definition
0033     }
0034
0035     constexpr explicit operator bool() const noexcept { return ec == std::errc{}; }
0036 };
0037 using from_chars_result = from_chars_result_t<char>;
0038
0039 }} // Namespaces
0040
0041 #endif // BOOST_CHARCONV_DETAIL_FROM_CHARS_RESULT_HPP