json/impl/error.hpp

0001 //
0002 // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
0003 //
0004 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0005 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0006 //
0007 // Official repository: https://github.com/boostorg/json
0008 //
0009
0010 #ifndef BOOST_JSON_IMPL_ERROR_HPP
0011 #define BOOST_JSON_IMPL_ERROR_HPP
0012
0013 #include <type_traits>
0014
0015 namespace boost {
0016 namespace system {
0017 template<>
0018 struct is_error_code_enum< ::boost::json::error >
0019 {
0020     static bool const value = true;
0021 };
0022 template<>
0023 struct is_error_condition_enum< ::boost::json::condition >
0024 {
0025     static bool const value = true;
0026 };
0027 } // system
0028 } // boost
0029
0030 namespace std {
0031 template<>
0032 struct is_error_code_enum< ::boost::json::error >
0033 {
0034     static bool const value = true;
0035 };
0036 template<>
0037 struct is_error_condition_enum< ::boost::json::condition >
0038 {
0039     static bool const value = true;
0040 };
0041 } // std
0042
0043 namespace boost {
0044 namespace json {
0045 namespace detail {
0046
0047 struct error_code_category_t
0048     : error_category
0049 {
0050     constexpr
0051     error_code_category_t()
0052         : error_category(0xB9A9B9922177C772)
0053     {}
0054
0055     BOOST_JSON_DECL
0056     const char*
0057     name() const noexcept override;
0058
0059     BOOST_JSON_DECL
0060     char const*
0061     message( int ev, char* buf, std::size_t len ) const noexcept override;
0062
0063     BOOST_JSON_DECL
0064     std::string
0065     message( int ev ) const override;
0066
0067     BOOST_JSON_DECL
0068     error_condition
0069     default_error_condition( int ev ) const noexcept override;
0070 };
0071
0072 extern
0073 BOOST_JSON_DECL
0074 error_code_category_t error_code_category;
0075
0076 struct error_condition_category_t
0077     : error_category
0078 {
0079     constexpr
0080     error_condition_category_t()
0081         : error_category(0x37CEF5A036D24FD1)
0082     {}
0083
0084     BOOST_JSON_DECL
0085     const char*
0086     name() const noexcept override;
0087
0088     BOOST_JSON_DECL
0089     char const*
0090     message( int ev, char*, std::size_t ) const noexcept override;
0091
0092     BOOST_JSON_DECL
0093     std::string
0094     message( int cv ) const override;
0095 };
0096
0097 extern
0098 BOOST_JSON_DECL
0099 error_condition_category_t error_condition_category;
0100
0101 } // namespace detail
0102
0103 inline
0104 BOOST_SYSTEM_CONSTEXPR
0105 error_code
0106 make_error_code(error e) noexcept
0107 {
0108
0109     return error_code(
0110         static_cast<std::underlying_type<error>::type>(e),
0111         detail::error_code_category );
0112 }
0113
0114 inline
0115 BOOST_SYSTEM_CONSTEXPR
0116 error_condition
0117 make_error_condition(condition c) noexcept
0118 {
0119     return error_condition(
0120         static_cast<std::underlying_type<condition>::type>(c),
0121         detail::error_condition_category );
0122 }
0123
0124 } // namespace json
0125 } // namespace boost
0126
0127 #endif