| 1 | // Copyright 2021, 2022 Peter Dimov. |
|---|---|
| 2 | // Distributed under the Boost Software License, Version 1.0. |
| 3 | // http://www.boost.org/LICENSE_1_0.txt |
| 4 | |
| 5 | #include <boost/system/error_code.hpp> |
| 6 | #include <boost/system/error_category.hpp> |
| 7 | #include <boost/system/errc.hpp> |
| 8 | #include <boost/core/lightweight_test.hpp> |
| 9 | #include <boost/config.hpp> |
| 10 | #include <cerrno> |
| 11 | #include <system_error> |
| 12 | |
| 13 | enum my_errc |
| 14 | { |
| 15 | my_enoent = ENOENT |
| 16 | }; |
| 17 | |
| 18 | class my_category: public boost::system::error_category |
| 19 | { |
| 20 | public: |
| 21 | |
| 22 | char const* name() const noexcept |
| 23 | { |
| 24 | return "mycat"; |
| 25 | } |
| 26 | |
| 27 | boost::system::error_condition default_error_condition( int ev ) const noexcept |
| 28 | { |
| 29 | switch( ev ) |
| 30 | { |
| 31 | case my_enoent: |
| 32 | |
| 33 | return boost::system::error_condition( ENOENT, boost::system::generic_category() ); |
| 34 | |
| 35 | default: |
| 36 | |
| 37 | return boost::system::error_condition( ev, *this ); |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | std::string message( int ev ) const |
| 42 | { |
| 43 | switch( ev ) |
| 44 | { |
| 45 | case my_enoent: |
| 46 | |
| 47 | return "No such entity"; |
| 48 | |
| 49 | default: |
| 50 | |
| 51 | return "Unknown error"; |
| 52 | } |
| 53 | } |
| 54 | }; |
| 55 | |
| 56 | #if defined(BOOST_GCC) && BOOST_GCC < 70000 |
| 57 | |
| 58 | // g++ 6 and earlier do not allow specializations outside the namespace |
| 59 | |
| 60 | namespace boost |
| 61 | { |
| 62 | namespace system |
| 63 | { |
| 64 | |
| 65 | template<> struct is_error_code_enum<my_errc>: std::true_type {}; |
| 66 | |
| 67 | } // namespace system |
| 68 | } // namespace boost |
| 69 | |
| 70 | namespace std |
| 71 | { |
| 72 | |
| 73 | template<> struct is_error_code_enum<my_errc>: std::true_type {}; |
| 74 | |
| 75 | } // namespace std |
| 76 | |
| 77 | #else |
| 78 | |
| 79 | template<> struct boost::system::is_error_code_enum<my_errc>: std::true_type {}; |
| 80 | template<> struct std::is_error_code_enum<my_errc>: std::true_type {}; |
| 81 | |
| 82 | #endif |
| 83 | |
| 84 | boost::system::error_code make_error_code( my_errc e ) |
| 85 | { |
| 86 | // If `cat` is declared constexpr or const, msvc-14.1 and |
| 87 | // msvc-14.2 before 19.29 put it in read-only memory, |
| 88 | // despite the `ps_` member being mutable. So it crashes. |
| 89 | |
| 90 | static /*BOOST_SYSTEM_CONSTEXPR*/ my_category cat; |
| 91 | return boost::system::error_code( e, cat ); |
| 92 | } |
| 93 | |
| 94 | int main() |
| 95 | { |
| 96 | { |
| 97 | boost::system::error_code e1 = my_enoent; |
| 98 | |
| 99 | BOOST_TEST( e1 == my_enoent ); |
| 100 | BOOST_TEST_NOT( e1 != my_enoent ); |
| 101 | |
| 102 | BOOST_TEST( e1 == boost::system::errc::no_such_file_or_directory ); |
| 103 | BOOST_TEST( e1 == std::errc::no_such_file_or_directory ); |
| 104 | } |
| 105 | |
| 106 | { |
| 107 | std::error_code e1 = my_enoent; |
| 108 | |
| 109 | BOOST_TEST( e1 == my_enoent ); |
| 110 | BOOST_TEST_NOT( e1 != my_enoent ); |
| 111 | |
| 112 | BOOST_TEST( e1 == std::errc::no_such_file_or_directory ); |
| 113 | } |
| 114 | |
| 115 | return boost::report_errors(); |
| 116 | } |
| 117 |