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117 lines
2.5 KiB
C++
117 lines
2.5 KiB
C++
// Copyright 2021, 2022 Peter Dimov.
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// Distributed under the Boost Software License, Version 1.0.
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// http://www.boost.org/LICENSE_1_0.txt
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#include <boost/system/error_code.hpp>
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#include <boost/system/error_category.hpp>
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#include <boost/system/errc.hpp>
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#include <boost/core/lightweight_test.hpp>
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#include <boost/config.hpp>
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#include <cerrno>
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#include <system_error>
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enum my_errc
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{
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my_enoent = ENOENT
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};
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class my_category: public boost::system::error_category
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{
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public:
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char const* name() const noexcept
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{
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return "mycat";
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}
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boost::system::error_condition default_error_condition( int ev ) const noexcept
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{
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switch( ev )
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{
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case my_enoent:
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return boost::system::error_condition( ENOENT, boost::system::generic_category() );
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default:
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return boost::system::error_condition( ev, *this );
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}
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}
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std::string message( int ev ) const
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{
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switch( ev )
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{
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case my_enoent:
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return "No such entity";
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default:
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return "Unknown error";
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}
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}
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};
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#if defined(BOOST_GCC) && BOOST_GCC < 70000
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// g++ 6 and earlier do not allow specializations outside the namespace
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namespace boost
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{
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namespace system
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{
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template<> struct is_error_code_enum<my_errc>: std::true_type {};
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} // namespace system
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} // namespace boost
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namespace std
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{
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template<> struct is_error_code_enum<my_errc>: std::true_type {};
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} // namespace std
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#else
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template<> struct boost::system::is_error_code_enum<my_errc>: std::true_type {};
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template<> struct std::is_error_code_enum<my_errc>: std::true_type {};
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#endif
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boost::system::error_code make_error_code( my_errc e )
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{
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// If `cat` is declared constexpr or const, msvc-14.1 and
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// msvc-14.2 before 19.29 put it in read-only memory,
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// despite the `ps_` member being mutable. So it crashes.
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static /*BOOST_SYSTEM_CONSTEXPR*/ my_category cat;
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return boost::system::error_code( e, cat );
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}
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int main()
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{
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{
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boost::system::error_code e1 = my_enoent;
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BOOST_TEST( e1 == my_enoent );
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BOOST_TEST_NOT( e1 != my_enoent );
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BOOST_TEST( e1 == boost::system::errc::no_such_file_or_directory );
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BOOST_TEST( e1 == std::errc::no_such_file_or_directory );
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}
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{
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std::error_code e1 = my_enoent;
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BOOST_TEST( e1 == my_enoent );
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BOOST_TEST_NOT( e1 != my_enoent );
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BOOST_TEST( e1 == std::errc::no_such_file_or_directory );
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}
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return boost::report_errors();
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}
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