521 lines
19 KiB
Plaintext
521 lines
19 KiB
Plaintext
// boost/system/error_code.hpp ---------------------------------------------//
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// Copyright Beman Dawes 2006, 2007
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// Copyright Christoper Kohlhoff 2007
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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// See library home page at http://www.boost.org/libs/system
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#ifndef BOOST_ERROR_CODE_HPP
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#define BOOST_ERROR_CODE_HPP
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#include <boost/system/config.hpp>
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#include <boost/cstdint.hpp>
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#include <boost/assert.hpp>
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#include <boost/noncopyable.hpp>
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#include <boost/utility/enable_if.hpp>
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#include <ostream>
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#include <string>
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#include <stdexcept>
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#include <functional>
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// TODO: undef these macros if not already defined
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#include <boost/cerrno.hpp>
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#if !defined(BOOST_POSIX_API) && !defined(BOOST_WINDOWS_API)
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# error BOOST_POSIX_API or BOOST_WINDOWS_API must be defined
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#endif
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#include <boost/config/abi_prefix.hpp> // must be the last #include
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#ifndef BOOST_SYSTEM_NOEXCEPT
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#define BOOST_SYSTEM_NOEXCEPT BOOST_NOEXCEPT
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#endif
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namespace boost
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{
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namespace system
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{
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class error_code;
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class error_condition;
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// "Concept" helpers ---------------------------------------------------//
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template< class T >
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struct is_error_code_enum { static const bool value = false; };
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template< class T >
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struct is_error_condition_enum { static const bool value = false; };
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// generic error_conditions --------------------------------------------//
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namespace errc
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{
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enum errc_t
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{
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success = 0,
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address_family_not_supported = EAFNOSUPPORT,
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address_in_use = EADDRINUSE,
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address_not_available = EADDRNOTAVAIL,
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already_connected = EISCONN,
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argument_list_too_long = E2BIG,
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argument_out_of_domain = EDOM,
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bad_address = EFAULT,
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bad_file_descriptor = EBADF,
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bad_message = EBADMSG,
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broken_pipe = EPIPE,
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connection_aborted = ECONNABORTED,
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connection_already_in_progress = EALREADY,
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connection_refused = ECONNREFUSED,
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connection_reset = ECONNRESET,
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cross_device_link = EXDEV,
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destination_address_required = EDESTADDRREQ,
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device_or_resource_busy = EBUSY,
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directory_not_empty = ENOTEMPTY,
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executable_format_error = ENOEXEC,
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file_exists = EEXIST,
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file_too_large = EFBIG,
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filename_too_long = ENAMETOOLONG,
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function_not_supported = ENOSYS,
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host_unreachable = EHOSTUNREACH,
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identifier_removed = EIDRM,
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illegal_byte_sequence = EILSEQ,
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inappropriate_io_control_operation = ENOTTY,
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interrupted = EINTR,
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invalid_argument = EINVAL,
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invalid_seek = ESPIPE,
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io_error = EIO,
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is_a_directory = EISDIR,
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message_size = EMSGSIZE,
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network_down = ENETDOWN,
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network_reset = ENETRESET,
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network_unreachable = ENETUNREACH,
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no_buffer_space = ENOBUFS,
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no_child_process = ECHILD,
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no_link = ENOLINK,
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no_lock_available = ENOLCK,
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no_message_available = ENODATA,
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no_message = ENOMSG,
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no_protocol_option = ENOPROTOOPT,
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no_space_on_device = ENOSPC,
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no_stream_resources = ENOSR,
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no_such_device_or_address = ENXIO,
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no_such_device = ENODEV,
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no_such_file_or_directory = ENOENT,
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no_such_process = ESRCH,
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not_a_directory = ENOTDIR,
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not_a_socket = ENOTSOCK,
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not_a_stream = ENOSTR,
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not_connected = ENOTCONN,
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not_enough_memory = ENOMEM,
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not_supported = ENOTSUP,
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operation_canceled = ECANCELED,
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operation_in_progress = EINPROGRESS,
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operation_not_permitted = EPERM,
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operation_not_supported = EOPNOTSUPP,
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operation_would_block = EWOULDBLOCK,
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owner_dead = EOWNERDEAD,
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permission_denied = EACCES,
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protocol_error = EPROTO,
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protocol_not_supported = EPROTONOSUPPORT,
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read_only_file_system = EROFS,
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resource_deadlock_would_occur = EDEADLK,
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resource_unavailable_try_again = EAGAIN,
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result_out_of_range = ERANGE,
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state_not_recoverable = ENOTRECOVERABLE,
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stream_timeout = ETIME,
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text_file_busy = ETXTBSY,
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timed_out = ETIMEDOUT,
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too_many_files_open_in_system = ENFILE,
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too_many_files_open = EMFILE,
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too_many_links = EMLINK,
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too_many_symbolic_link_levels = ELOOP,
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value_too_large = EOVERFLOW,
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wrong_protocol_type = EPROTOTYPE
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};
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} // namespace errc
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# ifndef BOOST_SYSTEM_NO_DEPRECATED
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namespace posix = errc;
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namespace posix_error = errc;
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# endif
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template<> struct is_error_condition_enum<errc::errc_t>
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{ static const bool value = true; };
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// ----------------------------------------------------------------------//
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// Operating system specific interfaces --------------------------------//
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// The interface is divided into general and system-specific portions to
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// meet these requirements:
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//
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// * Code calling an operating system API can create an error_code with
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// a single category (system_category), even for POSIX-like operating
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// systems that return some POSIX errno values and some native errno
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// values. This code should not have to pay the cost of distinguishing
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// between categories, since it is not yet known if that is needed.
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//
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// * Users wishing to write system-specific code should be given enums for
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// at least the common error cases.
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//
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// * System specific code should fail at compile time if moved to another
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// operating system.
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// The system specific portions of the interface are located in headers
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// with names reflecting the operating system. For example,
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//
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// <boost/system/cygwin_error.hpp>
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// <boost/system/linux_error.hpp>
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// <boost/system/windows_error.hpp>
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//
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// These headers are effectively empty for compiles on operating systems
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// where they are not applicable.
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// ----------------------------------------------------------------------//
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// class error_category ------------------------------------------------//
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class error_category : public noncopyable
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{
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public:
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virtual ~error_category(){}
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virtual const char * name() const BOOST_SYSTEM_NOEXCEPT = 0;
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virtual std::string message( int ev ) const = 0;
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inline virtual error_condition default_error_condition( int ev ) const BOOST_SYSTEM_NOEXCEPT;
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inline virtual bool equivalent( int code,
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const error_condition & condition ) const BOOST_SYSTEM_NOEXCEPT;
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inline virtual bool equivalent( const error_code & code,
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int condition ) const BOOST_SYSTEM_NOEXCEPT;
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bool operator==(const error_category & rhs) const BOOST_SYSTEM_NOEXCEPT { return this == &rhs; }
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bool operator!=(const error_category & rhs) const BOOST_SYSTEM_NOEXCEPT { return this != &rhs; }
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bool operator<( const error_category & rhs ) const BOOST_SYSTEM_NOEXCEPT
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{
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return std::less<const error_category*>()( this, &rhs );
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}
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};
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// predefined error categories -----------------------------------------//
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# ifdef BOOST_ERROR_CODE_HEADER_ONLY
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inline const error_category & system_category() BOOST_SYSTEM_NOEXCEPT;
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inline const error_category & generic_category() BOOST_SYSTEM_NOEXCEPT;
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#else
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BOOST_SYSTEM_DECL const error_category & system_category() BOOST_SYSTEM_NOEXCEPT;
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BOOST_SYSTEM_DECL const error_category & generic_category() BOOST_SYSTEM_NOEXCEPT;
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#endif
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// deprecated synonyms --------------------------------------------------//
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# ifndef BOOST_SYSTEM_NO_DEPRECATED
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inline const error_category & get_system_category() { return system_category(); }
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inline const error_category & get_generic_category() { return generic_category(); }
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inline const error_category & get_posix_category() { return generic_category(); }
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static const error_category & posix_category = generic_category();
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static const error_category & errno_ecat = generic_category();
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static const error_category & native_ecat = system_category();
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# endif
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// class error_condition -----------------------------------------------//
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// error_conditions are portable, error_codes are system or library specific
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class error_condition
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{
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public:
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// constructors:
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error_condition() BOOST_SYSTEM_NOEXCEPT : m_val(0), m_cat(&generic_category()) {}
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error_condition( int val, const error_category & cat ) BOOST_SYSTEM_NOEXCEPT : m_val(val), m_cat(&cat) {}
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template <class ErrorConditionEnum>
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error_condition(ErrorConditionEnum e,
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typename boost::enable_if<is_error_condition_enum<ErrorConditionEnum> >::type* = 0) BOOST_SYSTEM_NOEXCEPT
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{
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*this = make_error_condition(e);
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}
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// modifiers:
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void assign( int val, const error_category & cat ) BOOST_SYSTEM_NOEXCEPT
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{
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m_val = val;
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m_cat = &cat;
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}
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template<typename ErrorConditionEnum>
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typename boost::enable_if<is_error_condition_enum<ErrorConditionEnum>, error_condition>::type &
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operator=( ErrorConditionEnum val ) BOOST_SYSTEM_NOEXCEPT
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{
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*this = make_error_condition(val);
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return *this;
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}
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void clear() BOOST_SYSTEM_NOEXCEPT
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{
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m_val = 0;
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m_cat = &generic_category();
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}
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// observers:
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int value() const BOOST_SYSTEM_NOEXCEPT { return m_val; }
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const error_category & category() const BOOST_SYSTEM_NOEXCEPT { return *m_cat; }
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std::string message() const { return m_cat->message(value()); }
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typedef void (*unspecified_bool_type)();
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static void unspecified_bool_true() {}
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operator unspecified_bool_type() const BOOST_SYSTEM_NOEXCEPT // true if error
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{
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return m_val == 0 ? 0 : unspecified_bool_true;
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}
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bool operator!() const BOOST_SYSTEM_NOEXCEPT // true if no error
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{
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return m_val == 0;
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}
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// relationals:
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// the more symmetrical non-member syntax allows enum
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// conversions work for both rhs and lhs.
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inline friend bool operator==( const error_condition & lhs,
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const error_condition & rhs ) BOOST_SYSTEM_NOEXCEPT
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{
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return lhs.m_cat == rhs.m_cat && lhs.m_val == rhs.m_val;
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}
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inline friend bool operator<( const error_condition & lhs,
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const error_condition & rhs ) BOOST_SYSTEM_NOEXCEPT
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// the more symmetrical non-member syntax allows enum
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// conversions work for both rhs and lhs.
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{
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return lhs.m_cat < rhs.m_cat
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|| (lhs.m_cat == rhs.m_cat && lhs.m_val < rhs.m_val);
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}
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private:
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int m_val;
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const error_category * m_cat;
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};
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// class error_code ----------------------------------------------------//
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// We want error_code to be a value type that can be copied without slicing
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// and without requiring heap allocation, but we also want it to have
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// polymorphic behavior based on the error category. This is achieved by
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// abstract base class error_category supplying the polymorphic behavior,
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// and error_code containing a pointer to an object of a type derived
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// from error_category.
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class error_code
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{
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public:
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// constructors:
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error_code() BOOST_SYSTEM_NOEXCEPT : m_val(0), m_cat(&system_category()) {}
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error_code( int val, const error_category & cat ) BOOST_SYSTEM_NOEXCEPT : m_val(val), m_cat(&cat) {}
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template <class ErrorCodeEnum>
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error_code(ErrorCodeEnum e,
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typename boost::enable_if<is_error_code_enum<ErrorCodeEnum> >::type* = 0) BOOST_SYSTEM_NOEXCEPT
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{
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*this = make_error_code(e);
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}
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// modifiers:
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void assign( int val, const error_category & cat ) BOOST_SYSTEM_NOEXCEPT
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{
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m_val = val;
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m_cat = &cat;
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}
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template<typename ErrorCodeEnum>
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typename boost::enable_if<is_error_code_enum<ErrorCodeEnum>, error_code>::type &
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operator=( ErrorCodeEnum val ) BOOST_SYSTEM_NOEXCEPT
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{
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*this = make_error_code(val);
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return *this;
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}
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void clear() BOOST_SYSTEM_NOEXCEPT
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{
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m_val = 0;
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m_cat = &system_category();
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}
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// observers:
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int value() const BOOST_SYSTEM_NOEXCEPT { return m_val; }
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const error_category & category() const BOOST_SYSTEM_NOEXCEPT { return *m_cat; }
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error_condition default_error_condition() const BOOST_SYSTEM_NOEXCEPT { return m_cat->default_error_condition(value()); }
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std::string message() const { return m_cat->message(value()); }
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typedef void (*unspecified_bool_type)();
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static void unspecified_bool_true() {}
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operator unspecified_bool_type() const BOOST_SYSTEM_NOEXCEPT // true if error
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{
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return m_val == 0 ? 0 : unspecified_bool_true;
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}
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bool operator!() const BOOST_SYSTEM_NOEXCEPT // true if no error
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{
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return m_val == 0;
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}
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// relationals:
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inline friend bool operator==( const error_code & lhs,
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const error_code & rhs ) BOOST_SYSTEM_NOEXCEPT
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// the more symmetrical non-member syntax allows enum
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// conversions work for both rhs and lhs.
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{
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return lhs.m_cat == rhs.m_cat && lhs.m_val == rhs.m_val;
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}
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inline friend bool operator<( const error_code & lhs,
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const error_code & rhs ) BOOST_SYSTEM_NOEXCEPT
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// the more symmetrical non-member syntax allows enum
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// conversions work for both rhs and lhs.
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{
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return lhs.m_cat < rhs.m_cat
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|| (lhs.m_cat == rhs.m_cat && lhs.m_val < rhs.m_val);
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}
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private:
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int m_val;
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const error_category * m_cat;
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};
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// predefined error_code object used as "throw on error" tag
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# ifndef BOOST_SYSTEM_NO_DEPRECATED
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BOOST_SYSTEM_DECL extern error_code throws;
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# endif
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// Moving from a "throws" object to a "throws" function without breaking
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// existing code is a bit of a problem. The workaround is to place the
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// "throws" function in namespace boost rather than namespace boost::system.
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} // namespace system
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namespace detail { inline system::error_code * throws() { return 0; } }
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// Misuse of the error_code object is turned into a noisy failure by
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// poisoning the reference. This particular implementation doesn't
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// produce warnings or errors from popular compilers, is very efficient
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// (as determined by inspecting generated code), and does not suffer
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// from order of initialization problems. In practice, it also seems
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// cause user function error handling implementation errors to be detected
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// very early in the development cycle.
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inline system::error_code & throws()
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{ return *detail::throws(); }
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namespace system
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{
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// non-member functions ------------------------------------------------//
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inline bool operator!=( const error_code & lhs,
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const error_code & rhs ) BOOST_SYSTEM_NOEXCEPT
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{
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return !(lhs == rhs);
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}
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inline bool operator!=( const error_condition & lhs,
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const error_condition & rhs ) BOOST_SYSTEM_NOEXCEPT
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{
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return !(lhs == rhs);
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}
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inline bool operator==( const error_code & code,
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const error_condition & condition ) BOOST_SYSTEM_NOEXCEPT
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{
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return code.category().equivalent( code.value(), condition )
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|| condition.category().equivalent( code, condition.value() );
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}
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inline bool operator!=( const error_code & lhs,
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const error_condition & rhs ) BOOST_SYSTEM_NOEXCEPT
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{
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return !(lhs == rhs);
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}
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inline bool operator==( const error_condition & condition,
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const error_code & code ) BOOST_SYSTEM_NOEXCEPT
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{
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return condition.category().equivalent( code, condition.value() )
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|| code.category().equivalent( code.value(), condition );
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}
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inline bool operator!=( const error_condition & lhs,
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const error_code & rhs ) BOOST_SYSTEM_NOEXCEPT
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{
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return !(lhs == rhs);
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}
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// TODO: both of these may move elsewhere, but the LWG hasn't spoken yet.
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template <class charT, class traits>
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inline std::basic_ostream<charT,traits>&
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operator<< (std::basic_ostream<charT,traits>& os, error_code ec)
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{
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os << ec.category().name() << ':' << ec.value();
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return os;
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}
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inline std::size_t hash_value( const error_code & ec )
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{
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return static_cast<std::size_t>(ec.value())
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+ reinterpret_cast<std::size_t>(&ec.category());
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}
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// make_* functions for errc::errc_t -----------------------------//
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namespace errc
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{
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// explicit conversion:
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inline error_code make_error_code( errc_t e ) BOOST_SYSTEM_NOEXCEPT
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{ return error_code( e, generic_category() ); }
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// implicit conversion:
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inline error_condition make_error_condition( errc_t e ) BOOST_SYSTEM_NOEXCEPT
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{ return error_condition( e, generic_category() ); }
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}
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// error_category default implementation -------------------------------//
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error_condition error_category::default_error_condition( int ev ) const BOOST_SYSTEM_NOEXCEPT
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{
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return error_condition( ev, *this );
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}
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bool error_category::equivalent( int code,
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const error_condition & condition ) const BOOST_SYSTEM_NOEXCEPT
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{
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return default_error_condition( code ) == condition;
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}
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bool error_category::equivalent( const error_code & code,
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int condition ) const BOOST_SYSTEM_NOEXCEPT
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{
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return *this == code.category() && code.value() == condition;
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}
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} // namespace system
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} // namespace boost
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#include <boost/config/abi_suffix.hpp> // pops abi_prefix.hpp pragmas
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# ifdef BOOST_ERROR_CODE_HEADER_ONLY
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# include <boost/system/detail/error_code.ipp>
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# endif
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#endif // BOOST_ERROR_CODE_HPP
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