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uerror.h
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uerror.h
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// This file is part of the uSTL library, an STL implementation.
//
// Copyright (c) 2005 by Mike Sharov <[email protected]>
// This file is free software, distributed under the MIT License.
#pragma once
#if HAVE_CPP14
#include "uttraits.h"
//----------------------------------------------------------------------
namespace ustl {
class error_code;
class error_condition;
template <typename T> struct is_error_code_enum : public false_type { };
template <typename T> struct is_error_condition_enum : public false_type {};
//{{{ errc enum of error codes for error_code and error_condition ------
enum class errc {
address_family_not_supported = EAFNOSUPPORT,
address_in_use = EADDRINUSE,
address_not_available = EADDRNOTAVAIL,
already_connected = EISCONN,
argument_list_too_long = E2BIG,
argument_out_of_domain = EDOM,
bad_address = EFAULT,
bad_file_descriptor = EBADF,
bad_message = EBADMSG,
broken_pipe = EPIPE,
connection_aborted = ECONNABORTED,
connection_already_in_progress = EALREADY,
connection_refused = ECONNREFUSED,
connection_reset = ECONNRESET,
cross_device_link = EXDEV,
destination_address_required = EDESTADDRREQ,
device_or_resource_busy = EBUSY,
directory_not_empty = ENOTEMPTY,
executable_format_error = ENOEXEC,
file_exists = EEXIST,
file_too_large = EFBIG,
filename_too_long = ENAMETOOLONG,
function_not_supported = ENOSYS,
host_unreachable = EHOSTUNREACH,
identifier_removed = EIDRM,
illegal_byte_sequence = EILSEQ,
inappropriate_io_control_operation = ENOTTY,
interrupted = EINTR,
invalid_argument = EINVAL,
invalid_seek = ESPIPE,
io_error = EIO,
is_a_directory = EISDIR,
message_size = EMSGSIZE,
network_down = ENETDOWN,
network_reset = ENETRESET,
network_unreachable = ENETUNREACH,
no_buffer_space = ENOBUFS,
no_child_process = ECHILD,
no_link = ENOLINK,
no_lock_available = ENOLCK,
no_message_available = ENODATA,
no_message = ENOMSG,
no_protocol_option = ENOPROTOOPT,
no_space_on_device = ENOSPC,
no_stream_resources = ENOSR,
no_such_device_or_address = ENXIO,
no_such_device = ENODEV,
no_such_file_or_directory = ENOENT,
no_such_process = ESRCH,
not_a_directory = ENOTDIR,
not_a_socket = ENOTSOCK,
not_a_stream = ENOSTR,
not_connected = ENOTCONN,
not_enough_memory = ENOMEM,
not_supported = EINVAL,
operation_canceled = ECANCELED,
operation_in_progress = EINPROGRESS,
operation_not_permitted = EPERM,
operation_not_supported = EOPNOTSUPP,
operation_would_block = EAGAIN,
owner_dead = EOWNERDEAD,
permission_denied = EACCES,
protocol_error = EPROTO,
protocol_not_supported = EPROTONOSUPPORT,
read_only_file_system = EROFS,
resource_deadlock_would_occur = EDEADLK,
resource_unavailable_try_again = EAGAIN,
result_out_of_range = ERANGE,
state_not_recoverable = ENOTRECOVERABLE,
stream_timeout = ETIME,
text_file_busy = ETXTBSY,
timed_out = ETIMEDOUT,
too_many_files_open_in_system = ENFILE,
too_many_files_open = EMFILE,
too_many_links = EMLINK,
too_many_symbolic_link_levels = ELOOP,
value_too_large = EOVERFLOW,
wrong_protocol_type = EPROTOTYPE
};
template<> struct is_error_code_enum<errc> : public true_type {};
template<> struct is_error_condition_enum<errc> : public true_type {};
error_code make_error_code (errc) noexcept;
error_condition make_error_condition (errc) noexcept;
//}}}-------------------------------------------------------------------
//{{{ error_category
class error_category {
public:
constexpr error_category (void) noexcept = default;
error_category& operator= (const error_category&) = delete;
inline constexpr auto name (void) const { return "system"; }
inline auto message (int ec) const { return strerror(ec); }
inline error_condition default_error_condition (int ec) const noexcept;
inline constexpr bool equivalent (int ec, const error_condition& cond) const noexcept;
inline constexpr bool equivalent (const error_code& ec, int c) const noexcept;
inline constexpr bool operator== (const error_category&) const { return true; }
inline constexpr bool operator!= (const error_category&) const { return false; }
};
inline constexpr auto system_category (void) { return error_category(); }
inline constexpr auto generic_category (void) { return error_category(); }
//}}}-------------------------------------------------------------------
//{{{ error_code
class error_code {
public:
inline constexpr error_code (void) : _ec(0) { }
inline constexpr error_code (int ec, const error_category&) : _ec(ec) {}
template <typename ErrorCodeEnum,
typename = typename enable_if<is_error_code_enum<ErrorCodeEnum>::value>::type>
inline constexpr error_code (ErrorCodeEnum e) : error_code (make_error_code(e)) {}
inline void assign (int ec, const error_category&) noexcept { _ec = ec; }
template <typename ErrorCodeEnum>
inline typename enable_if<is_error_code_enum<ErrorCodeEnum>::value, error_code&>::type
operator= (ErrorCodeEnum e) { return *this = make_error_code(e); }
inline void clear (void) { assign (0, system_category()); }
inline constexpr auto value (void) const { return _ec; }
inline constexpr auto category (void) const { return system_category(); }
inline error_condition default_error_condition (void) const noexcept;
inline auto message (void) const { return category().message (value()); }
inline constexpr explicit operator bool (void) const { return _ec; }
inline void read (istream& is);
inline void write (ostream& os) const;
inline constexpr bool operator== (const error_code& v) const { return category() == v.category() && value() == v.value(); }
inline constexpr bool operator== (const error_condition& v) const noexcept;
private:
int _ec;
};
inline error_code make_error_code (errc e) noexcept
{ return error_code (static_cast<int>(e), system_category()); }
//}}}-------------------------------------------------------------------
//{{{ error_condition
class error_condition {
public:
inline constexpr error_condition (void) : _ec(0) { }
inline constexpr error_condition (int ec, const error_category&) : _ec(ec) {}
template <typename ErrorConditionEnum,
typename = typename enable_if<is_error_condition_enum<ErrorConditionEnum>::value>::type>
inline constexpr error_condition (ErrorConditionEnum e) : error_condition (make_error_condition(e)) {}
inline void assign (int ec, const error_category&) noexcept { _ec = ec; }
template <typename ErrorConditionEnum>
inline typename enable_if<is_error_condition_enum<ErrorConditionEnum>::value, error_condition&>::type
operator=(ErrorConditionEnum e) { return *this = make_error_condition(e); }
inline void clear (void) { assign (0, generic_category()); }
inline constexpr auto value (void) const { return _ec; }
inline constexpr auto category (void) const { return generic_category(); }
inline auto message (void) const { return category().message (value()); }
inline constexpr explicit operator bool (void) const { return value(); }
inline void read (istream& is);
inline void write (ostream& os) const;
inline constexpr bool operator== (const error_condition& v) const
{ return category() == v.category() && value() == v.value(); }
inline constexpr bool operator== (const error_code& v) const
{ return category() == v.category() && value() == v.value(); }
private:
int _ec;
};
inline error_condition make_error_condition (errc e) noexcept
{ return error_condition (static_cast<int>(e), generic_category()); }
error_condition error_category::default_error_condition (int ec) const noexcept
{ return error_condition (ec, *this); }
constexpr bool error_category::equivalent (int ec, const error_condition& cond) const noexcept
{ return *this == cond.category() && ec == cond.value(); }
constexpr bool error_category::equivalent (const error_code& ec, int c) const noexcept
{ return *this == ec.category() && c == ec.value(); }
error_condition error_code::default_error_condition (void) const noexcept
{ return error_condition (value(), category()); }
constexpr bool error_code::operator== (const error_condition& v) const noexcept
{ return category() == v.category() && value() == v.value(); }
//}}}-------------------------------------------------------------------
} // namespace ustl
#endif // HAVE_CPP14