libcxx/include/__system_error/system_error.h

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___SYSTEM_ERROR_SYSTEM_ERROR_H
#define _LIBCPP___SYSTEM_ERROR_SYSTEM_ERROR_H

#include <__config>
#include <__system_error/error_category.h>
#include <__system_error/error_code.h>
#include <__verbose_abort>
#include <stdexcept>
#include <string>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD
_LIBCPP_BEGIN_EXPLICIT_ABI_ANNOTATIONS

class _LIBCPP_EXPORTED_FROM_ABI system_error : public runtime_error {
  error_code __ec_;

public:
  system_error(error_code __ec, const string& __what_arg);
  system_error(error_code __ec, const char* __what_arg);
  system_error(error_code __ec);
  system_error(int __ev, const error_category& __ecat, const string& __what_arg);
  system_error(int __ev, const error_category& __ecat, const char* __what_arg);
  system_error(int __ev, const error_category& __ecat);
  _LIBCPP_HIDE_FROM_ABI system_error(const system_error&) _NOEXCEPT = default;
  ~system_error() _NOEXCEPT override;

  [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI const error_code& code() const _NOEXCEPT { return __ec_; }
};

// __ev is expected to be an error in the generic_category domain (e.g. from
// errno, or std::errc::*), not system_category (e.g. from windows syscalls).
[[__noreturn__]] _LIBCPP_EXPORTED_FROM_ABI void __throw_system_error(int __ev, const char* __what_arg);

[[__noreturn__]] _LIBCPP_HIDE_FROM_ABI inline void __throw_system_error(error_code __ec, const char* __what_arg) {
#if _LIBCPP_HAS_EXCEPTIONS
  throw system_error(__ec, __what_arg);
#else
  _LIBCPP_VERBOSE_ABORT(
      "system_error was thrown in -fno-exceptions mode with error %i and message \"%s\"", __ec.value(), __what_arg);
#endif
}

_LIBCPP_END_EXPLICIT_ABI_ANNOTATIONS
_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___SYSTEM_ERROR_SYSTEM_ERROR_H