ba87515fea
Currently, the library-internal feature test macros are only defined if the feature is not available, and always have the prefix `_LIBCPP_HAS_NO_`. This patch changes that, so that they are always defined and have the prefix `_LIBCPP_HAS_` instead. This changes the canonical use of these macros to `#if _LIBCPP_HAS_FEATURE`, which means that using an undefined macro (e.g. due to a missing include) is diagnosed now. While this is rather unlikely currently, a similar change in `<__configuration/availability.h>` caught a few bugs. This also improves readability, since it removes the double-negation of `#ifndef _LIBCPP_HAS_NO_FEATURE`. The current patch only touches the macros defined in `<__config>`. If people are happy with this approach, I'll make a follow-up PR to also change the macros defined in `<__config_site>`.
55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___SYSTEM_ERROR_SYSTEM_ERROR_H
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#define _LIBCPP___SYSTEM_ERROR_SYSTEM_ERROR_H
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#include <__config>
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#include <__system_error/error_category.h>
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#include <__system_error/error_code.h>
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#include <__verbose_abort>
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#include <stdexcept>
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#include <string>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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class _LIBCPP_EXPORTED_FROM_ABI system_error : public runtime_error {
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error_code __ec_;
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public:
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system_error(error_code __ec, const string& __what_arg);
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system_error(error_code __ec, const char* __what_arg);
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system_error(error_code __ec);
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system_error(int __ev, const error_category& __ecat, const string& __what_arg);
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system_error(int __ev, const error_category& __ecat, const char* __what_arg);
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system_error(int __ev, const error_category& __ecat);
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_LIBCPP_HIDE_FROM_ABI system_error(const system_error&) _NOEXCEPT = default;
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~system_error() _NOEXCEPT override;
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_LIBCPP_HIDE_FROM_ABI const error_code& code() const _NOEXCEPT { return __ec_; }
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};
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[[__noreturn__]] _LIBCPP_EXPORTED_FROM_ABI void __throw_system_error(int __ev, const char* __what_arg);
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[[__noreturn__]] _LIBCPP_HIDE_FROM_ABI inline void __throw_system_error(error_code __ec, const char* __what_arg) {
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#if _LIBCPP_HAS_EXCEPTIONS
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throw system_error(__ec, __what_arg);
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#else
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_LIBCPP_VERBOSE_ABORT(
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"system_error was thrown in -fno-exceptions mode with error %i and message \"%s\"", __ec.value(), __what_arg);
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#endif
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___SYSTEM_ERROR_SYSTEM_ERROR_H
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