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>`.
51 lines
1.6 KiB
C++
51 lines
1.6 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___FORMAT_FORMAT_ERROR_H
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#define _LIBCPP___FORMAT_FORMAT_ERROR_H
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#include <__config>
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#include <__verbose_abort>
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#include <stdexcept>
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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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#if _LIBCPP_STD_VER >= 20
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_LIBCPP_DIAGNOSTIC_PUSH
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_LIBCPP_CLANG_DIAGNOSTIC_IGNORED("-Wweak-vtables")
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class _LIBCPP_EXPORTED_FROM_ABI format_error : public runtime_error {
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public:
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_LIBCPP_HIDE_FROM_ABI explicit format_error(const string& __s) : runtime_error(__s) {}
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_LIBCPP_HIDE_FROM_ABI explicit format_error(const char* __s) : runtime_error(__s) {}
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_LIBCPP_HIDE_FROM_ABI format_error(const format_error&) = default;
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_LIBCPP_HIDE_FROM_ABI format_error& operator=(const format_error&) = default;
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_LIBCPP_HIDE_FROM_ABI_VIRTUAL
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~format_error() noexcept override = default;
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};
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_LIBCPP_DIAGNOSTIC_POP
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[[noreturn]] inline _LIBCPP_HIDE_FROM_ABI void __throw_format_error(const char* __s) {
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# if _LIBCPP_HAS_EXCEPTIONS
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throw format_error(__s);
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# else
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_LIBCPP_VERBOSE_ABORT("format_error was thrown in -fno-exceptions mode with message \"%s\"", __s);
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# endif
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}
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#endif // _LIBCPP_STD_VER >= 20
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FORMAT_FORMAT_ERROR_H
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