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>`.
41 lines
1.2 KiB
C++
41 lines
1.2 KiB
C++
//===----------------------------------------------------------------------===//
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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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// Define ~condition_variable.
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//
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// On some platforms ~condition_variable has been made trivial and the
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// definition is only provided for ABI compatibility.
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#include <__config>
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#include <__thread/support.h>
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#if _LIBCPP_ABI_VERSION == 1 || !_LIBCPP_HAS_TRIVIAL_CONDVAR_DESTRUCTION
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# define NEEDS_CONDVAR_DESTRUCTOR
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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#ifdef NEEDS_CONDVAR_DESTRUCTOR
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class _LIBCPP_EXPORTED_FROM_ABI condition_variable {
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__libcpp_condvar_t __cv_ = _LIBCPP_CONDVAR_INITIALIZER;
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public:
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_LIBCPP_HIDE_FROM_ABI constexpr condition_variable() noexcept = default;
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~condition_variable();
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condition_variable(const condition_variable&) = delete;
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condition_variable& operator=(const condition_variable&) = delete;
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};
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condition_variable::~condition_variable() { __libcpp_condvar_destroy(&__cv_); }
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#endif
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_LIBCPP_END_NAMESPACE_STD
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