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
1.1 KiB
C++
41 lines
1.1 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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export namespace std {
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using std::streampos;
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#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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using std::wstreampos;
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#endif
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using std::u16streampos;
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using std::u32streampos;
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#if _LIBCPP_HAS_CHAR8_T
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using std::u8streampos;
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#endif
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#ifndef _LIBCPP_HAS_NO_EXPERIMENTAL_SYNCSTREAM
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using std::basic_osyncstream;
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using std::basic_syncbuf;
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#endif
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using std::istreambuf_iterator;
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using std::ostreambuf_iterator;
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#ifndef _LIBCPP_HAS_NO_EXPERIMENTAL_SYNCSTREAM
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using std::osyncstream;
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using std::syncbuf;
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# ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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using std::wosyncstream;
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using std::wsyncbuf;
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# endif
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#endif // _LIBCPP_HAS_NO_EXPERIMENTAL_SYNCSTREAM
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using std::fpos;
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} // namespace std
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