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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>`.
47 lines
1.4 KiB
C++
47 lines
1.4 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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// [string.view.template], class template basic_string_view
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using std::basic_string_view;
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namespace ranges {
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using std::ranges::enable_borrowed_range;
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using std::ranges::enable_view;
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} // namespace ranges
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// [string.view.comparison], non-member comparison functions
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using std::operator==;
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using std::operator<=>;
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// [string.view.io], inserters and extractors
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using std::operator<<;
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// basic_string_view typedef-names
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using std::string_view;
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using std::u16string_view;
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using std::u32string_view;
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#if _LIBCPP_HAS_CHAR8_T
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using std::u8string_view;
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#endif
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#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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using std::wstring_view;
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#endif
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// [string.view.hash], hash support
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using std::hash;
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inline namespace literals {
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inline namespace string_view_literals {
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// [string.view.literals], suffix for basic_string_view literals
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using std::literals::string_view_literals::operator""sv;
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} // namespace string_view_literals
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} // namespace literals
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} // namespace std
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