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>`.
108 lines
2.8 KiB
C++
108 lines
2.8 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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#ifndef _LIBCPP___FWD_STRING_H
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#define _LIBCPP___FWD_STRING_H
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#include <__config>
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#include <__fwd/memory.h>
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#include <__fwd/memory_resource.h>
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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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template <class _CharT>
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struct _LIBCPP_TEMPLATE_VIS char_traits;
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template <>
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struct char_traits<char>;
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#if _LIBCPP_HAS_CHAR8_T
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template <>
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struct char_traits<char8_t>;
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#endif
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template <>
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struct char_traits<char16_t>;
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template <>
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struct char_traits<char32_t>;
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#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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template <>
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struct char_traits<wchar_t>;
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#endif
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template <class _CharT, class _Traits = char_traits<_CharT>, class _Allocator = allocator<_CharT> >
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class _LIBCPP_TEMPLATE_VIS basic_string;
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using string = basic_string<char>;
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#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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using wstring = basic_string<wchar_t>;
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#endif
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#if _LIBCPP_HAS_CHAR8_T
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using u8string = basic_string<char8_t>;
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#endif
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using u16string = basic_string<char16_t>;
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using u32string = basic_string<char32_t>;
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#if _LIBCPP_STD_VER >= 17
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namespace pmr {
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template <class _CharT, class _Traits = char_traits<_CharT>>
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using basic_string _LIBCPP_AVAILABILITY_PMR = std::basic_string<_CharT, _Traits, polymorphic_allocator<_CharT>>;
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using string _LIBCPP_AVAILABILITY_PMR = basic_string<char>;
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# ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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using wstring _LIBCPP_AVAILABILITY_PMR = basic_string<wchar_t>;
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# endif
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# if _LIBCPP_HAS_CHAR8_T
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using u8string _LIBCPP_AVAILABILITY_PMR = basic_string<char8_t>;
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# endif
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using u16string _LIBCPP_AVAILABILITY_PMR = basic_string<char16_t>;
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using u32string _LIBCPP_AVAILABILITY_PMR = basic_string<char32_t>;
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} // namespace pmr
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#endif // _LIBCPP_STD_VER >= 17
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// clang-format off
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template <class _CharT, class _Traits, class _Allocator>
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class _LIBCPP_PREFERRED_NAME(string)
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#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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_LIBCPP_PREFERRED_NAME(wstring)
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#endif
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#if _LIBCPP_HAS_CHAR8_T
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_LIBCPP_PREFERRED_NAME(u8string)
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#endif
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_LIBCPP_PREFERRED_NAME(u16string)
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_LIBCPP_PREFERRED_NAME(u32string)
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#if _LIBCPP_STD_VER >= 17
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_LIBCPP_PREFERRED_NAME(pmr::string)
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# ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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_LIBCPP_PREFERRED_NAME(pmr::wstring)
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# endif
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# if _LIBCPP_HAS_CHAR8_T
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_LIBCPP_PREFERRED_NAME(pmr::u8string)
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# endif
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_LIBCPP_PREFERRED_NAME(pmr::u16string)
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_LIBCPP_PREFERRED_NAME(pmr::u32string)
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#endif
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basic_string;
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// clang-format on
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___FWD_STRING_H
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