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>`.
81 lines
2.0 KiB
C++
81 lines
2.0 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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// [char.traits], character traits
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using std::char_traits;
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// [basic.string], basic_string
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using std::basic_string;
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using std::operator+;
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using std::operator==;
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using std::operator<=>;
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// [string.special], swap
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using std::swap;
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// [string.io], inserters and extractors
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using std::operator>>;
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using std::operator<<;
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using std::getline;
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// [string.erasure], erasure
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using std::erase;
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using std::erase_if;
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// basic_string typedef-names
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using std::string;
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using std::u16string;
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using std::u32string;
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#if _LIBCPP_HAS_CHAR8_T
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using std::u8string;
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#endif
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#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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using std::wstring;
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#endif
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// [string.conversions], numeric conversions
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using std::stod;
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using std::stof;
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using std::stoi;
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using std::stol;
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using std::stold;
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using std::stoll;
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using std::stoul;
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using std::stoull;
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using std::to_string;
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#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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using std::to_wstring;
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#endif
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namespace pmr {
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using std::pmr::basic_string;
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using std::pmr::string;
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using std::pmr::u16string;
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using std::pmr::u32string;
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#if _LIBCPP_HAS_CHAR8_T
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using std::pmr::u8string;
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#endif
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#ifndef _LIBCPP_HAS_NO_WIDE_CHARACTERS
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using std::pmr::wstring;
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#endif
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} // namespace pmr
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// [basic.string.hash], hash support
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using std::hash;
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inline namespace literals {
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inline namespace string_literals {
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// [basic.string.literals], suffix for basic_string literals
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using std::literals::string_literals::operator""s;
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} // namespace string_literals
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} // namespace literals
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} // namespace std
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