Christopher Di Bella 5aaefa510e [libcxx][modules] protects users from relying on detail headers
libc++ has started splicing standard library headers into much more
fine-grained content for maintainability. It's very likely that outdated
and naive tooling (some of which is outside of LLVM's scope) will
suggest users include things such as <__ranges/access.h> instead of
<ranges>, and Hyrum's law suggests that users will eventually begin to
rely on this without the help of tooling. As such, this commit
intends to protect users from themselves, by making it a hard error for
anyone outside of the standard library to include libc++ detail headers.

Differential Revision: https://reviews.llvm.org/D106124
2022-02-26 09:00:25 +00:00

53 lines
1.5 KiB
C++

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___ALGORITHM_IN_IN_RESULT_H
#define _LIBCPP___ALGORITHM_IN_IN_RESULT_H
#include <__concepts/convertible_to.h>
#include <__config>
#include <__utility/move.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
# pragma clang include_instead(<algorithm>)
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#if !defined(_LIBCPP_HAS_NO_CONCEPTS)
namespace ranges {
template <class _I1, class _I2>
struct in_in_result {
_LIBCPP_NO_UNIQUE_ADDRESS _I1 in1;
_LIBCPP_NO_UNIQUE_ADDRESS _I2 in2;
template <class _II1, class _II2>
requires convertible_to<const _I1&, _II1> && convertible_to<const _I2&, _II2>
_LIBCPP_HIDE_FROM_ABI constexpr
operator in_in_result<_II1, _II2>() const & {
return {in1, in2};
}
template <class _II1, class _II2>
requires convertible_to<_I1, _II1> && convertible_to<_I2, _II2>
_LIBCPP_HIDE_FROM_ABI constexpr
operator in_in_result<_II1, _II2>() && { return {_VSTD::move(in1), _VSTD::move(in2)}; }
};
} // namespace ranges
#endif // !defined(_LIBCPP_HAS_NO_CONCEPTS)
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___ALGORITHM_IN_IN_RESULT_H