7ded638ea3
Certain headers require `optional<T&>`, so it may be beneficial to split out `optional<T>` and `optional<T&>`. This can allow consumers to only bring in the `optional` flavour it needs.. - Parcel out the respective pieces into their own header. - Certain sources rely on transitive includes brought in by `<optional>`, so they're kept there for now, and only tests have been fixed. --------- Co-authored-by: Louis Dionne <ldionne.2@gmail.com>
45 lines
1.3 KiB
C++
45 lines
1.3 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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#ifndef _LIBCPP___OPTIONAL_SWAP_H
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#define _LIBCPP___OPTIONAL_SWAP_H
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#include <__config>
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#include <__type_traits/enable_if.h>
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#include <__type_traits/is_constructible.h>
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#include <__type_traits/is_reference.h>
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#include <__type_traits/is_swappable.h>
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#include <__fwd/optional.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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#if _LIBCPP_STD_VER >= 17
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _Tp,
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enable_if_t<(is_move_constructible_v<_Tp> && is_swappable_v<_Tp>)
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# if _LIBCPP_STD_VER >= 26
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|| is_reference_v<_Tp>
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# endif
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,
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int> = 0>
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inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 void
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swap(optional<_Tp>& __x, optional<_Tp>& __y) noexcept(noexcept(__x.swap(__y))) {
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__x.swap(__y);
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP_STD_VER >= 17
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#endif // _LIBCPP___OPTIONAL_SWAP_H
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