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38 lines
1.2 KiB
C++
38 lines
1.2 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___UTILITY_FORWARD_H
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#define _LIBCPP___UTILITY_FORWARD_H
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#include <__config>
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#include <__type_traits/is_reference.h>
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#include <__type_traits/remove_reference.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 _Tp>
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_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Tp&&
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forward(_LIBCPP_LIFETIMEBOUND __libcpp_remove_reference_t<_Tp>& __t) _NOEXCEPT {
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return static_cast<_Tp&&>(__t);
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}
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template <class _Tp>
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_LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Tp&&
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forward(_LIBCPP_LIFETIMEBOUND __libcpp_remove_reference_t<_Tp>&& __t) _NOEXCEPT {
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static_assert(!is_lvalue_reference<_Tp>::value, "cannot forward an rvalue as an lvalue");
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return static_cast<_Tp&&>(__t);
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}
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___UTILITY_FORWARD_H
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