1//===----------------------------------------------------------------------===// 2// 3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4// See https://llvm.org/LICENSE.txt for license information. 5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6// 7//===----------------------------------------------------------------------===// 8 9#ifndef _LIBCPP___TYPE_TRAITS_COPY_CVREF_H 10#define _LIBCPP___TYPE_TRAITS_COPY_CVREF_H 11 12#include <__config> 13#include <__type_traits/add_lvalue_reference.h> 14#include <__type_traits/add_rvalue_reference.h> 15#include <__type_traits/copy_cv.h> 16 17#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 18# pragma GCC system_header 19#endif 20 21_LIBCPP_BEGIN_NAMESPACE_STD 22 23template <class _From, class _To> 24struct __copy_cvref 25{ 26 using type = __copy_cv_t<_From, _To>; 27}; 28 29template <class _From, class _To> 30struct __copy_cvref<_From&, _To> 31{ 32 using type = __add_lvalue_reference_t<__copy_cv_t<_From, _To> >; 33}; 34 35template <class _From, class _To> 36struct __copy_cvref<_From&&, _To> 37{ 38 using type = __add_rvalue_reference_t<__copy_cv_t<_From, _To> >; 39}; 40 41template <class _From, class _To> 42using __copy_cvref_t = typename __copy_cvref<_From, _To>::type; 43 44_LIBCPP_END_NAMESPACE_STD 45 46#endif // _LIBCPP___TYPE_TRAITS_COPY_CVREF_H 47