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//===----------------------------------------------------------------------===//
//
// 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 _LIBCUDACXX___FUNCTIONAL_REFERENCE_WRAPPER_H
#define _LIBCUDACXX___FUNCTIONAL_REFERENCE_WRAPPER_H
#ifndef __cuda_std__
#include <__config>
#endif // __cuda_std__
#include "../__functional/weak_result_type.h"
#include "../__memory/addressof.h"
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
_LIBCUDACXX_BEGIN_NAMESPACE_STD
template <class _Tp>
class _LIBCUDACXX_TEMPLATE_VIS reference_wrapper : public __weak_result_type<_Tp>
{
public:
// types
typedef _Tp type;
private:
type* __f_;
static _LIBCUDACXX_INLINE_VISIBILITY void __fun(_Tp&) noexcept;
static void __fun(_Tp&&) = delete;
public:
template <class _Up, class = __enable_if_t<!__is_same_uncvref<_Up, reference_wrapper>::value, decltype(__fun(declval<_Up>())) > >
_LIBCUDACXX_INLINE_VISIBILITY _LIBCUDACXX_CONSTEXPR_AFTER_CXX17
reference_wrapper(_Up&& __u) noexcept(noexcept(__fun(declval<_Up>()))) {
type& __f = static_cast<_Up&&>(__u);
__f_ = _CUDA_VSTD::addressof(__f);
}
// access
_LIBCUDACXX_INLINE_VISIBILITY _LIBCUDACXX_CONSTEXPR_AFTER_CXX17
operator type&() const noexcept {return *__f_;}
_LIBCUDACXX_INLINE_VISIBILITY _LIBCUDACXX_CONSTEXPR_AFTER_CXX17
type& get() const noexcept {return *__f_;}
// invoke
template <class... _ArgTypes>
_LIBCUDACXX_INLINE_VISIBILITY _LIBCUDACXX_CONSTEXPR_AFTER_CXX17
typename __invoke_of<type&, _ArgTypes...>::type
operator() (_ArgTypes&&... __args) const {
return _CUDA_VSTD::__invoke(get(), _CUDA_VSTD::forward<_ArgTypes>(__args)...);
}
};
#if _LIBCUDACXX_STD_VER > 14 && !defined(_LIBCUDACXX_HAS_NO_DEDUCTION_GUIDES)
template <class _Tp>
_LIBCUDACXX_HOST_DEVICE reference_wrapper(_Tp&) -> reference_wrapper<_Tp>;
#endif
template <class _Tp>
inline _LIBCUDACXX_INLINE_VISIBILITY _LIBCUDACXX_CONSTEXPR_AFTER_CXX17
reference_wrapper<_Tp>
ref(_Tp& __t) noexcept
{
return reference_wrapper<_Tp>(__t);
}
template <class _Tp>
inline _LIBCUDACXX_INLINE_VISIBILITY _LIBCUDACXX_CONSTEXPR_AFTER_CXX17
reference_wrapper<_Tp>
ref(reference_wrapper<_Tp> __t) noexcept
{
return __t;
}
template <class _Tp>
inline _LIBCUDACXX_INLINE_VISIBILITY _LIBCUDACXX_CONSTEXPR_AFTER_CXX17
reference_wrapper<const _Tp>
cref(const _Tp& __t) noexcept
{
return reference_wrapper<const _Tp>(__t);
}
template <class _Tp>
inline _LIBCUDACXX_INLINE_VISIBILITY _LIBCUDACXX_CONSTEXPR_AFTER_CXX17
reference_wrapper<const _Tp>
cref(reference_wrapper<_Tp> __t) noexcept
{
return __t;
}
template <class _Tp> void ref(const _Tp&&) = delete;
template <class _Tp> void cref(const _Tp&&) = delete;
_LIBCUDACXX_END_NAMESPACE_STD
#endif // _LIBCUDACXX___FUNCTIONAL_REFERENCE_WRAPPER_H
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