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// -*- 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___FUNCTIONAL_REFERENCE_WRAPPER_H
#define _LIBCPP___FUNCTIONAL_REFERENCE_WRAPPER_H
#include <__config>
#include <__functional/invoke.h>
#include <__functional/weak_result_type.h>
#include <__memory/addressof.h>
#include <__type_traits/enable_if.h>
#include <__type_traits/remove_cvref.h>
#include <__utility/declval.h>
#include <__utility/forward.h>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
template <class _Tp>
class _LIBCPP_TEMPLATE_VIS reference_wrapper : public __weak_result_type<_Tp>
{
public:
// types
typedef _Tp type;
private:
type* __f_;
static 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(std::declval<_Up>())) > >
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
reference_wrapper(_Up&& __u) _NOEXCEPT_(noexcept(__fun(std::declval<_Up>()))) {
type& __f = static_cast<_Up&&>(__u);
__f_ = _VSTD::addressof(__f);
}
// access
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
operator type&() const _NOEXCEPT {return *__f_;}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
type& get() const _NOEXCEPT {return *__f_;}
// invoke
template <class... _ArgTypes>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
typename __invoke_of<type&, _ArgTypes...>::type
operator() (_ArgTypes&&... __args) const {
return std::__invoke(get(), std::forward<_ArgTypes>(__args)...);
}
};
#if _LIBCPP_STD_VER > 14
template <class _Tp>
reference_wrapper(_Tp&) -> reference_wrapper<_Tp>;
#endif
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
reference_wrapper<_Tp>
ref(_Tp& __t) _NOEXCEPT
{
return reference_wrapper<_Tp>(__t);
}
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
reference_wrapper<_Tp>
ref(reference_wrapper<_Tp> __t) _NOEXCEPT
{
return __t;
}
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
reference_wrapper<const _Tp>
cref(const _Tp& __t) _NOEXCEPT
{
return reference_wrapper<const _Tp>(__t);
}
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_SINCE_CXX20
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;
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___FUNCTIONAL_REFERENCE_WRAPPER_H
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