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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 _LIBCPP___TUPLE_SFINAE_HELPERS_H
#define _LIBCPP___TUPLE_SFINAE_HELPERS_H
#include <__config>
#include <__fwd/tuple.h>
#include <__tuple/make_tuple_types.h>
#include <__tuple/tuple_element.h>
#include <__tuple/tuple_like_ext.h>
#include <__tuple/tuple_size.h>
#include <__tuple/tuple_types.h>
#include <__type_traits/enable_if.h>
#include <__type_traits/integral_constant.h>
#include <__type_traits/is_assignable.h>
#include <__type_traits/is_constructible.h>
#include <__type_traits/is_convertible.h>
#include <__type_traits/is_same.h>
#include <__type_traits/remove_cvref.h>
#include <__type_traits/remove_reference.h>
#include <cstddef>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#ifndef _LIBCPP_CXX03_LANG
template <bool ..._Preds>
struct __all_dummy;
template <bool ..._Pred>
struct __all : _IsSame<__all_dummy<_Pred...>, __all_dummy<((void)_Pred, true)...>> {};
struct __tuple_sfinae_base {
template <template <class, class...> class _Trait,
class ..._LArgs, class ..._RArgs>
static auto __do_test(__tuple_types<_LArgs...>, __tuple_types<_RArgs...>)
-> __all<__enable_if_t<_Trait<_LArgs, _RArgs>::value, bool>{true}...>;
template <template <class...> class>
static auto __do_test(...) -> false_type;
template <class _FromArgs, class _ToArgs>
using __constructible = decltype(__do_test<is_constructible>(declval<_ToArgs>(), declval<_FromArgs>()));
template <class _FromArgs, class _ToArgs>
using __convertible = decltype(__do_test<is_convertible>(declval<_FromArgs>(), declval<_ToArgs>()));
template <class _FromArgs, class _ToArgs>
using __assignable = decltype(__do_test<is_assignable>(declval<_ToArgs>(), declval<_FromArgs>()));
};
// __tuple_convertible
template <class _Tp, class _Up, bool = __tuple_like_ext<__libcpp_remove_reference_t<_Tp> >::value,
bool = __tuple_like_ext<_Up>::value,
class = void>
struct __tuple_convertible
: public false_type {};
template <class _Tp, class _Up>
struct __tuple_convertible<_Tp, _Up, true, true,
typename enable_if<(tuple_size<typename remove_reference<_Tp>::type>::value == tuple_size<_Up>::value)>::type>
: public __tuple_sfinae_base::__convertible<
typename __make_tuple_types<_Tp>::type
, typename __make_tuple_types<_Up>::type
>
{};
// __tuple_constructible
template <class _Tp, class _Up, bool = __tuple_like_ext<__libcpp_remove_reference_t<_Tp> >::value,
bool = __tuple_like_ext<_Up>::value>
struct __tuple_constructible
: public false_type {};
template <class _Tp, class _Up>
struct __tuple_constructible<_Tp, _Up, true, true>
: public __tuple_sfinae_base::__constructible<
typename __make_tuple_types<_Tp>::type
, typename __make_tuple_types<_Up>::type
>
{};
// __tuple_assignable
template <class _Tp, class _Up, bool = __tuple_like_ext<__libcpp_remove_reference_t<_Tp> >::value,
bool = __tuple_like_ext<_Up>::value>
struct __tuple_assignable
: public false_type {};
template <class _Tp, class _Up>
struct __tuple_assignable<_Tp, _Up, true, true>
: public __tuple_sfinae_base::__assignable<
typename __make_tuple_types<_Tp>::type
, typename __make_tuple_types<_Up&>::type
>
{};
template <size_t _Ip, class ..._Tp>
struct _LIBCPP_TEMPLATE_VIS tuple_element<_Ip, tuple<_Tp...> >
{
typedef _LIBCPP_NODEBUG typename tuple_element<_Ip, __tuple_types<_Tp...> >::type type;
};
struct _LIBCPP_EXPORTED_FROM_ABI __check_tuple_constructor_fail {
static _LIBCPP_HIDE_FROM_ABI constexpr bool __enable_explicit_default() { return false; }
static _LIBCPP_HIDE_FROM_ABI constexpr bool __enable_implicit_default() { return false; }
template <class ...>
static _LIBCPP_HIDE_FROM_ABI constexpr bool __enable_explicit() { return false; }
template <class ...>
static _LIBCPP_HIDE_FROM_ABI constexpr bool __enable_implicit() { return false; }
template <class ...>
static _LIBCPP_HIDE_FROM_ABI constexpr bool __enable_assign() { return false; }
};
#endif // !defined(_LIBCPP_CXX03_LANG)
#if _LIBCPP_STD_VER >= 17
template <bool _CanCopy, bool _CanMove>
struct __sfinae_ctor_base {};
template <>
struct __sfinae_ctor_base<false, false> {
__sfinae_ctor_base() = default;
__sfinae_ctor_base(__sfinae_ctor_base const&) = delete;
__sfinae_ctor_base(__sfinae_ctor_base &&) = delete;
__sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
__sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
};
template <>
struct __sfinae_ctor_base<true, false> {
__sfinae_ctor_base() = default;
__sfinae_ctor_base(__sfinae_ctor_base const&) = default;
__sfinae_ctor_base(__sfinae_ctor_base &&) = delete;
__sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
__sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
};
template <>
struct __sfinae_ctor_base<false, true> {
__sfinae_ctor_base() = default;
__sfinae_ctor_base(__sfinae_ctor_base const&) = delete;
__sfinae_ctor_base(__sfinae_ctor_base &&) = default;
__sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
__sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
};
template <bool _CanCopy, bool _CanMove>
struct __sfinae_assign_base {};
template <>
struct __sfinae_assign_base<false, false> {
__sfinae_assign_base() = default;
__sfinae_assign_base(__sfinae_assign_base const&) = default;
__sfinae_assign_base(__sfinae_assign_base &&) = default;
__sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete;
__sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete;
};
template <>
struct __sfinae_assign_base<true, false> {
__sfinae_assign_base() = default;
__sfinae_assign_base(__sfinae_assign_base const&) = default;
__sfinae_assign_base(__sfinae_assign_base &&) = default;
__sfinae_assign_base& operator=(__sfinae_assign_base const&) = default;
__sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete;
};
template <>
struct __sfinae_assign_base<false, true> {
__sfinae_assign_base() = default;
__sfinae_assign_base(__sfinae_assign_base const&) = default;
__sfinae_assign_base(__sfinae_assign_base &&) = default;
__sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete;
__sfinae_assign_base& operator=(__sfinae_assign_base&&) = default;
};
#endif // _LIBCPP_STD_VER >= 17
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___TUPLE_SFINAE_HELPERS_H
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