// -*- C++ -*-
//===--------------------------- tuple ------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_TUPLE
#define _LIBCPP_TUPLE
/*
tuple synopsis
namespace std
{
template <class... T>
class tuple {
public:
constexpr tuple();
explicit tuple(const T&...); // constexpr in C++14
template <class... U>
explicit tuple(U&&...); // constexpr in C++14
tuple(const tuple&) = default;
tuple(tuple&&) = default;
template <class... U>
tuple(const tuple<U...>&); // constexpr in C++14
template <class... U>
tuple(tuple<U...>&&); // constexpr in C++14
template <class U1, class U2>
tuple(const pair<U1, U2>&); // iff sizeof...(T) == 2 // constexpr in C++14
template <class U1, class U2>
tuple(pair<U1, U2>&&); // iff sizeof...(T) == 2 // constexpr in C++14
// allocator-extended constructors
template <class Alloc>
tuple(allocator_arg_t, const Alloc& a);
template <class Alloc>
tuple(allocator_arg_t, const Alloc& a, const T&...);
template <class Alloc, class... U>
tuple(allocator_arg_t, const Alloc& a, U&&...);
template <class Alloc>
tuple(allocator_arg_t, const Alloc& a, const tuple&);
template <class Alloc>
tuple(allocator_arg_t, const Alloc& a, tuple&&);
template <class Alloc, class... U>
tuple(allocator_arg_t, const Alloc& a, const tuple<U...>&);
template <class Alloc, class... U>
tuple(allocator_arg_t, const Alloc& a, tuple<U...>&&);
template <class Alloc, class U1, class U2>
tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&);
template <class Alloc, class U1, class U2>
tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&&);
tuple& operator=(const tuple&);
tuple&
operator=(tuple&&) noexcept(AND(is_nothrow_move_assignable<T>::value ...));
template <class... U>
tuple& operator=(const tuple<U...>&);
template <class... U>
tuple& operator=(tuple<U...>&&);
template <class U1, class U2>
tuple& operator=(const pair<U1, U2>&); // iff sizeof...(T) == 2
template <class U1, class U2>
tuple& operator=(pair<U1, U2>&&); //iffsizeof...(T) == 2
void swap(tuple&) noexcept(AND(swap(declval<T&>(), declval<T&>())...));
};
const unspecified ignore;
template <class... T> tuple<V...> make_tuple(T&&...); // constexpr in C++14
template <class... T> tuple<ATypes...> forward_as_tuple(T&&...) noexcept; // constexpr in C++14
template <class... T> tuple<T&...> tie(T&...) noexcept; // constexpr in C++14
template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls); // constexpr in C++14
// 20.4.1.4, tuple helper classes:
template <class T> class tuple_size; // undefined
template <class... T> class tuple_size<tuple<T...>>;
template <size_t I, class T> class tuple_element; // undefined
template <size_t I, class... T> class tuple_element<I, tuple<T...>>;
template <size_t I, class T>
using tuple_element_t = typename tuple_element <I, T>::type; // C++14
// 20.4.1.5, element access:
template <size_t I, class... T>
typename tuple_element<I, tuple<T...>>::type&
get(tuple<T...>&) noexcept; // constexpr in C++14
template <size_t I, class... T>
const typename tuple_element<I, tuple<T...>>::type&
get(const tuple<T...>&) noexcept; // constexpr in C++14
template <size_t I, class... T>
typename tuple_element<I, tuple<T...>>::type&&
get(tuple<T...>&&) noexcept; // constexpr in C++14
template <size_t I, class... T>
const typename tuple_element<I, tuple<T...>>::type&&
get(const tuple<T...>&&) noexcept; // constexpr in C++14
template <class T1, class... T>
constexpr T1& get(tuple<T...>&) noexcept; // C++14
template <class T1, class... T>
constexpr const T1& get(const tuple<T...>&) noexcept; // C++14
template <class T1, class... T>
constexpr T1&& get(tuple<T...>&&) noexcept; // C++14
template <class T1, class... T>
constexpr const T1&& get(const tuple<T...>&&) noexcept; // C++14
// 20.4.1.6, relational operators:
template<class... T, class... U> bool operator==(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
template<class... T, class... U> bool operator<(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
template<class... T, class... U> bool operator!=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
template<class... T, class... U> bool operator>(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
template<class... T, class... U> bool operator<=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
template<class... T, class... U> bool operator>=(const tuple<T...>&, const tuple<U...>&); // constexpr in C++14
template <class... Types, class Alloc>
struct uses_allocator<tuple<Types...>, Alloc>;
template <class... Types>
void
swap(tuple<Types...>& x, tuple<Types...>& y) noexcept(noexcept(x.swap(y)));
} // std
*/
#include <__config>
#include <__tuple>
#include <cstddef>
#include <type_traits>
#include <__functional_base>
#include <utility>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
#ifndef _LIBCPP_HAS_NO_VARIADICS
// tuple_size
template <class ..._Tp>
class _LIBCPP_TYPE_VIS_ONLY tuple_size<tuple<_Tp...> >
: public integral_constant<size_t, sizeof...(_Tp)>
{
};
// tuple_element
template <size_t _Ip, class ..._Tp>
class _LIBCPP_TYPE_VIS_ONLY tuple_element<_Ip, tuple<_Tp...> >
{
public:
typedef typename tuple_element<_Ip, __tuple_types<_Tp...> >::type type;
};
#if _LIBCPP_STD_VER > 11
template <size_t _Ip, class ..._Tp>
using tuple_element_t = typename tuple_element <_Ip, _Tp...>::type;
#endif
// __tuple_leaf
template <size_t _Ip, class _Hp,
bool=is_empty<_Hp>::value && !__libcpp_is_final<_Hp>::value
>
class __tuple_leaf;
template <size_t _Ip, class _Hp, bool _Ep>
inline _LIBCPP_INLINE_VISIBILITY
void swap(__tuple_leaf<_Ip, _Hp, _Ep>& __x, __tuple_leaf<_Ip, _Hp, _Ep>& __y)
_NOEXCEPT_(__is_nothrow_swappable<_Hp>::value)
{
swap(__x.get(), __y.get());
}
template <size_t _Ip, class _Hp, bool>
class __tuple_leaf
{
_Hp value;
__tuple_leaf& operator=(const __tuple_leaf&);
public:
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR __tuple_leaf()
_NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) : value()
{static_assert(!is_reference<_Hp>::value,
"Attempted to default construct a reference element in a tuple");}
template <class _Alloc>
_LIBCPP_INLINE_VISIBILITY
__tuple_leaf(integral_constant<int, 0>, const _Alloc&)
: value()
{static_assert(!is_reference<_Hp>::value,
"Attempted to default construct a reference element in a tuple");}
template <class _Alloc>
_LIBCPP_INLINE_VISIBILITY
__tuple_leaf(integral_constant<int, 1>, const _Alloc& __a)
: value(allocator_arg_t(), __a)
{static_assert(!is_reference<_Hp>::value,
"Attempted to default construct a reference element in a tuple");}
template <class _Alloc>
_LIBCPP_INLINE_VISIBILITY
__tuple_leaf(integral_constant<int, 2>, const _Alloc& __a)
: value(__a)
{static_assert(!is_reference<_Hp>::value,
"Attempted to default construct a reference element in a tuple");}
template <class _Tp,
class = typename enable_if<
__lazy_and<
__lazy_not<is_same<typename decay<_Tp>::type, __tuple_leaf>>
, is_constructible<_Hp, _Tp>
>::value
>::type
>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value))
: value(_VSTD::forward<_Tp>(__t))
{static_assert(!is_reference<_Hp>::value ||
(is_lvalue_reference<_Hp>::value &&
(is_lvalue_reference<_Tp>::value ||
is_same<typename remove_reference<_Tp>::type,
reference_wrapper<
typename remove_reference<_Hp>::type
>
>::value)) ||
(is_rvalue_reference<_Hp>::value &&
!is_lvalue_reference<_Tp>::value),
"Attempted to construct a reference element in a tuple with an rvalue");}
template <class _Tp, class _Alloc>
_LIBCPP_INLINE_VISIBILITY
explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t)
: value(_VSTD::forward<_Tp>(__t))
{static_assert(!is_lvalue_reference<_Hp>::value ||
(is_lvalue_reference<_Hp>::value &&
(is_lvalue_reference<_Tp>::value ||
is_same<typename remove_reference<_Tp>::type,
reference_wrapper<
typename remove_reference<_Hp>::type
>
>::value)),
"Attempted to construct a reference element in a tuple with an rvalue");}
template <class _Tp, class _Alloc>
_LIBCPP_INLINE_VISIBILITY
explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t)
: value(allocator_arg_t(), __a, _VSTD::forward<_Tp>(__t))
{static_assert(!is_lvalue_reference<_Hp>::value ||
(is_lvalue_reference<_Hp>::value &&
(is_lvalue_reference<_Tp>::value ||
is_same<typename remove_reference<_Tp>::type,
reference_wrapper<
typename remove_reference<_Hp>::type
>
>::value)),
"Attempted to construct a reference element in a tuple with an rvalue");}
template <class _Tp, class _Alloc>
_LIBCPP_INLINE_VISIBILITY
explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t)
: value(_VSTD::forward<_Tp>(__t), __a)
{static_assert(!is_lvalue_reference<_Hp>::value ||
(is_lvalue_reference<_Hp>::value &&
(is_lvalue_reference<_Tp>::value ||
is_same<typename remove_reference<_Tp>::type,
reference_wrapper<
typename remove_reference<_Hp>::type
>
>::value)),
"Attempted to construct a reference element in a tuple with an rvalue");}
__tuple_leaf(const __tuple_leaf& __t) = default;
__tuple_leaf(__tuple_leaf&& __t) = default;
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY
__tuple_leaf&
operator=(_Tp&& __t) _NOEXCEPT_((is_nothrow_assignable<_Hp&, _Tp>::value))
{
value = _VSTD::forward<_Tp>(__t);
return *this;
}
_LIBCPP_INLINE_VISIBILITY
int swap(__tuple_leaf& __t) _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value)
{
_VSTD::swap(*this, __t);
return 0;
}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 _Hp& get() _NOEXCEPT {return value;}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const _Hp& get() const _NOEXCEPT {return value;}
};
template <size_t _Ip, class _Hp>
class __tuple_leaf<_Ip, _Hp, true>
: private _Hp
{
__tuple_leaf& operator=(const __tuple_leaf&);
public:
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR __tuple_leaf()
_NOEXCEPT_(is_nothrow_default_constructible<_Hp>::value) {}
template <class _Alloc>
_LIBCPP_INLINE_VISIBILITY
__tuple_leaf(integral_constant<int, 0>, const _Alloc&) {}
template <class _Alloc>
_LIBCPP_INLINE_VISIBILITY
__tuple_leaf(integral_constant<int, 1>, const _Alloc& __a)
: _Hp(allocator_arg_t(), __a) {}
template <class _Alloc>
_LIBCPP_INLINE_VISIBILITY
__tuple_leaf(integral_constant<int, 2>, const _Alloc& __a)
: _Hp(__a) {}
template <class _Tp,
class = typename enable_if<
__lazy_and<
__lazy_not<is_same<typename decay<_Tp>::type, __tuple_leaf>>
, is_constructible<_Hp, _Tp>
>::value
>::type
>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
explicit __tuple_leaf(_Tp&& __t) _NOEXCEPT_((is_nothrow_constructible<_Hp, _Tp>::value))
: _Hp(_VSTD::forward<_Tp>(__t)) {}
template <class _Tp, class _Alloc>
_LIBCPP_INLINE_VISIBILITY
explicit __tuple_leaf(integral_constant<int, 0>, const _Alloc&, _Tp&& __t)
: _Hp(_VSTD::forward<_Tp>(__t)) {}
template <class _Tp, class _Alloc>
_LIBCPP_INLINE_VISIBILITY
explicit __tuple_leaf(integral_constant<int, 1>, const _Alloc& __a, _Tp&& __t)
: _Hp(allocator_arg_t(), __a, _VSTD::forward<_Tp>(__t)) {}
template <class _Tp, class _Alloc>
_LIBCPP_INLINE_VISIBILITY
explicit __tuple_leaf(integral_constant<int, 2>, const _Alloc& __a, _Tp&& __t)
: _Hp(_VSTD::forward<_Tp>(__t), __a) {}
__tuple_leaf(__tuple_leaf const &) = default;
__tuple_leaf(__tuple_leaf &&) = default;
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY
__tuple_leaf&
operator=(_Tp&& __t) _NOEXCEPT_((is_nothrow_assignable<_Hp&, _Tp>::value))
{
_Hp::operator=(_VSTD::forward<_Tp>(__t));
return *this;
}
_LIBCPP_INLINE_VISIBILITY
int
swap(__tuple_leaf& __t) _NOEXCEPT_(__is_nothrow_swappable<__tuple_leaf>::value)
{
_VSTD::swap(*this, __t);
return 0;
}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 _Hp& get() _NOEXCEPT {return static_cast<_Hp&>(*this);}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11 const _Hp& get() const _NOEXCEPT {return static_cast<const _Hp&>(*this);}
};
template <class ..._Tp>
_LIBCPP_INLINE_VISIBILITY
void __swallow(_Tp&&...) _NOEXCEPT {}
template <bool ..._Pred>
struct __all
: is_same<__all<_Pred...>, __all<(_Pred, true)...>>
{ };
template <class ..._Tp>
struct __lazy_all : __all<_Tp::value...> {};
template <class _Tp>
struct __all_default_constructible;
template <class ..._Tp>
struct __all_default_constructible<__tuple_types<_Tp...>>
: __all<is_default_constructible<_Tp>::value...>
{ };
// __tuple_impl
template<class _Indx, class ..._Tp> struct __tuple_impl;
template<size_t ..._Indx, class ..._Tp>
struct __tuple_impl<__tuple_indices<_Indx...>, _Tp...>
: public __tuple_leaf<_Indx, _Tp>...
{
_LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR __tuple_impl()
_NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {}
template <size_t ..._Uf, class ..._Tf,
size_t ..._Ul, class ..._Tl, class ..._Up>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
explicit
__tuple_impl(__tuple_indices<_Uf...>, __tuple_types<_Tf...>,
__tuple_indices<_Ul...>, __tuple_types<_Tl...>,
_Up&&... __u)
_NOEXCEPT_((__all<is_nothrow_constructible<_Tf, _Up>::value...>::value &&
__all<is_nothrow_default_constructible<_Tl>::value...>::value)) :
__tuple_leaf<_Uf, _Tf>(_VSTD::forward<_Up>(__u))...,
__tuple_leaf<_Ul, _Tl>()...
{}
template <class _Alloc, size_t ..._Uf, class ..._Tf,
size_t ..._Ul, class ..._Tl, class ..._Up>
_LIBCPP_INLINE_VISIBILITY
explicit
__tuple_impl(allocator_arg_t, const _Alloc& __a,
__tuple_indices<_Uf...>, __tuple_types<_Tf...>,
__tuple_indices<_Ul...>, __tuple_types<_Tl...>,
_Up&&... __u) :
__tuple_leaf<_Uf, _Tf>(__uses_alloc_ctor<_Tf, _Alloc, _Up>(), __a,
_VSTD::forward<_Up>(__u))...,
__tuple_leaf<_Ul, _Tl>(__uses_alloc_ctor<_Tl, _Alloc>(), __a)...
{}
template <class _Tuple,
class = typename enable_if
<
__tuple_constructible<_Tuple, tuple<_Tp...> >::value
>::type
>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
__tuple_impl(_Tuple&& __t) _NOEXCEPT_((__all<is_nothrow_constructible<_Tp, typename tuple_element<_Indx,
typename __make_tuple_types<_Tuple>::type>::type>::value...>::value))
: __tuple_leaf<_Indx, _Tp>(_VSTD::forward<typename tuple_element<_Indx,
typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))...
{}
template <class _Alloc, class _Tuple,
class = typename enable_if
<
__tuple_constructible<_Tuple, tuple<_Tp...> >::value
>::type
>
_LIBCPP_INLINE_VISIBILITY
__tuple_impl(allocator_arg_t, const _Alloc& __a, _Tuple&& __t)
: __tuple_leaf<_Indx, _Tp>(__uses_alloc_ctor<_Tp, _Alloc, typename tuple_element<_Indx,
typename __make_tuple_types<_Tuple>::type>::type>(), __a,
_VSTD::forward<typename tuple_element<_Indx,
typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))...
{}
template <class _Tuple>
_LIBCPP_INLINE_VISIBILITY
typename enable_if
<
__tuple_assignable<_Tuple, tuple<_Tp...> >::value,
__tuple_impl&
>::type
operator=(_Tuple&& __t) _NOEXCEPT_((__all<is_nothrow_assignable<_Tp&, typename tuple_element<_Indx,
typename __make_tuple_types<_Tuple>::type>::type>::value...>::value))
{
__swallow(__tuple_leaf<_Indx, _Tp>::operator=(_VSTD::forward<typename tuple_element<_Indx,
typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<_Indx>(__t)))...);
return *this;
}
__tuple_impl(const __tuple_impl&) = default;
__tuple_impl(__tuple_impl&&) = default;
_LIBCPP_INLINE_VISIBILITY
__tuple_impl&
operator=(const __tuple_impl& __t) _NOEXCEPT_((__all<is_nothrow_copy_assignable<_Tp>::value...>::value))
{
__swallow(__tuple_leaf<_Indx, _Tp>::operator=(static_cast<const __tuple_leaf<_Indx, _Tp>&>(__t).get())...);
return *this;
}
_LIBCPP_INLINE_VISIBILITY
__tuple_impl&
operator=(__tuple_impl&& __t) _NOEXCEPT_((__all<is_nothrow_move_assignable<_Tp>::value...>::value))
{
__swallow(__tuple_leaf<_Indx, _Tp>::operator=(_VSTD::forward<_Tp>(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t).get()))...);
return *this;
}
_LIBCPP_INLINE_VISIBILITY
void swap(__tuple_impl& __t)
_NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value)
{
__swallow(__tuple_leaf<_Indx, _Tp>::swap(static_cast<__tuple_leaf<_Indx, _Tp>&>(__t))...);
}
};
template <bool _IsTuple, class _SizeTrait, size_t _Expected>
struct __tuple_like_with_size_imp : false_type {};
template <class _SizeTrait, size_t _Expected>
struct __tuple_like_with_size_imp<true, _SizeTrait, _Expected>
: integral_constant<bool, _SizeTrait::value == _Expected> {};
template <class _Tuple, size_t _ExpectedSize,
class _RawTuple = typename __uncvref<_Tuple>::type>
using __tuple_like_with_size = __tuple_like_with_size_imp<
__tuple_like<_RawTuple>::value,
tuple_size<_RawTuple>, _ExpectedSize
>;
struct _LIBCPP_TYPE_VIS __check_tuple_constructor_fail {
template <class ...>
static constexpr bool __enable_explicit() { return false; }
template <class ...>
static constexpr bool __enable_implicit() { return false; }
};
template <class ..._Tp>
class _LIBCPP_TYPE_VIS_ONLY tuple
{
typedef __tuple_impl<typename __make_tuple_indices<sizeof...(_Tp)>::type, _Tp...> base;
base base_;
template <class ..._Args>
struct _PackExpandsToThisTuple : false_type {};
template <class _Arg>
struct _PackExpandsToThisTuple<_Arg>
: is_same<typename __uncvref<_Arg>::type, tuple> {};
template <bool _MaybeEnable, class _Dummy = void>
struct _CheckArgsConstructor : __check_tuple_constructor_fail {};
template <class _Dummy>
struct _CheckArgsConstructor<true, _Dummy>
{
template <class ..._Args>
static constexpr bool __enable_explicit() {
return
__tuple_constructible<
tuple<_Args...>,
typename __make_tuple_types<tuple,
sizeof...(_Args) < sizeof...(_Tp) ?
sizeof...(_Args) :
sizeof...(_Tp)>::type
>::value &&
!__tuple_convertible<
tuple<_Args...>,
typename __make_tuple_types<tuple,
sizeof...(_Args) < sizeof...(_Tp) ?
sizeof...(_Args) :
sizeof...(_Tp)>::type
>::value &&
__all_default_constructible<
typename __make_tuple_types<tuple, sizeof...(_Tp),
sizeof...(_Args) < sizeof...(_Tp) ?
sizeof...(_Args) :
sizeof...(_Tp)>::type
>::value;
}
template <class ..._Args>
static constexpr bool __enable_implicit() {
return
__tuple_convertible<
tuple<_Args...>,
typename __make_tuple_types<tuple,
sizeof...(_Args) < sizeof...(_Tp) ?
sizeof...(_Args) :
sizeof...(_Tp)>::type
>::value &&
__all_default_constructible<
typename __make_tuple_types<tuple, sizeof...(_Tp),
sizeof...(_Args) < sizeof...(_Tp) ?
sizeof...(_Args) :
sizeof...(_Tp)>::type
>::value;
}
};
template <bool _MaybeEnable,
bool = sizeof...(_Tp) == 1,
class _Dummy = void>
struct _CheckTupleLikeConstructor : __check_tuple_constructor_fail {};
template <class _Dummy>
struct _CheckTupleLikeConstructor<true, false, _Dummy>
{
template <class _Tuple>
static constexpr bool __enable_implicit() {
return __tuple_convertible<_Tuple, tuple>::value;
}
template <class _Tuple>
static constexpr bool __enable_explicit() {
return __tuple_constructible<_Tuple, tuple>::value
&& !__tuple_convertible<_Tuple, tuple>::value;
}
};
template <class _Dummy>
struct _CheckTupleLikeConstructor<true, true, _Dummy>
{
// This trait is used to disable the tuple-like constructor when
// the UTypes... constructor should be selected instead.
// See LWG issue #2549.
template <class _Tuple>
using _PreferTupleLikeConstructor = __lazy_or<
// Don't attempt the two checks below if the tuple we are given
// has the same type as this tuple.
is_same<typename __uncvref<_Tuple>::type, tuple>,
__lazy_and<
__lazy_not<is_constructible<_Tp..., _Tuple>>,
__lazy_not<is_convertible<_Tuple, _Tp...>>
>
>;
template <class _Tuple>
static constexpr bool __enable_implicit() {
return __lazy_and<
__tuple_convertible<_Tuple, tuple>,
_PreferTupleLikeConstructor<_Tuple>
>::value;
}
template <class _Tuple>
static constexpr bool __enable_explicit() {
return __lazy_and<
__tuple_constructible<_Tuple, tuple>,
_PreferTupleLikeConstructor<_Tuple>,
__lazy_not<__tuple_convertible<_Tuple, tuple>>
>::value;
}
};
template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
typename tuple_element<_Jp, tuple<_Up...> >::type& get(tuple<_Up...>&) _NOEXCEPT;
template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
const typename tuple_element<_Jp, tuple<_Up...> >::type& get(const tuple<_Up...>&) _NOEXCEPT;
template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
typename tuple_element<_Jp, tuple<_Up...> >::type&& get(tuple<_Up...>&&) _NOEXCEPT;
template <size_t _Jp, class ..._Up> friend _LIBCPP_CONSTEXPR_AFTER_CXX11
const typename tuple_element<_Jp, tuple<_Up...> >::type&& get(const tuple<_Up...>&&) _NOEXCEPT;
public:
template <bool _Dummy = true, class = typename enable_if<
__all<__dependent_type<is_default_constructible<_Tp>, _Dummy>::value...>::value
>::type>
_LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR tuple()
_NOEXCEPT_(__all<is_nothrow_default_constructible<_Tp>::value...>::value) {}
template <class _AllocArgT, class _Alloc, bool _Dummy = true, class = typename enable_if<
__lazy_and<
is_base_of<allocator_arg_t, _AllocArgT>,
__lazy_all<__dependent_type<is_default_constructible<_Tp>, _Dummy>...>
>::value
>::type>
_LIBCPP_INLINE_VISIBILITY
tuple(_AllocArgT, _Alloc const& __a)
: base_(allocator_arg_t(), __a,
__tuple_indices<>(), __tuple_types<>(),
typename __make_tuple_indices<sizeof...(_Tp), 0>::type(),
__tuple_types<_Tp...>()) {}
template <bool _Dummy = true,
typename enable_if
<
_CheckArgsConstructor<
_Dummy
>::template __enable_implicit<_Tp...>(),
bool
>::type = false
>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
tuple(const _Tp& ... __t) _NOEXCEPT_((__all<is_nothrow_copy_constructible<_Tp>::value...>::value))
: base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
typename __make_tuple_indices<0>::type(),
typename __make_tuple_types<tuple, 0>::type(),
__t...
) {}
template <bool _Dummy = true,
typename enable_if
<
_CheckArgsConstructor<
_Dummy
>::template __enable_explicit<_Tp...>(),
bool
>::type = false
>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
explicit tuple(const _Tp& ... __t) _NOEXCEPT_((__all<is_nothrow_copy_constructible<_Tp>::value...>::value))
: base_(typename __make_tuple_indices<sizeof...(_Tp)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
typename __make_tuple_indices<0>::type(),
typename __make_tuple_types<tuple, 0>::type(),
__t...
) {}
template <class _Alloc, bool _Dummy = true,
typename enable_if
<
_CheckArgsConstructor<
_Dummy
>::template __enable_implicit<_Tp...>(),
bool
>::type = false
>
_LIBCPP_INLINE_VISIBILITY
tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t)
: base_(allocator_arg_t(), __a,
typename __make_tuple_indices<sizeof...(_Tp)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
typename __make_tuple_indices<0>::type(),
typename __make_tuple_types<tuple, 0>::type(),
__t...
) {}
template <class _Alloc, bool _Dummy = true,
typename enable_if
<
_CheckArgsConstructor<
_Dummy
>::template __enable_explicit<_Tp...>(),
bool
>::type = false
>
_LIBCPP_INLINE_VISIBILITY
explicit
tuple(allocator_arg_t, const _Alloc& __a, const _Tp& ... __t)
: base_(allocator_arg_t(), __a,
typename __make_tuple_indices<sizeof...(_Tp)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Tp)>::type(),
typename __make_tuple_indices<0>::type(),
typename __make_tuple_types<tuple, 0>::type(),
__t...
) {}
template <class ..._Up,
typename enable_if
<
_CheckArgsConstructor<
sizeof...(_Up) <= sizeof...(_Tp)
&& !_PackExpandsToThisTuple<_Up...>::value
>::template __enable_implicit<_Up...>(),
bool
>::type = false
>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
tuple(_Up&&... __u)
_NOEXCEPT_((
is_nothrow_constructible<base,
typename __make_tuple_indices<sizeof...(_Up)>::type,
typename __make_tuple_types<tuple, sizeof...(_Up)>::type,
typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type,
typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type,
_Up...
>::value
))
: base_(typename __make_tuple_indices<sizeof...(_Up)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
_VSTD::forward<_Up>(__u)...) {}
template <class ..._Up,
typename enable_if
<
_CheckArgsConstructor<
sizeof...(_Up) <= sizeof...(_Tp)
&& !_PackExpandsToThisTuple<_Up...>::value
>::template __enable_explicit<_Up...>(),
bool
>::type = false
>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
explicit
tuple(_Up&&... __u)
_NOEXCEPT_((
is_nothrow_constructible<base,
typename __make_tuple_indices<sizeof...(_Up)>::type,
typename __make_tuple_types<tuple, sizeof...(_Up)>::type,
typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type,
typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type,
_Up...
>::value
))
: base_(typename __make_tuple_indices<sizeof...(_Up)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
_VSTD::forward<_Up>(__u)...) {}
template <class _Alloc, class ..._Up,
typename enable_if
<
_CheckArgsConstructor<
sizeof...(_Up) == sizeof...(_Tp) &&
!_PackExpandsToThisTuple<_Up...>::value
>::template __enable_implicit<_Up...>(),
bool
>::type = false
>
_LIBCPP_INLINE_VISIBILITY
tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u)
: base_(allocator_arg_t(), __a,
typename __make_tuple_indices<sizeof...(_Up)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
_VSTD::forward<_Up>(__u)...) {}
template <class _Alloc, class ..._Up,
typename enable_if
<
_CheckArgsConstructor<
sizeof...(_Up) == sizeof...(_Tp) &&
!_PackExpandsToThisTuple<_Up...>::value
>::template __enable_explicit<_Up...>(),
bool
>::type = false
>
_LIBCPP_INLINE_VISIBILITY
explicit
tuple(allocator_arg_t, const _Alloc& __a, _Up&&... __u)
: base_(allocator_arg_t(), __a,
typename __make_tuple_indices<sizeof...(_Up)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Up)>::type(),
typename __make_tuple_indices<sizeof...(_Tp), sizeof...(_Up)>::type(),
typename __make_tuple_types<tuple, sizeof...(_Tp), sizeof...(_Up)>::type(),
_VSTD::forward<_Up>(__u)...) {}
template <class _Tuple,
typename enable_if
<
_CheckTupleLikeConstructor<
__tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value
&& !_PackExpandsToThisTuple<_Tuple>::value
>::template __enable_implicit<_Tuple>(),
bool
>::type = false
>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<base, _Tuple>::value))
: base_(_VSTD::forward<_Tuple>(__t)) {}
template <class _Tuple,
typename enable_if
<
_CheckTupleLikeConstructor<
__tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value
&& !_PackExpandsToThisTuple<_Tuple>::value
>::template __enable_explicit<_Tuple>(),
bool
>::type = false
>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
explicit
tuple(_Tuple&& __t) _NOEXCEPT_((is_nothrow_constructible<base, _Tuple>::value))
: base_(_VSTD::forward<_Tuple>(__t)) {}
template <class _Alloc, class _Tuple,
typename enable_if
<
_CheckTupleLikeConstructor<
__tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value
>::template __enable_implicit<_Tuple>(),
bool
>::type = false
>
_LIBCPP_INLINE_VISIBILITY
tuple(allocator_arg_t, const _Alloc& __a, _Tuple&& __t)
: base_(allocator_arg_t(), __a, _VSTD::forward<_Tuple>(__t)) {}
template <class _Alloc, class _Tuple,
typename enable_if
<
_CheckTupleLikeConstructor<
__tuple_like_with_size<_Tuple, sizeof...(_Tp)>::value
>::template __enable_explicit<_Tuple>(),
bool
>::type = false
>
_LIBCPP_INLINE_VISIBILITY
explicit
tuple(allocator_arg_t, const _Alloc& __a, _Tuple&& __t)
: base_(allocator_arg_t(), __a, _VSTD::forward<_Tuple>(__t)) {}
template <class _Tuple,
class = typename enable_if
<
__tuple_assignable<_Tuple, tuple>::value
>::type
>
_LIBCPP_INLINE_VISIBILITY
tuple&
operator=(_Tuple&& __t) _NOEXCEPT_((is_nothrow_assignable<base&, _Tuple>::value))
{
base_.operator=(_VSTD::forward<_Tuple>(__t));
return *this;
}
_LIBCPP_INLINE_VISIBILITY
void swap(tuple& __t) _NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value)
{base_.swap(__t.base_);}
};
template <>
class _LIBCPP_TYPE_VIS_ONLY tuple<>
{
public:
_LIBCPP_INLINE_VISIBILITY
_LIBCPP_CONSTEXPR tuple() _NOEXCEPT {}
template <class _Alloc>
_LIBCPP_INLINE_VISIBILITY
tuple(allocator_arg_t, const _Alloc&) _NOEXCEPT {}
template <class _Alloc>
_LIBCPP_INLINE_VISIBILITY
tuple(allocator_arg_t, const _Alloc&, const tuple&) _NOEXCEPT {}
template <class _Up>
_LIBCPP_INLINE_VISIBILITY
tuple(array<_Up, 0>) _NOEXCEPT {}
template <class _Alloc, class _Up>
_LIBCPP_INLINE_VISIBILITY
tuple(allocator_arg_t, const _Alloc&, array<_Up, 0>) _NOEXCEPT {}
_LIBCPP_INLINE_VISIBILITY
void swap(tuple&) _NOEXCEPT {}
};
template <class ..._Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
__all<__is_swappable<_Tp>::value...>::value,
void
>::type
swap(tuple<_Tp...>& __t, tuple<_Tp...>& __u)
_NOEXCEPT_(__all<__is_nothrow_swappable<_Tp>::value...>::value)
{__t.swap(__u);}
// get
template <size_t _Ip, class ..._Tp>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
typename tuple_element<_Ip, tuple<_Tp...> >::type&
get(tuple<_Tp...>& __t) _NOEXCEPT
{
typedef typename tuple_element<_Ip, tuple<_Tp...> >::type type;
return static_cast<__tuple_leaf<_Ip, type>&>(__t.base_).get();
}
template <size_t _Ip, class ..._Tp>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
const typename tuple_element<_Ip, tuple<_Tp...> >::type&
get(const tuple<_Tp...>& __t) _NOEXCEPT
{
typedef typename tuple_element<_Ip, tuple<_Tp...> >::type type;
return static_cast<const __tuple_leaf<_Ip, type>&>(__t.base_).get();
}
template <size_t _Ip, class ..._Tp>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
typename tuple_element<_Ip, tuple<_Tp...> >::type&&
get(tuple<_Tp...>&& __t) _NOEXCEPT
{
typedef typename tuple_element<_Ip, tuple<_Tp...> >::type type;
return static_cast<type&&>(
static_cast<__tuple_leaf<_Ip, type>&&>(__t.base_).get());
}
template <size_t _Ip, class ..._Tp>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
const typename tuple_element<_Ip, tuple<_Tp...> >::type&&
get(const tuple<_Tp...>&& __t) _NOEXCEPT
{
typedef typename tuple_element<_Ip, tuple<_Tp...> >::type type;
return static_cast<const type&&>(
static_cast<const __tuple_leaf<_Ip, type>&&>(__t.base_).get());
}
#if _LIBCPP_STD_VER > 11
// get by type
template <typename _T1, size_t _Idx, typename... _Args>
struct __find_exactly_one_t_helper;
// -- find exactly one
template <typename _T1, size_t _Idx, typename... _Args>
struct __find_exactly_one_t_checker {
static constexpr size_t value = _Idx;
// Check the rest of the list to make sure there's only one
static_assert ( __find_exactly_one_t_helper<_T1, 0, _Args...>::value == -1, "type can only occur once in type list" );
};
template <typename _T1, size_t _Idx>
struct __find_exactly_one_t_helper <_T1, _Idx> {
static constexpr size_t value = -1;
};
template <typename _T1, size_t _Idx, typename _Head, typename... _Args>
struct __find_exactly_one_t_helper <_T1, _Idx, _Head, _Args...> {
static constexpr size_t value =
std::conditional<
std::is_same<_T1, _Head>::value,
__find_exactly_one_t_checker<_T1, _Idx, _Args...>,
__find_exactly_one_t_helper <_T1, _Idx+1, _Args...>
>::type::value;
};
template <typename _T1, typename... _Args>
struct __find_exactly_one_t {
static constexpr size_t value = __find_exactly_one_t_helper<_T1, 0, _Args...>::value;
static_assert ( value != -1, "type not found in type list" );
};
template <class _T1, class... _Args>
inline _LIBCPP_INLINE_VISIBILITY
constexpr _T1& get(tuple<_Args...>& __tup) noexcept
{
return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup);
}
template <class _T1, class... _Args>
inline _LIBCPP_INLINE_VISIBILITY
constexpr _T1 const& get(tuple<_Args...> const& __tup) noexcept
{
return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(__tup);
}
template <class _T1, class... _Args>
inline _LIBCPP_INLINE_VISIBILITY
constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept
{
return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup));
}
template <class _T1, class... _Args>
inline _LIBCPP_INLINE_VISIBILITY
constexpr _T1 const&& get(tuple<_Args...> const&& __tup) noexcept
{
return _VSTD::get<__find_exactly_one_t<_T1, _Args...>::value>(_VSTD::move(__tup));
}
#endif
// tie
template <class ..._Tp>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
tuple<_Tp&...>
tie(_Tp&... __t) _NOEXCEPT
{
return tuple<_Tp&...>(__t...);
}
template <class _Up>
struct __ignore_t
{
template <class _Tp>
_LIBCPP_INLINE_VISIBILITY
const __ignore_t& operator=(_Tp&&) const {return *this;}
};
namespace { const __ignore_t<unsigned char> ignore = __ignore_t<unsigned char>(); }
template <class _Tp>
struct __make_tuple_return_impl
{
typedef _Tp type;
};
template <class _Tp>
struct __make_tuple_return_impl<reference_wrapper<_Tp> >
{
typedef _Tp& type;
};
template <class _Tp>
struct __make_tuple_return
{
typedef typename __make_tuple_return_impl<typename decay<_Tp>::type>::type type;
};
template <class... _Tp>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
tuple<typename __make_tuple_return<_Tp>::type...>
make_tuple(_Tp&&... __t)
{
return tuple<typename __make_tuple_return<_Tp>::type...>(_VSTD::forward<_Tp>(__t)...);
}
template <class... _Tp>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
tuple<_Tp&&...>
forward_as_tuple(_Tp&&... __t) _NOEXCEPT
{
return tuple<_Tp&&...>(_VSTD::forward<_Tp>(__t)...);
}
template <size_t _Ip>
struct __tuple_equal
{
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
bool operator()(const _Tp& __x, const _Up& __y)
{
return __tuple_equal<_Ip - 1>()(__x, __y) && _VSTD::get<_Ip-1>(__x) == _VSTD::get<_Ip-1>(__y);
}
};
template <>
struct __tuple_equal<0>
{
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
bool operator()(const _Tp&, const _Up&)
{
return true;
}
};
template <class ..._Tp, class ..._Up>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
bool
operator==(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
{
return __tuple_equal<sizeof...(_Tp)>()(__x, __y);
}
template <class ..._Tp, class ..._Up>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
bool
operator!=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
{
return !(__x == __y);
}
template <size_t _Ip>
struct __tuple_less
{
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
bool operator()(const _Tp& __x, const _Up& __y)
{
const size_t __idx = tuple_size<_Tp>::value - _Ip;
if (_VSTD::get<__idx>(__x) < _VSTD::get<__idx>(__y))
return true;
if (_VSTD::get<__idx>(__y) < _VSTD::get<__idx>(__x))
return false;
return __tuple_less<_Ip-1>()(__x, __y);
}
};
template <>
struct __tuple_less<0>
{
template <class _Tp, class _Up>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
bool operator()(const _Tp&, const _Up&)
{
return false;
}
};
template <class ..._Tp, class ..._Up>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
bool
operator<(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
{
return __tuple_less<sizeof...(_Tp)>()(__x, __y);
}
template <class ..._Tp, class ..._Up>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
bool
operator>(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
{
return __y < __x;
}
template <class ..._Tp, class ..._Up>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
bool
operator>=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
{
return !(__x < __y);
}
template <class ..._Tp, class ..._Up>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
bool
operator<=(const tuple<_Tp...>& __x, const tuple<_Up...>& __y)
{
return !(__y < __x);
}
// tuple_cat
template <class _Tp, class _Up> struct __tuple_cat_type;
template <class ..._Ttypes, class ..._Utypes>
struct __tuple_cat_type<tuple<_Ttypes...>, __tuple_types<_Utypes...> >
{
typedef tuple<_Ttypes..., _Utypes...> type;
};
template <class _ResultTuple, bool _Is_Tuple0TupleLike, class ..._Tuples>
struct __tuple_cat_return_1
{
};
template <class ..._Types, class _Tuple0>
struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0>
{
typedef typename __tuple_cat_type<tuple<_Types...>,
typename __make_tuple_types<typename remove_reference<_Tuple0>::type>::type>::type
type;
};
template <class ..._Types, class _Tuple0, class _Tuple1, class ..._Tuples>
struct __tuple_cat_return_1<tuple<_Types...>, true, _Tuple0, _Tuple1, _Tuples...>
: public __tuple_cat_return_1<
typename __tuple_cat_type<
tuple<_Types...>,
typename __make_tuple_types<typename remove_reference<_Tuple0>::type>::type
>::type,
__tuple_like<typename remove_reference<_Tuple1>::type>::value,
_Tuple1, _Tuples...>
{
};
template <class ..._Tuples> struct __tuple_cat_return;
template <class _Tuple0, class ..._Tuples>
struct __tuple_cat_return<_Tuple0, _Tuples...>
: public __tuple_cat_return_1<tuple<>,
__tuple_like<typename remove_reference<_Tuple0>::type>::value, _Tuple0,
_Tuples...>
{
};
template <>
struct __tuple_cat_return<>
{
typedef tuple<> type;
};
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
tuple<>
tuple_cat()
{
return tuple<>();
}
template <class _Rp, class _Indices, class _Tuple0, class ..._Tuples>
struct __tuple_cat_return_ref_imp;
template <class ..._Types, size_t ..._I0, class _Tuple0>
struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>, _Tuple0>
{
typedef typename remove_reference<_Tuple0>::type _T0;
typedef tuple<_Types..., typename __apply_cv<_Tuple0,
typename tuple_element<_I0, _T0>::type>::type&&...> type;
};
template <class ..._Types, size_t ..._I0, class _Tuple0, class _Tuple1, class ..._Tuples>
struct __tuple_cat_return_ref_imp<tuple<_Types...>, __tuple_indices<_I0...>,
_Tuple0, _Tuple1, _Tuples...>
: public __tuple_cat_return_ref_imp<
tuple<_Types..., typename __apply_cv<_Tuple0,
typename tuple_element<_I0,
typename remove_reference<_Tuple0>::type>::type>::type&&...>,
typename __make_tuple_indices<tuple_size<typename
remove_reference<_Tuple1>::type>::value>::type,
_Tuple1, _Tuples...>
{
};
template <class _Tuple0, class ..._Tuples>
struct __tuple_cat_return_ref
: public __tuple_cat_return_ref_imp<tuple<>,
typename __make_tuple_indices<
tuple_size<typename remove_reference<_Tuple0>::type>::value
>::type, _Tuple0, _Tuples...>
{
};
template <class _Types, class _I0, class _J0>
struct __tuple_cat;
template <class ..._Types, size_t ..._I0, size_t ..._J0>
struct __tuple_cat<tuple<_Types...>, __tuple_indices<_I0...>, __tuple_indices<_J0...> >
{
template <class _Tuple0>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&>::type
operator()(tuple<_Types...> __t, _Tuple0&& __t0)
{
return forward_as_tuple(_VSTD::forward<_Types>(_VSTD::get<_I0>(__t))...,
_VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))...);
}
template <class _Tuple0, class _Tuple1, class ..._Tuples>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
typename __tuple_cat_return_ref<tuple<_Types...>&&, _Tuple0&&, _Tuple1&&, _Tuples&&...>::type
operator()(tuple<_Types...> __t, _Tuple0&& __t0, _Tuple1&& __t1, _Tuples&& ...__tpls)
{
typedef typename remove_reference<_Tuple0>::type _T0;
typedef typename remove_reference<_Tuple1>::type _T1;
return __tuple_cat<
tuple<_Types..., typename __apply_cv<_Tuple0, typename tuple_element<_J0, _T0>::type>::type&&...>,
typename __make_tuple_indices<sizeof ...(_Types) + tuple_size<_T0>::value>::type,
typename __make_tuple_indices<tuple_size<_T1>::value>::type>()
(forward_as_tuple(
_VSTD::forward<_Types>(_VSTD::get<_I0>(__t))...,
_VSTD::get<_J0>(_VSTD::forward<_Tuple0>(__t0))...
),
_VSTD::forward<_Tuple1>(__t1),
_VSTD::forward<_Tuples>(__tpls)...);
}
};
template <class _Tuple0, class... _Tuples>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
typename __tuple_cat_return<_Tuple0, _Tuples...>::type
tuple_cat(_Tuple0&& __t0, _Tuples&&... __tpls)
{
typedef typename remove_reference<_Tuple0>::type _T0;
return __tuple_cat<tuple<>, __tuple_indices<>,
typename __make_tuple_indices<tuple_size<_T0>::value>::type>()
(tuple<>(), _VSTD::forward<_Tuple0>(__t0),
_VSTD::forward<_Tuples>(__tpls)...);
}
template <class ..._Tp, class _Alloc>
struct _LIBCPP_TYPE_VIS_ONLY uses_allocator<tuple<_Tp...>, _Alloc>
: true_type {};
template <class _T1, class _T2>
template <class... _Args1, class... _Args2, size_t ..._I1, size_t ..._I2>
inline _LIBCPP_INLINE_VISIBILITY
pair<_T1, _T2>::pair(piecewise_construct_t,
tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args,
__tuple_indices<_I1...>, __tuple_indices<_I2...>)
: first(_VSTD::forward<_Args1>(_VSTD::get<_I1>( __first_args))...),
second(_VSTD::forward<_Args2>(_VSTD::get<_I2>(__second_args))...)
{
}
#endif // _LIBCPP_HAS_NO_VARIADICS
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_TUPLE