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freebsd/contrib/libc++/include/utility
Dimitry Andric 7c82a1ece4 Update libc++ to release_39 branch r279689.
2016-08-30 18:27:31 +00:00

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// -*- C++ -*-
//===-------------------------- utility -----------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP_UTILITY
#define _LIBCPP_UTILITY
/*
utility synopsis
namespace std
{
template <class T>
void
swap(T& a, T& b);
namespace rel_ops
{
template<class T> bool operator!=(const T&, const T&);
template<class T> bool operator> (const T&, const T&);
template<class T> bool operator<=(const T&, const T&);
template<class T> bool operator>=(const T&, const T&);
}
template<class T>
void
swap(T& a, T& b) noexcept(is_nothrow_move_constructible<T>::value &&
is_nothrow_move_assignable<T>::value);
template <class T, size_t N>
void
swap(T (&a)[N], T (&b)[N]) noexcept(noexcept(swap(*a, *b)));
template <class T> T&& forward(typename remove_reference<T>::type& t) noexcept; // constexpr in C++14
template <class T> T&& forward(typename remove_reference<T>::type&& t) noexcept; // constexpr in C++14
template <class T> typename remove_reference<T>::type&& move(T&&) noexcept; // constexpr in C++14
template <class T>
typename conditional
<
!is_nothrow_move_constructible<T>::value && is_copy_constructible<T>::value,
const T&,
T&&
>::type
move_if_noexcept(T& x) noexcept; // constexpr in C++14
template <class T> constexpr add_const<T>_t& as_const(T& t) noexcept; // C++17
template <class T> void as_const(const T&&) = delete; // C++17
template <class T> typename add_rvalue_reference<T>::type declval() noexcept;
template <class T1, class T2>
struct pair
{
typedef T1 first_type;
typedef T2 second_type;
T1 first;
T2 second;
pair(const pair&) = default;
pair(pair&&) = default;
constexpr pair();
pair(const T1& x, const T2& y); // constexpr in C++14
template <class U, class V> pair(U&& x, V&& y); // constexpr in C++14
template <class U, class V> pair(const pair<U, V>& p); // constexpr in C++14
template <class U, class V> pair(pair<U, V>&& p); // constexpr in C++14
template <class... Args1, class... Args2>
pair(piecewise_construct_t, tuple<Args1...> first_args,
tuple<Args2...> second_args);
template <class U, class V> pair& operator=(const pair<U, V>& p);
pair& operator=(pair&& p) noexcept(is_nothrow_move_assignable<T1>::value &&
is_nothrow_move_assignable<T2>::value);
template <class U, class V> pair& operator=(pair<U, V>&& p);
void swap(pair& p) noexcept(is_nothrow_swappable_v<T1> &&
is_nothrow_swappable_v<T2>);
};
template <class T1, class T2> bool operator==(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
template <class T1, class T2> bool operator!=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
template <class T1, class T2> bool operator< (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
template <class T1, class T2> bool operator> (const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
template <class T1, class T2> bool operator>=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
template <class T1, class T2> bool operator<=(const pair<T1,T2>&, const pair<T1,T2>&); // constexpr in C++14
template <class T1, class T2> pair<V1, V2> make_pair(T1&&, T2&&); // constexpr in C++14
template <class T1, class T2>
void
swap(pair<T1, T2>& x, pair<T1, T2>& y) noexcept(noexcept(x.swap(y)));
struct piecewise_construct_t { };
constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
template <class T> class tuple_size;
template <size_t I, class T> class tuple_element;
template <class T1, class T2> struct tuple_size<pair<T1, T2> >;
template <class T1, class T2> struct tuple_element<0, pair<T1, T2> >;
template <class T1, class T2> struct tuple_element<1, pair<T1, T2> >;
template<size_t I, class T1, class T2>
typename tuple_element<I, pair<T1, T2> >::type&
get(pair<T1, T2>&) noexcept; // constexpr in C++14
template<size_t I, class T1, class T2>
const typename tuple_element<I, pair<T1, T2> >::type&
get(const pair<T1, T2>&) noexcept; // constexpr in C++14
template<size_t I, class T1, class T2>
typename tuple_element<I, pair<T1, T2> >::type&&
get(pair<T1, T2>&&) noexcept; // constexpr in C++14
template<size_t I, class T1, class T2>
const typename tuple_element<I, pair<T1, T2> >::type&&
get(const pair<T1, T2>&&) noexcept; // constexpr in C++14
template<class T1, class T2>
constexpr T1& get(pair<T1, T2>&) noexcept; // C++14
template<class T1, class T2>
constexpr const T1& get(const pair<T1, T2>&) noexcept; // C++14
template<class T1, class T2>
constexpr T1&& get(pair<T1, T2>&&) noexcept; // C++14
template<class T1, class T2>
constexpr const T1&& get(const pair<T1, T2>&&) noexcept; // C++14
template<class T1, class T2>
constexpr T1& get(pair<T2, T1>&) noexcept; // C++14
template<class T1, class T2>
constexpr const T1& get(const pair<T2, T1>&) noexcept; // C++14
template<class T1, class T2>
constexpr T1&& get(pair<T2, T1>&&) noexcept; // C++14
template<class T1, class T2>
constexpr const T1&& get(const pair<T2, T1>&&) noexcept; // C++14
// C++14
template<class T, T... I>
struct integer_sequence
{
typedef T value_type;
static constexpr size_t size() noexcept;
};
template<size_t... I>
using index_sequence = integer_sequence<size_t, I...>;
template<class T, T N>
using make_integer_sequence = integer_sequence<T, 0, 1, ..., N-1>;
template<size_t N>
using make_index_sequence = make_integer_sequence<size_t, N>;
template<class... T>
using index_sequence_for = make_index_sequence<sizeof...(T)>;
template<class T, class U=T>
T exchange(T& obj, U&& new_value);
} // std
*/
#include <__config>
#include <__tuple>
#include <type_traits>
#include <initializer_list>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
namespace rel_ops
{
template<class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator!=(const _Tp& __x, const _Tp& __y)
{
return !(__x == __y);
}
template<class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator> (const _Tp& __x, const _Tp& __y)
{
return __y < __x;
}
template<class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator<=(const _Tp& __x, const _Tp& __y)
{
return !(__y < __x);
}
template<class _Tp>
inline _LIBCPP_INLINE_VISIBILITY
bool
operator>=(const _Tp& __x, const _Tp& __y)
{
return !(__x < __y);
}
} // rel_ops
// swap_ranges
template <class _ForwardIterator1, class _ForwardIterator2>
inline _LIBCPP_INLINE_VISIBILITY
_ForwardIterator2
swap_ranges(_ForwardIterator1 __first1, _ForwardIterator1 __last1, _ForwardIterator2 __first2)
{
for(; __first1 != __last1; ++__first1, (void) ++__first2)
swap(*__first1, *__first2);
return __first2;
}
// forward declared in <type_traits>
template<class _Tp, size_t _Np>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if<
__is_swappable<_Tp>::value
>::type
swap(_Tp (&__a)[_Np], _Tp (&__b)[_Np]) _NOEXCEPT_(__is_nothrow_swappable<_Tp>::value)
{
_VSTD::swap_ranges(__a, __a + _Np, __b);
}
template <class _Tp>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
typename conditional
<
!is_nothrow_move_constructible<_Tp>::value && is_copy_constructible<_Tp>::value,
const _Tp&,
_Tp&&
>::type
#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
const _Tp&
#endif
move_if_noexcept(_Tp& __x) _NOEXCEPT
{
return _VSTD::move(__x);
}
#if _LIBCPP_STD_VER > 14
template <class _Tp> constexpr add_const_t<_Tp>& as_const(_Tp& __t) noexcept { return __t; }
template <class _Tp> void as_const(const _Tp&&) = delete;
#endif
struct _LIBCPP_TYPE_VIS_ONLY piecewise_construct_t { };
#if defined(_LIBCPP_HAS_NO_CONSTEXPR) || defined(_LIBCPP_BUILDING_UTILITY)
extern const piecewise_construct_t piecewise_construct;// = piecewise_construct_t();
#else
constexpr piecewise_construct_t piecewise_construct = piecewise_construct_t();
#endif
template <class _T1, class _T2>
struct _LIBCPP_TYPE_VIS_ONLY pair
{
typedef _T1 first_type;
typedef _T2 second_type;
_T1 first;
_T2 second;
#ifndef _LIBCPP_HAS_NO_DEFAULT_FUNCTION_TEMPLATE_ARGS
template <bool _Dummy = true, class = typename enable_if<
__dependent_type<is_default_constructible<_T1>, _Dummy>::value &&
__dependent_type<is_default_constructible<_T2>, _Dummy>::value
>::type>
#endif
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR pair() : first(), second() {}
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
pair(const _T1& __x, const _T2& __y)
: first(__x), second(__y) {}
template<class _U1, class _U2>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
pair(const pair<_U1, _U2>& __p
#ifndef _LIBCPP_HAS_NO_ADVANCED_SFINAE
,typename enable_if<is_convertible<const _U1&, _T1>::value &&
is_convertible<const _U2&, _T2>::value>::type* = 0
#endif
)
: first(__p.first), second(__p.second) {}
#if defined(_LIBCPP_DEPRECATED_ABI_DISABLE_PAIR_TRIVIAL_COPY_CTOR)
_LIBCPP_INLINE_VISIBILITY
pair(const pair& __p)
_NOEXCEPT_(is_nothrow_copy_constructible<first_type>::value &&
is_nothrow_copy_constructible<second_type>::value)
: first(__p.first),
second(__p.second)
{
}
# ifndef _LIBCPP_CXX03_LANG
_LIBCPP_INLINE_VISIBILITY
pair(pair&& __p) _NOEXCEPT_(is_nothrow_move_constructible<first_type>::value &&
is_nothrow_move_constructible<second_type>::value)
: first(_VSTD::forward<first_type>(__p.first)),
second(_VSTD::forward<second_type>(__p.second))
{
}
# endif
#elif !defined(_LIBCPP_CXX03_LANG)
pair(pair const&) = default;
pair(pair&&) = default;
#else
// Use the implicitly declared copy constructor in C++03
#endif
_LIBCPP_INLINE_VISIBILITY
pair& operator=(const pair& __p)
_NOEXCEPT_(is_nothrow_copy_assignable<first_type>::value &&
is_nothrow_copy_assignable<second_type>::value)
{
first = __p.first;
second = __p.second;
return *this;
}
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
template <class _U1, class _U2,
class = typename enable_if<is_convertible<_U1, first_type>::value &&
is_convertible<_U2, second_type>::value>::type>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
pair(_U1&& __u1, _U2&& __u2)
: first(_VSTD::forward<_U1>(__u1)),
second(_VSTD::forward<_U2>(__u2))
{}
template<class _U1, class _U2>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
pair(pair<_U1, _U2>&& __p,
typename enable_if<is_convertible<_U1, _T1>::value &&
is_convertible<_U2, _T2>::value>::type* = 0)
: first(_VSTD::forward<_U1>(__p.first)),
second(_VSTD::forward<_U2>(__p.second)) {}
_LIBCPP_INLINE_VISIBILITY
pair&
operator=(pair&& __p) _NOEXCEPT_(is_nothrow_move_assignable<first_type>::value &&
is_nothrow_move_assignable<second_type>::value)
{
first = _VSTD::forward<first_type>(__p.first);
second = _VSTD::forward<second_type>(__p.second);
return *this;
}
#ifndef _LIBCPP_HAS_NO_VARIADICS
template<class _Tuple,
class = typename enable_if<__tuple_convertible<_Tuple, pair>::value>::type>
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
pair(_Tuple&& __p)
: first(_VSTD::forward<typename tuple_element<0,
typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<0>(__p))),
second(_VSTD::forward<typename tuple_element<1,
typename __make_tuple_types<_Tuple>::type>::type>(_VSTD::get<1>(__p)))
{}
template <class... _Args1, class... _Args2>
_LIBCPP_INLINE_VISIBILITY
pair(piecewise_construct_t __pc, tuple<_Args1...> __first_args,
tuple<_Args2...> __second_args)
: pair(__pc, __first_args, __second_args,
typename __make_tuple_indices<sizeof...(_Args1)>::type(),
typename __make_tuple_indices<sizeof...(_Args2) >::type())
{}
template <class _Tuple,
class = typename enable_if<__tuple_assignable<_Tuple, pair>::value>::type>
_LIBCPP_INLINE_VISIBILITY
pair&
operator=(_Tuple&& __p)
{
typedef typename __make_tuple_types<_Tuple>::type _TupleRef;
typedef typename tuple_element<0, _TupleRef>::type _U0;
typedef typename tuple_element<1, _TupleRef>::type _U1;
first = _VSTD::forward<_U0>(_VSTD::get<0>(__p));
second = _VSTD::forward<_U1>(_VSTD::get<1>(__p));
return *this;
}
#endif // _LIBCPP_HAS_NO_VARIADICS
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
_LIBCPP_INLINE_VISIBILITY
void
swap(pair& __p) _NOEXCEPT_(__is_nothrow_swappable<first_type>::value &&
__is_nothrow_swappable<second_type>::value)
{
using _VSTD::swap;
swap(first, __p.first);
swap(second, __p.second);
}
private:
#ifndef _LIBCPP_HAS_NO_VARIADICS
template <class... _Args1, class... _Args2, size_t... _I1, size_t... _I2>
_LIBCPP_INLINE_VISIBILITY
pair(piecewise_construct_t,
tuple<_Args1...>& __first_args, tuple<_Args2...>& __second_args,
__tuple_indices<_I1...>, __tuple_indices<_I2...>);
#endif // _LIBCPP_HAS_NO_VARIADICS
};
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
bool
operator==(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
{
return __x.first == __y.first && __x.second == __y.second;
}
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
bool
operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
{
return !(__x == __y);
}
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
bool
operator< (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
{
return __x.first < __y.first || (!(__y.first < __x.first) && __x.second < __y.second);
}
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
bool
operator> (const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
{
return __y < __x;
}
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
bool
operator>=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
{
return !(__x < __y);
}
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
bool
operator<=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)
{
return !(__y < __x);
}
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if
<
__is_swappable<_T1>::value &&
__is_swappable<_T2>::value,
void
>::type
swap(pair<_T1, _T2>& __x, pair<_T1, _T2>& __y)
_NOEXCEPT_((__is_nothrow_swappable<_T1>::value &&
__is_nothrow_swappable<_T2>::value))
{
__x.swap(__y);
}
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
template <class _Tp>
struct __make_pair_return_impl
{
typedef _Tp type;
};
template <class _Tp>
struct __make_pair_return_impl<reference_wrapper<_Tp>>
{
typedef _Tp& type;
};
template <class _Tp>
struct __make_pair_return
{
typedef typename __make_pair_return_impl<typename decay<_Tp>::type>::type type;
};
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
make_pair(_T1&& __t1, _T2&& __t2)
{
return pair<typename __make_pair_return<_T1>::type, typename __make_pair_return<_T2>::type>
(_VSTD::forward<_T1>(__t1), _VSTD::forward<_T2>(__t2));
}
#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY
pair<_T1,_T2>
make_pair(_T1 __x, _T2 __y)
{
return pair<_T1, _T2>(__x, __y);
}
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
template <class _T1, class _T2>
class _LIBCPP_TYPE_VIS_ONLY tuple_size<pair<_T1, _T2> >
: public integral_constant<size_t, 2> {};
template <class _T1, class _T2>
class _LIBCPP_TYPE_VIS_ONLY tuple_element<0, pair<_T1, _T2> >
{
public:
typedef _T1 type;
};
template <class _T1, class _T2>
class _LIBCPP_TYPE_VIS_ONLY tuple_element<1, pair<_T1, _T2> >
{
public:
typedef _T2 type;
};
template <size_t _Ip> struct __get_pair;
template <>
struct __get_pair<0>
{
template <class _T1, class _T2>
static
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
_T1&
get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
template <class _T1, class _T2>
static
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
const _T1&
get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.first;}
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
template <class _T1, class _T2>
static
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
_T1&&
get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T1>(__p.first);}
template <class _T1, class _T2>
static
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
const _T1&&
get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<const _T1>(__p.first);}
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
};
template <>
struct __get_pair<1>
{
template <class _T1, class _T2>
static
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
_T2&
get(pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
template <class _T1, class _T2>
static
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
const _T2&
get(const pair<_T1, _T2>& __p) _NOEXCEPT {return __p.second;}
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
template <class _T1, class _T2>
static
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
_T2&&
get(pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<_T2>(__p.second);}
template <class _T1, class _T2>
static
_LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
const _T2&&
get(const pair<_T1, _T2>&& __p) _NOEXCEPT {return _VSTD::forward<const _T2>(__p.second);}
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
};
template <size_t _Ip, class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
typename tuple_element<_Ip, pair<_T1, _T2> >::type&
get(pair<_T1, _T2>& __p) _NOEXCEPT
{
return __get_pair<_Ip>::get(__p);
}
template <size_t _Ip, class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
const typename tuple_element<_Ip, pair<_T1, _T2> >::type&
get(const pair<_T1, _T2>& __p) _NOEXCEPT
{
return __get_pair<_Ip>::get(__p);
}
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
template <size_t _Ip, class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
get(pair<_T1, _T2>&& __p) _NOEXCEPT
{
return __get_pair<_Ip>::get(_VSTD::move(__p));
}
template <size_t _Ip, class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
const typename tuple_element<_Ip, pair<_T1, _T2> >::type&&
get(const pair<_T1, _T2>&& __p) _NOEXCEPT
{
return __get_pair<_Ip>::get(_VSTD::move(__p));
}
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
#if _LIBCPP_STD_VER > 11
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY
constexpr _T1 & get(pair<_T1, _T2>& __p) _NOEXCEPT
{
return __get_pair<0>::get(__p);
}
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY
constexpr _T1 const & get(pair<_T1, _T2> const& __p) _NOEXCEPT
{
return __get_pair<0>::get(__p);
}
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY
constexpr _T1 && get(pair<_T1, _T2>&& __p) _NOEXCEPT
{
return __get_pair<0>::get(_VSTD::move(__p));
}
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY
constexpr _T1 const && get(pair<_T1, _T2> const&& __p) _NOEXCEPT
{
return __get_pair<0>::get(_VSTD::move(__p));
}
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY
constexpr _T1 & get(pair<_T2, _T1>& __p) _NOEXCEPT
{
return __get_pair<1>::get(__p);
}
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY
constexpr _T1 const & get(pair<_T2, _T1> const& __p) _NOEXCEPT
{
return __get_pair<1>::get(__p);
}
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY
constexpr _T1 && get(pair<_T2, _T1>&& __p) _NOEXCEPT
{
return __get_pair<1>::get(_VSTD::move(__p));
}
template <class _T1, class _T2>
inline _LIBCPP_INLINE_VISIBILITY
constexpr _T1 const && get(pair<_T2, _T1> const&& __p) _NOEXCEPT
{
return __get_pair<1>::get(_VSTD::move(__p));
}
#endif
#if _LIBCPP_STD_VER > 11
template<class _Tp, _Tp... _Ip>
struct _LIBCPP_TYPE_VIS_ONLY integer_sequence
{
typedef _Tp value_type;
static_assert( is_integral<_Tp>::value,
"std::integer_sequence can only be instantiated with an integral type" );
static
_LIBCPP_INLINE_VISIBILITY
constexpr
size_t
size() noexcept { return sizeof...(_Ip); }
};
template<size_t... _Ip>
using index_sequence = integer_sequence<size_t, _Ip...>;
#if __has_builtin(__make_integer_seq) && !defined(_LIBCPP_TESTING_FALLBACK_MAKE_INTEGER_SEQUENCE)
template <class _Tp, _Tp _Ep>
using __make_integer_sequence = __make_integer_seq<integer_sequence, _Tp, _Ep>;
#else
template<typename _Tp, _Tp _Np> using __make_integer_sequence_unchecked =
typename __detail::__make<_Np>::type::template __convert<integer_sequence, _Tp>;
template <class _Tp, _Tp _Ep>
struct __make_integer_sequence_checked
{
static_assert(is_integral<_Tp>::value,
"std::make_integer_sequence can only be instantiated with an integral type" );
static_assert(0 <= _Ep, "std::make_integer_sequence must have a non-negative sequence length");
// Workaround GCC bug by preventing bad installations when 0 <= _Ep
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68929
typedef __make_integer_sequence_unchecked<_Tp, 0 <= _Ep ? _Ep : 0> type;
};
template <class _Tp, _Tp _Ep>
using __make_integer_sequence = typename __make_integer_sequence_checked<_Tp, _Ep>::type;
#endif
template<class _Tp, _Tp _Np>
using make_integer_sequence = __make_integer_sequence<_Tp, _Np>;
template<size_t _Np>
using make_index_sequence = make_integer_sequence<size_t, _Np>;
template<class... _Tp>
using index_sequence_for = make_index_sequence<sizeof...(_Tp)>;
#endif // _LIBCPP_STD_VER > 11
#if _LIBCPP_STD_VER > 11
template<class _T1, class _T2 = _T1>
inline _LIBCPP_INLINE_VISIBILITY
_T1 exchange(_T1& __obj, _T2 && __new_value)
{
_T1 __old_value = _VSTD::move(__obj);
__obj = _VSTD::forward<_T2>(__new_value);
return __old_value;
}
#endif // _LIBCPP_STD_VER > 11
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP_UTILITY
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