// <tuple> -*- C++ -*-
-// Copyright (C) 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+// Copyright (C) 2007-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
#pragma GCC system_header
-#ifndef __GXX_EXPERIMENTAL_CXX0X__
+#if __cplusplus < 201103L
# include <bits/c++0x_warning.h>
#else
#include <utility>
+#include <array>
#include <bits/uses_allocator.h>
+#include <bits/invoke.h>
+#if __cplusplus > 201703L
+# include <compare>
+# define __cpp_lib_constexpr_tuple 201811L
+#endif
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
- // Adds a const reference to a non-reference type.
- template<typename _Tp>
- struct __add_c_ref
- { typedef const _Tp& type; };
-
- template<typename _Tp>
- struct __add_c_ref<_Tp&>
- { typedef _Tp& type; };
+ /**
+ * @addtogroup utilities
+ * @{
+ */
- // Adds a reference to a non-reference type.
- template<typename _Tp>
- struct __add_ref
- { typedef _Tp& type; };
+ template<typename... _Elements>
+ class tuple;
template<typename _Tp>
- struct __add_ref<_Tp&>
- { typedef _Tp& type; };
+ struct __is_empty_non_tuple : is_empty<_Tp> { };
- // Adds an rvalue reference to a non-reference type.
- template<typename _Tp>
- struct __add_r_ref
- { typedef _Tp&& type; };
+ // Using EBO for elements that are tuples causes ambiguous base errors.
+ template<typename _El0, typename... _El>
+ struct __is_empty_non_tuple<tuple<_El0, _El...>> : false_type { };
+ // Use the Empty Base-class Optimization for empty, non-final types.
template<typename _Tp>
- struct __add_r_ref<_Tp&>
- { typedef _Tp& type; };
+ using __empty_not_final
+ = typename conditional<__is_final(_Tp), false_type,
+ __is_empty_non_tuple<_Tp>>::type;
- template<std::size_t _Idx, typename _Head, bool _IsEmpty>
+ template<size_t _Idx, typename _Head,
+ bool = __empty_not_final<_Head>::value>
struct _Head_base;
- template<std::size_t _Idx, typename _Head>
+#if __has_cpp_attribute(no_unique_address)
+ template<size_t _Idx, typename _Head>
+ struct _Head_base<_Idx, _Head, true>
+ {
+ constexpr _Head_base()
+ : _M_head_impl() { }
+
+ constexpr _Head_base(const _Head& __h)
+ : _M_head_impl(__h) { }
+
+ constexpr _Head_base(const _Head_base&) = default;
+ constexpr _Head_base(_Head_base&&) = default;
+
+ template<typename _UHead>
+ constexpr _Head_base(_UHead&& __h)
+ : _M_head_impl(std::forward<_UHead>(__h)) { }
+
+ _GLIBCXX20_CONSTEXPR
+ _Head_base(allocator_arg_t, __uses_alloc0)
+ : _M_head_impl() { }
+
+ template<typename _Alloc>
+ _Head_base(allocator_arg_t, __uses_alloc1<_Alloc> __a)
+ : _M_head_impl(allocator_arg, *__a._M_a) { }
+
+ template<typename _Alloc>
+ _Head_base(allocator_arg_t, __uses_alloc2<_Alloc> __a)
+ : _M_head_impl(*__a._M_a) { }
+
+ template<typename _UHead>
+ _GLIBCXX20_CONSTEXPR
+ _Head_base(__uses_alloc0, _UHead&& __uhead)
+ : _M_head_impl(std::forward<_UHead>(__uhead)) { }
+
+ template<typename _Alloc, typename _UHead>
+ _Head_base(__uses_alloc1<_Alloc> __a, _UHead&& __uhead)
+ : _M_head_impl(allocator_arg, *__a._M_a, std::forward<_UHead>(__uhead))
+ { }
+
+ template<typename _Alloc, typename _UHead>
+ _Head_base(__uses_alloc2<_Alloc> __a, _UHead&& __uhead)
+ : _M_head_impl(std::forward<_UHead>(__uhead), *__a._M_a) { }
+
+ static constexpr _Head&
+ _M_head(_Head_base& __b) noexcept { return __b._M_head_impl; }
+
+ static constexpr const _Head&
+ _M_head(const _Head_base& __b) noexcept { return __b._M_head_impl; }
+
+ [[__no_unique_address__]] _Head _M_head_impl;
+ };
+#else
+ template<size_t _Idx, typename _Head>
struct _Head_base<_Idx, _Head, true>
: public _Head
{
constexpr _Head_base(const _Head& __h)
: _Head(__h) { }
- template<typename _UHead, typename = typename
- enable_if<!is_convertible<_UHead,
- __uses_alloc_base>::value>::type>
- _Head_base(_UHead&& __h)
+ constexpr _Head_base(const _Head_base&) = default;
+ constexpr _Head_base(_Head_base&&) = default;
+
+ template<typename _UHead>
+ constexpr _Head_base(_UHead&& __h)
: _Head(std::forward<_UHead>(__h)) { }
- _Head_base(__uses_alloc0)
+ _Head_base(allocator_arg_t, __uses_alloc0)
: _Head() { }
template<typename _Alloc>
- _Head_base(__uses_alloc1<_Alloc> __a)
+ _Head_base(allocator_arg_t, __uses_alloc1<_Alloc> __a)
: _Head(allocator_arg, *__a._M_a) { }
template<typename _Alloc>
- _Head_base(__uses_alloc2<_Alloc> __a)
+ _Head_base(allocator_arg_t, __uses_alloc2<_Alloc> __a)
: _Head(*__a._M_a) { }
template<typename _UHead>
_Head_base(__uses_alloc2<_Alloc> __a, _UHead&& __uhead)
: _Head(std::forward<_UHead>(__uhead), *__a._M_a) { }
- _Head& _M_head() noexcept { return *this; }
- const _Head& _M_head() const noexcept { return *this; }
+ static constexpr _Head&
+ _M_head(_Head_base& __b) noexcept { return __b; }
+
+ static constexpr const _Head&
+ _M_head(const _Head_base& __b) noexcept { return __b; }
};
+#endif
- template<std::size_t _Idx, typename _Head>
+ template<size_t _Idx, typename _Head>
struct _Head_base<_Idx, _Head, false>
{
constexpr _Head_base()
constexpr _Head_base(const _Head& __h)
: _M_head_impl(__h) { }
- template<typename _UHead, typename = typename
- enable_if<!is_convertible<_UHead,
- __uses_alloc_base>::value>::type>
- _Head_base(_UHead&& __h)
+ constexpr _Head_base(const _Head_base&) = default;
+ constexpr _Head_base(_Head_base&&) = default;
+
+ template<typename _UHead>
+ constexpr _Head_base(_UHead&& __h)
: _M_head_impl(std::forward<_UHead>(__h)) { }
- _Head_base(__uses_alloc0)
+ _GLIBCXX20_CONSTEXPR
+ _Head_base(allocator_arg_t, __uses_alloc0)
: _M_head_impl() { }
template<typename _Alloc>
- _Head_base(__uses_alloc1<_Alloc> __a)
+ _Head_base(allocator_arg_t, __uses_alloc1<_Alloc> __a)
: _M_head_impl(allocator_arg, *__a._M_a) { }
template<typename _Alloc>
- _Head_base(__uses_alloc2<_Alloc> __a)
+ _Head_base(allocator_arg_t, __uses_alloc2<_Alloc> __a)
: _M_head_impl(*__a._M_a) { }
template<typename _UHead>
+ _GLIBCXX20_CONSTEXPR
_Head_base(__uses_alloc0, _UHead&& __uhead)
: _M_head_impl(std::forward<_UHead>(__uhead)) { }
_Head_base(__uses_alloc2<_Alloc> __a, _UHead&& __uhead)
: _M_head_impl(std::forward<_UHead>(__uhead), *__a._M_a) { }
- _Head& _M_head() noexcept { return _M_head_impl; }
- const _Head& _M_head() const noexcept { return _M_head_impl; }
+ static constexpr _Head&
+ _M_head(_Head_base& __b) noexcept { return __b._M_head_impl; }
+
+ static constexpr const _Head&
+ _M_head(const _Head_base& __b) noexcept { return __b._M_head_impl; }
- _Head _M_head_impl;
+ _Head _M_head_impl;
};
/**
* point in the hierarchy; we use it to implement a constant-time
* get() operation.
*/
- template<std::size_t _Idx, typename... _Elements>
- struct _Tuple_impl;
-
- /**
- * Zero-element tuple implementation. This is the basis case for the
- * inheritance recursion.
- */
- template<std::size_t _Idx>
- struct _Tuple_impl<_Idx>
- {
- template<std::size_t, typename...> friend class _Tuple_impl;
-
- _Tuple_impl() = default;
-
- template<typename _Alloc>
- _Tuple_impl(allocator_arg_t, const _Alloc&) { }
-
- template<typename _Alloc>
- _Tuple_impl(allocator_arg_t, const _Alloc&, const _Tuple_impl&) { }
-
- template<typename _Alloc>
- _Tuple_impl(allocator_arg_t, const _Alloc&, _Tuple_impl&&) { }
-
- protected:
- void _M_swap(_Tuple_impl&) noexcept { /* no-op */ }
- };
+ template<size_t _Idx, typename... _Elements>
+ struct _Tuple_impl;
/**
* Recursive tuple implementation. Here we store the @c Head element
* and derive from a @c Tuple_impl containing the remaining elements
* (which contains the @c Tail).
*/
- template<std::size_t _Idx, typename _Head, typename... _Tail>
+ template<size_t _Idx, typename _Head, typename... _Tail>
struct _Tuple_impl<_Idx, _Head, _Tail...>
: public _Tuple_impl<_Idx + 1, _Tail...>,
- private _Head_base<_Idx, _Head, std::is_empty<_Head>::value>
+ private _Head_base<_Idx, _Head>
{
- template<std::size_t, typename...> friend class _Tuple_impl;
+ template<size_t, typename...> friend struct _Tuple_impl;
typedef _Tuple_impl<_Idx + 1, _Tail...> _Inherited;
- typedef _Head_base<_Idx, _Head, std::is_empty<_Head>::value> _Base;
+ typedef _Head_base<_Idx, _Head> _Base;
+
+ static constexpr _Head&
+ _M_head(_Tuple_impl& __t) noexcept { return _Base::_M_head(__t); }
- _Head& _M_head() noexcept { return _Base::_M_head(); }
- const _Head& _M_head() const noexcept { return _Base::_M_head(); }
+ static constexpr const _Head&
+ _M_head(const _Tuple_impl& __t) noexcept { return _Base::_M_head(__t); }
- _Inherited& _M_tail() noexcept { return *this; }
- const _Inherited& _M_tail() const noexcept { return *this; }
+ static constexpr _Inherited&
+ _M_tail(_Tuple_impl& __t) noexcept { return __t; }
+
+ static constexpr const _Inherited&
+ _M_tail(const _Tuple_impl& __t) noexcept { return __t; }
constexpr _Tuple_impl()
: _Inherited(), _Base() { }
- explicit
- constexpr _Tuple_impl(const _Head& __head, const _Tail&... __tail)
- : _Inherited(__tail...), _Base(__head) { }
+ explicit constexpr
+ _Tuple_impl(const _Head& __head, const _Tail&... __tail)
+ : _Inherited(__tail...), _Base(__head)
+ { }
- template<typename _UHead, typename... _UTail, typename = typename
- std::enable_if<sizeof...(_Tail)==sizeof...(_UTail)>::type>
- explicit
- _Tuple_impl(_UHead&& __head, _UTail&&... __tail)
+ template<typename _UHead, typename... _UTail,
+ typename = __enable_if_t<sizeof...(_Tail) == sizeof...(_UTail)>>
+ explicit constexpr
+ _Tuple_impl(_UHead&& __head, _UTail&&... __tail)
: _Inherited(std::forward<_UTail>(__tail)...),
- _Base(std::forward<_UHead>(__head)) { }
+ _Base(std::forward<_UHead>(__head))
+ { }
constexpr _Tuple_impl(const _Tuple_impl&) = default;
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 2729. Missing SFINAE on std::pair::operator=
+ _Tuple_impl& operator=(const _Tuple_impl&) = delete;
+
+ constexpr
_Tuple_impl(_Tuple_impl&& __in)
- noexcept(std::is_nothrow_move_constructible<_Head>::value
- && std::is_nothrow_move_constructible<_Inherited>::value)
- : _Inherited(std::move(__in._M_tail())),
- _Base(std::forward<_Head>(__in._M_head())) { }
+ noexcept(__and_<is_nothrow_move_constructible<_Head>,
+ is_nothrow_move_constructible<_Inherited>>::value)
+ : _Inherited(std::move(_M_tail(__in))),
+ _Base(std::forward<_Head>(_M_head(__in)))
+ { }
template<typename... _UElements>
- _Tuple_impl(const _Tuple_impl<_Idx, _UElements...>& __in)
- : _Inherited(__in._M_tail()), _Base(__in._M_head()) { }
+ constexpr
+ _Tuple_impl(const _Tuple_impl<_Idx, _UElements...>& __in)
+ : _Inherited(_Tuple_impl<_Idx, _UElements...>::_M_tail(__in)),
+ _Base(_Tuple_impl<_Idx, _UElements...>::_M_head(__in))
+ { }
template<typename _UHead, typename... _UTails>
- _Tuple_impl(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
- : _Inherited(std::move(__in._M_tail())),
- _Base(std::forward<_UHead>(__in._M_head())) { }
+ constexpr
+ _Tuple_impl(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
+ : _Inherited(std::move
+ (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))),
+ _Base(std::forward<_UHead>
+ (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in)))
+ { }
template<typename _Alloc>
+ _GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a)
: _Inherited(__tag, __a),
- _Base(__use_alloc<_Head>(__a)) { }
+ _Base(__tag, __use_alloc<_Head>(__a))
+ { }
template<typename _Alloc>
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
- const _Head& __head, const _Tail&... __tail)
+ const _Head& __head, const _Tail&... __tail)
: _Inherited(__tag, __a, __tail...),
- _Base(__use_alloc<_Head, _Alloc, _Head>(__a), __head) { }
+ _Base(__use_alloc<_Head, _Alloc, _Head>(__a), __head)
+ { }
template<typename _Alloc, typename _UHead, typename... _UTail,
- typename = typename std::enable_if<sizeof...(_Tail)
- ==sizeof...(_UTail)>::type>
+ typename = __enable_if_t<sizeof...(_Tail) == sizeof...(_UTail)>>
+ _GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
- _UHead&& __head, _UTail&&... __tail)
+ _UHead&& __head, _UTail&&... __tail)
: _Inherited(__tag, __a, std::forward<_UTail>(__tail)...),
- _Base(__use_alloc<_Head, _Alloc, _UHead>(__a),
- std::forward<_UHead>(__head)) { }
+ _Base(__use_alloc<_Head, _Alloc, _UHead>(__a),
+ std::forward<_UHead>(__head))
+ { }
template<typename _Alloc>
- _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
- const _Tuple_impl& __in)
- : _Inherited(__tag, __a, __in._M_tail()),
- _Base(__use_alloc<_Head, _Alloc, _Head>(__a), __in._M_head()) { }
+ _GLIBCXX20_CONSTEXPR
+ _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
+ const _Tuple_impl& __in)
+ : _Inherited(__tag, __a, _M_tail(__in)),
+ _Base(__use_alloc<_Head, _Alloc, _Head>(__a), _M_head(__in))
+ { }
template<typename _Alloc>
+ _GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
- _Tuple_impl&& __in)
- noexcept(std::is_nothrow_move_constructible<_Head>::value
- && std::is_nothrow_move_constructible<_Inherited>::value)
- : _Inherited(__tag, __a, std::move(__in._M_tail())),
+ _Tuple_impl&& __in)
+ : _Inherited(__tag, __a, std::move(_M_tail(__in))),
_Base(__use_alloc<_Head, _Alloc, _Head>(__a),
- std::forward<_Head>(__in._M_head())) { }
+ std::forward<_Head>(_M_head(__in)))
+ { }
- template<typename _Alloc, typename... _UElements>
+ template<typename _Alloc, typename _UHead, typename... _UTails>
+ _GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
- const _Tuple_impl<_Idx, _UElements...>& __in)
- : _Inherited(__tag, __a, __in._M_tail()),
- _Base(__use_alloc<_Head, _Alloc, _Head>(__a), __in._M_head()) { }
+ const _Tuple_impl<_Idx, _UHead, _UTails...>& __in)
+ : _Inherited(__tag, __a,
+ _Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in)),
+ _Base(__use_alloc<_Head, _Alloc, const _UHead&>(__a),
+ _Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in))
+ { }
template<typename _Alloc, typename _UHead, typename... _UTails>
+ _GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
- _Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
- : _Inherited(__tag, __a, std::move(__in._M_tail())),
+ _Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
+ : _Inherited(__tag, __a, std::move
+ (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in))),
_Base(__use_alloc<_Head, _Alloc, _UHead>(__a),
- std::forward<_UHead>(__in._M_head())) { }
+ std::forward<_UHead>
+ (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in)))
+ { }
- _Tuple_impl&
- operator=(const _Tuple_impl& __in)
- {
- _M_head() = __in._M_head();
- _M_tail() = __in._M_tail();
- return *this;
- }
+ template<typename... _UElements>
+ _GLIBCXX20_CONSTEXPR
+ void
+ _M_assign(const _Tuple_impl<_Idx, _UElements...>& __in)
+ {
+ _M_head(*this) = _Tuple_impl<_Idx, _UElements...>::_M_head(__in);
+ _M_tail(*this)._M_assign(
+ _Tuple_impl<_Idx, _UElements...>::_M_tail(__in));
+ }
+
+ template<typename _UHead, typename... _UTails>
+ _GLIBCXX20_CONSTEXPR
+ void
+ _M_assign(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
+ {
+ _M_head(*this) = std::forward<_UHead>
+ (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in));
+ _M_tail(*this)._M_assign(
+ std::move(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in)));
+ }
- _Tuple_impl&
- operator=(_Tuple_impl&& __in)
- noexcept(std::is_nothrow_move_assignable<_Head>::value
- && std::is_nothrow_move_assignable<_Inherited>::value)
+ protected:
+ _GLIBCXX20_CONSTEXPR
+ void
+ _M_swap(_Tuple_impl& __in)
{
- _M_head() = std::forward<_Head>(__in._M_head());
- _M_tail() = std::move(__in._M_tail());
- return *this;
+ using std::swap;
+ swap(_M_head(*this), _M_head(__in));
+ _Inherited::_M_swap(_M_tail(__in));
}
+ };
- template<typename... _UElements>
- _Tuple_impl&
- operator=(const _Tuple_impl<_Idx, _UElements...>& __in)
- {
- _M_head() = __in._M_head();
- _M_tail() = __in._M_tail();
- return *this;
+ // Basis case of inheritance recursion.
+ template<size_t _Idx, typename _Head>
+ struct _Tuple_impl<_Idx, _Head>
+ : private _Head_base<_Idx, _Head>
+ {
+ template<size_t, typename...> friend struct _Tuple_impl;
+
+ typedef _Head_base<_Idx, _Head> _Base;
+
+ static constexpr _Head&
+ _M_head(_Tuple_impl& __t) noexcept { return _Base::_M_head(__t); }
+
+ static constexpr const _Head&
+ _M_head(const _Tuple_impl& __t) noexcept { return _Base::_M_head(__t); }
+
+ constexpr
+ _Tuple_impl()
+ : _Base() { }
+
+ explicit constexpr
+ _Tuple_impl(const _Head& __head)
+ : _Base(__head)
+ { }
+
+ template<typename _UHead>
+ explicit constexpr
+ _Tuple_impl(_UHead&& __head)
+ : _Base(std::forward<_UHead>(__head))
+ { }
+
+ constexpr _Tuple_impl(const _Tuple_impl&) = default;
+
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 2729. Missing SFINAE on std::pair::operator=
+ _Tuple_impl& operator=(const _Tuple_impl&) = delete;
+
+ constexpr
+ _Tuple_impl(_Tuple_impl&& __in)
+ noexcept(is_nothrow_move_constructible<_Head>::value)
+ : _Base(std::forward<_Head>(_M_head(__in)))
+ { }
+
+ template<typename _UHead>
+ constexpr
+ _Tuple_impl(const _Tuple_impl<_Idx, _UHead>& __in)
+ : _Base(_Tuple_impl<_Idx, _UHead>::_M_head(__in))
+ { }
+
+ template<typename _UHead>
+ constexpr
+ _Tuple_impl(_Tuple_impl<_Idx, _UHead>&& __in)
+ : _Base(std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in)))
+ { }
+
+ template<typename _Alloc>
+ _GLIBCXX20_CONSTEXPR
+ _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a)
+ : _Base(__tag, __use_alloc<_Head>(__a))
+ { }
+
+ template<typename _Alloc>
+ _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
+ const _Head& __head)
+ : _Base(__use_alloc<_Head, _Alloc, const _Head&>(__a), __head)
+ { }
+
+ template<typename _Alloc, typename _UHead>
+ _GLIBCXX20_CONSTEXPR
+ _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
+ _UHead&& __head)
+ : _Base(__use_alloc<_Head, _Alloc, _UHead>(__a),
+ std::forward<_UHead>(__head))
+ { }
+
+ template<typename _Alloc>
+ _GLIBCXX20_CONSTEXPR
+ _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
+ const _Tuple_impl& __in)
+ : _Base(__use_alloc<_Head, _Alloc, const _Head&>(__a), _M_head(__in))
+ { }
+
+ template<typename _Alloc>
+ _GLIBCXX20_CONSTEXPR
+ _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
+ _Tuple_impl&& __in)
+ : _Base(__use_alloc<_Head, _Alloc, _Head>(__a),
+ std::forward<_Head>(_M_head(__in)))
+ { }
+
+ template<typename _Alloc, typename _UHead>
+ _GLIBCXX20_CONSTEXPR
+ _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
+ const _Tuple_impl<_Idx, _UHead>& __in)
+ : _Base(__use_alloc<_Head, _Alloc, const _UHead&>(__a),
+ _Tuple_impl<_Idx, _UHead>::_M_head(__in))
+ { }
+
+ template<typename _Alloc, typename _UHead>
+ _GLIBCXX20_CONSTEXPR
+ _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
+ _Tuple_impl<_Idx, _UHead>&& __in)
+ : _Base(__use_alloc<_Head, _Alloc, _UHead>(__a),
+ std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in)))
+ { }
+
+ template<typename _UHead>
+ _GLIBCXX20_CONSTEXPR
+ void
+ _M_assign(const _Tuple_impl<_Idx, _UHead>& __in)
+ {
+ _M_head(*this) = _Tuple_impl<_Idx, _UHead>::_M_head(__in);
}
- template<typename _UHead, typename... _UTails>
- _Tuple_impl&
- operator=(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
- {
- _M_head() = std::forward<_UHead>(__in._M_head());
- _M_tail() = std::move(__in._M_tail());
- return *this;
+ template<typename _UHead>
+ _GLIBCXX20_CONSTEXPR
+ void
+ _M_assign(_Tuple_impl<_Idx, _UHead>&& __in)
+ {
+ _M_head(*this)
+ = std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in));
}
protected:
+ _GLIBCXX20_CONSTEXPR
void
_M_swap(_Tuple_impl& __in)
- noexcept(noexcept(swap(std::declval<_Head&>(),
- std::declval<_Head&>()))
- && noexcept(__in._M_tail()._M_swap(__in._M_tail())))
{
using std::swap;
- swap(this->_M_head(), __in._M_head());
- _Inherited::_M_swap(__in._M_tail());
+ swap(_M_head(*this), _M_head(__in));
}
};
- /// tuple
- template<typename... _Elements>
+ // Concept utility functions, reused in conditionally-explicit
+ // constructors.
+ template<bool, typename... _Types>
+ struct _TupleConstraints
+ {
+ template<typename _Tp, typename _Up> // Workaround for PR 96592
+ using is_constructible
+ = __bool_constant<__is_constructible(_Tp, _Up)>;
+
+ // Constraint for a non-explicit constructor.
+ // True iff each Ti in _Types... can be constructed from Ui in _UTypes...
+ // and every Ui is implicitly convertible to Ti.
+ template<typename... _UTypes>
+ static constexpr bool __is_implicitly_constructible()
+ {
+ return __and_<is_constructible<_Types, _UTypes>...,
+ is_convertible<_UTypes, _Types>...
+ >::value;
+ }
+
+ // Constraint for a non-explicit constructor.
+ // True iff each Ti in _Types... can be constructed from Ui in _UTypes...
+ // but not every Ui is implicitly convertible to Ti.
+ template<typename... _UTypes>
+ static constexpr bool __is_explicitly_constructible()
+ {
+ return __and_<is_constructible<_Types, _UTypes>...,
+ __not_<__and_<is_convertible<_UTypes, _Types>...>>
+ >::value;
+ }
+
+ static constexpr bool __is_implicitly_default_constructible()
+ {
+ return __and_<std::__is_implicitly_default_constructible<_Types>...
+ >::value;
+ }
+
+ static constexpr bool __is_explicitly_default_constructible()
+ {
+ return __and_<is_default_constructible<_Types>...,
+ __not_<__and_<
+ std::__is_implicitly_default_constructible<_Types>...>
+ >>::value;
+ }
+ };
+
+ // Partial specialization used when a required precondition isn't met,
+ // e.g. when sizeof...(_Types) != sizeof...(_UTypes).
+ template<typename... _Types>
+ struct _TupleConstraints<false, _Types...>
+ {
+ template<typename... _UTypes>
+ static constexpr bool __is_implicitly_constructible()
+ { return false; }
+
+ template<typename... _UTypes>
+ static constexpr bool __is_explicitly_constructible()
+ { return false; }
+ };
+
+ /// Primary class template, tuple
+ template<typename... _Elements>
class tuple : public _Tuple_impl<0, _Elements...>
{
typedef _Tuple_impl<0, _Elements...> _Inherited;
+ template<bool _Cond>
+ using _TCC = _TupleConstraints<_Cond, _Elements...>;
+
+ // Constraint for non-explicit default constructor
+ template<bool _Dummy>
+ using _ImplicitDefaultCtor = __enable_if_t<
+ _TCC<_Dummy>::__is_implicitly_default_constructible(),
+ bool>;
+
+ // Constraint for explicit default constructor
+ template<bool _Dummy>
+ using _ExplicitDefaultCtor = __enable_if_t<
+ _TCC<_Dummy>::__is_explicitly_default_constructible(),
+ bool>;
+
+ // Constraint for non-explicit constructors
+ template<bool _Cond, typename... _Args>
+ using _ImplicitCtor = __enable_if_t<
+ _TCC<_Cond>::template __is_implicitly_constructible<_Args...>(),
+ bool>;
+
+ // Constraint for non-explicit constructors
+ template<bool _Cond, typename... _Args>
+ using _ExplicitCtor = __enable_if_t<
+ _TCC<_Cond>::template __is_explicitly_constructible<_Args...>(),
+ bool>;
+
+ template<typename... _UElements>
+ static constexpr
+ __enable_if_t<sizeof...(_UElements) == sizeof...(_Elements), bool>
+ __assignable()
+ { return __and_<is_assignable<_Elements&, _UElements>...>::value; }
+
+ // Condition for noexcept-specifier of an assignment operator.
+ template<typename... _UElements>
+ static constexpr bool __nothrow_assignable()
+ {
+ return
+ __and_<is_nothrow_assignable<_Elements&, _UElements>...>::value;
+ }
+
+ // Condition for noexcept-specifier of a constructor.
+ template<typename... _UElements>
+ static constexpr bool __nothrow_constructible()
+ {
+ return
+ __and_<is_nothrow_constructible<_Elements, _UElements>...>::value;
+ }
+
+ // Constraint for tuple(_UTypes&&...) where sizeof...(_UTypes) == 1.
+ template<typename _Up>
+ static constexpr bool __valid_args()
+ {
+ return sizeof...(_Elements) == 1
+ && !is_same<tuple, __remove_cvref_t<_Up>>::value;
+ }
+
+ // Constraint for tuple(_UTypes&&...) where sizeof...(_UTypes) > 1.
+ template<typename, typename, typename... _Tail>
+ static constexpr bool __valid_args()
+ { return (sizeof...(_Tail) + 2) == sizeof...(_Elements); }
+
+ /* Constraint for constructors with a tuple<UTypes...> parameter ensures
+ * that the constructor is only viable when it would not interfere with
+ * tuple(UTypes&&...) or tuple(const tuple&) or tuple(tuple&&).
+ * Such constructors are only viable if:
+ * either sizeof...(Types) != 1,
+ * or (when Types... expands to T and UTypes... expands to U)
+ * is_convertible_v<TUPLE, T>, is_constructible_v<T, TUPLE>,
+ * and is_same_v<T, U> are all false.
+ */
+ template<typename _Tuple, typename = tuple,
+ typename = __remove_cvref_t<_Tuple>>
+ struct _UseOtherCtor
+ : false_type
+ { };
+ // If TUPLE is convertible to the single element in *this,
+ // then TUPLE should match tuple(UTypes&&...) instead.
+ template<typename _Tuple, typename _Tp, typename _Up>
+ struct _UseOtherCtor<_Tuple, tuple<_Tp>, tuple<_Up>>
+ : __or_<is_convertible<_Tuple, _Tp>, is_constructible<_Tp, _Tuple>>
+ { };
+ // If TUPLE and *this each have a single element of the same type,
+ // then TUPLE should match a copy/move constructor instead.
+ template<typename _Tuple, typename _Tp>
+ struct _UseOtherCtor<_Tuple, tuple<_Tp>, tuple<_Tp>>
+ : true_type
+ { };
+
+ // Return true iff sizeof...(Types) == 1 && tuple_size_v<TUPLE> == 1
+ // and the single element in Types can be initialized from TUPLE,
+ // or is the same type as tuple_element_t<0, TUPLE>.
+ template<typename _Tuple>
+ static constexpr bool __use_other_ctor()
+ { return _UseOtherCtor<_Tuple>::value; }
+
public:
- constexpr tuple()
- : _Inherited() { }
-
- explicit
- constexpr tuple(const _Elements&... __elements)
- : _Inherited(__elements...) { }
-
- template<typename... _UElements, typename = typename
- std::enable_if<sizeof...(_UElements)
- == sizeof...(_Elements)>::type>
- explicit
- tuple(_UElements&&... __elements)
+ template<typename _Dummy = void,
+ _ImplicitDefaultCtor<is_void<_Dummy>::value> = true>
+ constexpr
+ tuple()
+ noexcept(__and_<is_nothrow_default_constructible<_Elements>...>::value)
+ : _Inherited() { }
+
+ template<typename _Dummy = void,
+ _ExplicitDefaultCtor<is_void<_Dummy>::value> = false>
+ explicit constexpr
+ tuple()
+ noexcept(__and_<is_nothrow_default_constructible<_Elements>...>::value)
+ : _Inherited() { }
+
+ template<bool _NotEmpty = (sizeof...(_Elements) >= 1),
+ _ImplicitCtor<_NotEmpty, const _Elements&...> = true>
+ constexpr
+ tuple(const _Elements&... __elements)
+ noexcept(__nothrow_constructible<const _Elements&...>())
+ : _Inherited(__elements...) { }
+
+ template<bool _NotEmpty = (sizeof...(_Elements) >= 1),
+ _ExplicitCtor<_NotEmpty, const _Elements&...> = false>
+ explicit constexpr
+ tuple(const _Elements&... __elements)
+ noexcept(__nothrow_constructible<const _Elements&...>())
+ : _Inherited(__elements...) { }
+
+ template<typename... _UElements,
+ bool _Valid = __valid_args<_UElements...>(),
+ _ImplicitCtor<_Valid, _UElements...> = true>
+ constexpr
+ tuple(_UElements&&... __elements)
+ noexcept(__nothrow_constructible<_UElements...>())
+ : _Inherited(std::forward<_UElements>(__elements)...) { }
+
+ template<typename... _UElements,
+ bool _Valid = __valid_args<_UElements...>(),
+ _ExplicitCtor<_Valid, _UElements...> = false>
+ explicit constexpr
+ tuple(_UElements&&... __elements)
+ noexcept(__nothrow_constructible<_UElements...>())
: _Inherited(std::forward<_UElements>(__elements)...) { }
constexpr tuple(const tuple&) = default;
- tuple(tuple&&) = default;
- template<typename... _UElements, typename = typename
- std::enable_if<sizeof...(_UElements)
- == sizeof...(_Elements)>::type>
- tuple(const tuple<_UElements...>& __in)
- : _Inherited(static_cast<const _Tuple_impl<0, _UElements...>&>(__in))
- { }
+ constexpr tuple(tuple&&) = default;
- template<typename... _UElements, typename = typename
- std::enable_if<sizeof...(_UElements)
- == sizeof...(_Elements)>::type>
- tuple(tuple<_UElements...>&& __in)
- : _Inherited(static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) { }
+ template<typename... _UElements,
+ bool _Valid = (sizeof...(_Elements) == sizeof...(_UElements))
+ && !__use_other_ctor<const tuple<_UElements...>&>(),
+ _ImplicitCtor<_Valid, const _UElements&...> = true>
+ constexpr
+ tuple(const tuple<_UElements...>& __in)
+ noexcept(__nothrow_constructible<const _UElements&...>())
+ : _Inherited(static_cast<const _Tuple_impl<0, _UElements...>&>(__in))
+ { }
- // allocator-extended constructors
+ template<typename... _UElements,
+ bool _Valid = (sizeof...(_Elements) == sizeof...(_UElements))
+ && !__use_other_ctor<const tuple<_UElements...>&>(),
+ _ExplicitCtor<_Valid, const _UElements&...> = false>
+ explicit constexpr
+ tuple(const tuple<_UElements...>& __in)
+ noexcept(__nothrow_constructible<const _UElements&...>())
+ : _Inherited(static_cast<const _Tuple_impl<0, _UElements...>&>(__in))
+ { }
- template<typename _Alloc>
+ template<typename... _UElements,
+ bool _Valid = (sizeof...(_Elements) == sizeof...(_UElements))
+ && !__use_other_ctor<tuple<_UElements...>&&>(),
+ _ImplicitCtor<_Valid, _UElements...> = true>
+ constexpr
+ tuple(tuple<_UElements...>&& __in)
+ noexcept(__nothrow_constructible<_UElements...>())
+ : _Inherited(static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) { }
+
+ template<typename... _UElements,
+ bool _Valid = (sizeof...(_Elements) == sizeof...(_UElements))
+ && !__use_other_ctor<tuple<_UElements...>&&>(),
+ _ExplicitCtor<_Valid, _UElements...> = false>
+ explicit constexpr
+ tuple(tuple<_UElements...>&& __in)
+ noexcept(__nothrow_constructible<_UElements...>())
+ : _Inherited(static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) { }
+
+ // Allocator-extended constructors.
+
+ template<typename _Alloc,
+ _ImplicitDefaultCtor<is_object<_Alloc>::value> = true>
+ _GLIBCXX20_CONSTEXPR
tuple(allocator_arg_t __tag, const _Alloc& __a)
: _Inherited(__tag, __a) { }
- template<typename _Alloc>
+ template<typename _Alloc, bool _NotEmpty = (sizeof...(_Elements) >= 1),
+ _ImplicitCtor<_NotEmpty, const _Elements&...> = true>
+ _GLIBCXX20_CONSTEXPR
+ tuple(allocator_arg_t __tag, const _Alloc& __a,
+ const _Elements&... __elements)
+ : _Inherited(__tag, __a, __elements...) { }
+
+ template<typename _Alloc, bool _NotEmpty = (sizeof...(_Elements) >= 1),
+ _ExplicitCtor<_NotEmpty, const _Elements&...> = false>
+ _GLIBCXX20_CONSTEXPR
+ explicit
tuple(allocator_arg_t __tag, const _Alloc& __a,
const _Elements&... __elements)
: _Inherited(__tag, __a, __elements...) { }
- template<typename _Alloc, typename... _UElements, typename = typename
- std::enable_if<sizeof...(_UElements)
- == sizeof...(_Elements)>::type>
+ template<typename _Alloc, typename... _UElements,
+ bool _Valid = __valid_args<_UElements...>(),
+ _ImplicitCtor<_Valid, _UElements...> = true>
+ _GLIBCXX20_CONSTEXPR
+ tuple(allocator_arg_t __tag, const _Alloc& __a,
+ _UElements&&... __elements)
+ : _Inherited(__tag, __a, std::forward<_UElements>(__elements)...)
+ { }
+
+ template<typename _Alloc, typename... _UElements,
+ bool _Valid = __valid_args<_UElements...>(),
+ _ExplicitCtor<_Valid, _UElements...> = false>
+ _GLIBCXX20_CONSTEXPR
+ explicit
tuple(allocator_arg_t __tag, const _Alloc& __a,
_UElements&&... __elements)
: _Inherited(__tag, __a, std::forward<_UElements>(__elements)...)
- { }
+ { }
template<typename _Alloc>
+ _GLIBCXX20_CONSTEXPR
tuple(allocator_arg_t __tag, const _Alloc& __a, const tuple& __in)
: _Inherited(__tag, __a, static_cast<const _Inherited&>(__in)) { }
template<typename _Alloc>
+ _GLIBCXX20_CONSTEXPR
tuple(allocator_arg_t __tag, const _Alloc& __a, tuple&& __in)
: _Inherited(__tag, __a, static_cast<_Inherited&&>(__in)) { }
- template<typename _Alloc, typename... _UElements, typename = typename
- std::enable_if<sizeof...(_UElements)
- == sizeof...(_Elements)>::type>
+ template<typename _Alloc, typename... _UElements,
+ bool _Valid = (sizeof...(_Elements) == sizeof...(_UElements))
+ && !__use_other_ctor<const tuple<_UElements...>&>(),
+ _ImplicitCtor<_Valid, const _UElements&...> = true>
+ _GLIBCXX20_CONSTEXPR
+ tuple(allocator_arg_t __tag, const _Alloc& __a,
+ const tuple<_UElements...>& __in)
+ : _Inherited(__tag, __a,
+ static_cast<const _Tuple_impl<0, _UElements...>&>(__in))
+ { }
+
+ template<typename _Alloc, typename... _UElements,
+ bool _Valid = (sizeof...(_Elements) == sizeof...(_UElements))
+ && !__use_other_ctor<const tuple<_UElements...>&>(),
+ _ExplicitCtor<_Valid, const _UElements&...> = false>
+ _GLIBCXX20_CONSTEXPR
+ explicit
tuple(allocator_arg_t __tag, const _Alloc& __a,
const tuple<_UElements...>& __in)
: _Inherited(__tag, __a,
static_cast<const _Tuple_impl<0, _UElements...>&>(__in))
{ }
- template<typename _Alloc, typename... _UElements, typename = typename
- std::enable_if<sizeof...(_UElements)
- == sizeof...(_Elements)>::type>
+ template<typename _Alloc, typename... _UElements,
+ bool _Valid = (sizeof...(_Elements) == sizeof...(_UElements))
+ && !__use_other_ctor<tuple<_UElements...>&&>(),
+ _ImplicitCtor<_Valid, _UElements...> = true>
+ _GLIBCXX20_CONSTEXPR
tuple(allocator_arg_t __tag, const _Alloc& __a,
tuple<_UElements...>&& __in)
: _Inherited(__tag, __a,
static_cast<_Tuple_impl<0, _UElements...>&&>(__in))
{ }
+ template<typename _Alloc, typename... _UElements,
+ bool _Valid = (sizeof...(_Elements) == sizeof...(_UElements))
+ && !__use_other_ctor<tuple<_UElements...>&&>(),
+ _ExplicitCtor<_Valid, _UElements...> = false>
+ _GLIBCXX20_CONSTEXPR
+ explicit
+ tuple(allocator_arg_t __tag, const _Alloc& __a,
+ tuple<_UElements...>&& __in)
+ : _Inherited(__tag, __a,
+ static_cast<_Tuple_impl<0, _UElements...>&&>(__in))
+ { }
+
+ // tuple assignment
+
+ _GLIBCXX20_CONSTEXPR
tuple&
- operator=(const tuple& __in)
+ operator=(typename conditional<__assignable<const _Elements&...>(),
+ const tuple&,
+ const __nonesuch&>::type __in)
+ noexcept(__nothrow_assignable<const _Elements&...>())
{
- static_cast<_Inherited&>(*this) = __in;
+ this->_M_assign(__in);
return *this;
}
+ _GLIBCXX20_CONSTEXPR
tuple&
- operator=(tuple&& __in)
- noexcept(std::is_nothrow_move_assignable<_Inherited>::value)
+ operator=(typename conditional<__assignable<_Elements...>(),
+ tuple&&,
+ __nonesuch&&>::type __in)
+ noexcept(__nothrow_assignable<_Elements...>())
{
- static_cast<_Inherited&>(*this) = std::move(__in);
+ this->_M_assign(std::move(__in));
return *this;
}
- template<typename... _UElements, typename = typename
- std::enable_if<sizeof...(_UElements)
- == sizeof...(_Elements)>::type>
- tuple&
- operator=(const tuple<_UElements...>& __in)
- {
- static_cast<_Inherited&>(*this) = __in;
+ template<typename... _UElements>
+ _GLIBCXX20_CONSTEXPR
+ __enable_if_t<__assignable<const _UElements&...>(), tuple&>
+ operator=(const tuple<_UElements...>& __in)
+ noexcept(__nothrow_assignable<const _UElements&...>())
+ {
+ this->_M_assign(__in);
return *this;
}
- template<typename... _UElements, typename = typename
- std::enable_if<sizeof...(_UElements)
- == sizeof...(_Elements)>::type>
- tuple&
- operator=(tuple<_UElements...>&& __in)
- {
- static_cast<_Inherited&>(*this) = std::move(__in);
+ template<typename... _UElements>
+ _GLIBCXX20_CONSTEXPR
+ __enable_if_t<__assignable<_UElements...>(), tuple&>
+ operator=(tuple<_UElements...>&& __in)
+ noexcept(__nothrow_assignable<_UElements...>())
+ {
+ this->_M_assign(std::move(__in));
return *this;
}
+ // tuple swap
+ _GLIBCXX20_CONSTEXPR
void
swap(tuple& __in)
- noexcept(noexcept(__in._M_swap(__in)))
+ noexcept(__and_<__is_nothrow_swappable<_Elements>...>::value)
{ _Inherited::_M_swap(__in); }
};
- template<>
+#if __cpp_deduction_guides >= 201606
+ template<typename... _UTypes>
+ tuple(_UTypes...) -> tuple<_UTypes...>;
+ template<typename _T1, typename _T2>
+ tuple(pair<_T1, _T2>) -> tuple<_T1, _T2>;
+ template<typename _Alloc, typename... _UTypes>
+ tuple(allocator_arg_t, _Alloc, _UTypes...) -> tuple<_UTypes...>;
+ template<typename _Alloc, typename _T1, typename _T2>
+ tuple(allocator_arg_t, _Alloc, pair<_T1, _T2>) -> tuple<_T1, _T2>;
+ template<typename _Alloc, typename... _UTypes>
+ tuple(allocator_arg_t, _Alloc, tuple<_UTypes...>) -> tuple<_UTypes...>;
+#endif
+
+ // Explicit specialization, zero-element tuple.
+ template<>
class tuple<>
{
public:
void swap(tuple&) noexcept { /* no-op */ }
+ // We need the default since we're going to define no-op
+ // allocator constructors.
+ tuple() = default;
+ // No-op allocator constructors.
+ template<typename _Alloc>
+ _GLIBCXX20_CONSTEXPR
+ tuple(allocator_arg_t, const _Alloc&) noexcept { }
+ template<typename _Alloc>
+ _GLIBCXX20_CONSTEXPR
+ tuple(allocator_arg_t, const _Alloc&, const tuple&) noexcept { }
};
- /// tuple (2-element), with construction and assignment from a pair.
+ /// Partial specialization, 2-element tuple.
+ /// Includes construction and assignment from a pair.
template<typename _T1, typename _T2>
class tuple<_T1, _T2> : public _Tuple_impl<0, _T1, _T2>
{
typedef _Tuple_impl<0, _T1, _T2> _Inherited;
- public:
- constexpr tuple()
- : _Inherited() { }
+ // Constraint for non-explicit default constructor
+ template<bool _Dummy, typename _U1, typename _U2>
+ using _ImplicitDefaultCtor = __enable_if_t<
+ _TupleConstraints<_Dummy, _U1, _U2>::
+ __is_implicitly_default_constructible(),
+ bool>;
+
+ // Constraint for explicit default constructor
+ template<bool _Dummy, typename _U1, typename _U2>
+ using _ExplicitDefaultCtor = __enable_if_t<
+ _TupleConstraints<_Dummy, _U1, _U2>::
+ __is_explicitly_default_constructible(),
+ bool>;
+
+ template<bool _Dummy>
+ using _TCC = _TupleConstraints<_Dummy, _T1, _T2>;
+
+ // Constraint for non-explicit constructors
+ template<bool _Cond, typename _U1, typename _U2>
+ using _ImplicitCtor = __enable_if_t<
+ _TCC<_Cond>::template __is_implicitly_constructible<_U1, _U2>(),
+ bool>;
+
+ // Constraint for non-explicit constructors
+ template<bool _Cond, typename _U1, typename _U2>
+ using _ExplicitCtor = __enable_if_t<
+ _TCC<_Cond>::template __is_explicitly_constructible<_U1, _U2>(),
+ bool>;
- explicit
- constexpr tuple(const _T1& __a1, const _T2& __a2)
- : _Inherited(__a1, __a2) { }
+ template<typename _U1, typename _U2>
+ static constexpr bool __assignable()
+ {
+ return __and_<is_assignable<_T1&, _U1>,
+ is_assignable<_T2&, _U2>>::value;
+ }
template<typename _U1, typename _U2>
- explicit
- tuple(_U1&& __a1, _U2&& __a2)
+ static constexpr bool __nothrow_assignable()
+ {
+ return __and_<is_nothrow_assignable<_T1&, _U1>,
+ is_nothrow_assignable<_T2&, _U2>>::value;
+ }
+
+ template<typename _U1, typename _U2>
+ static constexpr bool __nothrow_constructible()
+ {
+ return __and_<is_nothrow_constructible<_T1, _U1>,
+ is_nothrow_constructible<_T2, _U2>>::value;
+ }
+
+ static constexpr bool __nothrow_default_constructible()
+ {
+ return __and_<is_nothrow_default_constructible<_T1>,
+ is_nothrow_default_constructible<_T2>>::value;
+ }
+
+ template<typename _U1>
+ static constexpr bool __is_alloc_arg()
+ { return is_same<__remove_cvref_t<_U1>, allocator_arg_t>::value; }
+
+ public:
+ template<bool _Dummy = true,
+ _ImplicitDefaultCtor<_Dummy, _T1, _T2> = true>
+ constexpr
+ tuple()
+ noexcept(__nothrow_default_constructible())
+ : _Inherited() { }
+
+ template<bool _Dummy = true,
+ _ExplicitDefaultCtor<_Dummy, _T1, _T2> = false>
+ explicit constexpr
+ tuple()
+ noexcept(__nothrow_default_constructible())
+ : _Inherited() { }
+
+ template<bool _Dummy = true,
+ _ImplicitCtor<_Dummy, const _T1&, const _T2&> = true>
+ constexpr
+ tuple(const _T1& __a1, const _T2& __a2)
+ noexcept(__nothrow_constructible<const _T1&, const _T2&>())
+ : _Inherited(__a1, __a2) { }
+
+ template<bool _Dummy = true,
+ _ExplicitCtor<_Dummy, const _T1&, const _T2&> = false>
+ explicit constexpr
+ tuple(const _T1& __a1, const _T2& __a2)
+ noexcept(__nothrow_constructible<const _T1&, const _T2&>())
+ : _Inherited(__a1, __a2) { }
+
+ template<typename _U1, typename _U2,
+ _ImplicitCtor<!__is_alloc_arg<_U1>(), _U1, _U2> = true>
+ constexpr
+ tuple(_U1&& __a1, _U2&& __a2)
+ noexcept(__nothrow_constructible<_U1, _U2>())
+ : _Inherited(std::forward<_U1>(__a1), std::forward<_U2>(__a2)) { }
+
+ template<typename _U1, typename _U2,
+ _ExplicitCtor<!__is_alloc_arg<_U1>(), _U1, _U2> = false>
+ explicit constexpr
+ tuple(_U1&& __a1, _U2&& __a2)
+ noexcept(__nothrow_constructible<_U1, _U2>())
: _Inherited(std::forward<_U1>(__a1), std::forward<_U2>(__a2)) { }
constexpr tuple(const tuple&) = default;
- tuple(tuple&&) = default;
- template<typename _U1, typename _U2>
- tuple(const tuple<_U1, _U2>& __in)
+ constexpr tuple(tuple&&) = default;
+
+ template<typename _U1, typename _U2,
+ _ImplicitCtor<true, const _U1&, const _U2&> = true>
+ constexpr
+ tuple(const tuple<_U1, _U2>& __in)
+ noexcept(__nothrow_constructible<const _U1&, const _U2&>())
: _Inherited(static_cast<const _Tuple_impl<0, _U1, _U2>&>(__in)) { }
- template<typename _U1, typename _U2>
- tuple(tuple<_U1, _U2>&& __in)
+ template<typename _U1, typename _U2,
+ _ExplicitCtor<true, const _U1&, const _U2&> = false>
+ explicit constexpr
+ tuple(const tuple<_U1, _U2>& __in)
+ noexcept(__nothrow_constructible<const _U1&, const _U2&>())
+ : _Inherited(static_cast<const _Tuple_impl<0, _U1, _U2>&>(__in)) { }
+
+ template<typename _U1, typename _U2,
+ _ImplicitCtor<true, _U1, _U2> = true>
+ constexpr
+ tuple(tuple<_U1, _U2>&& __in)
+ noexcept(__nothrow_constructible<_U1, _U2>())
: _Inherited(static_cast<_Tuple_impl<0, _U1, _U2>&&>(__in)) { }
- template<typename _U1, typename _U2>
- tuple(const pair<_U1, _U2>& __in)
+ template<typename _U1, typename _U2,
+ _ExplicitCtor<true, _U1, _U2> = false>
+ explicit constexpr
+ tuple(tuple<_U1, _U2>&& __in)
+ noexcept(__nothrow_constructible<_U1, _U2>())
+ : _Inherited(static_cast<_Tuple_impl<0, _U1, _U2>&&>(__in)) { }
+
+ template<typename _U1, typename _U2,
+ _ImplicitCtor<true, const _U1&, const _U2&> = true>
+ constexpr
+ tuple(const pair<_U1, _U2>& __in)
+ noexcept(__nothrow_constructible<const _U1&, const _U2&>())
: _Inherited(__in.first, __in.second) { }
- template<typename _U1, typename _U2>
- tuple(pair<_U1, _U2>&& __in)
+ template<typename _U1, typename _U2,
+ _ExplicitCtor<true, const _U1&, const _U2&> = false>
+ explicit constexpr
+ tuple(const pair<_U1, _U2>& __in)
+ noexcept(__nothrow_constructible<const _U1&, const _U2&>())
+ : _Inherited(__in.first, __in.second) { }
+
+ template<typename _U1, typename _U2,
+ _ImplicitCtor<true, _U1, _U2> = true>
+ constexpr
+ tuple(pair<_U1, _U2>&& __in)
+ noexcept(__nothrow_constructible<_U1, _U2>())
: _Inherited(std::forward<_U1>(__in.first),
std::forward<_U2>(__in.second)) { }
- // allocator-extended constructors
+ template<typename _U1, typename _U2,
+ _ExplicitCtor<true, _U1, _U2> = false>
+ explicit constexpr
+ tuple(pair<_U1, _U2>&& __in)
+ noexcept(__nothrow_constructible<_U1, _U2>())
+ : _Inherited(std::forward<_U1>(__in.first),
+ std::forward<_U2>(__in.second)) { }
- template<typename _Alloc>
+ // Allocator-extended constructors.
+
+ template<typename _Alloc,
+ _ImplicitDefaultCtor<is_object<_Alloc>::value, _T1, _T2> = true>
+ _GLIBCXX20_CONSTEXPR
tuple(allocator_arg_t __tag, const _Alloc& __a)
: _Inherited(__tag, __a) { }
- template<typename _Alloc>
+ template<typename _Alloc, bool _Dummy = true,
+ _ImplicitCtor<_Dummy, const _T1&, const _T2&> = true>
+ _GLIBCXX20_CONSTEXPR
+ tuple(allocator_arg_t __tag, const _Alloc& __a,
+ const _T1& __a1, const _T2& __a2)
+ : _Inherited(__tag, __a, __a1, __a2) { }
+
+ template<typename _Alloc, bool _Dummy = true,
+ _ExplicitCtor<_Dummy, const _T1&, const _T2&> = false>
+ explicit
+ _GLIBCXX20_CONSTEXPR
tuple(allocator_arg_t __tag, const _Alloc& __a,
const _T1& __a1, const _T2& __a2)
: _Inherited(__tag, __a, __a1, __a2) { }
- template<typename _Alloc, typename _U1, typename _U2>
+ template<typename _Alloc, typename _U1, typename _U2,
+ _ImplicitCtor<true, _U1, _U2> = true>
+ _GLIBCXX20_CONSTEXPR
tuple(allocator_arg_t __tag, const _Alloc& __a, _U1&& __a1, _U2&& __a2)
: _Inherited(__tag, __a, std::forward<_U1>(__a1),
std::forward<_U2>(__a2)) { }
+ template<typename _Alloc, typename _U1, typename _U2,
+ _ExplicitCtor<true, _U1, _U2> = false>
+ explicit
+ _GLIBCXX20_CONSTEXPR
+ tuple(allocator_arg_t __tag, const _Alloc& __a,
+ _U1&& __a1, _U2&& __a2)
+ : _Inherited(__tag, __a, std::forward<_U1>(__a1),
+ std::forward<_U2>(__a2)) { }
+
template<typename _Alloc>
+ _GLIBCXX20_CONSTEXPR
tuple(allocator_arg_t __tag, const _Alloc& __a, const tuple& __in)
: _Inherited(__tag, __a, static_cast<const _Inherited&>(__in)) { }
template<typename _Alloc>
+ _GLIBCXX20_CONSTEXPR
tuple(allocator_arg_t __tag, const _Alloc& __a, tuple&& __in)
: _Inherited(__tag, __a, static_cast<_Inherited&&>(__in)) { }
- template<typename _Alloc, typename _U1, typename _U2>
+ template<typename _Alloc, typename _U1, typename _U2,
+ _ImplicitCtor<true, const _U1&, const _U2&> = true>
+ _GLIBCXX20_CONSTEXPR
tuple(allocator_arg_t __tag, const _Alloc& __a,
const tuple<_U1, _U2>& __in)
: _Inherited(__tag, __a,
static_cast<const _Tuple_impl<0, _U1, _U2>&>(__in))
{ }
- template<typename _Alloc, typename _U1, typename _U2>
+ template<typename _Alloc, typename _U1, typename _U2,
+ _ExplicitCtor<true, const _U1&, const _U2&> = false>
+ explicit
+ _GLIBCXX20_CONSTEXPR
+ tuple(allocator_arg_t __tag, const _Alloc& __a,
+ const tuple<_U1, _U2>& __in)
+ : _Inherited(__tag, __a,
+ static_cast<const _Tuple_impl<0, _U1, _U2>&>(__in))
+ { }
+
+ template<typename _Alloc, typename _U1, typename _U2,
+ _ImplicitCtor<true, _U1, _U2> = true>
+ _GLIBCXX20_CONSTEXPR
+ tuple(allocator_arg_t __tag, const _Alloc& __a, tuple<_U1, _U2>&& __in)
+ : _Inherited(__tag, __a, static_cast<_Tuple_impl<0, _U1, _U2>&&>(__in))
+ { }
+
+ template<typename _Alloc, typename _U1, typename _U2,
+ _ExplicitCtor<true, _U1, _U2> = false>
+ explicit
+ _GLIBCXX20_CONSTEXPR
tuple(allocator_arg_t __tag, const _Alloc& __a, tuple<_U1, _U2>&& __in)
: _Inherited(__tag, __a, static_cast<_Tuple_impl<0, _U1, _U2>&&>(__in))
{ }
- template<typename _Alloc, typename _U1, typename _U2>
- tuple(allocator_arg_t __tag, const _Alloc& __a,
+ template<typename _Alloc, typename _U1, typename _U2,
+ _ImplicitCtor<true, const _U1&, const _U2&> = true>
+ _GLIBCXX20_CONSTEXPR
+ tuple(allocator_arg_t __tag, const _Alloc& __a,
+ const pair<_U1, _U2>& __in)
+ : _Inherited(__tag, __a, __in.first, __in.second) { }
+
+ template<typename _Alloc, typename _U1, typename _U2,
+ _ExplicitCtor<true, const _U1&, const _U2&> = false>
+ explicit
+ _GLIBCXX20_CONSTEXPR
+ tuple(allocator_arg_t __tag, const _Alloc& __a,
const pair<_U1, _U2>& __in)
: _Inherited(__tag, __a, __in.first, __in.second) { }
- template<typename _Alloc, typename _U1, typename _U2>
- tuple(allocator_arg_t __tag, const _Alloc& __a, pair<_U1, _U2>&& __in)
+ template<typename _Alloc, typename _U1, typename _U2,
+ _ImplicitCtor<true, _U1, _U2> = true>
+ _GLIBCXX20_CONSTEXPR
+ tuple(allocator_arg_t __tag, const _Alloc& __a, pair<_U1, _U2>&& __in)
: _Inherited(__tag, __a, std::forward<_U1>(__in.first),
std::forward<_U2>(__in.second)) { }
+ template<typename _Alloc, typename _U1, typename _U2,
+ _ExplicitCtor<true, _U1, _U2> = false>
+ explicit
+ _GLIBCXX20_CONSTEXPR
+ tuple(allocator_arg_t __tag, const _Alloc& __a, pair<_U1, _U2>&& __in)
+ : _Inherited(__tag, __a, std::forward<_U1>(__in.first),
+ std::forward<_U2>(__in.second)) { }
+
+ // Tuple assignment.
+
+ _GLIBCXX20_CONSTEXPR
tuple&
- operator=(const tuple& __in)
+ operator=(typename conditional<__assignable<const _T1&, const _T2&>(),
+ const tuple&,
+ const __nonesuch&>::type __in)
+ noexcept(__nothrow_assignable<const _T1&, const _T2&>())
{
- static_cast<_Inherited&>(*this) = __in;
+ this->_M_assign(__in);
return *this;
}
+ _GLIBCXX20_CONSTEXPR
tuple&
- operator=(tuple&& __in)
- noexcept(std::is_nothrow_move_assignable<_Inherited>::value)
+ operator=(typename conditional<__assignable<_T1, _T2>(),
+ tuple&&,
+ __nonesuch&&>::type __in)
+ noexcept(__nothrow_assignable<_T1, _T2>())
{
- static_cast<_Inherited&>(*this) = std::move(__in);
+ this->_M_assign(std::move(__in));
return *this;
}
template<typename _U1, typename _U2>
- tuple&
- operator=(const tuple<_U1, _U2>& __in)
- {
- static_cast<_Inherited&>(*this) = __in;
+ _GLIBCXX20_CONSTEXPR
+ __enable_if_t<__assignable<const _U1&, const _U2&>(), tuple&>
+ operator=(const tuple<_U1, _U2>& __in)
+ noexcept(__nothrow_assignable<const _U1&, const _U2&>())
+ {
+ this->_M_assign(__in);
return *this;
}
template<typename _U1, typename _U2>
- tuple&
- operator=(tuple<_U1, _U2>&& __in)
- {
- static_cast<_Inherited&>(*this) = std::move(__in);
+ _GLIBCXX20_CONSTEXPR
+ __enable_if_t<__assignable<_U1, _U2>(), tuple&>
+ operator=(tuple<_U1, _U2>&& __in)
+ noexcept(__nothrow_assignable<_U1, _U2>())
+ {
+ this->_M_assign(std::move(__in));
return *this;
}
template<typename _U1, typename _U2>
- tuple&
- operator=(const pair<_U1, _U2>& __in)
- {
- this->_M_head() = __in.first;
- this->_M_tail()._M_head() = __in.second;
+ _GLIBCXX20_CONSTEXPR
+ __enable_if_t<__assignable<const _U1&, const _U2&>(), tuple&>
+ operator=(const pair<_U1, _U2>& __in)
+ noexcept(__nothrow_assignable<const _U1&, const _U2&>())
+ {
+ this->_M_head(*this) = __in.first;
+ this->_M_tail(*this)._M_head(*this) = __in.second;
return *this;
}
template<typename _U1, typename _U2>
- tuple&
- operator=(pair<_U1, _U2>&& __in)
- {
- this->_M_head() = std::forward<_U1>(__in.first);
- this->_M_tail()._M_head() = std::forward<_U2>(__in.second);
+ _GLIBCXX20_CONSTEXPR
+ __enable_if_t<__assignable<_U1, _U2>(), tuple&>
+ operator=(pair<_U1, _U2>&& __in)
+ noexcept(__nothrow_assignable<_U1, _U2>())
+ {
+ this->_M_head(*this) = std::forward<_U1>(__in.first);
+ this->_M_tail(*this)._M_head(*this) = std::forward<_U2>(__in.second);
return *this;
}
+ _GLIBCXX20_CONSTEXPR
void
swap(tuple& __in)
- noexcept(noexcept(__in._M_swap(__in)))
+ noexcept(__and_<__is_nothrow_swappable<_T1>,
+ __is_nothrow_swappable<_T2>>::value)
{ _Inherited::_M_swap(__in); }
};
- /// tuple (1-element).
- template<typename _T1>
- class tuple<_T1> : public _Tuple_impl<0, _T1>
- {
- typedef _Tuple_impl<0, _T1> _Inherited;
-
- public:
- constexpr tuple()
- : _Inherited() { }
-
- explicit
- constexpr tuple(const _T1& __a1)
- : _Inherited(__a1) { }
-
- template<typename _U1, typename = typename
- std::enable_if<std::is_constructible<_T1, _U1&&>::value>::type>
- explicit
- tuple(_U1&& __a1)
- : _Inherited(std::forward<_U1>(__a1)) { }
-
- constexpr tuple(const tuple&) = default;
- tuple(tuple&&) = default;
-
- template<typename _U1>
- tuple(const tuple<_U1>& __in)
- : _Inherited(static_cast<const _Tuple_impl<0, _U1>&>(__in)) { }
-
- template<typename _U1>
- tuple(tuple<_U1>&& __in)
- : _Inherited(static_cast<_Tuple_impl<0, _U1>&&>(__in)) { }
-
- // allocator-extended constructors
-
- template<typename _Alloc>
- tuple(allocator_arg_t __tag, const _Alloc& __a)
- : _Inherited(__tag, __a) { }
-
- template<typename _Alloc>
- tuple(allocator_arg_t __tag, const _Alloc& __a, const _T1& __a1)
- : _Inherited(__tag, __a, __a1) { }
-
- // TODO: constrain for is_uses_allocator_constructible<_T1, _U1&&, _Alloc>
- template<typename _Alloc, typename _U1>
- tuple(allocator_arg_t __tag, const _Alloc& __a, _U1&& __a1)
- : _Inherited(__tag, __a, std::forward<_U1>(__a1)) { }
-
- template<typename _Alloc>
- tuple(allocator_arg_t __tag, const _Alloc& __a, const tuple& __in)
- : _Inherited(__tag, __a, static_cast<const _Inherited&>(__in)) { }
-
- template<typename _Alloc>
- tuple(allocator_arg_t __tag, const _Alloc& __a, tuple&& __in)
- : _Inherited(__tag, __a, static_cast<_Inherited&&>(__in)) { }
-
- template<typename _Alloc, typename _U1>
- tuple(allocator_arg_t __tag, const _Alloc& __a, const tuple<_U1>& __in)
- : _Inherited(__tag, __a, static_cast<const _Tuple_impl<0, _U1>&>(__in))
- { }
-
- template<typename _Alloc, typename _U1>
- tuple(allocator_arg_t __tag, const _Alloc& __a, tuple<_U1>&& __in)
- : _Inherited(__tag, __a, static_cast<_Tuple_impl<0, _U1>&&>(__in)) { }
-
- tuple&
- operator=(const tuple& __in)
- {
- static_cast<_Inherited&>(*this) = __in;
- return *this;
- }
-
- tuple&
- operator=(tuple&& __in)
- noexcept(std::is_nothrow_move_assignable<_Inherited>::value)
- {
- static_cast<_Inherited&>(*this) = std::move(__in);
- return *this;
- }
-
- template<typename _U1>
- tuple&
- operator=(const tuple<_U1>& __in)
- {
- static_cast<_Inherited&>(*this) = __in;
- return *this;
- }
-
- template<typename _U1>
- tuple&
- operator=(tuple<_U1>&& __in)
- {
- static_cast<_Inherited&>(*this) = std::move(__in);
- return *this;
- }
-
- void
- swap(tuple& __in)
- noexcept(noexcept(__in._M_swap(__in)))
- { _Inherited::_M_swap(__in); }
- };
+ /// class tuple_size
+ template<typename... _Elements>
+ struct tuple_size<tuple<_Elements...>>
+ : public integral_constant<size_t, sizeof...(_Elements)> { };
- /// Gives the type of the ith element of a given tuple type.
- template<std::size_t __i, typename _Tp>
- struct tuple_element;
+#if __cplusplus > 201402L
+ template <typename _Tp>
+ inline constexpr size_t tuple_size_v = tuple_size<_Tp>::value;
+#endif
/**
* Recursive case for tuple_element: strip off the first element in
* the tuple and retrieve the (i-1)th element of the remaining tuple.
*/
- template<std::size_t __i, typename _Head, typename... _Tail>
+ template<size_t __i, typename _Head, typename... _Tail>
struct tuple_element<__i, tuple<_Head, _Tail...> >
: tuple_element<__i - 1, tuple<_Tail...> > { };
typedef _Head type;
};
- template<std::size_t __i, typename _Tp>
- struct tuple_element<__i, const _Tp>
- {
- typedef typename
- add_const<typename tuple_element<__i, _Tp>::type>::type type;
- };
-
- template<std::size_t __i, typename _Tp>
- struct tuple_element<__i, volatile _Tp>
- {
- typedef typename
- add_volatile<typename tuple_element<__i, _Tp>::type>::type type;
- };
-
- template<std::size_t __i, typename _Tp>
- struct tuple_element<__i, const volatile _Tp>
+ /**
+ * Error case for tuple_element: invalid index.
+ */
+ template<size_t __i>
+ struct tuple_element<__i, tuple<>>
{
- typedef typename
- add_cv<typename tuple_element<__i, _Tp>::type>::type type;
+ static_assert(__i < tuple_size<tuple<>>::value,
+ "tuple index is in range");
};
- /// Finds the size of a given tuple type.
- template<typename _Tp>
- struct tuple_size;
-
- template<typename _Tp>
- struct tuple_size<const _Tp>
- : public integral_constant<
- typename remove_cv<decltype(tuple_size<_Tp>::value)>::type,
- tuple_size<_Tp>::value> { };
-
- template<typename _Tp>
- struct tuple_size<volatile _Tp>
- : public integral_constant<
- typename remove_cv<decltype(tuple_size<_Tp>::value)>::type,
- tuple_size<_Tp>::value> { };
-
- template<typename _Tp>
- struct tuple_size<const volatile _Tp>
- : public integral_constant<
- typename remove_cv<decltype(tuple_size<_Tp>::value)>::type,
- tuple_size<_Tp>::value> { };
-
- /// class tuple_size
- template<typename... _Elements>
- struct tuple_size<tuple<_Elements...>>
- : public integral_constant<std::size_t, sizeof...(_Elements)> { };
-
- template<std::size_t __i, typename _Head, typename... _Tail>
- inline typename __add_ref<_Head>::type
+ template<size_t __i, typename _Head, typename... _Tail>
+ constexpr _Head&
__get_helper(_Tuple_impl<__i, _Head, _Tail...>& __t) noexcept
- { return __t._M_head(); }
+ { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); }
- template<std::size_t __i, typename _Head, typename... _Tail>
- inline typename __add_c_ref<_Head>::type
+ template<size_t __i, typename _Head, typename... _Tail>
+ constexpr const _Head&
__get_helper(const _Tuple_impl<__i, _Head, _Tail...>& __t) noexcept
- { return __t._M_head(); }
-
- // Return a reference (const reference, rvalue reference) to the ith element
- // of a tuple. Any const or non-const ref elements are returned with their
- // original type.
- template<std::size_t __i, typename... _Elements>
- inline typename __add_ref<
- typename tuple_element<__i, tuple<_Elements...>>::type
- >::type
+ { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); }
+
+ /// Return a reference to the ith element of a tuple.
+ template<size_t __i, typename... _Elements>
+ constexpr __tuple_element_t<__i, tuple<_Elements...>>&
get(tuple<_Elements...>& __t) noexcept
- { return __get_helper<__i>(__t); }
+ { return std::__get_helper<__i>(__t); }
- template<std::size_t __i, typename... _Elements>
- inline typename __add_c_ref<
- typename tuple_element<__i, tuple<_Elements...>>::type
- >::type
+ /// Return a const reference to the ith element of a const tuple.
+ template<size_t __i, typename... _Elements>
+ constexpr const __tuple_element_t<__i, tuple<_Elements...>>&
get(const tuple<_Elements...>& __t) noexcept
- { return __get_helper<__i>(__t); }
+ { return std::__get_helper<__i>(__t); }
- template<std::size_t __i, typename... _Elements>
- inline typename __add_r_ref<
- typename tuple_element<__i, tuple<_Elements...>>::type
- >::type
+ /// Return an rvalue reference to the ith element of a tuple rvalue.
+ template<size_t __i, typename... _Elements>
+ constexpr __tuple_element_t<__i, tuple<_Elements...>>&&
get(tuple<_Elements...>&& __t) noexcept
- { return std::forward<typename tuple_element<__i,
- tuple<_Elements...>>::type&&>(get<__i>(__t)); }
+ {
+ typedef __tuple_element_t<__i, tuple<_Elements...>> __element_type;
+ return std::forward<__element_type&&>(std::get<__i>(__t));
+ }
- // This class helps construct the various comparison operations on tuples
- template<std::size_t __check_equal_size, std::size_t __i, std::size_t __j,
- typename _Tp, typename _Up>
- struct __tuple_compare;
+ /// Return a const rvalue reference to the ith element of a const tuple rvalue.
+ template<size_t __i, typename... _Elements>
+ constexpr const __tuple_element_t<__i, tuple<_Elements...>>&&
+ get(const tuple<_Elements...>&& __t) noexcept
+ {
+ typedef __tuple_element_t<__i, tuple<_Elements...>> __element_type;
+ return std::forward<const __element_type&&>(std::get<__i>(__t));
+ }
- template<std::size_t __i, std::size_t __j, typename _Tp, typename _Up>
- struct __tuple_compare<0, __i, __j, _Tp, _Up>
+#if __cplusplus >= 201402L
+
+#define __cpp_lib_tuples_by_type 201304
+
+ template<typename _Head, size_t __i, typename... _Tail>
+ constexpr _Head&
+ __get_helper2(_Tuple_impl<__i, _Head, _Tail...>& __t) noexcept
+ { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); }
+
+ template<typename _Head, size_t __i, typename... _Tail>
+ constexpr const _Head&
+ __get_helper2(const _Tuple_impl<__i, _Head, _Tail...>& __t) noexcept
+ { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); }
+
+ /// Return a reference to the unique element of type _Tp of a tuple.
+ template <typename _Tp, typename... _Types>
+ constexpr _Tp&
+ get(tuple<_Types...>& __t) noexcept
+ { return std::__get_helper2<_Tp>(__t); }
+
+ /// Return a reference to the unique element of type _Tp of a tuple rvalue.
+ template <typename _Tp, typename... _Types>
+ constexpr _Tp&&
+ get(tuple<_Types...>&& __t) noexcept
+ { return std::forward<_Tp&&>(std::__get_helper2<_Tp>(__t)); }
+
+ /// Return a const reference to the unique element of type _Tp of a tuple.
+ template <typename _Tp, typename... _Types>
+ constexpr const _Tp&
+ get(const tuple<_Types...>& __t) noexcept
+ { return std::__get_helper2<_Tp>(__t); }
+
+ /// Return a const reference to the unique element of type _Tp of
+ /// a const tuple rvalue.
+ template <typename _Tp, typename... _Types>
+ constexpr const _Tp&&
+ get(const tuple<_Types...>&& __t) noexcept
+ { return std::forward<const _Tp&&>(std::__get_helper2<_Tp>(__t)); }
+#endif
+
+ // This class performs the comparison operations on tuples
+ template<typename _Tp, typename _Up, size_t __i, size_t __size>
+ struct __tuple_compare
{
- static bool __eq(const _Tp& __t, const _Up& __u)
+ static constexpr bool
+ __eq(const _Tp& __t, const _Up& __u)
{
- return (get<__i>(__t) == get<__i>(__u) &&
- __tuple_compare<0, __i + 1, __j, _Tp, _Up>::__eq(__t, __u));
+ return bool(std::get<__i>(__t) == std::get<__i>(__u))
+ && __tuple_compare<_Tp, _Up, __i + 1, __size>::__eq(__t, __u);
}
-
- static bool __less(const _Tp& __t, const _Up& __u)
+
+ static constexpr bool
+ __less(const _Tp& __t, const _Up& __u)
{
- return ((get<__i>(__t) < get<__i>(__u))
- || !(get<__i>(__u) < get<__i>(__t)) &&
- __tuple_compare<0, __i + 1, __j, _Tp, _Up>::__less(__t, __u));
+ return bool(std::get<__i>(__t) < std::get<__i>(__u))
+ || (!bool(std::get<__i>(__u) < std::get<__i>(__t))
+ && __tuple_compare<_Tp, _Up, __i + 1, __size>::__less(__t, __u));
}
};
- template<std::size_t __i, typename _Tp, typename _Up>
- struct __tuple_compare<0, __i, __i, _Tp, _Up>
+ template<typename _Tp, typename _Up, size_t __size>
+ struct __tuple_compare<_Tp, _Up, __size, __size>
{
- static bool __eq(const _Tp&, const _Up&)
- { return true; }
-
- static bool __less(const _Tp&, const _Up&)
- { return false; }
+ static constexpr bool
+ __eq(const _Tp&, const _Up&) { return true; }
+
+ static constexpr bool
+ __less(const _Tp&, const _Up&) { return false; }
};
template<typename... _TElements, typename... _UElements>
- bool
+ constexpr bool
operator==(const tuple<_TElements...>& __t,
const tuple<_UElements...>& __u)
{
- typedef tuple<_TElements...> _Tp;
- typedef tuple<_UElements...> _Up;
- return (__tuple_compare<tuple_size<_Tp>::value - tuple_size<_Up>::value,
- 0, tuple_size<_Tp>::value, _Tp, _Up>::__eq(__t, __u));
+ static_assert(sizeof...(_TElements) == sizeof...(_UElements),
+ "tuple objects can only be compared if they have equal sizes.");
+ using __compare = __tuple_compare<tuple<_TElements...>,
+ tuple<_UElements...>,
+ 0, sizeof...(_TElements)>;
+ return __compare::__eq(__t, __u);
}
+#if __cpp_lib_three_way_comparison
+ template<typename _Cat, typename _Tp, typename _Up>
+ constexpr _Cat
+ __tuple_cmp(const _Tp&, const _Up&, index_sequence<>)
+ { return _Cat::equivalent; }
+
+ template<typename _Cat, typename _Tp, typename _Up,
+ size_t _Idx0, size_t... _Idxs>
+ constexpr _Cat
+ __tuple_cmp(const _Tp& __t, const _Up& __u,
+ index_sequence<_Idx0, _Idxs...>)
+ {
+ auto __c
+ = __detail::__synth3way(std::get<_Idx0>(__t), std::get<_Idx0>(__u));
+ if (__c != 0)
+ return __c;
+ return std::__tuple_cmp<_Cat>(__t, __u, index_sequence<_Idxs...>());
+ }
+
+ template<typename... _Tps, typename... _Ups>
+ constexpr
+ common_comparison_category_t<__detail::__synth3way_t<_Tps, _Ups>...>
+ operator<=>(const tuple<_Tps...>& __t, const tuple<_Ups...>& __u)
+ {
+ using _Cat
+ = common_comparison_category_t<__detail::__synth3way_t<_Tps, _Ups>...>;
+ return std::__tuple_cmp<_Cat>(__t, __u, index_sequence_for<_Tps...>());
+ }
+#else
template<typename... _TElements, typename... _UElements>
- bool
+ constexpr bool
operator<(const tuple<_TElements...>& __t,
const tuple<_UElements...>& __u)
{
- typedef tuple<_TElements...> _Tp;
- typedef tuple<_UElements...> _Up;
- return (__tuple_compare<tuple_size<_Tp>::value - tuple_size<_Up>::value,
- 0, tuple_size<_Tp>::value, _Tp, _Up>::__less(__t, __u));
+ static_assert(sizeof...(_TElements) == sizeof...(_UElements),
+ "tuple objects can only be compared if they have equal sizes.");
+ using __compare = __tuple_compare<tuple<_TElements...>,
+ tuple<_UElements...>,
+ 0, sizeof...(_TElements)>;
+ return __compare::__less(__t, __u);
}
template<typename... _TElements, typename... _UElements>
- inline bool
+ constexpr bool
operator!=(const tuple<_TElements...>& __t,
const tuple<_UElements...>& __u)
{ return !(__t == __u); }
template<typename... _TElements, typename... _UElements>
- inline bool
+ constexpr bool
operator>(const tuple<_TElements...>& __t,
const tuple<_UElements...>& __u)
{ return __u < __t; }
template<typename... _TElements, typename... _UElements>
- inline bool
+ constexpr bool
operator<=(const tuple<_TElements...>& __t,
const tuple<_UElements...>& __u)
{ return !(__u < __t); }
template<typename... _TElements, typename... _UElements>
- inline bool
+ constexpr bool
operator>=(const tuple<_TElements...>& __t,
const tuple<_UElements...>& __u)
{ return !(__t < __u); }
+#endif // three_way_comparison
// NB: DR 705.
template<typename... _Elements>
- inline tuple<typename __decay_and_strip<_Elements>::__type...>
+ constexpr tuple<typename __decay_and_strip<_Elements>::__type...>
make_tuple(_Elements&&... __args)
{
typedef tuple<typename __decay_and_strip<_Elements>::__type...>
return __result_type(std::forward<_Elements>(__args)...);
}
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 2275. Why is forward_as_tuple not constexpr?
+ /// std::forward_as_tuple
template<typename... _Elements>
- inline tuple<_Elements&&...>
+ constexpr tuple<_Elements&&...>
forward_as_tuple(_Elements&&... __args) noexcept
{ return tuple<_Elements&&...>(std::forward<_Elements>(__args)...); }
- template<std::size_t...> struct __index_holder { };
+ template<size_t, typename, typename, size_t>
+ struct __make_tuple_impl;
- template<std::size_t __i, typename _IdxHolder, typename... _Elements>
- struct __index_holder_impl;
+ template<size_t _Idx, typename _Tuple, typename... _Tp, size_t _Nm>
+ struct __make_tuple_impl<_Idx, tuple<_Tp...>, _Tuple, _Nm>
+ : __make_tuple_impl<_Idx + 1,
+ tuple<_Tp..., __tuple_element_t<_Idx, _Tuple>>,
+ _Tuple, _Nm>
+ { };
- template<std::size_t __i, std::size_t... _Indexes, typename _IdxHolder,
- typename... _Elements>
- struct __index_holder_impl<__i, __index_holder<_Indexes...>,
- _IdxHolder, _Elements...>
+ template<size_t _Nm, typename _Tuple, typename... _Tp>
+ struct __make_tuple_impl<_Nm, tuple<_Tp...>, _Tuple, _Nm>
{
- typedef typename __index_holder_impl<__i + 1,
- __index_holder<_Indexes..., __i>,
- _Elements...>::type type;
+ typedef tuple<_Tp...> __type;
};
-
- template<std::size_t __i, std::size_t... _Indexes>
- struct __index_holder_impl<__i, __index_holder<_Indexes...> >
- { typedef __index_holder<_Indexes...> type; };
- template<typename... _Elements>
- struct __make_index_holder
- : __index_holder_impl<0, __index_holder<>, _Elements...> { };
-
- template<typename... _TElements, std::size_t... _TIdx,
- typename... _UElements, std::size_t... _UIdx>
- inline tuple<_TElements..., _UElements...>
- __tuple_cat_helper(const tuple<_TElements...>& __t,
- const __index_holder<_TIdx...>&,
- const tuple<_UElements...>& __u,
- const __index_holder<_UIdx...>&)
- { return tuple<_TElements..., _UElements...>(get<_TIdx>(__t)...,
- get<_UIdx>(__u)...); }
-
- template<typename... _TElements, std::size_t... _TIdx,
- typename... _UElements, std::size_t... _UIdx>
- inline tuple<_TElements..., _UElements...>
- __tuple_cat_helper(tuple<_TElements...>&& __t,
- const __index_holder<_TIdx...>&,
- const tuple<_UElements...>& __u,
- const __index_holder<_UIdx...>&)
- { return tuple<_TElements..., _UElements...>
- (std::forward<_TElements>(get<_TIdx>(__t))..., get<_UIdx>(__u)...); }
-
- template<typename... _TElements, std::size_t... _TIdx,
- typename... _UElements, std::size_t... _UIdx>
- inline tuple<_TElements..., _UElements...>
- __tuple_cat_helper(const tuple<_TElements...>& __t,
- const __index_holder<_TIdx...>&,
- tuple<_UElements...>&& __u,
- const __index_holder<_UIdx...>&)
- { return tuple<_TElements..., _UElements...>
- (get<_TIdx>(__t)..., std::forward<_UElements>(get<_UIdx>(__u))...); }
-
- template<typename... _TElements, std::size_t... _TIdx,
- typename... _UElements, std::size_t... _UIdx>
- inline tuple<_TElements..., _UElements...>
- __tuple_cat_helper(tuple<_TElements...>&& __t,
- const __index_holder<_TIdx...>&,
- tuple<_UElements...>&& __u,
- const __index_holder<_UIdx...>&)
- { return tuple<_TElements..., _UElements...>
- (std::forward<_TElements>(get<_TIdx>(__t))...,
- std::forward<_UElements>(get<_UIdx>(__u))...); }
+ template<typename _Tuple>
+ struct __do_make_tuple
+ : __make_tuple_impl<0, tuple<>, _Tuple, tuple_size<_Tuple>::value>
+ { };
- template<typename... _TElements, typename... _UElements>
- inline tuple<_TElements..., _UElements...>
- tuple_cat(const tuple<_TElements...>& __t, const tuple<_UElements...>& __u)
+ // Returns the std::tuple equivalent of a tuple-like type.
+ template<typename _Tuple>
+ struct __make_tuple
+ : public __do_make_tuple<__remove_cvref_t<_Tuple>>
+ { };
+
+ // Combines several std::tuple's into a single one.
+ template<typename...>
+ struct __combine_tuples;
+
+ template<>
+ struct __combine_tuples<>
{
- return __tuple_cat_helper(__t, typename
- __make_index_holder<_TElements...>::type(),
- __u, typename
- __make_index_holder<_UElements...>::type());
- }
+ typedef tuple<> __type;
+ };
- template<typename... _TElements, typename... _UElements>
- inline tuple<_TElements..., _UElements...>
- tuple_cat(tuple<_TElements...>&& __t, const tuple<_UElements...>& __u)
+ template<typename... _Ts>
+ struct __combine_tuples<tuple<_Ts...>>
{
- return __tuple_cat_helper(std::move(__t), typename
- __make_index_holder<_TElements...>::type(),
- __u, typename
- __make_index_holder<_UElements...>::type());
- }
+ typedef tuple<_Ts...> __type;
+ };
- template<typename... _TElements, typename... _UElements>
- inline tuple<_TElements..., _UElements...>
- tuple_cat(const tuple<_TElements...>& __t, tuple<_UElements...>&& __u)
+ template<typename... _T1s, typename... _T2s, typename... _Rem>
+ struct __combine_tuples<tuple<_T1s...>, tuple<_T2s...>, _Rem...>
{
- return __tuple_cat_helper(__t, typename
- __make_index_holder<_TElements...>::type(),
- std::move(__u), typename
- __make_index_holder<_UElements...>::type());
- }
+ typedef typename __combine_tuples<tuple<_T1s..., _T2s...>,
+ _Rem...>::__type __type;
+ };
- template<typename... _TElements, typename... _UElements>
- inline tuple<_TElements..., _UElements...>
- tuple_cat(tuple<_TElements...>&& __t, tuple<_UElements...>&& __u)
+ // Computes the result type of tuple_cat given a set of tuple-like types.
+ template<typename... _Tpls>
+ struct __tuple_cat_result
+ {
+ typedef typename __combine_tuples
+ <typename __make_tuple<_Tpls>::__type...>::__type __type;
+ };
+
+ // Helper to determine the index set for the first tuple-like
+ // type of a given set.
+ template<typename...>
+ struct __make_1st_indices;
+
+ template<>
+ struct __make_1st_indices<>
{
- return __tuple_cat_helper(std::move(__t), typename
- __make_index_holder<_TElements...>::type(),
- std::move(__u), typename
- __make_index_holder<_UElements...>::type());
+ typedef _Index_tuple<> __type;
+ };
+
+ template<typename _Tp, typename... _Tpls>
+ struct __make_1st_indices<_Tp, _Tpls...>
+ {
+ typedef typename _Build_index_tuple<tuple_size<
+ typename remove_reference<_Tp>::type>::value>::__type __type;
+ };
+
+ // Performs the actual concatenation by step-wise expanding tuple-like
+ // objects into the elements, which are finally forwarded into the
+ // result tuple.
+ template<typename _Ret, typename _Indices, typename... _Tpls>
+ struct __tuple_concater;
+
+ template<typename _Ret, size_t... _Is, typename _Tp, typename... _Tpls>
+ struct __tuple_concater<_Ret, _Index_tuple<_Is...>, _Tp, _Tpls...>
+ {
+ template<typename... _Us>
+ static constexpr _Ret
+ _S_do(_Tp&& __tp, _Tpls&&... __tps, _Us&&... __us)
+ {
+ typedef typename __make_1st_indices<_Tpls...>::__type __idx;
+ typedef __tuple_concater<_Ret, __idx, _Tpls...> __next;
+ return __next::_S_do(std::forward<_Tpls>(__tps)...,
+ std::forward<_Us>(__us)...,
+ std::get<_Is>(std::forward<_Tp>(__tp))...);
+ }
+ };
+
+ template<typename _Ret>
+ struct __tuple_concater<_Ret, _Index_tuple<>>
+ {
+ template<typename... _Us>
+ static constexpr _Ret
+ _S_do(_Us&&... __us)
+ {
+ return _Ret(std::forward<_Us>(__us)...);
+ }
+ };
+
+ /// tuple_cat
+ template<typename... _Tpls, typename = typename
+ enable_if<__and_<__is_tuple_like<_Tpls>...>::value>::type>
+ constexpr auto
+ tuple_cat(_Tpls&&... __tpls)
+ -> typename __tuple_cat_result<_Tpls...>::__type
+ {
+ typedef typename __tuple_cat_result<_Tpls...>::__type __ret;
+ typedef typename __make_1st_indices<_Tpls...>::__type __idx;
+ typedef __tuple_concater<__ret, __idx, _Tpls...> __concater;
+ return __concater::_S_do(std::forward<_Tpls>(__tpls)...);
}
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 2301. Why is tie not constexpr?
+ /// tie
template<typename... _Elements>
- inline tuple<_Elements&...>
+ constexpr tuple<_Elements&...>
tie(_Elements&... __args) noexcept
{ return tuple<_Elements&...>(__args...); }
+ /// swap
template<typename... _Elements>
- inline void
+ _GLIBCXX20_CONSTEXPR
+ inline
+#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
+ // Constrained free swap overload, see p0185r1
+ typename enable_if<__and_<__is_swappable<_Elements>...>::value
+ >::type
+#else
+ void
+#endif
swap(tuple<_Elements...>& __x, tuple<_Elements...>& __y)
noexcept(noexcept(__x.swap(__y)))
{ __x.swap(__y); }
+#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
+ template<typename... _Elements>
+ _GLIBCXX20_CONSTEXPR
+ typename enable_if<!__and_<__is_swappable<_Elements>...>::value>::type
+ swap(tuple<_Elements...>&, tuple<_Elements...>&) = delete;
+#endif
+
// A class (and instance) which can be used in 'tie' when an element
- // of a tuple is not required
+ // of a tuple is not required.
+ // _GLIBCXX14_CONSTEXPR
+ // 2933. PR for LWG 2773 could be clearer
struct _Swallow_assign
{
template<class _Tp>
- const _Swallow_assign&
+ _GLIBCXX14_CONSTEXPR const _Swallow_assign&
operator=(const _Tp&) const
{ return *this; }
};
- const _Swallow_assign ignore{};
+ // _GLIBCXX_RESOLVE_LIB_DEFECTS
+ // 2773. Making std::ignore constexpr
+ _GLIBCXX17_INLINE constexpr _Swallow_assign ignore{};
/// Partial specialization for tuples
template<typename... _Types, typename _Alloc>
struct uses_allocator<tuple<_Types...>, _Alloc> : true_type { };
- /**
- * Stores a tuple of indices. Used by bind() to extract the elements
- * in a tuple.
- */
- template<int... _Indexes>
- struct _Index_tuple
- {
- typedef _Index_tuple<_Indexes..., sizeof...(_Indexes)> __next;
- };
-
- /// Builds an _Index_tuple<0, 1, 2, ..., _Num-1>.
- template<std::size_t _Num>
- struct _Build_index_tuple
- {
- typedef typename _Build_index_tuple<_Num-1>::__type::__next __type;
- };
-
- template<>
- struct _Build_index_tuple<0>
- {
- typedef _Index_tuple<> __type;
- };
-
// See stl_pair.h...
+ /** "piecewise construction" using a tuple of arguments for each member.
+ *
+ * @param __first Arguments for the first member of the pair.
+ * @param __second Arguments for the second member of the pair.
+ *
+ * The elements of each tuple will be used as the constructor arguments
+ * for the data members of the pair.
+ */
template<class _T1, class _T2>
- template<typename _Tp, typename... _Args>
- inline _Tp
+ template<typename... _Args1, typename... _Args2>
+ _GLIBCXX20_CONSTEXPR
+ inline
pair<_T1, _T2>::
- __cons(tuple<_Args...>&& __tuple)
- {
- typedef typename _Build_index_tuple<sizeof...(_Args)>::__type
- _Indexes;
- return __do_cons<_Tp>(std::move(__tuple), _Indexes());
- }
+ pair(piecewise_construct_t,
+ tuple<_Args1...> __first, tuple<_Args2...> __second)
+ : pair(__first, __second,
+ typename _Build_index_tuple<sizeof...(_Args1)>::__type(),
+ typename _Build_index_tuple<sizeof...(_Args2)>::__type())
+ { }
template<class _T1, class _T2>
- template<typename _Tp, typename... _Args, int... _Indexes>
- inline _Tp
+ template<typename... _Args1, size_t... _Indexes1,
+ typename... _Args2, size_t... _Indexes2>
+ _GLIBCXX20_CONSTEXPR inline
pair<_T1, _T2>::
- __do_cons(tuple<_Args...>&& __tuple,
- const _Index_tuple<_Indexes...>&)
- { return _Tp(std::forward<_Args>(get<_Indexes>(__tuple))...); }
+ pair(tuple<_Args1...>& __tuple1, tuple<_Args2...>& __tuple2,
+ _Index_tuple<_Indexes1...>, _Index_tuple<_Indexes2...>)
+ : first(std::forward<_Args1>(std::get<_Indexes1>(__tuple1))...),
+ second(std::forward<_Args2>(std::get<_Indexes2>(__tuple2))...)
+ { }
+
+#if __cplusplus >= 201703L
+
+ // Unpack a std::tuple into a type trait and use its value.
+ // For cv std::tuple<_Up> the result is _Trait<_Tp, cv _Up...>::value.
+ // For cv std::tuple<_Up>& the result is _Trait<_Tp, cv _Up&...>::value.
+ // Otherwise the result is false (because we don't know if std::get throws).
+ template<template<typename...> class _Trait, typename _Tp, typename _Tuple>
+ inline constexpr bool __unpack_std_tuple = false;
+
+ template<template<typename...> class _Trait, typename _Tp, typename... _Up>
+ inline constexpr bool __unpack_std_tuple<_Trait, _Tp, tuple<_Up...>>
+ = _Trait<_Tp, _Up...>::value;
+
+ template<template<typename...> class _Trait, typename _Tp, typename... _Up>
+ inline constexpr bool __unpack_std_tuple<_Trait, _Tp, tuple<_Up...>&>
+ = _Trait<_Tp, _Up&...>::value;
+
+ template<template<typename...> class _Trait, typename _Tp, typename... _Up>
+ inline constexpr bool __unpack_std_tuple<_Trait, _Tp, const tuple<_Up...>>
+ = _Trait<_Tp, const _Up...>::value;
+
+ template<template<typename...> class _Trait, typename _Tp, typename... _Up>
+ inline constexpr bool __unpack_std_tuple<_Trait, _Tp, const tuple<_Up...>&>
+ = _Trait<_Tp, const _Up&...>::value;
+
+# define __cpp_lib_apply 201603
+
+ template <typename _Fn, typename _Tuple, size_t... _Idx>
+ constexpr decltype(auto)
+ __apply_impl(_Fn&& __f, _Tuple&& __t, index_sequence<_Idx...>)
+ {
+ return std::__invoke(std::forward<_Fn>(__f),
+ std::get<_Idx>(std::forward<_Tuple>(__t))...);
+ }
+
+ template <typename _Fn, typename _Tuple>
+ constexpr decltype(auto)
+ apply(_Fn&& __f, _Tuple&& __t)
+ noexcept(__unpack_std_tuple<is_nothrow_invocable, _Fn, _Tuple>)
+ {
+ using _Indices
+ = make_index_sequence<tuple_size_v<remove_reference_t<_Tuple>>>;
+ return std::__apply_impl(std::forward<_Fn>(__f),
+ std::forward<_Tuple>(__t),
+ _Indices{});
+ }
+
+#define __cpp_lib_make_from_tuple 201606
+
+ template <typename _Tp, typename _Tuple, size_t... _Idx>
+ constexpr _Tp
+ __make_from_tuple_impl(_Tuple&& __t, index_sequence<_Idx...>)
+ { return _Tp(std::get<_Idx>(std::forward<_Tuple>(__t))...); }
+
+ template <typename _Tp, typename _Tuple>
+ constexpr _Tp
+ make_from_tuple(_Tuple&& __t)
+ noexcept(__unpack_std_tuple<is_nothrow_constructible, _Tp, _Tuple>)
+ {
+ return __make_from_tuple_impl<_Tp>(
+ std::forward<_Tuple>(__t),
+ make_index_sequence<tuple_size_v<remove_reference_t<_Tuple>>>{});
+ }
+#endif // C++17
+
+ /// @}
_GLIBCXX_END_NAMESPACE_VERSION
-} // namespace
+} // namespace std
-#endif // __GXX_EXPERIMENTAL_CXX0X__
+#endif // C++11
#endif // _GLIBCXX_TUPLE
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