// <tuple> -*- C++ -*-
-// Copyright (C) 2007-2018 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
#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)
{
= typename conditional<__is_final(_Tp), false_type,
__is_empty_non_tuple<_Tp>>::type;
- template<std::size_t _Idx, typename _Head,
+ 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
{
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(_UHead&& __h)
: _M_head_impl(std::forward<_UHead>(__h)) { }
+ _GLIBCXX20_CONSTEXPR
_Head_base(allocator_arg_t, __uses_alloc0)
: _M_head_impl() { }
: _M_head_impl(*__a._M_a) { }
template<typename _UHead>
+ _GLIBCXX20_CONSTEXPR
_Head_base(__uses_alloc0, _UHead&& __uhead)
: _M_head_impl(std::forward<_UHead>(__uhead)) { }
* point in the hierarchy; we use it to implement a constant-time
* get() operation.
*/
- template<std::size_t _Idx, typename... _Elements>
+ template<size_t _Idx, typename... _Elements>
struct _Tuple_impl;
/**
* 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>
{
- 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> _Base;
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
- enable_if<sizeof...(_Tail) == sizeof...(_UTail)>::type>
- explicit
- constexpr _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(__and_<is_nothrow_move_constructible<_Head>,
- is_nothrow_move_constructible<_Inherited>>::value)
+ is_nothrow_move_constructible<_Inherited>>::value)
: _Inherited(std::move(_M_tail(__in))),
- _Base(std::forward<_Head>(_M_head(__in))) { }
+ _Base(std::forward<_Head>(_M_head(__in)))
+ { }
template<typename... _UElements>
- constexpr _Tuple_impl(const _Tuple_impl<_Idx, _UElements...>& __in)
+ 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)) { }
+ _Base(_Tuple_impl<_Idx, _UElements...>::_M_head(__in))
+ { }
template<typename _UHead, typename... _UTails>
- constexpr _Tuple_impl(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
+ 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))) { }
+ (_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(__tag, __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)
: _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 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)
+ _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)) { }
+ _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)
+ _Tuple_impl&& __in)
: _Inherited(__tag, __a, std::move(_M_tail(__in))),
_Base(__use_alloc<_Head, _Alloc, _Head>(__a),
- std::forward<_Head>(_M_head(__in))) { }
+ 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)
+ const _Tuple_impl<_Idx, _UHead, _UTails...>& __in)
: _Inherited(__tag, __a,
- _Tuple_impl<_Idx, _UElements...>::_M_tail(__in)),
- _Base(__use_alloc<_Head, _Alloc, _Head>(__a),
- _Tuple_impl<_Idx, _UElements...>::_M_head(__in)) { }
+ _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)
+ _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>
- (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in))) { }
-
- _Tuple_impl&
- operator=(const _Tuple_impl& __in)
- {
- _M_head(*this) = _M_head(__in);
- _M_tail(*this) = _M_tail(__in);
- return *this;
- }
-
- _Tuple_impl&
- operator=(_Tuple_impl&& __in)
- noexcept(__and_<is_nothrow_move_assignable<_Head>,
- is_nothrow_move_assignable<_Inherited>>::value)
- {
- _M_head(*this) = std::forward<_Head>(_M_head(__in));
- _M_tail(*this) = std::move(_M_tail(__in));
- return *this;
- }
+ std::forward<_UHead>
+ (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in)))
+ { }
template<typename... _UElements>
- _Tuple_impl&
- operator=(const _Tuple_impl<_Idx, _UElements...>& __in)
- {
+ _GLIBCXX20_CONSTEXPR
+ void
+ _M_assign(const _Tuple_impl<_Idx, _UElements...>& __in)
+ {
_M_head(*this) = _Tuple_impl<_Idx, _UElements...>::_M_head(__in);
- _M_tail(*this) = _Tuple_impl<_Idx, _UElements...>::_M_tail(__in);
- return *this;
+ _M_tail(*this)._M_assign(
+ _Tuple_impl<_Idx, _UElements...>::_M_tail(__in));
}
template<typename _UHead, typename... _UTails>
- _Tuple_impl&
- operator=(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
- {
+ _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) = std::move
- (_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in));
- return *this;
+ _M_tail(*this)._M_assign(
+ std::move(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_tail(__in)));
}
protected:
+ _GLIBCXX20_CONSTEXPR
void
_M_swap(_Tuple_impl& __in)
- noexcept(__is_nothrow_swappable<_Head>::value
- && noexcept(_M_tail(__in)._M_swap(_M_tail(__in))))
{
using std::swap;
swap(_M_head(*this), _M_head(__in));
};
// Basis case of inheritance recursion.
- template<std::size_t _Idx, typename _Head>
+ template<size_t _Idx, typename _Head>
struct _Tuple_impl<_Idx, _Head>
: private _Head_base<_Idx, _Head>
{
- template<std::size_t, typename...> friend class _Tuple_impl;
+ template<size_t, typename...> friend struct _Tuple_impl;
typedef _Head_base<_Idx, _Head> _Base;
static constexpr const _Head&
_M_head(const _Tuple_impl& __t) noexcept { return _Base::_M_head(__t); }
- constexpr _Tuple_impl()
+ constexpr
+ _Tuple_impl()
: _Base() { }
- explicit
- constexpr _Tuple_impl(const _Head& __head)
- : _Base(__head) { }
+ explicit constexpr
+ _Tuple_impl(const _Head& __head)
+ : _Base(__head)
+ { }
template<typename _UHead>
- explicit
- constexpr _Tuple_impl(_UHead&& __head)
- : _Base(std::forward<_UHead>(__head)) { }
+ 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))) { }
+ : _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)) { }
+ 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)
+ 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)) { }
+ : _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, _Head>(__a), __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)
+ _UHead&& __head)
: _Base(__use_alloc<_Head, _Alloc, _UHead>(__a),
- std::forward<_UHead>(__head)) { }
+ std::forward<_UHead>(__head))
+ { }
template<typename _Alloc>
- _Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
- const _Tuple_impl& __in)
- : _Base(__use_alloc<_Head, _Alloc, _Head>(__a), _M_head(__in)) { }
+ _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)
+ _Tuple_impl&& __in)
: _Base(__use_alloc<_Head, _Alloc, _Head>(__a),
- std::forward<_Head>(_M_head(__in))) { }
+ 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, _Head>(__a),
- _Tuple_impl<_Idx, _UHead>::_M_head(__in)) { }
+ 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)
+ _Tuple_impl<_Idx, _UHead>&& __in)
: _Base(__use_alloc<_Head, _Alloc, _UHead>(__a),
- std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in)))
+ std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in)))
{ }
- _Tuple_impl&
- operator=(const _Tuple_impl& __in)
- {
- _M_head(*this) = _M_head(__in);
- return *this;
- }
-
- _Tuple_impl&
- operator=(_Tuple_impl&& __in)
- noexcept(is_nothrow_move_assignable<_Head>::value)
- {
- _M_head(*this) = std::forward<_Head>(_M_head(__in));
- return *this;
- }
-
template<typename _UHead>
- _Tuple_impl&
- operator=(const _Tuple_impl<_Idx, _UHead>& __in)
- {
+ _GLIBCXX20_CONSTEXPR
+ void
+ _M_assign(const _Tuple_impl<_Idx, _UHead>& __in)
+ {
_M_head(*this) = _Tuple_impl<_Idx, _UHead>::_M_head(__in);
- return *this;
}
template<typename _UHead>
- _Tuple_impl&
- operator=(_Tuple_impl<_Idx, _UHead>&& __in)
- {
+ _GLIBCXX20_CONSTEXPR
+ void
+ _M_assign(_Tuple_impl<_Idx, _UHead>&& __in)
+ {
_M_head(*this)
= std::forward<_UHead>(_Tuple_impl<_Idx, _UHead>::_M_head(__in));
- return *this;
}
protected:
+ _GLIBCXX20_CONSTEXPR
void
_M_swap(_Tuple_impl& __in)
- noexcept(__is_nothrow_swappable<_Head>::value)
{
using std::swap;
swap(_M_head(*this), _M_head(__in));
// Concept utility functions, reused in conditionally-explicit
// constructors.
- template<bool, typename... _Elements>
- struct _TC
- {
- template<typename... _UElements>
- static constexpr bool _ConstructibleTuple()
- {
- return __and_<is_constructible<_Elements, const _UElements&>...>::value;
- }
-
- template<typename... _UElements>
- static constexpr bool _ImplicitlyConvertibleTuple()
- {
- return __and_<is_convertible<const _UElements&, _Elements>...>::value;
- }
-
- template<typename... _UElements>
- static constexpr bool _MoveConstructibleTuple()
+ template<bool, typename... _Types>
+ struct _TupleConstraints
{
- return __and_<is_constructible<_Elements, _UElements&&>...>::value;
- }
-
- template<typename... _UElements>
- static constexpr bool _ImplicitlyMoveConvertibleTuple()
- {
- return __and_<is_convertible<_UElements&&, _Elements>...>::value;
- }
-
- template<typename _SrcTuple>
- static constexpr bool _NonNestedTuple()
- {
- return __and_<__not_<is_same<tuple<_Elements...>,
- typename remove_cv<
- typename remove_reference<_SrcTuple>::type
- >::type>>,
- __not_<is_convertible<_SrcTuple, _Elements...>>,
- __not_<is_constructible<_Elements..., _SrcTuple>>
- >::value;
- }
- template<typename... _UElements>
- static constexpr bool _NotSameTuple()
- {
- return __not_<is_same<tuple<_Elements...>,
- typename remove_const<
- typename remove_reference<_UElements...>::type
- >::type>>::value;
- }
- };
+ 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;
+ }
- template<typename... _Elements>
- struct _TC<false, _Elements...>
- {
- template<typename... _UElements>
- static constexpr bool _ConstructibleTuple()
- {
- return false;
- }
+ // 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;
+ }
- template<typename... _UElements>
- static constexpr bool _ImplicitlyConvertibleTuple()
- {
- return false;
- }
+ static constexpr bool __is_implicitly_default_constructible()
+ {
+ return __and_<std::__is_implicitly_default_constructible<_Types>...
+ >::value;
+ }
- template<typename... _UElements>
- static constexpr bool _MoveConstructibleTuple()
- {
- return false;
- }
+ static constexpr bool __is_explicitly_default_constructible()
+ {
+ return __and_<is_default_constructible<_Types>...,
+ __not_<__and_<
+ std::__is_implicitly_default_constructible<_Types>...>
+ >>::value;
+ }
+ };
- template<typename... _UElements>
- static constexpr bool _ImplicitlyMoveConvertibleTuple()
+ // Partial specialization used when a required precondition isn't met,
+ // e.g. when sizeof...(_Types) != sizeof...(_UTypes).
+ template<typename... _Types>
+ struct _TupleConstraints<false, _Types...>
{
- return false;
- }
+ template<typename... _UTypes>
+ static constexpr bool __is_implicitly_constructible()
+ { return false; }
- template<typename... _UElements>
- static constexpr bool _NonNestedTuple()
- {
- return true;
- }
- template<typename... _UElements>
- static constexpr bool _NotSameTuple()
- {
- return true;
- }
- };
+ template<typename... _UTypes>
+ static constexpr bool __is_explicitly_constructible()
+ { return false; }
+ };
/// Primary class template, tuple
template<typename... _Elements>
{
typedef _Tuple_impl<0, _Elements...> _Inherited;
- // Used for constraining the default constructor so
- // that it becomes dependent on the constraints.
- template<typename _Dummy>
- struct _TC2
- {
- static constexpr bool _DefaultConstructibleTuple()
- {
- return __and_<is_default_constructible<_Elements>...>::value;
- }
- static constexpr bool _ImplicitlyDefaultConstructibleTuple()
- {
- return __and_<__is_implicitly_default_constructible<_Elements>...>
- ::value;
- }
- };
+ 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>;
- public:
- template<typename _Dummy = void,
- typename enable_if<_TC2<_Dummy>::
- _ImplicitlyDefaultConstructibleTuple(),
- bool>::type = true>
- constexpr tuple()
- : _Inherited() { }
+ template<typename... _UElements>
+ static constexpr
+ __enable_if_t<sizeof...(_UElements) == sizeof...(_Elements), bool>
+ __assignable()
+ { return __and_<is_assignable<_Elements&, _UElements>...>::value; }
- template<typename _Dummy = void,
- typename enable_if<_TC2<_Dummy>::
- _DefaultConstructibleTuple()
- &&
- !_TC2<_Dummy>::
- _ImplicitlyDefaultConstructibleTuple(),
- bool>::type = false>
- explicit constexpr tuple()
- : _Inherited() { }
-
- // Shortcut for the cases where constructors taking _Elements...
- // need to be constrained.
- template<typename _Dummy> using _TCC =
- _TC<is_same<_Dummy, void>::value,
- _Elements...>;
+ // 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:
template<typename _Dummy = void,
- typename enable_if<
- _TCC<_Dummy>::template
- _ConstructibleTuple<_Elements...>()
- && _TCC<_Dummy>::template
- _ImplicitlyConvertibleTuple<_Elements...>()
- && (sizeof...(_Elements) >= 1),
- bool>::type=true>
- constexpr tuple(const _Elements&... __elements)
- : _Inherited(__elements...) { }
+ _ImplicitDefaultCtor<is_void<_Dummy>::value> = true>
+ constexpr
+ tuple()
+ noexcept(__and_<is_nothrow_default_constructible<_Elements>...>::value)
+ : _Inherited() { }
template<typename _Dummy = void,
- typename enable_if<
- _TCC<_Dummy>::template
- _ConstructibleTuple<_Elements...>()
- && !_TCC<_Dummy>::template
- _ImplicitlyConvertibleTuple<_Elements...>()
- && (sizeof...(_Elements) >= 1),
- bool>::type=false>
- explicit constexpr tuple(const _Elements&... __elements)
- : _Inherited(__elements...) { }
-
- // Shortcut for the cases where constructors taking _UElements...
- // need to be constrained.
- template<typename... _UElements> using _TMC =
- _TC<(sizeof...(_Elements) == sizeof...(_UElements))
- && (_TC<(sizeof...(_UElements)==1), _Elements...>::
- template _NotSameTuple<_UElements...>()),
- _Elements...>;
-
- // Shortcut for the cases where constructors taking tuple<_UElements...>
- // need to be constrained.
- template<typename... _UElements> using _TMCT =
- _TC<(sizeof...(_Elements) == sizeof...(_UElements))
- && !is_same<tuple<_Elements...>,
- tuple<_UElements...>>::value,
- _Elements...>;
-
- template<typename... _UElements, typename
- enable_if<
- _TMC<_UElements...>::template
- _MoveConstructibleTuple<_UElements...>()
- && _TMC<_UElements...>::template
- _ImplicitlyMoveConvertibleTuple<_UElements...>()
- && (sizeof...(_Elements) >= 1),
- bool>::type=true>
- constexpr tuple(_UElements&&... __elements)
- : _Inherited(std::forward<_UElements>(__elements)...) { }
-
- template<typename... _UElements, typename
- enable_if<
- _TMC<_UElements...>::template
- _MoveConstructibleTuple<_UElements...>()
- && !_TMC<_UElements...>::template
- _ImplicitlyMoveConvertibleTuple<_UElements...>()
- && (sizeof...(_Elements) >= 1),
- bool>::type=false>
- explicit constexpr tuple(_UElements&&... __elements)
+ _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;
constexpr tuple(tuple&&) = default;
- // Shortcut for the cases where constructors taking tuples
- // must avoid creating temporaries.
- template<typename _Dummy> using _TNTC =
- _TC<is_same<_Dummy, void>::value && sizeof...(_Elements) == 1,
- _Elements...>;
-
- template<typename... _UElements, typename _Dummy = void, typename
- enable_if<_TMCT<_UElements...>::template
- _ConstructibleTuple<_UElements...>()
- && _TMCT<_UElements...>::template
- _ImplicitlyConvertibleTuple<_UElements...>()
- && _TNTC<_Dummy>::template
- _NonNestedTuple<const tuple<_UElements...>&>(),
- bool>::type=true>
- constexpr tuple(const tuple<_UElements...>& __in)
- : _Inherited(static_cast<const _Tuple_impl<0, _UElements...>&>(__in))
- { }
-
- template<typename... _UElements, typename _Dummy = void, typename
- enable_if<_TMCT<_UElements...>::template
- _ConstructibleTuple<_UElements...>()
- && !_TMCT<_UElements...>::template
- _ImplicitlyConvertibleTuple<_UElements...>()
- && _TNTC<_Dummy>::template
- _NonNestedTuple<const tuple<_UElements...>&>(),
- bool>::type=false>
- explicit constexpr tuple(const tuple<_UElements...>& __in)
- : _Inherited(static_cast<const _Tuple_impl<0, _UElements...>&>(__in))
- { }
-
- template<typename... _UElements, typename _Dummy = void, typename
- enable_if<_TMCT<_UElements...>::template
- _MoveConstructibleTuple<_UElements...>()
- && _TMCT<_UElements...>::template
- _ImplicitlyMoveConvertibleTuple<_UElements...>()
- && _TNTC<_Dummy>::template
- _NonNestedTuple<tuple<_UElements...>&&>(),
- bool>::type=true>
- constexpr tuple(tuple<_UElements...>&& __in)
- : _Inherited(static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) { }
-
- template<typename... _UElements, typename _Dummy = void, typename
- enable_if<_TMCT<_UElements...>::template
- _MoveConstructibleTuple<_UElements...>()
- && !_TMCT<_UElements...>::template
- _ImplicitlyMoveConvertibleTuple<_UElements...>()
- && _TNTC<_Dummy>::template
- _NonNestedTuple<tuple<_UElements...>&&>(),
- bool>::type=false>
- explicit constexpr 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))
+ { }
+
+ 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... _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>
+ 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, typename _Dummy = void,
- typename enable_if<
- _TCC<_Dummy>::template
- _ConstructibleTuple<_Elements...>()
- && _TCC<_Dummy>::template
- _ImplicitlyConvertibleTuple<_Elements...>(),
- bool>::type=true>
+ 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, typename _Dummy = void,
- typename enable_if<
- _TCC<_Dummy>::template
- _ConstructibleTuple<_Elements...>()
- && !_TCC<_Dummy>::template
- _ImplicitlyConvertibleTuple<_Elements...>(),
- bool>::type=false>
- explicit tuple(allocator_arg_t __tag, const _Alloc& __a,
- const _Elements&... __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
- enable_if<_TMC<_UElements...>::template
- _MoveConstructibleTuple<_UElements...>()
- && _TMC<_UElements...>::template
- _ImplicitlyMoveConvertibleTuple<_UElements...>(),
- bool>::type=true>
+ 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, typename
- enable_if<_TMC<_UElements...>::template
- _MoveConstructibleTuple<_UElements...>()
- && !_TMC<_UElements...>::template
- _ImplicitlyMoveConvertibleTuple<_UElements...>(),
- bool>::type=false>
- explicit tuple(allocator_arg_t __tag, const _Alloc& __a,
+ { }
+
+ 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 _Dummy = void,
- typename... _UElements, typename
- enable_if<_TMCT<_UElements...>::template
- _ConstructibleTuple<_UElements...>()
- && _TMCT<_UElements...>::template
- _ImplicitlyConvertibleTuple<_UElements...>()
- && _TNTC<_Dummy>::template
- _NonNestedTuple<tuple<_UElements...>&&>(),
- bool>::type=true>
+ 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 _Dummy = void,
- typename... _UElements, typename
- enable_if<_TMCT<_UElements...>::template
- _ConstructibleTuple<_UElements...>()
- && !_TMCT<_UElements...>::template
- _ImplicitlyConvertibleTuple<_UElements...>()
- && _TNTC<_Dummy>::template
- _NonNestedTuple<tuple<_UElements...>&&>(),
- bool>::type=false>
- explicit tuple(allocator_arg_t __tag, const _Alloc& __a,
+ 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 _Dummy = void,
- typename... _UElements, typename
- enable_if<_TMCT<_UElements...>::template
- _MoveConstructibleTuple<_UElements...>()
- && _TMCT<_UElements...>::template
- _ImplicitlyMoveConvertibleTuple<_UElements...>()
- && _TNTC<_Dummy>::template
- _NonNestedTuple<tuple<_UElements...>&&>(),
- bool>::type=true>
+ 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 _Dummy = void,
- typename... _UElements, typename
- enable_if<_TMCT<_UElements...>::template
- _MoveConstructibleTuple<_UElements...>()
- && !_TMCT<_UElements...>::template
- _ImplicitlyMoveConvertibleTuple<_UElements...>()
- && _TNTC<_Dummy>::template
- _NonNestedTuple<tuple<_UElements...>&&>(),
- bool>::type=false>
- explicit tuple(allocator_arg_t __tag, const _Alloc& __a,
+ 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(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
- enable_if<sizeof...(_UElements)
- == sizeof...(_Elements), tuple&>::type
- operator=(const tuple<_UElements...>& __in)
- {
- static_cast<_Inherited&>(*this) = __in;
+ _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
- enable_if<sizeof...(_UElements)
- == sizeof...(_Elements), tuple&>::type
- operator=(tuple<_UElements...>&& __in)
- {
- static_cast<_Inherited&>(*this) = std::move(__in);
+ _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); }
};
tuple() = default;
// No-op allocator constructors.
template<typename _Alloc>
- tuple(allocator_arg_t, const _Alloc&) { }
+ _GLIBCXX20_CONSTEXPR
+ tuple(allocator_arg_t, const _Alloc&) noexcept { }
template<typename _Alloc>
- tuple(allocator_arg_t, const _Alloc&, const tuple&) { }
+ _GLIBCXX20_CONSTEXPR
+ tuple(allocator_arg_t, const _Alloc&, const tuple&) noexcept { }
};
/// Partial specialization, 2-element tuple.
{
typedef _Tuple_impl<0, _T1, _T2> _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>;
+
+ 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>
+ 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 <typename _U1 = _T1,
- typename _U2 = _T2,
- typename enable_if<__and_<
- __is_implicitly_default_constructible<_U1>,
- __is_implicitly_default_constructible<_U2>>
- ::value, bool>::type = true>
-
- constexpr tuple()
- : _Inherited() { }
-
- template <typename _U1 = _T1,
- typename _U2 = _T2,
- typename enable_if<
- __and_<
- is_default_constructible<_U1>,
- is_default_constructible<_U2>,
- __not_<
- __and_<__is_implicitly_default_constructible<_U1>,
- __is_implicitly_default_constructible<_U2>>>>
- ::value, bool>::type = false>
-
- explicit constexpr tuple()
- : _Inherited() { }
-
- // Shortcut for the cases where constructors taking _T1, _T2
- // need to be constrained.
- template<typename _Dummy> using _TCC =
- _TC<is_same<_Dummy, void>::value, _T1, _T2>;
-
- template<typename _Dummy = void, typename
- enable_if<_TCC<_Dummy>::template
- _ConstructibleTuple<_T1, _T2>()
- && _TCC<_Dummy>::template
- _ImplicitlyConvertibleTuple<_T1, _T2>(),
- bool>::type = true>
- constexpr tuple(const _T1& __a1, const _T2& __a2)
- : _Inherited(__a1, __a2) { }
-
- template<typename _Dummy = void, typename
- enable_if<_TCC<_Dummy>::template
- _ConstructibleTuple<_T1, _T2>()
- && !_TCC<_Dummy>::template
- _ImplicitlyConvertibleTuple<_T1, _T2>(),
- bool>::type = false>
- explicit constexpr tuple(const _T1& __a1, const _T2& __a2)
- : _Inherited(__a1, __a2) { }
-
- // Shortcut for the cases where constructors taking _U1, _U2
- // need to be constrained.
- using _TMC = _TC<true, _T1, _T2>;
-
- template<typename _U1, typename _U2, typename
- enable_if<_TMC::template
- _MoveConstructibleTuple<_U1, _U2>()
- && _TMC::template
- _ImplicitlyMoveConvertibleTuple<_U1, _U2>()
- && !is_same<typename decay<_U1>::type,
- allocator_arg_t>::value,
- bool>::type = true>
- constexpr tuple(_U1&& __a1, _U2&& __a2)
+ 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, typename
- enable_if<_TMC::template
- _MoveConstructibleTuple<_U1, _U2>()
- && !_TMC::template
- _ImplicitlyMoveConvertibleTuple<_U1, _U2>()
- && !is_same<typename decay<_U1>::type,
- allocator_arg_t>::value,
- bool>::type = false>
- explicit constexpr tuple(_U1&& __a1, _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;
constexpr tuple(tuple&&) = default;
- template<typename _U1, typename _U2, typename
- enable_if<_TMC::template
- _ConstructibleTuple<_U1, _U2>()
- && _TMC::template
- _ImplicitlyConvertibleTuple<_U1, _U2>(),
- bool>::type = true>
- constexpr tuple(const tuple<_U1, _U2>& __in)
+ 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, typename
- enable_if<_TMC::template
- _ConstructibleTuple<_U1, _U2>()
- && !_TMC::template
- _ImplicitlyConvertibleTuple<_U1, _U2>(),
- bool>::type = false>
- explicit constexpr tuple(const 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, typename
- enable_if<_TMC::template
- _MoveConstructibleTuple<_U1, _U2>()
- && _TMC::template
- _ImplicitlyMoveConvertibleTuple<_U1, _U2>(),
- bool>::type = true>
- constexpr tuple(tuple<_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, typename
- enable_if<_TMC::template
- _MoveConstructibleTuple<_U1, _U2>()
- && !_TMC::template
- _ImplicitlyMoveConvertibleTuple<_U1, _U2>(),
- bool>::type = false>
- explicit constexpr tuple(tuple<_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, typename
- enable_if<_TMC::template
- _ConstructibleTuple<_U1, _U2>()
- && _TMC::template
- _ImplicitlyConvertibleTuple<_U1, _U2>(),
- bool>::type = true>
- constexpr tuple(const pair<_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, typename
- enable_if<_TMC::template
- _ConstructibleTuple<_U1, _U2>()
- && !_TMC::template
- _ImplicitlyConvertibleTuple<_U1, _U2>(),
- bool>::type = false>
- explicit constexpr tuple(const 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, typename
- enable_if<_TMC::template
- _MoveConstructibleTuple<_U1, _U2>()
- && _TMC::template
- _ImplicitlyMoveConvertibleTuple<_U1, _U2>(),
- bool>::type = true>
- constexpr tuple(pair<_U1, _U2>&& __in)
+ 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)) { }
- template<typename _U1, typename _U2, typename
- enable_if<_TMC::template
- _MoveConstructibleTuple<_U1, _U2>()
- && !_TMC::template
- _ImplicitlyMoveConvertibleTuple<_U1, _U2>(),
- bool>::type = false>
- explicit constexpr tuple(pair<_U1, _U2>&& __in)
+ 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)) { }
// Allocator-extended constructors.
- template<typename _Alloc>
+ 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, typename _Dummy = void,
- typename enable_if<
- _TCC<_Dummy>::template
- _ConstructibleTuple<_T1, _T2>()
- && _TCC<_Dummy>::template
- _ImplicitlyConvertibleTuple<_T1, _T2>(),
- bool>::type=true>
-
+ 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, typename _Dummy = void,
- typename enable_if<
- _TCC<_Dummy>::template
- _ConstructibleTuple<_T1, _T2>()
- && !_TCC<_Dummy>::template
- _ImplicitlyConvertibleTuple<_T1, _T2>(),
- bool>::type=false>
-
- explicit tuple(allocator_arg_t __tag, const _Alloc& __a,
+ 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, typename
- enable_if<_TMC::template
- _MoveConstructibleTuple<_U1, _U2>()
- && _TMC::template
- _ImplicitlyMoveConvertibleTuple<_U1, _U2>(),
- bool>::type = true>
+ 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, typename
- enable_if<_TMC::template
- _MoveConstructibleTuple<_U1, _U2>()
- && !_TMC::template
- _ImplicitlyMoveConvertibleTuple<_U1, _U2>(),
- bool>::type = false>
- explicit tuple(allocator_arg_t __tag, const _Alloc& __a,
- _U1&& __a1, _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, typename
- enable_if<_TMC::template
- _ConstructibleTuple<_U1, _U2>()
- && _TMC::template
- _ImplicitlyConvertibleTuple<_U1, _U2>(),
- bool>::type = true>
+ 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, typename
- enable_if<_TMC::template
- _ConstructibleTuple<_U1, _U2>()
- && !_TMC::template
- _ImplicitlyConvertibleTuple<_U1, _U2>(),
- bool>::type = false>
- explicit tuple(allocator_arg_t __tag, const _Alloc& __a,
+ 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, typename
- enable_if<_TMC::template
- _MoveConstructibleTuple<_U1, _U2>()
- && _TMC::template
- _ImplicitlyMoveConvertibleTuple<_U1, _U2>(),
- bool>::type = true>
+ 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, typename
- enable_if<_TMC::template
- _MoveConstructibleTuple<_U1, _U2>()
- && !_TMC::template
- _ImplicitlyMoveConvertibleTuple<_U1, _U2>(),
- bool>::type = false>
- explicit tuple(allocator_arg_t __tag, const _Alloc& __a,
- tuple<_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, typename
- enable_if<_TMC::template
- _ConstructibleTuple<_U1, _U2>()
- && _TMC::template
- _ImplicitlyConvertibleTuple<_U1, _U2>(),
- bool>::type = true>
- 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, typename
- enable_if<_TMC::template
- _ConstructibleTuple<_U1, _U2>()
- && !_TMC::template
- _ImplicitlyConvertibleTuple<_U1, _U2>(),
- bool>::type = false>
- explicit tuple(allocator_arg_t __tag, const _Alloc& __a,
+ 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, typename
- enable_if<_TMC::template
- _MoveConstructibleTuple<_U1, _U2>()
- && _TMC::template
- _ImplicitlyMoveConvertibleTuple<_U1, _U2>(),
- bool>::type = true>
- 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, typename
- enable_if<_TMC::template
- _MoveConstructibleTuple<_U1, _U2>()
- && !_TMC::template
- _ImplicitlyMoveConvertibleTuple<_U1, _U2>(),
- bool>::type = false>
- explicit tuple(allocator_arg_t __tag, const _Alloc& __a,
- pair<_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, 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(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)
- {
+ _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)
- {
+ _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); }
};
/// class tuple_size
template<typename... _Elements>
struct tuple_size<tuple<_Elements...>>
- : public integral_constant<std::size_t, sizeof...(_Elements)> { };
+ : public integral_constant<size_t, sizeof...(_Elements)> { };
#if __cplusplus > 201402L
template <typename _Tp>
* 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...> > { };
"tuple index is in range");
};
-#if __cplusplus >= 201402L
-#define __cpp_lib_tuple_element_t 201402L
-
- template<size_t __i, typename _Tp>
- using tuple_element_t = typename tuple_element<__i, _Tp>::type;
-#endif
-
- template<std::size_t __i, typename _Head, typename... _Tail>
+ template<size_t __i, typename _Head, typename... _Tail>
constexpr _Head&
__get_helper(_Tuple_impl<__i, _Head, _Tail...>& __t) noexcept
{ return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); }
- template<std::size_t __i, typename _Head, typename... _Tail>
+ template<size_t __i, typename _Head, typename... _Tail>
constexpr const _Head&
__get_helper(const _Tuple_impl<__i, _Head, _Tail...>& __t) noexcept
{ return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); }
/// Return a reference to the ith element of a tuple.
- template<std::size_t __i, typename... _Elements>
+ template<size_t __i, typename... _Elements>
constexpr __tuple_element_t<__i, tuple<_Elements...>>&
get(tuple<_Elements...>& __t) noexcept
{ return std::__get_helper<__i>(__t); }
/// Return a const reference to the ith element of a const tuple.
- template<std::size_t __i, typename... _Elements>
+ template<size_t __i, typename... _Elements>
constexpr const __tuple_element_t<__i, tuple<_Elements...>>&
get(const tuple<_Elements...>& __t) noexcept
{ return std::__get_helper<__i>(__t); }
/// Return an rvalue reference to the ith element of a tuple rvalue.
- template<std::size_t __i, typename... _Elements>
+ template<size_t __i, typename... _Elements>
constexpr __tuple_element_t<__i, tuple<_Elements...>>&&
get(tuple<_Elements...>&& __t) noexcept
{
}
/// Return a const rvalue reference to the ith element of a const tuple rvalue.
- template<std::size_t __i, typename... _Elements>
+ template<size_t __i, typename... _Elements>
constexpr const __tuple_element_t<__i, tuple<_Elements...>>&&
get(const tuple<_Elements...>&& __t) noexcept
{
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>
constexpr bool
operator<(const tuple<_TElements...>& __t,
operator>=(const tuple<_TElements...>& __t,
const tuple<_UElements...>& __u)
{ return !(__t < __u); }
+#endif // three_way_comparison
// NB: DR 705.
template<typename... _Elements>
_Tuple, _Nm>
{ };
- template<std::size_t _Nm, typename _Tuple, typename... _Tp>
+ template<size_t _Nm, typename _Tuple, typename... _Tp>
struct __make_tuple_impl<_Nm, tuple<_Tp...>, _Tuple, _Nm>
{
typedef tuple<_Tp...> __type;
template<typename _Tuple>
struct __do_make_tuple
- : __make_tuple_impl<0, tuple<>, _Tuple, std::tuple_size<_Tuple>::value>
+ : __make_tuple_impl<0, tuple<>, _Tuple, tuple_size<_Tuple>::value>
{ };
// Returns the std::tuple equivalent of a tuple-like type.
template<>
struct __make_1st_indices<>
{
- typedef std::_Index_tuple<> __type;
+ typedef _Index_tuple<> __type;
};
template<typename _Tp, typename... _Tpls>
struct __make_1st_indices<_Tp, _Tpls...>
{
- typedef typename std::_Build_index_tuple<std::tuple_size<
- typename std::remove_reference<_Tp>::type>::value>::__type __type;
+ 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
template<typename _Ret, typename _Indices, typename... _Tpls>
struct __tuple_concater;
- template<typename _Ret, std::size_t... _Is, typename _Tp, typename... _Tpls>
- struct __tuple_concater<_Ret, std::_Index_tuple<_Is...>, _Tp, _Tpls...>
+ 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
};
template<typename _Ret>
- struct __tuple_concater<_Ret, std::_Index_tuple<>>
+ struct __tuple_concater<_Ret, _Index_tuple<>>
{
template<typename... _Us>
static constexpr _Ret
/// swap
template<typename... _Elements>
+ _GLIBCXX20_CONSTEXPR
inline
#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
// Constrained free swap overload, see p0185r1
#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
struct uses_allocator<tuple<_Types...>, _Alloc> : true_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... _Args1, typename... _Args2>
+ _GLIBCXX20_CONSTEXPR
inline
pair<_T1, _T2>::
pair(piecewise_construct_t,
{ }
template<class _T1, class _T2>
- template<typename... _Args1, std::size_t... _Indexes1,
- typename... _Args2, std::size_t... _Indexes2>
- inline
+ template<typename... _Args1, size_t... _Indexes1,
+ typename... _Args2, size_t... _Indexes2>
+ _GLIBCXX20_CONSTEXPR inline
pair<_T1, _T2>::
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))...)
+ second(std::forward<_Args2>(std::get<_Indexes2>(__tuple2))...)
{ }
-#if __cplusplus > 201402L
+#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>
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<decay_t<_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{});
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<decay_t<_Tuple>>>{});
+ make_index_sequence<tuple_size_v<remove_reference_t<_Tuple>>>{});
}
#endif // C++17
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