struct __add_r_ref<_Tp&>
{ typedef _Tp& type; };
+ // To work around c++/49225 aka c++/48322.
+ template<typename...>
+ struct __conv_types { };
+
+ template<typename _Tuple1, typename _Tuple2>
+ struct __one_by_one_convertible
+ : public false_type { };
+
+ template<typename _Tp, typename _Up>
+ struct __one_by_one_convertible<__conv_types<_Tp>, __conv_types<_Up>>
+ : public is_convertible<_Tp, _Up>::type { };
+
+ template<typename _T1, typename... _TR, typename _U1, typename... _UR>
+ struct __one_by_one_convertible<__conv_types<_T1, _TR...>,
+ __conv_types<_U1, _UR...>>
+ : public __and_<is_convertible<_T1, _U1>,
+ __one_by_one_convertible<__conv_types<_TR...>,
+ __conv_types<_UR...>>>::type
+ { };
+
+ template<typename _Tuple1, typename _Tuple2>
+ struct __all_convertible;
+
+ template<typename... _TTypes, typename... _UTypes>
+ struct __all_convertible<__conv_types<_TTypes...>,
+ __conv_types<_UTypes...>>
+ : public __one_by_one_convertible<__conv_types<_TTypes...>,
+ __conv_types<_UTypes...>>::type { };
+
template<std::size_t _Idx, typename _Head, bool _IsEmpty>
struct _Head_base;
template<typename _UHead, typename = typename
enable_if<!is_convertible<_UHead,
__uses_alloc_base>::value>::type>
- _Head_base(_UHead&& __h)
+ constexpr _Head_base(_UHead&& __h)
: _Head(std::forward<_UHead>(__h)) { }
_Head_base(__uses_alloc0)
_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; }
};
template<std::size_t _Idx, typename _Head>
template<typename _UHead, typename = typename
enable_if<!is_convertible<_UHead,
__uses_alloc_base>::value>::type>
- _Head_base(_UHead&& __h)
+ constexpr _Head_base(_UHead&& __h)
: _M_head_impl(std::forward<_UHead>(__h)) { }
_Head_base(__uses_alloc0)
_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;
};
/**
typedef _Tuple_impl<_Idx + 1, _Tail...> _Inherited;
typedef _Head_base<_Idx, _Head, std::is_empty<_Head>::value> _Base;
- _Head& _M_head() noexcept { return _Base::_M_head(); }
- const _Head& _M_head() const noexcept { return _Base::_M_head(); }
+ static constexpr _Head&
+ _M_head(_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 const _Head&
+ _M_head(const _Tuple_impl& __t) noexcept { return _Base::_M_head(__t); }
+
+ 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() { }
: _Inherited(__tail...), _Base(__head) { }
template<typename _UHead, typename... _UTail, typename = typename
- std::enable_if<sizeof...(_Tail)==sizeof...(_UTail)>::type>
+ enable_if<sizeof...(_Tail) == sizeof...(_UTail)>::type>
explicit
- _Tuple_impl(_UHead&& __head, _UTail&&... __tail)
+ constexpr _Tuple_impl(_UHead&& __head, _UTail&&... __tail)
: _Inherited(std::forward<_UTail>(__tail)...),
_Base(std::forward<_UHead>(__head)) { }
constexpr _Tuple_impl(const _Tuple_impl&) = default;
+ 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>
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __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) { }
template<typename _Alloc, typename _UHead, typename... _UTail,
- typename = typename std::enable_if<sizeof...(_Tail)
- ==sizeof...(_UTail)>::type>
+ typename = typename enable_if<sizeof...(_Tail)
+ == sizeof...(_UTail)>::type>
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
_UHead&& __head, _UTail&&... __tail)
: _Inherited(__tag, __a, std::forward<_UTail>(__tail)...),
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()) { }
+ : _Inherited(__tag, __a, _M_tail(__in)),
+ _Base(__use_alloc<_Head, _Alloc, _Head>(__a), _M_head(__in)) { }
template<typename _Alloc>
_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())),
+ : _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>
_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()) { }
+ : _Inherited(__tag, __a,
+ _Tuple_impl<_Idx, _UElements...>::_M_tail(__in)),
+ _Base(__use_alloc<_Head, _Alloc, _Head>(__a),
+ _Tuple_impl<_Idx, _UElements...>::_M_head(__in)) { }
template<typename _Alloc, typename _UHead, typename... _UTails>
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
_Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
- : _Inherited(__tag, __a, std::move(__in._M_tail())),
+ : _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();
+ _M_head(*this) = _M_head(__in);
+ _M_tail(*this) = _M_tail(__in);
return *this;
}
_Tuple_impl&
operator=(_Tuple_impl&& __in)
- noexcept(std::is_nothrow_move_assignable<_Head>::value
- && std::is_nothrow_move_assignable<_Inherited>::value)
+ noexcept(__and_<is_nothrow_move_assignable<_Head>,
+ is_nothrow_move_assignable<_Inherited>>::value)
{
- _M_head() = std::forward<_Head>(__in._M_head());
- _M_tail() = std::move(__in._M_tail());
+ _M_head(*this) = std::forward<_Head>(_M_head(__in));
+ _M_tail(*this) = std::move(_M_tail(__in));
return *this;
}
_Tuple_impl&
operator=(const _Tuple_impl<_Idx, _UElements...>& __in)
{
- _M_head() = __in._M_head();
- _M_tail() = __in._M_tail();
+ _M_head(*this) = _Tuple_impl<_Idx, _UElements...>::_M_head(__in);
+ _M_tail(*this) = _Tuple_impl<_Idx, _UElements...>::_M_tail(__in);
return *this;
}
_Tuple_impl&
operator=(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
{
- _M_head() = std::forward<_UHead>(__in._M_head());
- _M_tail() = std::move(__in._M_tail());
+ _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_swap(_Tuple_impl& __in)
noexcept(noexcept(swap(std::declval<_Head&>(),
std::declval<_Head&>()))
- && noexcept(__in._M_tail()._M_swap(__in._M_tail())))
+ && noexcept(_M_tail(__in)._M_swap(_M_tail(__in))))
{
using std::swap;
- swap(this->_M_head(), __in._M_head());
- _Inherited::_M_swap(__in._M_tail());
+ swap(_M_head(*this), _M_head(__in));
+ _Inherited::_M_swap(_M_tail(__in));
}
};
- /// tuple
+ /// Primary class template, tuple
template<typename... _Elements>
class tuple : public _Tuple_impl<0, _Elements...>
{
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... _UElements,
+ typename = typename enable_if<sizeof...(_UElements)
+ == sizeof...(_Elements)>::type,
+ typename = typename
+ enable_if<__all_convertible<__conv_types<_UElements...>,
+ __conv_types<_Elements...> >::value
+ >::type>
+ explicit
+ constexpr tuple(_UElements&&... __elements)
: _Inherited(std::forward<_UElements>(__elements)...) { }
constexpr tuple(const tuple&) = default;
- tuple(tuple&&) = default;
+
+ constexpr tuple(tuple&&) = default;
template<typename... _UElements, typename = typename
- std::enable_if<sizeof...(_UElements)
- == sizeof...(_Elements)>::type>
- tuple(const tuple<_UElements...>& __in)
+ enable_if<__and_<integral_constant<bool, sizeof...(_UElements)
+ == sizeof...(_Elements)>,
+ __all_convertible<__conv_types<const _UElements&...>,
+ __conv_types<_Elements...>>
+ >::value>::type>
+ constexpr tuple(const tuple<_UElements...>& __in)
: _Inherited(static_cast<const _Tuple_impl<0, _UElements...>&>(__in))
{ }
template<typename... _UElements, typename = typename
- std::enable_if<sizeof...(_UElements)
- == sizeof...(_Elements)>::type>
- tuple(tuple<_UElements...>&& __in)
+ enable_if<__and_<integral_constant<bool, sizeof...(_UElements)
+ == sizeof...(_Elements)>,
+ __all_convertible<__conv_types<_UElements...>,
+ __conv_types<_Elements...>>
+ >::value>::type>
+ constexpr tuple(tuple<_UElements...>&& __in)
: _Inherited(static_cast<_Tuple_impl<0, _UElements...>&&>(__in)) { }
- // allocator-extended constructors
+ // Allocator-extended constructors.
template<typename _Alloc>
tuple(allocator_arg_t __tag, const _Alloc& __a)
: _Inherited(__tag, __a, __elements...) { }
template<typename _Alloc, typename... _UElements, typename = typename
- std::enable_if<sizeof...(_UElements)
- == sizeof...(_Elements)>::type>
+ enable_if<sizeof...(_UElements)
+ == sizeof...(_Elements)>::type>
tuple(allocator_arg_t __tag, const _Alloc& __a,
_UElements&&... __elements)
: _Inherited(__tag, __a, std::forward<_UElements>(__elements)...)
: _Inherited(__tag, __a, static_cast<_Inherited&&>(__in)) { }
template<typename _Alloc, typename... _UElements, typename = typename
- std::enable_if<sizeof...(_UElements)
- == sizeof...(_Elements)>::type>
+ enable_if<sizeof...(_UElements)
+ == sizeof...(_Elements)>::type>
tuple(allocator_arg_t __tag, const _Alloc& __a,
const tuple<_UElements...>& __in)
: _Inherited(__tag, __a,
{ }
template<typename _Alloc, typename... _UElements, typename = typename
- std::enable_if<sizeof...(_UElements)
- == sizeof...(_Elements)>::type>
+ enable_if<sizeof...(_UElements)
+ == sizeof...(_Elements)>::type>
tuple(allocator_arg_t __tag, const _Alloc& __a,
tuple<_UElements...>&& __in)
: _Inherited(__tag, __a,
tuple&
operator=(tuple&& __in)
- noexcept(std::is_nothrow_move_assignable<_Inherited>::value)
+ noexcept(is_nothrow_move_assignable<_Inherited>::value)
{
static_cast<_Inherited&>(*this) = std::move(__in);
return *this;
}
template<typename... _UElements, typename = typename
- std::enable_if<sizeof...(_UElements)
- == sizeof...(_Elements)>::type>
+ enable_if<sizeof...(_UElements)
+ == sizeof...(_Elements)>::type>
tuple&
operator=(const tuple<_UElements...>& __in)
{
}
template<typename... _UElements, typename = typename
- std::enable_if<sizeof...(_UElements)
- == sizeof...(_Elements)>::type>
+ enable_if<sizeof...(_UElements)
+ == sizeof...(_Elements)>::type>
tuple&
operator=(tuple<_UElements...>&& __in)
{
{ _Inherited::_M_swap(__in); }
};
+ // Explicit specialization, zero-element tuple.
template<>
class tuple<>
{
void swap(tuple&) noexcept { /* no-op */ }
};
- /// 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>
{
constexpr tuple(const _T1& __a1, const _T2& __a2)
: _Inherited(__a1, __a2) { }
- template<typename _U1, typename _U2>
+ template<typename _U1, typename _U2, typename = typename
+ enable_if<__and_<is_convertible<_U1, _T1>,
+ is_convertible<_U2, _T2>>::value>::type>
explicit
- tuple(_U1&& __a1, _U2&& __a2)
+ constexpr tuple(_U1&& __a1, _U2&& __a2)
: _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, typename = typename
+ enable_if<__and_<is_convertible<const _U1&, _T1>,
+ is_convertible<const _U2&, _T2>>::value>::type>
+ constexpr tuple(const tuple<_U1, _U2>& __in)
: _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, typename = typename
+ enable_if<__and_<is_convertible<_U1, _T1>,
+ is_convertible<_U2, _T2>>::value>::type>
+ constexpr tuple(tuple<_U1, _U2>&& __in)
: _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, typename = typename
+ enable_if<__and_<is_convertible<const _U1&, _T1>,
+ is_convertible<const _U2&, _T2>>::value>::type>
+ constexpr tuple(const pair<_U1, _U2>& __in)
: _Inherited(__in.first, __in.second) { }
- template<typename _U1, typename _U2>
- tuple(pair<_U1, _U2>&& __in)
+ template<typename _U1, typename _U2, typename = typename
+ enable_if<__and_<is_convertible<_U1, _T1>,
+ is_convertible<_U2, _T2>>::value>::type>
+ constexpr tuple(pair<_U1, _U2>&& __in)
: _Inherited(std::forward<_U1>(__in.first),
std::forward<_U2>(__in.second)) { }
- // allocator-extended constructors
+ // Allocator-extended constructors.
template<typename _Alloc>
tuple(allocator_arg_t __tag, const _Alloc& __a)
tuple&
operator=(tuple&& __in)
- noexcept(std::is_nothrow_move_assignable<_Inherited>::value)
+ noexcept(is_nothrow_move_assignable<_Inherited>::value)
{
static_cast<_Inherited&>(*this) = std::move(__in);
return *this;
tuple&
operator=(const pair<_U1, _U2>& __in)
{
- this->_M_head() = __in.first;
- this->_M_tail()._M_head() = __in.second;
+ this->_M_head(*this) = __in.first;
+ this->_M_tail(*this)._M_head(*this) = __in.second;
return *this;
}
tuple&
operator=(pair<_U1, _U2>&& __in)
{
- this->_M_head() = std::forward<_U1>(__in.first);
- this->_M_tail()._M_head() = std::forward<_U2>(__in.second);
- return *this;
- }
-
- void
- swap(tuple& __in)
- noexcept(noexcept(__in._M_swap(__in)))
- { _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);
+ this->_M_head(*this) = std::forward<_U1>(__in.first);
+ this->_M_tail(*this)._M_head(*this) = std::forward<_U2>(__in.second);
return *this;
}
: public integral_constant<std::size_t, sizeof...(_Elements)> { };
template<std::size_t __i, typename _Head, typename... _Tail>
- inline typename __add_ref<_Head>::type
+ constexpr typename __add_ref<_Head>::type
__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
+ constexpr typename __add_c_ref<_Head>::type
__get_helper(const _Tuple_impl<__i, _Head, _Tail...>& __t) noexcept
- { return __t._M_head(); }
+ { return _Tuple_impl<__i, _Head, _Tail...>::_M_head(__t); }
// 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<
+ constexpr typename __add_ref<
typename tuple_element<__i, tuple<_Elements...>>::type
>::type
get(tuple<_Elements...>& __t) noexcept
{ return __get_helper<__i>(__t); }
template<std::size_t __i, typename... _Elements>
- inline typename __add_c_ref<
+ constexpr typename __add_c_ref<
typename tuple_element<__i, tuple<_Elements...>>::type
>::type
get(const tuple<_Elements...>& __t) noexcept
{ return __get_helper<__i>(__t); }
template<std::size_t __i, typename... _Elements>
- inline typename __add_r_ref<
+ constexpr typename __add_r_ref<
typename tuple_element<__i, tuple<_Elements...>>::type
>::type
get(tuple<_Elements...>&& __t) noexcept
template<std::size_t __i, std::size_t __j, typename _Tp, typename _Up>
struct __tuple_compare<0, __i, __j, _Tp, _Up>
{
- static bool __eq(const _Tp& __t, const _Up& __u)
+ static 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));
}
- static bool __less(const _Tp& __t, const _Up& __u)
+ static bool
+ __less(const _Tp& __t, const _Up& __u)
{
return ((get<__i>(__t) < get<__i>(__u))
|| !(get<__i>(__u) < get<__i>(__t)) &&
template<std::size_t __i, typename _Tp, typename _Up>
struct __tuple_compare<0, __i, __i, _Tp, _Up>
{
- static bool __eq(const _Tp&, const _Up&)
- { return true; }
+ static bool
+ __eq(const _Tp&, const _Up&) { return true; }
- static bool __less(const _Tp&, const _Up&)
- { return false; }
+ static bool
+ __less(const _Tp&, const _Up&) { return false; }
};
template<typename... _TElements, typename... _UElements>
// 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...>
}
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<std::size_t __i, typename _IdxHolder, typename... _Elements>
- struct __index_holder_impl;
+ template<typename, std::size_t> struct array;
+
+ template<std::size_t _Int, typename _Tp, std::size_t _Nm>
+ constexpr _Tp& get(array<_Tp, _Nm>&) noexcept;
- template<std::size_t __i, std::size_t... _Indexes, typename _IdxHolder,
- typename... _Elements>
- struct __index_holder_impl<__i, __index_holder<_Indexes...>,
- _IdxHolder, _Elements...>
+ template<std::size_t _Int, typename _Tp, std::size_t _Nm>
+ constexpr _Tp&& get(array<_Tp, _Nm>&&) noexcept;
+
+ template<std::size_t _Int, typename _Tp, std::size_t _Nm>
+ constexpr const _Tp& get(const array<_Tp, _Nm>&) noexcept;
+
+ template<typename>
+ struct __is_tuple_like_impl : false_type
+ { };
+
+ template<typename... _Tps>
+ struct __is_tuple_like_impl<tuple<_Tps...>> : true_type
+ { };
+
+ template<typename _T1, typename _T2>
+ struct __is_tuple_like_impl<pair<_T1, _T2>> : true_type
+ { };
+
+ template<typename _Tp, std::size_t _Nm>
+ struct __is_tuple_like_impl<array<_Tp, _Nm>> : true_type
+ { };
+
+ // Internal type trait that allows us to sfinae-protect tuple_cat.
+ template<typename _Tp>
+ struct __is_tuple_like
+ : public __is_tuple_like_impl<typename std::remove_cv
+ <typename std::remove_reference<_Tp>::type>::type>::type
+ { };
+
+ // Stores a tuple of indices. Also used by bind() to extract the elements
+ // in a tuple.
+ template<std::size_t... _Indexes>
+ struct _Index_tuple
{
- typedef typename __index_holder_impl<__i + 1,
- __index_holder<_Indexes..., __i>,
- _Elements...>::type type;
+ typedef _Index_tuple<_Indexes..., sizeof...(_Indexes)> __next;
};
-
- 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))...); }
+ // 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<typename... _TElements, typename... _UElements>
- inline tuple<_TElements..., _UElements...>
- tuple_cat(const tuple<_TElements...>& __t, const tuple<_UElements...>& __u)
+ template<>
+ struct _Build_index_tuple<0>
{
- return __tuple_cat_helper(__t, typename
- __make_index_holder<_TElements...>::type(),
- __u, typename
- __make_index_holder<_UElements...>::type());
- }
+ typedef _Index_tuple<> __type;
+ };
- template<typename... _TElements, typename... _UElements>
- inline tuple<_TElements..., _UElements...>
- tuple_cat(tuple<_TElements...>&& __t, const tuple<_UElements...>& __u)
+ template<std::size_t, typename, typename, std::size_t>
+ struct __make_tuple_impl;
+
+ template<std::size_t _Idx, typename _Tuple, typename... _Tp,
+ std::size_t _Nm>
+ struct __make_tuple_impl<_Idx, tuple<_Tp...>, _Tuple, _Nm>
{
- return __tuple_cat_helper(std::move(__t), typename
- __make_index_holder<_TElements...>::type(),
- __u, typename
- __make_index_holder<_UElements...>::type());
- }
+ typedef typename __make_tuple_impl<_Idx + 1, tuple<_Tp...,
+ typename std::tuple_element<_Idx, _Tuple>::type>, _Tuple, _Nm>::__type
+ __type;
+ };
- template<typename... _TElements, typename... _UElements>
- inline tuple<_TElements..., _UElements...>
- tuple_cat(const tuple<_TElements...>& __t, tuple<_UElements...>&& __u)
+ template<std::size_t _Nm, typename _Tuple, typename... _Tp>
+ struct __make_tuple_impl<_Nm, tuple<_Tp...>, _Tuple, _Nm>
{
- return __tuple_cat_helper(__t, typename
- __make_index_holder<_TElements...>::type(),
- std::move(__u), typename
- __make_index_holder<_UElements...>::type());
- }
+ typedef tuple<_Tp...> __type;
+ };
- template<typename... _TElements, typename... _UElements>
- inline tuple<_TElements..., _UElements...>
- tuple_cat(tuple<_TElements...>&& __t, tuple<_UElements...>&& __u)
+ template<typename _Tuple>
+ struct __do_make_tuple
+ : public __make_tuple_impl<0, tuple<>, _Tuple,
+ std::tuple_size<_Tuple>::value>
+ { };
+
+ // Returns the std::tuple equivalent of a tuple-like type.
+ template<typename _Tuple>
+ struct __make_tuple
+ : public __do_make_tuple<typename std::remove_cv
+ <typename std::remove_reference<_Tuple>::type>::type>
+ { };
+
+ // Combines several std::tuple's into a single one.
+ template<typename...>
+ struct __combine_tuples;
+
+ template<>
+ struct __combine_tuples<>
+ {
+ typedef tuple<> __type;
+ };
+
+ template<typename... _Ts>
+ struct __combine_tuples<tuple<_Ts...>>
+ {
+ typedef tuple<_Ts...> __type;
+ };
+
+ template<typename... _T1s, typename... _T2s, typename... _Rem>
+ struct __combine_tuples<tuple<_T1s...>, tuple<_T2s...>, _Rem...>
+ {
+ typedef typename __combine_tuples<tuple<_T1s..., _T2s...>,
+ _Rem...>::__type __type;
+ };
+
+ // 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 std::_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;
+ };
+
+ // 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, std::size_t... _Is, typename _Tp, typename... _Tpls>
+ struct __tuple_concater<_Ret, std::_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, std::_Index_tuple<>>
+ {
+ template<typename... _Us>
+ static constexpr _Ret
+ _S_do(_Us&&... __us)
+ {
+ return _Ret(std::forward<_Us>(__us)...);
+ }
+ };
+
+ 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)...);
}
template<typename... _Elements>
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...
template<class _T1, class _T2>
template<typename _Tp, typename... _Args>
inline _Tp
- pair<_T1, _T2>::
- __cons(tuple<_Args...>&& __tuple)
+ pair<_T1, _T2>::__cons(tuple<_Args...>&& __tuple)
{
typedef typename _Build_index_tuple<sizeof...(_Args)>::__type
_Indexes;
}
template<class _T1, class _T2>
- template<typename _Tp, typename... _Args, int... _Indexes>
+ template<typename _Tp, typename... _Args, std::size_t... _Indexes>
inline _Tp
- pair<_T1, _T2>::
- __do_cons(tuple<_Args...>&& __tuple,
- const _Index_tuple<_Indexes...>&)
+ pair<_T1, _T2>::__do_cons(tuple<_Args...>&& __tuple,
+ const _Index_tuple<_Indexes...>&)
{ return _Tp(std::forward<_Args>(get<_Indexes>(__tuple))...); }
_GLIBCXX_END_NAMESPACE_VERSION
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