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Implement the <tuple> part of C++20 p1032 Misc constexpr bits.
- From: "Smith-Rowland, Edward M" <ESmith-rowland at alionscience dot com>
- To: "libstdc++ at gcc dot gnu dot org" <libstdc++ at gcc dot gnu dot org>, "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>, "jwakely at redhat dot com" <jwakely at redhat dot com>
- Cc: "Ed Smith-Rowland (3dw4rd at verizon dot net)" <3dw4rd at verizon dot net>
- Date: Sat, 9 Nov 2019 02:07:43 +0000
- Subject: Implement the <tuple> part of C++20 p1032 Misc constexpr bits.
Here is the <tuple> part of C++20 p1032 Misc constexpr bits.
Tested on x86_64-linux. OK?
Ed
2019-11-09 Edward Smith-Rowland <3dw4rd@verizon.net>
Implement the <tuple> part of C++20 p1032 Misc constexpr bits.
* include/std/tuple (_Head_base, _Tuple_impl(allocator_arg_t,...),
_M_assign, tuple(allocator_arg_t,...), _Inherited, operator=, _M_swap,
swap, pair(piecewise_construct_t,): Constexpr.
* (__uses_alloc0::_Sink::operator=, __uses_alloc_t): Constexpr.
* testsuite/20_util/tuple/cons/constexpr_allocator_arg_t.cc: New test.
Index: include/std/tuple
===================================================================
--- include/std/tuple (revision 277944)
+++ include/std/tuple (working copy)
@@ -132,6 +132,7 @@
constexpr _Head_base(_UHead&& __h)
: _M_head_impl(std::forward<_UHead>(__h)) { }
+ _GLIBCXX20_CONSTEXPR
_Head_base(allocator_arg_t, __uses_alloc0)
: _M_head_impl() { }
@@ -144,6 +145,7 @@
: _M_head_impl(*__a._M_a) { }
template<typename _UHead>
+ _GLIBCXX20_CONSTEXPR
_Head_base(__uses_alloc0, _UHead&& __uhead)
: _M_head_impl(std::forward<_UHead>(__uhead)) { }
@@ -243,6 +245,7 @@
(_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)) { }
@@ -256,6 +259,7 @@
template<typename _Alloc, typename _UHead, typename... _UTail,
typename = typename enable_if<sizeof...(_Tail)
== sizeof...(_UTail)>::type>
+ _GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
_UHead&& __head, _UTail&&... __tail)
: _Inherited(__tag, __a, std::forward<_UTail>(__tail)...),
@@ -263,6 +267,7 @@
std::forward<_UHead>(__head)) { }
template<typename _Alloc>
+ _GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
const _Tuple_impl& __in)
: _Inherited(__tag, __a, _M_tail(__in)),
@@ -269,6 +274,7 @@
_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)
: _Inherited(__tag, __a, std::move(_M_tail(__in))),
@@ -276,6 +282,7 @@
std::forward<_Head>(_M_head(__in))) { }
template<typename _Alloc, typename... _UElements>
+ _GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
const _Tuple_impl<_Idx, _UElements...>& __in)
: _Inherited(__tag, __a,
@@ -284,6 +291,7 @@
_Tuple_impl<_Idx, _UElements...>::_M_head(__in)) { }
template<typename _Alloc, typename _UHead, typename... _UTails>
+ _GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
_Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
: _Inherited(__tag, __a, std::move
@@ -293,6 +301,7 @@
(_Tuple_impl<_Idx, _UHead, _UTails...>::_M_head(__in))) { }
template<typename... _UElements>
+ _GLIBCXX20_CONSTEXPR
void
_M_assign(const _Tuple_impl<_Idx, _UElements...>& __in)
{
@@ -302,6 +311,7 @@
}
template<typename _UHead, typename... _UTails>
+ _GLIBCXX20_CONSTEXPR
void
_M_assign(_Tuple_impl<_Idx, _UHead, _UTails...>&& __in)
{
@@ -312,6 +322,7 @@
}
protected:
+ _GLIBCXX20_CONSTEXPR
void
_M_swap(_Tuple_impl& __in)
{
@@ -369,6 +380,7 @@
{ }
template<typename _Alloc>
+ _GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a)
: _Base(__tag, __use_alloc<_Head>(__a)) { }
@@ -378,6 +390,7 @@
: _Base(__use_alloc<_Head, _Alloc, _Head>(__a), __head) { }
template<typename _Alloc, typename _UHead>
+ _GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
_UHead&& __head)
: _Base(__use_alloc<_Head, _Alloc, _UHead>(__a),
@@ -384,11 +397,13 @@
std::forward<_UHead>(__head)) { }
template<typename _Alloc>
+ _GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
const _Tuple_impl& __in)
: _Base(__use_alloc<_Head, _Alloc, _Head>(__a), _M_head(__in)) { }
template<typename _Alloc>
+ _GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
_Tuple_impl&& __in)
: _Base(__use_alloc<_Head, _Alloc, _Head>(__a),
@@ -395,6 +410,7 @@
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),
@@ -401,6 +417,7 @@
_Tuple_impl<_Idx, _UHead>::_M_head(__in)) { }
template<typename _Alloc, typename _UHead>
+ _GLIBCXX20_CONSTEXPR
_Tuple_impl(allocator_arg_t __tag, const _Alloc& __a,
_Tuple_impl<_Idx, _UHead>&& __in)
: _Base(__use_alloc<_Head, _Alloc, _UHead>(__a),
@@ -408,6 +425,7 @@
{ }
template<typename _UHead>
+ _GLIBCXX20_CONSTEXPR
void
_M_assign(const _Tuple_impl<_Idx, _UHead>& __in)
{
@@ -415,6 +433,7 @@
}
template<typename _UHead>
+ _GLIBCXX20_CONSTEXPR
void
_M_assign(_Tuple_impl<_Idx, _UHead>&& __in)
{
@@ -423,6 +442,7 @@
}
protected:
+ _GLIBCXX20_CONSTEXPR
void
_M_swap(_Tuple_impl& __in)
{
@@ -680,11 +700,13 @@
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, 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...) { }
@@ -691,6 +713,7 @@
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)
@@ -699,6 +722,7 @@
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)...)
@@ -707,6 +731,7 @@
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)
@@ -714,10 +739,12 @@
{ }
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)) { }
@@ -725,6 +752,7 @@
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,
@@ -735,6 +763,7 @@
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)
@@ -746,6 +775,7 @@
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,
@@ -756,6 +786,7 @@
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)
@@ -765,6 +796,7 @@
// tuple assignment
+ _GLIBCXX20_CONSTEXPR
tuple&
operator=(typename conditional<__assignable<const _Elements&...>(),
const tuple&,
@@ -775,6 +807,7 @@
return *this;
}
+ _GLIBCXX20_CONSTEXPR
tuple&
operator=(typename conditional<__assignable<_Elements...>(),
tuple&&,
@@ -786,6 +819,7 @@
}
template<typename... _UElements>
+ _GLIBCXX20_CONSTEXPR
__enable_if_t<__assignable<const _UElements&...>(), tuple&>
operator=(const tuple<_UElements...>& __in)
noexcept(__nothrow_assignable<const _UElements&...>())
@@ -795,6 +829,7 @@
}
template<typename... _UElements>
+ _GLIBCXX20_CONSTEXPR
__enable_if_t<__assignable<_UElements...>(), tuple&>
operator=(tuple<_UElements...>&& __in)
noexcept(__nothrow_assignable<_UElements...>())
@@ -804,6 +839,7 @@
}
// tuple swap
+ _GLIBCXX20_CONSTEXPR
void
swap(tuple& __in)
noexcept(__and_<__is_nothrow_swappable<_Elements>...>::value)
@@ -834,8 +870,10 @@
tuple() = default;
// No-op allocator constructors.
template<typename _Alloc>
+ _GLIBCXX20_CONSTEXPR
tuple(allocator_arg_t, const _Alloc&) noexcept { }
template<typename _Alloc>
+ _GLIBCXX20_CONSTEXPR
tuple(allocator_arg_t, const _Alloc&, const tuple&) noexcept { }
};
@@ -1015,11 +1053,13 @@
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, 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) { }
@@ -1027,6 +1067,7 @@
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) { }
@@ -1033,6 +1074,7 @@
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)) { }
@@ -1040,6 +1082,7 @@
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),
@@ -1046,15 +1089,18 @@
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,
_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,
@@ -1064,6 +1110,7 @@
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,
@@ -1072,6 +1119,7 @@
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))
{ }
@@ -1079,6 +1127,7 @@
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))
{ }
@@ -1085,6 +1134,7 @@
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) { }
@@ -1092,6 +1142,7 @@
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) { }
@@ -1098,6 +1149,7 @@
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)) { }
@@ -1105,10 +1157,14 @@
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=(typename conditional<__assignable<const _T1&, const _T2&>(),
const tuple&,
@@ -1119,6 +1175,7 @@
return *this;
}
+ _GLIBCXX20_CONSTEXPR
tuple&
operator=(typename conditional<__assignable<_T1, _T2>(),
tuple&&,
@@ -1130,6 +1187,7 @@
}
template<typename _U1, typename _U2>
+ _GLIBCXX20_CONSTEXPR
__enable_if_t<__assignable<const _U1&, const _U2&>(), tuple&>
operator=(const tuple<_U1, _U2>& __in)
noexcept(__nothrow_assignable<const _U1&, const _U2&>())
@@ -1139,6 +1197,7 @@
}
template<typename _U1, typename _U2>
+ _GLIBCXX20_CONSTEXPR
__enable_if_t<__assignable<_U1, _U2>(), tuple&>
operator=(tuple<_U1, _U2>&& __in)
noexcept(__nothrow_assignable<_U1, _U2>())
@@ -1148,6 +1207,7 @@
}
template<typename _U1, typename _U2>
+ _GLIBCXX20_CONSTEXPR
__enable_if_t<__assignable<const _U1&, const _U2&>(), tuple&>
operator=(const pair<_U1, _U2>& __in)
noexcept(__nothrow_assignable<const _U1&, const _U2&>())
@@ -1158,6 +1218,7 @@
}
template<typename _U1, typename _U2>
+ _GLIBCXX20_CONSTEXPR
__enable_if_t<__assignable<_U1, _U2>(), tuple&>
operator=(pair<_U1, _U2>&& __in)
noexcept(__nothrow_assignable<_U1, _U2>())
@@ -1167,6 +1228,7 @@
return *this;
}
+ _GLIBCXX20_CONSTEXPR
void
swap(tuple& __in)
noexcept(__and_<__is_nothrow_swappable<_T1>,
@@ -1521,6 +1583,7 @@
/// swap
template<typename... _Elements>
+ _GLIBCXX20_CONSTEXPR
inline
#if __cplusplus > 201402L || !defined(__STRICT_ANSI__) // c++1z or gnu++11
// Constrained free swap overload, see p0185r1
@@ -1535,6 +1598,7 @@
#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
@@ -1570,7 +1634,8 @@
*/
template<class _T1, class _T2>
template<typename... _Args1, typename... _Args2>
- _GLIBCXX20_CONSTEXPR inline
+ _GLIBCXX20_CONSTEXPR
+ inline
pair<_T1, _T2>::
pair(piecewise_construct_t,
tuple<_Args1...> __first, tuple<_Args2...> __second)
Index: include/bits/uses_allocator.h
===================================================================
--- include/bits/uses_allocator.h (revision 277944)
+++ include/bits/uses_allocator.h (working copy)
@@ -72,7 +72,7 @@
struct __uses_alloc0 : __uses_alloc_base
{
- struct _Sink { void operator=(const void*) { } } _M_a;
+ struct _Sink { void _GLIBCXX20_CONSTEXPR operator=(const void*) { } } _M_a;
};
template<typename _Alloc>
@@ -109,6 +109,7 @@
__uses_alloc<uses_allocator<_Tp, _Alloc>::value, _Tp, _Alloc, _Args...>;
template<typename _Tp, typename _Alloc, typename... _Args>
+ _GLIBCXX20_CONSTEXPR
inline __uses_alloc_t<_Tp, _Alloc, _Args...>
__use_alloc(const _Alloc& __a)
{
Index: testsuite/20_util/tuple/cons/constexpr_allocator_arg_t.cc
===================================================================
--- testsuite/20_util/tuple/cons/constexpr_allocator_arg_t.cc (nonexistent)
+++ testsuite/20_util/tuple/cons/constexpr_allocator_arg_t.cc (working copy)
@@ -0,0 +1,48 @@
+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+//
+// Copyright (C) 2019 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
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <memory>
+#include <tuple>
+
+const std::allocator<int> alloc{};
+
+constexpr bool
+test_tuple()
+{
+ auto ok = true;
+
+ std::tuple<int, double, double> ta(std::allocator_arg, alloc);
+ std::tuple<int, double, double> tb(std::allocator_arg, alloc, 0, 3.456, 6.789);
+ std::tuple<int, double, double> tc(std::allocator_arg, alloc, 0, 3.456f, 6.789f);
+ std::tuple<int, double, double> td(std::allocator_arg, alloc, tb);
+ std::tuple<int, double, double> te(std::allocator_arg, alloc, std::move(tb));
+
+ std::tuple<int, float, float> tf(std::allocator_arg, alloc, 0, 3.456f, 6.789f);
+ std::tuple<int, double, double> tg(std::allocator_arg, alloc, tf);
+ std::tuple<int, double, double> th(std::allocator_arg, alloc, std::move(tf));
+
+ std::pair<int, float> pf(12, 3.142f);
+ std::tuple<int, double> ti(std::allocator_arg, alloc, pf);
+ std::tuple<int, double> tj(std::allocator_arg, alloc, std::move(pf));
+
+ return ok;
+}
+
+static_assert(test_tuple());