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comparison gcc/testsuite/g++.dg/cpp1y/constexpr-empty4.C @ 131:84e7813d76e9

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gcc-8.2
author mir3636
date Thu, 25 Oct 2018 07:37:49 +0900
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111:04ced10e8804 131:84e7813d76e9
1 // PR c++/81933
2 // { dg-do compile { target c++14 } }
3
4 namespace std {
5 template <typename _Tp> struct __decay_and_strip { typedef _Tp __type; };
6 template <int> struct enable_if { typedef int type; };
7 template <typename _Head> struct _Head_base {
8 constexpr _Head_base(_Head) {}
9 };
10 template <unsigned long, typename...> struct _Tuple_impl;
11 template <unsigned long _Idx, typename _Head, typename... _Tail>
12 struct _Tuple_impl<_Idx, _Head, _Tail...> : _Tuple_impl<1, _Tail...>, // { dg-warning "direct base" }
13 _Head_base<_Head> {
14 typedef _Tuple_impl<1, _Tail...> _Inherited;
15 typedef _Head_base<_Head> _Base;
16 constexpr _Tuple_impl(_Head __head, _Tail... __tail)
17 : _Inherited(__tail...), _Base(__head) {}
18 _Tuple_impl(const _Tuple_impl &) = default;
19 _Tuple_impl(_Tuple_impl &&);
20 };
21 template <unsigned long _Idx, typename _Head>
22 struct _Tuple_impl<_Idx, _Head> : _Head_base<_Head> {
23 typedef _Head_base<_Head> _Base;
24 constexpr _Tuple_impl(_Head __head) : _Base(__head) {}
25 };
26 template <int> struct _TC {
27 static constexpr bool _NotSameTuple() { return true; }
28 };
29 template <typename... _Elements> class tuple : _Tuple_impl<0, _Elements...> {
30 typedef _Tuple_impl<0, _Elements...> _Inherited;
31
32 public:
33 template <typename... _UElements,
34 enable_if<_TC<1>::_NotSameTuple()>::type = false>
35 constexpr tuple(_UElements... __elements) : _Inherited(__elements...) {}
36 tuple(const tuple &) = default;
37 };
38 template <typename... _Elements>
39 constexpr tuple<typename __decay_and_strip<_Elements>::__type...>
40 make_tuple(_Elements... __args) {
41 typedef tuple<typename __decay_and_strip<_Elements>::__type...> __result_type;
42 return __result_type(__args...);
43 }
44 }
45 struct any_udt {};
46 template <typename... Tuples> constexpr auto flatten(Tuples... tuples) {
47 auto all = std::make_tuple(tuples...);
48 auto flat(all);
49 return flat;
50 }
51 constexpr auto fail = flatten(any_udt{}, any_udt{});