1 // I, Howard Hinnant, hereby place this code in the public domain.
3 // Test the reference collapsing rules. Note that there are recent differences
4 // for how cv-qualifications are applied to reference types. 7.1.3, 14.3.1
6 // { dg-do compile { target c++11 } }
8 template <bool> struct sa;
9 template <> struct sa<true> {};
11 template <class T, T v>
12 struct integral_constant
14 static const T value = v;
16 typedef integral_constant<T, v> type;
19 typedef integral_constant<bool, true> true_type;
20 typedef integral_constant<bool, false> false_type;
22 template <class T> struct is_lvalue_reference : public integral_constant<bool, false> {};
23 template <class T> struct is_lvalue_reference<T&> : public integral_constant<bool, true> {};
25 template <class T> struct is_rvalue_reference : public integral_constant<bool, false> {};
26 template <class T> struct is_rvalue_reference<T&&> : public integral_constant<bool, true> {};
28 template <class T> struct remove_reference {typedef T type;};
29 template <class T> struct remove_reference<T&> {typedef T type;};
30 template <class T> struct remove_reference<T&&> {typedef T type;};
32 template <class T> struct is_const : public integral_constant<bool, false> {};
33 template <class T> struct is_const<T const> : public integral_constant<bool, true> {};
35 template <class T> struct is_volatile : public integral_constant<bool, false> {};
36 template <class T> struct is_volatile<T volatile> : public integral_constant<bool, true> {};
41 typedef const A& cAlref;
42 typedef volatile A& vAlref;
43 typedef const volatile A& cvAlref;
46 typedef const A&& cArref;
47 typedef volatile A&& vArref;
48 typedef const volatile A&& cvArref;
50 template <class T, bool is_lvalue_ref, bool is_rvalue_ref, bool s_const, bool s_volatile>
53 sa<is_lvalue_reference<T>::value == is_lvalue_ref> t1;
54 sa<is_rvalue_reference<T>::value == is_rvalue_ref> t2;
55 sa<is_const <typename remove_reference<T>::type>::value == s_const> t3;
56 sa<is_volatile<typename remove_reference<T>::type>::value == s_volatile> t4;
57 sa<is_const <typename remove_reference<const T>::type>::value == s_const > t5;
58 sa<is_volatile<typename remove_reference< volatile T>::type>::value == s_volatile> t6;
64 test< A&, true, false, false, false>();
65 test<const A&, true, false, true, false>();
66 test< volatile A&, true, false, false, true>();
67 test<const volatile A&, true, false, true, true>();
68 test< A&&, false, true, false, false>();
69 test<const A&&, false, true, true, false>();
70 test< volatile A&&, false, true, false, true>();
71 test<const volatile A&&, false, true, true, true>();
73 // lvalue reference test
76 test< Alref&, true, false, false, false>();
77 test<const Alref&, true, false, false, false>();
78 test< volatile Alref&, true, false, false, false>();
79 test<const volatile Alref&, true, false, false, false>();
82 test< cAlref&, true, false, true, false>();
83 test<const cAlref&, true, false, true, false>();
84 test< volatile cAlref&, true, false, true, false>();
85 test<const volatile cAlref&, true, false, true, false>();
88 test< vAlref&, true, false, false, true>();
89 test<const vAlref&, true, false, false, true>();
90 test< volatile vAlref&, true, false, false, true>();
91 test<const volatile vAlref&, true, false, false, true>();
94 test< cvAlref&, true, false, true, true>();
95 test<const cvAlref&, true, false, true, true>();
96 test< volatile cvAlref&, true, false, true, true>();
97 test<const volatile cvAlref&, true, false, true, true>();
100 test< Arref&, true, false, false, false>();
101 test<const Arref&, true, false, false, false>();
102 test< volatile Arref&, true, false, false, false>();
103 test<const volatile Arref&, true, false, false, false>();
106 test< cArref&, true, false, true, false>();
107 test<const cArref&, true, false, true, false>();
108 test< volatile cArref&, true, false, true, false>();
109 test<const volatile cArref&, true, false, true, false>();
112 test< vArref&, true, false, false, true>();
113 test<const vArref&, true, false, false, true>();
114 test< volatile vArref&, true, false, false, true>();
115 test<const volatile vArref&, true, false, false, true>();
118 test< cvArref&, true, false, true, true>();
119 test<const cvArref&, true, false, true, true>();
120 test< volatile cvArref&, true, false, true, true>();
121 test<const volatile cvArref&, true, false, true, true>();
123 // rvalue reference test
126 test< Alref&&, true, false, false, false>();
127 test<const Alref&&, true, false, false, false>();
128 test< volatile Alref&&, true, false, false, false>();
129 test<const volatile Alref&&, true, false, false, false>();
132 test< cAlref&&, true, false, true, false>();
133 test<const cAlref&&, true, false, true, false>();
134 test< volatile cAlref&&, true, false, true, false>();
135 test<const volatile cAlref&&, true, false, true, false>();
138 test< vAlref&&, true, false, false, true>();
139 test<const vAlref&&, true, false, false, true>();
140 test< volatile vAlref&&, true, false, false, true>();
141 test<const volatile vAlref&&, true, false, false, true>();
144 test< cvAlref&&, true, false, true, true>();
145 test<const cvAlref&&, true, false, true, true>();
146 test< volatile cvAlref&&, true, false, true, true>();
147 test<const volatile cvAlref&&, true, false, true, true>();
150 test< Arref&&, false, true, false, false>();
151 test<const Arref&&, false, true, false, false>();
152 test< volatile Arref&&, false, true, false, false>();
153 test<const volatile Arref&&, false, true, false, false>();
156 test< cArref&&, false, true, true, false>();
157 test<const cArref&&, false, true, true, false>();
158 test< volatile cArref&&, false, true, true, false>();
159 test<const volatile cArref&&, false, true, true, false>();
162 test< vArref&&, false, true, false, true>();
163 test<const vArref&&, false, true, false, true>();
164 test< volatile vArref&&, false, true, false, true>();
165 test<const volatile vArref&&, false, true, false, true>();
168 test< cvArref&&, false, true, true, true>();
169 test<const cvArref&&, false, true, true, true>();
170 test< volatile cvArref&&, false, true, true, true>();
171 test<const volatile cvArref&&, false, true, true, true>();