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
7 // { dg-options "-std=c++0x" }
9 template <bool> struct sa;
10 template <> struct sa<true> {};
12 template <class T, T v>
13 struct integral_constant
15 static const T value = v;
17 typedef integral_constant<T, v> type;
20 typedef integral_constant<bool, true> true_type;
21 typedef integral_constant<bool, false> false_type;
23 template <class T> struct is_lvalue_reference : public integral_constant<bool, false> {};
24 template <class T> struct is_lvalue_reference<T&> : public integral_constant<bool, true> {};
26 template <class T> struct is_rvalue_reference : public integral_constant<bool, false> {};
27 template <class T> struct is_rvalue_reference<T&&> : public integral_constant<bool, true> {};
29 template <class T> struct remove_reference {typedef T type;};
30 template <class T> struct remove_reference<T&> {typedef T type;};
31 template <class T> struct remove_reference<T&&> {typedef T type;};
33 template <class T> struct is_const : public integral_constant<bool, false> {};
34 template <class T> struct is_const<T const> : public integral_constant<bool, true> {};
36 template <class T> struct is_volatile : public integral_constant<bool, false> {};
37 template <class T> struct is_volatile<T volatile> : public integral_constant<bool, true> {};
42 typedef const A& cAlref;
43 typedef volatile A& vAlref;
44 typedef const volatile A& cvAlref;
47 typedef const A&& cArref;
48 typedef volatile A&& vArref;
49 typedef const volatile A&& cvArref;
51 template <class T, bool is_lvalue_ref, bool is_rvalue_ref, bool s_const, bool s_volatile>
54 sa<is_lvalue_reference<T>::value == is_lvalue_ref> t1;
55 sa<is_rvalue_reference<T>::value == is_rvalue_ref> t2;
56 sa<is_const <typename remove_reference<T>::type>::value == s_const> t3;
57 sa<is_volatile<typename remove_reference<T>::type>::value == s_volatile> t4;
58 sa<is_const <typename remove_reference<const T>::type>::value == s_const > t5;
59 sa<is_volatile<typename remove_reference< volatile T>::type>::value == s_volatile> t6;
65 test< A&, true, false, false, false>();
66 test<const A&, true, false, true, false>();
67 test< volatile A&, true, false, false, true>();
68 test<const volatile A&, true, false, true, true>();
69 test< A&&, false, true, false, false>();
70 test<const A&&, false, true, true, false>();
71 test< volatile A&&, false, true, false, true>();
72 test<const volatile A&&, false, true, true, true>();
74 // lvalue reference test
77 test< Alref&, true, false, false, false>();
78 test<const Alref&, true, false, false, false>();
79 test< volatile Alref&, true, false, false, false>();
80 test<const volatile Alref&, true, false, false, false>();
83 test< cAlref&, true, false, true, false>();
84 test<const cAlref&, true, false, true, false>();
85 test< volatile cAlref&, true, false, true, false>();
86 test<const volatile cAlref&, true, false, true, false>();
89 test< vAlref&, true, false, false, true>();
90 test<const vAlref&, true, false, false, true>();
91 test< volatile vAlref&, true, false, false, true>();
92 test<const volatile vAlref&, true, false, false, true>();
95 test< cvAlref&, true, false, true, true>();
96 test<const cvAlref&, true, false, true, true>();
97 test< volatile cvAlref&, true, false, true, true>();
98 test<const volatile cvAlref&, true, false, true, true>();
101 test< Arref&, true, false, false, false>();
102 test<const Arref&, true, false, false, false>();
103 test< volatile Arref&, true, false, false, false>();
104 test<const volatile Arref&, true, false, false, false>();
107 test< cArref&, true, false, true, false>();
108 test<const cArref&, true, false, true, false>();
109 test< volatile cArref&, true, false, true, false>();
110 test<const volatile cArref&, true, false, true, false>();
113 test< vArref&, true, false, false, true>();
114 test<const vArref&, true, false, false, true>();
115 test< volatile vArref&, true, false, false, true>();
116 test<const volatile vArref&, true, false, false, true>();
119 test< cvArref&, true, false, true, true>();
120 test<const cvArref&, true, false, true, true>();
121 test< volatile cvArref&, true, false, true, true>();
122 test<const volatile cvArref&, true, false, true, true>();
124 // rvalue reference test
127 test< Alref&&, true, false, false, false>();
128 test<const Alref&&, true, false, false, false>();
129 test< volatile Alref&&, true, false, false, false>();
130 test<const volatile Alref&&, true, false, false, false>();
133 test< cAlref&&, true, false, true, false>();
134 test<const cAlref&&, true, false, true, false>();
135 test< volatile cAlref&&, true, false, true, false>();
136 test<const volatile cAlref&&, true, false, true, false>();
139 test< vAlref&&, true, false, false, true>();
140 test<const vAlref&&, true, false, false, true>();
141 test< volatile vAlref&&, true, false, false, true>();
142 test<const volatile vAlref&&, true, false, false, true>();
145 test< cvAlref&&, true, false, true, true>();
146 test<const cvAlref&&, true, false, true, true>();
147 test< volatile cvAlref&&, true, false, true, true>();
148 test<const volatile cvAlref&&, true, false, true, true>();
151 test< Arref&&, false, true, false, false>();
152 test<const Arref&&, false, true, false, false>();
153 test< volatile Arref&&, false, true, false, false>();
154 test<const volatile Arref&&, false, true, false, false>();
157 test< cArref&&, false, true, true, false>();
158 test<const cArref&&, false, true, true, false>();
159 test< volatile cArref&&, false, true, true, false>();
160 test<const volatile cArref&&, false, true, true, false>();
163 test< vArref&&, false, true, false, true>();
164 test<const vArref&&, false, true, false, true>();
165 test< volatile vArref&&, false, true, false, true>();
166 test<const volatile vArref&&, false, true, false, true>();
169 test< cvArref&&, false, true, true, true>();
170 test<const cvArref&&, false, true, true, true>();
171 test< volatile cvArref&&, false, true, true, true>();
172 test<const volatile cvArref&&, false, true, true, true>();