1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
// RUN: %clang_cc1 -std=c++98 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++11 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++14 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++17 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++20 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++23 %s -verify -fexceptions -fcxx-exceptions -pedantic-errors
// dr1200: na
namespace dr1213 { // dr1213: 7
#if __cplusplus >= 201103L
using T = int[3];
int &&r = T{}[1];
using T = decltype((T{}));
using U = decltype((T{}[2]));
using U = int &&;
// Same thing but in a case where we consider overloaded operator[].
struct ConvertsToInt {
operator int();
};
struct X { int array[1]; };
using U = decltype(X().array[ConvertsToInt()]);
// We apply the same rule to vector subscripting.
typedef int V4Int __attribute__((__vector_size__(sizeof(int) * 4)));
typedef int EV4Int __attribute__((__ext_vector_type__(4)));
using U = decltype(V4Int()[0]);
using U = decltype(EV4Int()[0]);
#endif
}
#if __cplusplus >= 201103L
namespace dr1223 { // dr1227: yes open
struct M;
template <typename T>
struct V;
struct S {
S* operator()();
int N;
int M;
#if __cplusplus > 202002L
template <typename T>
static constexpr auto V = 0;
void f(char);
void f(int);
void mem(S s) {
auto(s)()->M; //expected-warning {{expression result unused}}
auto(s)()->V<int>; //expected-warning {{expression result unused}}
auto(s)()->f(0);
}
#endif
};
void f(S s) {
{
#if __cplusplus > 202002L
auto(s)()->N; //expected-warning {{expression result unused}}
#endif
auto(s)()->M;
}
{
S(s)()->N; //expected-warning {{expression result unused}}
S(s)()->M; //expected-warning {{expression result unused}}
}
}
struct A {
A(int*);
A *operator()();
};
typedef struct BB { int C[2]; } *B, C;
void g() {
A a(B ()->C);
A b(auto ()->C);
static_assert(sizeof(B ()->C[1] == sizeof(int)), "");
sizeof(auto () -> C[1]); // expected-error{{function cannot return array type 'C[1]'}}
}
}
#endif
#if __cplusplus >= 201103L
namespace dr1227 { // dr1227: yes
template <class T> struct A { using X = typename T::X; }; // expected-error {{type 'int' cannot be used prior to '::' because it has no members}}
template <class T> typename T::X f(typename A<T>::X);
template <class T> void f(...) { }
template <class T> auto g(typename A<T>::X) -> typename T::X; // expected-note {{in instantiation of template class 'dr1227::A<int>' requested here}}
template <class T> void g(...) { }
void h() {
f<int>(0); // OK, substituting return type causes deduction to fail
g<int>(0); // expected-note {{while substituting explicitly-specified template arguments into function template 'g'}}
}
}
#endif
namespace dr1250 { // dr1250: 3.9
struct Incomplete;
struct Base {
virtual const Incomplete *meow() = 0;
};
struct Derived : Base {
virtual Incomplete *meow();
};
}
namespace dr1265 { // dr1265: 5
#if __cplusplus >= 201103L
auto a = 0, b() -> int; // expected-error {{declaration with trailing return type must be the only declaration in its group}}
auto b() -> int, d = 0; // expected-error {{declaration with trailing return type must be the only declaration in its group}}
auto e() -> int, f() -> int; // expected-error {{declaration with trailing return type must be the only declaration in its group}}
#endif
#if __cplusplus >= 201402L
auto g(), h = 0; // expected-error {{function with deduced return type must be the only declaration in its group}}
auto i = 0, j(); // expected-error {{function with deduced return type must be the only declaration in its group}}
auto k(), l(); // expected-error {{function with deduced return type must be the only declaration in its group}}
#endif
}
// dr1291: na
namespace dr1295 { // dr1295: 4
struct X {
unsigned bitfield : 4;
};
X x = {1};
unsigned const &r1 = static_cast<X &&>(x).bitfield; // expected-error 0-1{{C++11}}
unsigned const &r2 = static_cast<unsigned &&>(x.bitfield); // expected-error 0-1{{C++11}}
template<unsigned &r> struct Y {};
Y<x.bitfield> y;
#if __cplusplus <= 201402L
// expected-error@-2 {{does not refer to any declaration}} expected-note@-3 {{here}}
#else
// expected-error@-4 {{refers to subobject}}
#endif
#if __cplusplus >= 201103L
const unsigned other = 0;
using T = decltype(true ? other : x.bitfield);
using T = unsigned;
#endif
}
|
