1 // C++ 26 P2552R3 - On the ignorability of standard attributes
2 // { dg-do compile { target c++11 } }
5 struct S { int a, b; };
11 [[deprecated]] int x1;
12 [[deprecated ("foobar")]] int x2;
13 [[deprecated (0)]] int x3; // { dg-error "deprecated message is not a string" }
14 // { dg-error "expected string-literal before numeric constant" "" { target c++26 } .-1 }
15 [[deprecated ("foo", "bar", "baz")]] int x4; // { dg-error "wrong number of arguments specified for 'deprecated' attribute" }
16 [[deprecated (0, 1, 2)]] int x5; // { dg-error "wrong number of arguments specified for 'deprecated' attribute" }
17 // { dg-error "expected string-literal before numeric constant" "" { target c++26 } .-1 }
19 auto a = [] [[deprecated]] () {};
20 auto b = [] constexpr [[deprecated]] {}; // { dg-error "'deprecated' on a type other than class or enumeration definition" }
21 // { dg-error "parameter declaration before lambda declaration specifiers only optional with" "" { target c++20_down } .-1 }
22 // { dg-error "'constexpr' lambda only available with" "" { target c++14_down } .-2 }
23 auto c = [] noexcept [[deprecated]] {}; // { dg-error "'deprecated' on a type other than class or enumeration definition" }
24 // { dg-error "parameter declaration before lambda exception specification only optional with" "" { target c++20_down } .-1 }
25 auto d = [] () [[deprecated]] {}; // { dg-error "'deprecated' on a type other than class or enumeration definition" }
26 auto e = new int [n] [[deprecated]]; // { dg-warning "attributes ignored on outermost array type in new expression" }
27 auto e2 = new int [n] [[deprecated]] [42]; // { dg-warning "attributes ignored on outermost array type in new expression" }
28 auto f = new int [n][42] [[deprecated]]; // { dg-error "'deprecated' on a type other than class or enumeration definition" }
29 [[deprecated]]; // { dg-warning "attributes at the beginning of statement are ignored" }
30 [[deprecated]] {} // { dg-warning "attributes at the beginning of statement are ignored" }
31 [[deprecated]] if (true) {} // { dg-warning "attributes at the beginning of statement are ignored" }
32 [[deprecated]] while (false) {} // { dg-warning "attributes at the beginning of statement are ignored" }
33 [[deprecated]] goto lab; // { dg-warning "attributes at the beginning of statement are ignored" }
34 [[deprecated]] lab:; // { dg-error "'deprecated' attribute ignored" }
35 [[deprecated]] try {} catch (int) {} // { dg-warning "attributes at the beginning of statement are ignored" }
36 if ([[deprecated]] int x = 0) {}
39 [[deprecated]] case 1: // { dg-error "'deprecated' attribute ignored" }
40 [[deprecated]] break; // { dg-warning "attributes at the beginning of statement are ignored" }
41 [[deprecated]] default: // { dg-error "'deprecated' attribute ignored" }
44 for ([[deprecated]] auto a : arr) {}
45 for ([[deprecated]] auto [a, b] : arr2) {} // { dg-error "structured bindings only available with" "" { target c++14_down } }
46 [[deprecated]] asm (""); // { dg-warning "attributes ignored on 'asm' declaration" }
47 try {} catch ([[deprecated]] int x) {}
48 try {} catch ([[deprecated]] int) {}
49 try {} catch (int [[deprecated]] x) {} // { dg-warning "attribute ignored" }
50 try {} catch (int [[deprecated]]) {} // { dg-warning "attribute ignored" }
51 try {} catch (int x [[deprecated]]) {}
54 [[deprecated]] int bar ();
55 using foobar [[deprecated]] = int;
57 [[deprecated]] auto [b, c] = arr; // { dg-error "structured bindings only available with" "" { target c++14_down } }
58 [[deprecated]]; // { dg-warning "attribute ignored" }
59 inline [[deprecated]] void baz () {} // { dg-warning "attribute ignored" }
60 // { dg-error "standard attributes in middle of decl-specifiers" "" { target *-*-* } .-1 }
61 constexpr [[deprecated]] int qux () { return 0; } // { dg-warning "attribute ignored" }
62 // { dg-error "standard attributes in middle of decl-specifiers" "" { target *-*-* } .-1 }
63 int [[deprecated]] d; // { dg-warning "attribute ignored" }
64 int const [[deprecated]] e = 1; // { dg-warning "attribute ignored" }
65 struct A {} [[deprecated]]; // { dg-warning "attribute ignored in declaration of 'struct A'" }
66 struct A [[deprecated]]; // { dg-warning "attribute ignored" }
67 struct A [[deprecated]] a1; // { dg-warning "attribute ignored" }
68 A [[deprecated]] a2; // { dg-warning "attribute ignored" }
69 enum B { B0 } [[deprecated]]; // { dg-warning "attribute ignored in declaration of 'enum B'" }
70 enum B [[deprecated]]; // { dg-warning "attribute ignored" }
71 enum B [[deprecated]] b1; // { dg-warning "attribute ignored" }
72 B [[deprecated]] b2; // { dg-warning "attribute ignored" }
73 struct [[deprecated]] C {};
75 int g[2] [[deprecated]]; // { dg-error "'deprecated' on a type other than class or enumeration definition" }
76 int g2 [[deprecated]] [2];
77 int corge () [[deprecated]]; // { dg-error "'deprecated' on a type other than class or enumeration definition" }
78 int *[[deprecated]] h; // { dg-error "'deprecated' on a type other than class or enumeration definition" }
79 int & [[deprecated]] i = f; // { dg-error "'deprecated' on a type other than class or enumeration definition" }
80 // { dg-warning "'f' is deprecated" "" { target *-*-* } .-1 }
81 int && [[deprecated]] j = 0; // { dg-error "'deprecated' on a type other than class or enumeration definition" }
82 int S::* [[deprecated]] k; // { dg-error "'deprecated' on a type other than class or enumeration definition" }
83 auto l = sizeof (int [2] [[deprecated]]); // { dg-error "'deprecated' on a type other than class or enumeration definition" }
84 int freddy ([[deprecated]] int a,
86 [[deprecated]] int c = 0,
87 [[deprecated]] int = 0);
89 corge ([[deprecated]] int a,
91 [[deprecated]] int c = 0,
92 [[deprecated]] int = 0)
99 int grault (int [[deprecated]] a, // { dg-warning "attribute ignored" }
100 int [[deprecated]], // { dg-warning "attribute ignored" }
101 int [[deprecated]] c = 0, // { dg-warning "attribute ignored" }
102 int [[deprecated]] = 0); // { dg-warning "attribute ignored" }
104 waldo (int [[deprecated]] a, // { dg-warning "attribute ignored" }
105 int [[deprecated]], // { dg-warning "attribute ignored" }
106 int [[deprecated]] c = 0, // { dg-warning "attribute ignored" }
107 int [[deprecated]] = 0) // { dg-warning "attribute ignored" }
110 int plugh (int a [[deprecated]],
111 int b [[deprecated]] = 0);
113 thud (int a [[deprecated]],
114 int b [[deprecated]] = 0)
117 enum [[deprecated]] D { D0 };
118 enum class [[deprecated]] E { E0 };
120 enum [[deprecated]] F; // { dg-warning "type attributes ignored after type is already defined" }
123 G1 [[deprecated]] = 2
125 namespace [[deprecated]] H { using H0 = int; }
126 namespace [[deprecated]] {} // { dg-warning "ignoring 'deprecated' attribute on anonymous namespace" }
127 [[deprecated]] using namespace H; // { dg-warning "'deprecated' attribute directive ignored" }
128 // { dg-warning "'H' is deprecated" "" { target *-*-* } .-1 }
129 struct [[deprecated]] I
131 [[deprecated]]; // { dg-error "declaration does not declare anything" }
132 [[deprecated]] int i;
133 [[deprecated]] int foo ();
134 [[deprecated]] int bar () { return 1; }
135 [[deprecated]] int : 0; // { dg-error "'deprecated' on unnamed bit-field" }
136 [[deprecated]] int i2 : 5;
137 [[deprecated]] static int i3;
140 [[deprecated]] int I::i4 = 0;
141 struct J : [[deprecated]] C {}; // { dg-warning "attributes on base specifiers are ignored" }
142 #if __cpp_concepts >= 201907L
143 template <typename T>
144 concept K [[deprecated]] = requires { true; };
146 typedef int L [[deprecated]];
147 template <typename T>
150 struct [[deprecated]] M<int> { int m; };
151 typedef int N[2] [[deprecated]]; // { dg-error "'deprecated' on a type other than class or enumeration definition" }
152 typedef int O [[deprecated]] [2];