1 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
2
3 // The nested-name-specifier of a qualified declarator-id shall not begin with a decltype-specifier.
4 class foo {
5 static int i;
6 void func();
7 };
8
9 int decltype(foo())::i; // expected-error{{'decltype' cannot be used to name a declaration}}
foo()10 void decltype(foo())::func() { // expected-error{{'decltype' cannot be used to name a declaration}}
11 }
12
13
14 template<typename T>
15 class tfoo {
16 static int i;
17 void func();
18 };
19
20 template<typename T>
21 int decltype(tfoo<T>())::i; // expected-error{{nested name specifier 'decltype(tfoo<T>())::' for declaration does not refer into a class, class template or class template partial specialization}}
22 template<typename T>
func()23 void decltype(tfoo<T>())::func() { // expected-error{{nested name specifier 'decltype(tfoo<T>())::' for declaration does not refer into a class, class template or class template partial specialization}}
24 }
25
26 // An init-declarator named with a qualified-id can refer to an element of the
27 // inline namespace set of the named namespace.
28 namespace inline_namespaces {
29 namespace N {
30 inline namespace M {
31 void f(); // expected-note {{possible target}}
32 void g();
33 extern int m; // expected-note {{candidate}}
34 extern int n;
35 struct S; // expected-note {{candidate}}
36 struct T;
37 enum E : int; // expected-note {{candidate}}
38 enum F : int;
39 template<typename T> void ft(); // expected-note {{here}}
40 template<typename T> void gt(); // expected-note {{here}}
41 template<typename T> extern int mt; // expected-note {{here}} expected-warning {{extension}}
42 template<typename T> extern int nt; // expected-note {{here}} expected-warning {{extension}}
43 template<typename T> struct U; // expected-note {{here}}
44 template<typename T> struct V; // expected-note {{here}}
45 }
46
47 // When named by unqualified-id, we do *not* look in the inline namespace
48 // set.
f()49 void f() {} // expected-note {{possible target}}
50 int m; // expected-note {{candidate}}
51 struct S {}; // expected-note {{candidate}}
52 enum E : int {}; // expected-note {{candidate}}
53
54 static_assert(&f != &M::f, ""); // expected-error {{reference to overloaded function could not be resolved}}
55 static_assert(&m != &M::m, ""); // expected-error {{ambiguous}}
56 typedef S X; // expected-error {{ambiguous}}
57 typedef E Y; // expected-error {{ambiguous}}
58
59 // When named by (unqualified) template-id, we do look in the inline
60 // namespace set. See [namespace.def]p8, [temp.explicit]p3,
61 // [temp.expl.spec]p2.
62 //
63 // This is not explicitly specified for partial specializations, but
64 // that is just a language defect.
ft()65 template<> void ft<int>() {}
66 template void ft<char>(); // expected-error {{undefined}}
67
68 template<typename T> int mt<T*>;
69 template<> int mt<int>;
70 template int mt<int*>;
71 template int mt<char>; // expected-error {{undefined}}
72
73 template<typename T> struct U<T*> {};
74 template<> struct U<int> {};
75 template struct U<int*>;
76 template struct U<char>; // expected-error {{undefined}}
77 }
78
79 // When named by qualified-id, we *do* look in the inline namespace set.
g()80 void N::g() {}
81 int N::n;
82 struct N::T {};
83 enum N::F : int {};
84
85 static_assert(&N::g == &N::M::g, "");
86 static_assert(&N::n == &N::M::n, "");
87 typedef N::T X;
88 typedef N::M::T X;
89 typedef N::F Y;
90 typedef N::M::F Y;
91
gt()92 template<> void N::gt<int>() {}
93 template void N::gt<char>(); // expected-error {{undefined}}
94
95 template<typename T> int N::nt<T*>;
96 template<> int N::nt<int>;
97 template int N::nt<int*>;
98 template int N::nt<char>; // expected-error {{undefined}}
99
100 template<typename T> struct N::V<T*> {};
101 template<> struct N::V<int> {};
102 template struct N::V<int*>;
103 template struct N::V<char>; // expected-error {{undefined}}
104 }
105