1 | // RUN: %clang_cc1 -verify -std=c++1y %s |
2 | |
3 | // Example from the standard. |
4 | namespace X { |
5 | void p() { |
6 | q(); // expected-error {{undeclared}} |
7 | extern void q(); |
8 | } |
9 | void middle() { |
10 | q(); // expected-error {{undeclared}} |
11 | } |
12 | void q() { /*...*/ } |
13 | void bottom() { |
14 | q(); |
15 | } |
16 | } |
17 | int q(); |
18 | |
19 | namespace Test1 { |
20 | void f() { |
21 | extern int a; // expected-note {{previous}} |
22 | int g(void); // expected-note {{previous}} |
23 | } |
24 | double a; // expected-error {{different type: 'double' vs 'int'}} |
25 | double g(); // expected-error {{differ only in their return type}} |
26 | } |
27 | |
28 | namespace Test2 { |
29 | void f() { |
30 | extern int a; // expected-note {{previous}} |
31 | int g(void); // expected-note {{previous}} |
32 | } |
33 | void h() { |
34 | extern double a; // expected-error {{different type: 'double' vs 'int'}} |
35 | double g(void); // expected-error {{differ only in their return type}} |
36 | } |
37 | } |
38 | |
39 | namespace Test3 { |
40 | constexpr void (*f())() { |
41 | void h(); |
42 | return &h; |
43 | } |
44 | constexpr void (*g())() { |
45 | void h(); |
46 | return &h; |
47 | } |
48 | static_assert(f() == g(), ""); |
49 | } |
50 | |
51 | namespace Test4 { |
52 | template<typename T> |
53 | constexpr void (*f())() { |
54 | void h(); |
55 | return &h; |
56 | } |
57 | static_assert(f<int>() == f<char>(), ""); |
58 | void h(); |
59 | static_assert(f<int>() == &h, ""); |
60 | } |
61 | |
62 | namespace Test5 { |
63 | constexpr auto f() -> void (*)() { |
64 | void g(); |
65 | struct X { |
66 | friend void g(); |
67 | static constexpr auto h() -> void (*)() { return g; } |
68 | }; |
69 | return X::h(); |
70 | } |
71 | void g(); |
72 | static_assert(f() == g, ""); |
73 | } |
74 | |