| 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 | |