1 | // RUN: %clang_cc1 -fms-extensions -std=c++11 %s -verify |
2 | |
3 | struct Nontemplate { |
4 | typedef int type; |
5 | }; |
6 | |
7 | template<typename T> |
8 | struct X { |
9 | __if_exists(Nontemplate::type) { |
10 | typedef Nontemplate::type type; |
11 | } |
12 | |
13 | __if_exists(Nontemplate::value) { |
14 | typedef Nontemplate::value type2; |
15 | } |
16 | |
17 | __if_not_exists(Nontemplate::value) { |
18 | typedef int type3; |
19 | } |
20 | |
21 | __if_exists(T::X) { // expected-warning{{dependent __if_exists declarations are ignored}} |
22 | typedef T::X type4; |
23 | } |
24 | }; |
25 | |
26 | X<int>::type i1; |
27 | X<int>::type2 i2; // expected-error{{no type named 'type2' in 'X<int>'}} |
28 | X<int>::type3 i3; |
29 | X<int>::type4 i4; // expected-error{{no type named 'type4' in 'X<int>'}} |
30 | |
31 | struct HasFoo { |
32 | void foo(); |
33 | }; |
34 | struct HasBar { |
35 | void bar(int); |
36 | void bar(float); |
37 | }; |
38 | |
39 | template<typename T> |
40 | void f(T t) { |
41 | __if_exists(T::foo) { |
42 | { } |
43 | t.foo(); |
44 | } |
45 | |
46 | __if_not_exists(T::bar) { |
47 | int *i = t; // expected-error{{no viable conversion from 'HasFoo' to 'int *'}} |
48 | { } |
49 | } |
50 | |
51 | int array2[] = { |
52 | 0, |
53 | __if_exists(T::bar) {2, }// expected-warning{{dependent __if_exists declarations are ignored}} |
54 | 3 |
55 | }; |
56 | } |
57 | |
58 | template void f(HasFoo); // expected-note{{in instantiation of function template specialization 'f<HasFoo>' requested here}} |
59 | template void f(HasBar); |
60 | |
61 | template<typename T, typename ...Ts> |
62 | void g(T, Ts...) { |
63 | __if_exists(T::operator Ts) { // expected-error{{__if_exists name contains unexpanded parameter pack 'Ts'}} |
64 | } |
65 | |
66 | __if_not_exists(Ts::operator T) { // expected-error{{__if_not_exists name contains unexpanded parameter pack 'Ts'}} |
67 | } |
68 | } |
69 | |