69 lines
1.5 KiB
C++
69 lines
1.5 KiB
C++
// RUN: %clang_cc1 -fms-extensions -std=c++11 %s -verify
|
|
|
|
struct Nontemplate {
|
|
typedef int type;
|
|
};
|
|
|
|
template<typename T>
|
|
struct X {
|
|
__if_exists(Nontemplate::type) {
|
|
typedef Nontemplate::type type;
|
|
}
|
|
|
|
__if_exists(Nontemplate::value) {
|
|
typedef Nontemplate::value type2;
|
|
}
|
|
|
|
__if_not_exists(Nontemplate::value) {
|
|
typedef int type3;
|
|
}
|
|
|
|
__if_exists(T::X) { // expected-warning{{dependent __if_exists declarations are ignored}}
|
|
typedef T::X type4;
|
|
}
|
|
};
|
|
|
|
X<int>::type i1;
|
|
X<int>::type2 i2; // expected-error{{no type named 'type2' in 'X<int>'}}
|
|
X<int>::type3 i3;
|
|
X<int>::type4 i4; // expected-error{{no type named 'type4' in 'X<int>'}}
|
|
|
|
struct HasFoo {
|
|
void foo();
|
|
};
|
|
struct HasBar {
|
|
void bar(int);
|
|
void bar(float);
|
|
};
|
|
|
|
template<typename T>
|
|
void f(T t) {
|
|
__if_exists(T::foo) {
|
|
{ }
|
|
t.foo();
|
|
}
|
|
|
|
__if_not_exists(T::bar) {
|
|
int *i = t; // expected-error{{no viable conversion from 'HasFoo' to 'int *'}}
|
|
{ }
|
|
}
|
|
|
|
int array2[] = {
|
|
0,
|
|
__if_exists(T::bar) {2, }// expected-warning{{dependent __if_exists declarations are ignored}}
|
|
3
|
|
};
|
|
}
|
|
|
|
template void f(HasFoo); // expected-note{{in instantiation of function template specialization 'f<HasFoo>' requested here}}
|
|
template void f(HasBar);
|
|
|
|
template<typename T, typename ...Ts>
|
|
void g(T, Ts...) {
|
|
__if_exists(T::operator Ts) { // expected-error{{__if_exists name contains unexpanded parameter pack 'Ts'}}
|
|
}
|
|
|
|
__if_not_exists(Ts::operator T) { // expected-error{{__if_not_exists name contains unexpanded parameter pack 'Ts'}}
|
|
}
|
|
}
|