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// 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'}}
}
}
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