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// RUN: %clang_cc1 -std=c++98 %s -verify=expected,cxx98 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++11 %s -verify=expected -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++14 %s -verify=expected -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++17 %s -verify=expected -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++20 %s -verify=expected -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++23 %s -verify=expected -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++2c %s -verify=expected -fexceptions -fcxx-exceptions -pedantic-errors
namespace cwg1110 { // cwg1110: 3.1
#if __cplusplus >= 201103L
template <typename T>
T return_T();
struct A;
template <typename>
struct B;
decltype(return_T<A>())* a;
decltype(return_T<B<int>>())* b;
#endif
} // namespace cwg1110
namespace cwg1111 { // cwg1111: partial
namespace example1 {
template <typename> struct set; // #cwg1111-struct-set
struct X {
template <typename T> void set(const T &value); // #cwg1111-func-set
};
void foo() {
X x;
// FIXME: should we backport C++11 behavior?
x.set<double>(3.2);
// cxx98-error@-1 {{lookup of 'set' in member access expression is ambiguous; using member of 'X'}}
// cxx98-note@#cwg1111-func-set {{lookup in the object type 'X' refers here}}
// cxx98-note@#cwg1111-struct-set {{lookup from the current scope refers here}}
}
struct Y {};
void bar() {
Y y;
y.set<double>(3.2);
// expected-error@-1 {{no member named 'set' in 'cwg1111::example1::Y'}}
}
} // namespace example1
namespace example2 {
struct A {};
namespace N {
struct A {
void g() {}
template <class T> operator T();
};
} // namespace N
void baz() {
N::A a;
a.operator A();
}
} // namespace example2
namespace example3 {
struct A {
operator int();
} a;
void foo() {
typedef int T;
a.operator T(); // T is found using unqualified lookup
// after qualified lookup in A fails.
}
} // namespace example3
namespace example4 {
struct A {
typedef int T; // #cwg1111-A-T
operator T();
};
struct B : A {
operator T();
} b;
void foo() {
b.A::operator T(); // FIXME: qualified lookup should find T in A.
// expected-error@-1 {{unknown type name 'T'}}
// expected-note@#cwg1111-A-T {{'A::T' declared here}}
}
} // namespace example4
namespace example5 {
template <class T1> struct A {
operator T1();
};
template <class T2> struct B : A<T2> {
operator T2();
void foo() {
// In both cases, during instantiation, qualified lookup for T2 wouldn't be able
// to find anything, so T2 has to be found by unqualified lookup.
// After that, 'operator T2()' is found in A<T2> by qualfied lookup.
T2 a = A<T2>::operator T2();
T2 b = ((A<T2> *)this)->operator T2();
}
};
} // namespace example5
} // namespace cwg1111
namespace cwg1113 { // cwg1113: partial
namespace named {
extern int a; // #cwg1113-a
static int a;
// expected-error@-1 {{static declaration of 'a' follows non-static}}
// expected-note@#cwg1113-a {{previous declaration is here}}
}
namespace {
extern int a;
static int a; // ok, both declarations have internal linkage
int b = a;
}
// FIXME: Per CWG1113 and CWG4, this is ill-formed due to ambiguity: the second
// 'f' has internal linkage, and so does not have C language linkage, so is
// not a redeclaration of the first 'f'.
//
// To avoid a breaking change here, Clang ignores the "internal linkage" effect
// of anonymous namespaces on declarations declared within an 'extern "C"'
// linkage-specification.
extern "C" void f();
namespace {
extern "C" void f();
}
void g() { f(); }
} // namespace cwg1113
// cwg1150: na
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