// RUN: %clang_cc1 -std=c++98 %s -verify=expected,cxx98-11,cxx98 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++11 %s -verify=expected,cxx98-11,since-cxx11 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++14 %s -verify=expected,since-cxx14,since-cxx11 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++17 %s -verify=expected,since-cxx14,since-cxx11 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++20 %s -verify=expected,since-cxx14,since-cxx11 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++23 %s -verify=expected,since-cxx14,since-cxx11 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++2c %s -verify=expected,since-cxx14,since-cxx11 -fexceptions -fcxx-exceptions -pedantic-errors
namespace std { struct type_info; }
namespace cwg1900 { // cwg1900: 2.7
// See the test for CWG1477 for detailed analysis
namespace N {
struct A {
friend int f();
};
}
int N::f() { return 0; }
int N::g() { return 0; }
// expected-error@-1 {{out-of-line definition of 'g' does not match any declaration in namespace 'cwg1900::N'}}
} // namespace cwg1900
namespace cwg1902 { // cwg1902: 3.7
struct A {};
struct B {
B(A); // #cwg1902-B-A
B() = delete; // #cwg1902-B-ctor
// cxx98-error@-1 {{deleted function definitions are a C++11 extension}}
B(const B&) = delete; // #cwg1902-B-copy-ctor
// cxx98-error@-1 {{deleted function definitions are a C++11 extension}}
operator A();
};
extern B b1;
B b2(b1);
// expected-error@-1 {{call to deleted constructor of 'B'}}
// expected-note@#cwg1902-B-copy-ctor {{'B' has been explicitly marked deleted here}}
#if __cplusplus >= 201103L
// This is ambiguous, even though calling the B(const B&) constructor would
// both directly and indirectly call a deleted function.
B b({});
// since-cxx11-error@-1 {{call to constructor of 'B' is ambiguous}}
// since-cxx11-note@#cwg1902-B-A {{candidate constructor}}
// since-cxx11-note@#cwg1902-B-copy-ctor {{candidate constructor has been explicitly deleted}}
#endif
}
namespace cwg1903 { // cwg1903: 2.7
namespace A {
struct a {};
int a;
namespace B {
int b;
}
using namespace B;
namespace {
int c;
}
namespace D {
int d;
}
using D::d;
}
namespace X {
using A::a;
using A::b;
using A::c;
using A::d;
struct a *p;
}
}
namespace cwg1909 { // cwg1909: 3.7
struct A {
template<typename T> struct A {};
// expected-error@-1 {{member 'A' has the same name as its class}}
};
struct B {
template<typename T> void B() {}
// expected-error@-1 {{constructor cannot have a return type}}
};
struct C {
template<typename T> static int C;
// expected-error@-1 {{member 'C' has the same name as its class}}
// cxx98-11-error@-2 {{variable templates are a C++14 extension}}
};
struct D {
template<typename T> using D = int;
// cxx98-error@-1 {{alias declarations are a C++11 extension}}
// expected-error@-2 {{member 'D' has the same name as its class}}
};
}
namespace cwg1918 { // cwg1918: no
template<typename T> struct A {
class B {
class C {};
};
};
class X {
static int x;
// FIXME: this is ill-formed, because A<T>::B::C does not end with a simple-template-id
template <typename T>
friend class A<T>::B::C;
// expected-warning@-1 {{dependent nested name specifier 'A<T>::B::' for friend class declaration is not supported; turning off access control for 'X'}}
};
template<> struct A<int> {
typedef struct Q B;
};
struct Q {
class C {
// FIXME: 'f' is not a friend, so 'X::x' is not accessible
int f() { return X::x; }
};
};
} // namespace cwg1918
namespace cwg1940 { // cwg1940: 3.5
#if __cplusplus >= 201103L
static union {
static_assert(true, ""); // ok
static_assert(false, "");
// since-cxx11-error@-1 {{static assertion failed}}
int not_empty;
};
#endif
}
namespace cwg1941 { // cwg1941: 3.9
#if __cplusplus >= 201402L
template<typename X>
struct base {
template<typename T>
base(T a, T b, decltype(void(*T()), 0) = 0) {
while (a != b) (void)*a++;
}
template<typename T>
base(T a, X x, decltype(void(T(0) * 1), 0) = 0) {
for (T n = 0; n != a; ++n) (void)X(x);
}
};
struct derived : base<int> {
using base::base;
};
struct iter {
iter operator++(int);
int operator*();
friend bool operator!=(iter, iter);
} it, end;
derived d1(it, end);
derived d2(42, 9);
#endif
}
namespace cwg1945 { // cwg1945: no
template<typename T> struct A {
class B {
class C {};
};
};
class X {
static int x;
// FIXME: this is ill-formed, because A<T>::B::C does not end with a simple-template-id
template <typename T>
friend class A<T>::B::C;
// expected-warning@-1 {{dependent nested name specifier 'A<T>::B::' for friend class declaration is not supported; turning off access control for 'X'}}
};
} // namespace cwg1945
namespace cwg1947 { // cwg1947: 3.5
#if __cplusplus >= 201402L
unsigned o = 0'01; // ok
unsigned b = 0b'01;
// since-cxx14-error@-1 {{invalid digit 'b' in octal constant}}
unsigned x = 0x'01;
// since-cxx14-error@-1 {{invalid suffix 'x'01' on integer constant}}
#endif
}
#if __cplusplus >= 201103L
// cwg1948: 3.5
// FIXME: This diagnostic could be improved.
void *operator new(__SIZE_TYPE__) noexcept { return nullptr; }
// since-cxx11-error@-1 {{exception specification in declaration does not match previous declaration}}
#endif
namespace cwg1959 { // cwg1959: 3.9
#if __cplusplus >= 201103L
struct b;
struct c;
struct a {
a() = default;
a(const a &) = delete; // #cwg1959-copy-ctor
a(const b &) = delete; // not inherited
a(c &&) = delete; // #cwg1959-move-ctor
template<typename T> a(T) = delete; // #cwg1959-temp-ctor
};
struct b : a { // #cwg1959-b
using a::a; // #cwg1959-using-a
};
a x;
// FIXME: As a resolution to an open DR against P0136R0, we disallow
// use of inherited constructors to construct from a single argument
// where the base class is reference-related to the argument type.
b y = x;
// since-cxx11-error@-1 {{no viable conversion from 'a' to 'b'}}
// since-cxx11-note@#cwg1959-move-ctor {{candidate inherited constructor not viable: no known conversion from 'a' to 'c &&' for 1st argument}}
// since-cxx11-note@#cwg1959-using-a {{constructor from base class 'a' inherited here}}
// since-cxx11-note@#cwg1959-b {{candidate constructor (the implicit copy constructor) not viable: cannot bind base class object of type 'a' to derived class reference 'const b &' for 1st argument}}
// since-cxx11-note@#cwg1959-temp-ctor {{candidate template ignored: instantiation would take its own class type by value}}
// since-cxx11-note@#cwg1959-using-a {{constructor from base class 'a' inherited here}}
b z = z;
// since-cxx11-error@-1 {{call to implicitly-deleted copy constructor of 'b'}}
// since-cxx11-note@#cwg1959-b {{copy constructor of 'b' is implicitly deleted because base class 'a' has a deleted copy constructor}}
// since-cxx11-note@#cwg1959-copy-ctor {{'a' has been explicitly marked deleted here}}
struct c : a {
using a::a;
c(const c &);
};
// FIXME: As a resolution to an open DR against P0136R0, we disallow
// use of inherited constructors to construct from a single argument
// where the base class is reference-related to the argument type.
c q(static_cast<c&&>(q));
#endif
}
namespace cwg1960 { // cwg1960: no
struct A {
void f() {}
protected:
void g() {}
};
struct B: A {
private:
using A::f;
using A::g;
};
struct C : B {
// FIXME: both declarations are ill-formed, because A::f and A::g
// are not accessible.
using A::f;
using A::g;
};
}
namespace cwg1966 { // cwg1966: 11
#if __cplusplus >= 201103L
struct A {
enum E : int {1};
// since-cxx11-error@-1 {{expected identifier}} (not bit-field)
};
auto *p1 = new enum E : int;
// since-cxx11-error@-1 {{non-defining declaration of enumeration with a fixed underlying type is only permitted as a standalone declaration}}
auto *p2 = new enum F : int {};
// since-cxx11-error@-1 {{non-defining declaration of enumeration with a fixed underlying type is only permitted as a standalone declaration}}
auto *p3 = true ? new enum G : int {};
// since-cxx11-error@-1 {{ISO C++ forbids forward references to 'enum' types}}
// since-cxx11-error@-2 {{allocation of incomplete type 'enum G'}}
// since-cxx11-note@-3 {{forward declaration of 'cwg1966::G'}}
auto h() -> enum E : int {};
// since-cxx11-error@-1 {{non-defining declaration of enumeration with a fixed underlying type is only permitted as a standalone declaration}}
enum X : enum Y : int {} {};
// since-cxx11-error@-1 {{'cwg1966::Y' cannot be defined in a type specifier}}
struct Q {
// FIXME: can we emit something nicer than that?
enum X : enum Y : int {} {};
// since-cxx11-error@-1 {{non-defining declaration of enumeration with a fixed underlying type is only permitted as a standalone declaration; missing list of enumerators?}}
// since-cxx11-error@-2 {{non-integral type 'enum Y' is an invalid underlying type}}
// since-cxx11-error@-3 {{anonymous bit-field cannot have a default member initializer}}
};
#endif
}
namespace cwg1968 { // cwg1968: no
#if __cplusplus >= 201103L
// FIXME: According to CWG1968, both of these should be considered
// non-constant.
static_assert(&typeid(int) == &typeid(int), "");
constexpr const std::type_info *f() { return &typeid(int); }
static_assert(f() == f(), "");
#endif
}
namespace cwg1991 { // cwg1991: 3.9
#if __cplusplus >= 201103L
struct A {
A(int, int) = delete;
};
struct B : A {
using A::A;
B(int, int, int = 0);
};
// FIXME: As a resolution to an open DR against P0136R1, we treat derived
// class constructors as better than base class constructors in the presence
// of ambiguity.
B b(0, 0); // ok, calls B constructor
#endif
}
// cwg1994: dup 529
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