// RUN: %clang_cc1 -std=c++98 %s -verify=expected,cxx98,cxx98-11,cxx98-14,cxx98-17 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++11 %s -verify=expected,since-cxx11,cxx98-11,cxx98-14,cxx98-17 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++14 %s -verify=expected,since-cxx11,since-cxx14,cxx98-14,cxx98-17 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++17 %s -verify=expected,since-cxx11,since-cxx14,since-cxx17,cxx98-17 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++20 %s -verify=expected,since-cxx11,since-cxx14,since-cxx17 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++23 %s -verify=expected,since-cxx11,since-cxx14,since-cxx17 -fexceptions -fcxx-exceptions -pedantic-errors
// FIXME: diagnostic above is emitted only on Windows platforms
// PR13819 -- __SIZE_TYPE__ is incompatible.
typedef __SIZE_TYPE__ size_t;
// cxx98-error@-1 0-1 {{'long long' is a C++11 extension}}
#if __cplusplus == 199711L
#define static_assert(...) __extension__ _Static_assert(__VA_ARGS__)
// cxx98-error@-1 {{variadic macros are a C99 feature}}
#endif
#if __cplusplus == 199711L
#define __enable_constant_folding(x) (__builtin_constant_p(x) ? (x) : (x))
#else
#define __enable_constant_folding
#endif
namespace cwg200 { // cwg200: dup 214
template <class T> T f(int);
template <class T, class U> T f(U) = delete;
// cxx98-error@-1 {{deleted function definitions are a C++11 extension}}
void g() {
f<int>(1);
}
}
// cwg201 is in cwg201.cpp
namespace cwg202 { // cwg202: 3.1
template<typename T> T f();
template<int (*g)()> struct X {
static_assert(__enable_constant_folding(g == &f<int>), "");
};
template struct X<f>;
}
// cwg204: sup 820
namespace cwg206 { // cwg206: yes
struct S; // #cwg206-S
template<typename T> struct Q { S s; };
// expected-error@-1 {{field has incomplete type 'S'}}
// expected-note@#cwg206-S {{forward declaration of 'cwg206::S'}}
template<typename T> void f() { S s; }
// expected-error@-1 {{variable has incomplete type 'S'}}
// expected-note@#cwg206-S {{forward declaration of 'cwg206::S'}}
}
namespace cwg207 { // cwg207: yes
class A {
protected:
static void f() {}
};
class B : A {
public:
using A::f;
void g() {
A::f();
f();
}
};
}
// cwg208 FIXME: write codegen test
namespace cwg209 { // cwg209: 3.2
class A {
void f(); // #cwg209-A-f
};
class B {
friend void A::f();
// expected-error@-1 {{friend function 'f' is a private member of 'cwg209::A'}}
// expected-note@#cwg209-A-f {{implicitly declared private here}}
};
}
// cwg210 is in cwg210.cpp
namespace cwg211 { // cwg211: yes
struct A {
A() try {
throw 0;
} catch (...) {
return;
// expected-error@-1 {{return in the catch of a function try block of a constructor is illegal}}
}
};
}
namespace cwg213 { // cwg213: yes
template <class T> struct A : T {
void h(T t) {
char &r1 = f(t);
int &r2 = g(t);
// expected-error@-1 {{explicit qualification required to use member 'g' from dependent base class}}
// expected-note@#cwg213-instantiation {{in instantiation of member function 'cwg213::A<cwg213::B>::h' requested here}}
// expected-note@#cwg213-B-g {{member is declared here}}
}
};
struct B {
int &f(B);
int &g(B); // #cwg213-B-g
};
char &f(B);
template void A<B>::h(B); // #cwg213-instantiation
}
namespace cwg214 { // cwg214: yes
template<typename T, typename U> T checked_cast(U from) { U::error; }
template<typename T, typename U> T checked_cast(U *from);
class C {};
void foo(int *arg) { checked_cast<const C *>(arg); }
template<typename T> T f(int);
template<typename T, typename U> T f(U) { T::error; }
void g() {
f<int>(1);
}
}
namespace cwg215 { // cwg215: 2.9
template<typename T> class X {
friend void T::foo();
int n;
};
struct Y {
void foo() { (void)+X<Y>().n; }
};
}
namespace cwg216 { // cwg216: no
// FIXME: Should reject this: 'f' has linkage but its type does not,
// and 'f' is odr-used but not defined in this TU.
typedef enum { e } *E;
void f(E);
void g(E e) { f(e); }
struct S {
// FIXME: Should reject this: 'f' has linkage but its type does not,
// and 'f' is odr-used but not defined in this TU.
typedef enum { e } *E;
void f(E);
};
void g(S s, S::E e) { s.f(e); }
}
namespace cwg217 { // cwg217: yes
template<typename T> struct S {
void f(int);
};
template<typename T> void S<T>::f(int = 0) {}
// expected-error@-1 {{default arguments cannot be added to an out-of-line definition of a member of a class template}}
}
namespace cwg218 { // cwg218: yes
// NB: also dup 405
namespace A {
struct S {};
void f(S);
}
namespace B {
struct S {};
void f(S);
}
struct C {
int f;
void test1(A::S as) { f(as); }
// expected-error@-1 {{called object type 'int' is not a function or function pointer}}
void test2(A::S as) { void f(); f(as); }
// expected-error@-1 {{too many arguments to function call, expected 0, have 1}}
// expected-note@-2 {{'f' declared here}}
void test3(A::S as) { using A::f; f(as); } // ok
void test4(A::S as) { using B::f; f(as); } // ok
void test5(A::S as) { int f; f(as); }
// expected-error@-1 {{called object type 'int' is not a function or function pointer}}
void test6(A::S as) { struct f {}; (void) f(as); }
// expected-error@-1 {{no matching conversion for functional-style cast from 'A::S' to 'f'}}
// expected-note@-2 {{candidate constructor (the implicit copy constructor) not viable: no known conversion from 'A::S' to 'const f' for 1st argument}}
// since-cxx11-note@-3 {{candidate constructor (the implicit move constructor) not viable: no known conversion from 'A::S' to 'f' for 1st argument}}
// expected-note@-4 {{candidate constructor (the implicit default constructor) not viable: requires 0 arguments, but 1 was provided}}
};
namespace D {
struct S {};
struct X { void operator()(S); } f;
}
void testD(D::S ds) { f(ds); }
// expected-error@-1 {{use of undeclared identifier 'f'}}
namespace E {
struct S {};
struct f { f(S); };
}
void testE(E::S es) { f(es); }
// expected-error@-1 {{use of undeclared identifier 'f'}}
namespace F {
struct S {
template<typename T> friend void f(S, T) {}
};
}
void testF(F::S fs) { f(fs, 0); }
namespace G {
namespace X {
int f;
struct A {};
}
namespace Y {
template<typename T> void f(T);
struct B {};
}
template<typename A, typename B> struct C {};
}
void testG(G::C<G::X::A, G::Y::B> gc) { f(gc); }
}
// cwg219: na
// cwg220: na
namespace cwg221 { // cwg221: 3.6
struct A { // #cwg221-S
A &operator=(int&); // #cwg221-S-copy-assign
A &operator+=(int&);
static A &operator=(A&, double&);
// expected-error@-1 {{overloaded 'operator=' cannot be a static member function}}
static A &operator+=(A&, double&);
// expected-error@-1 {{overloaded 'operator+=' cannot be a static member function}}
friend A &operator=(A&, char&);
// expected-error@-1 {{overloaded 'operator=' must be a non-static member function}}
friend A &operator+=(A&, char&);
};
A &operator=(A&, float&);
// expected-error@-1 {{overloaded 'operator=' must be a non-static member function}}
A &operator+=(A&, float&);
void test(A a, int n, char c, float f) {
a = n;
a += n;
a = c;
// expected-error@-1 {{no viable overloaded '='}}
// expected-note@#cwg221-S-copy-assign {{candidate function not viable: no known conversion from 'char' to 'int &' for 1st argument}}
// since-cxx11-note@#cwg221-S {{candidate function (the implicit move assignment operator) not viable: no known conversion from 'char' to 'A' for 1st argument}}
// expected-note@#cwg221-S {{candidate function (the implicit copy assignment operator) not viable: no known conversion from 'char' to 'const A' for 1st argument}}
a += c;
a = f;
// expected-error@-1 {{no viable overloaded '='}}
// expected-note@#cwg221-S-copy-assign {{candidate function not viable: no known conversion from 'float' to 'int &' for 1st argument}}
// since-cxx11-note@#cwg221-S {{candidate function (the implicit move assignment operator) not viable: no known conversion from 'float' to 'A' for 1st argument}}
// expected-note@#cwg221-S {{candidate function (the implicit copy assignment operator) not viable: no known conversion from 'float' to 'const A' for 1st argument}}
a += f;
}
}
namespace cwg222 { // cwg222: dup 637
void f(int a, int b, int c, int *x) {
#pragma clang diagnostic push
#pragma clang diagnostic warning "-Wunsequenced"
void((a += b) += c);
void((a += b) + (a += c));
// expected-warning@-1 {{multiple unsequenced modifications to 'a'}}
x[a++] = a;
// cxx98-14-warning@-1 {{unsequenced modification and access to 'a'}}
a = b = 0; // ok, read and write of 'b' are sequenced
a = (b = a++);
// cxx98-14-warning@-1 {{multiple unsequenced modifications to 'a'}}
a = (b = ++a);
#pragma clang diagnostic pop
}
}
// cwg223: na
namespace cwg224 { // cwg224: 16
namespace example1 {
template <class T> class A {
typedef int type;
A::type a;
A<T>::type b;
A<T*>::type c;
// cxx98-17-error@-1 {{missing 'typename' prior to dependent type name A<T *>::type; implicit 'typename' is a C++20 extension}}
::cwg224::example1::A<T>::type d;
class B {
typedef int type;
A::type a;
A<T>::type b;
A<T*>::type c;
// cxx98-17-error@-1 {{missing 'typename' prior to dependent type name A<T *>::type; implicit 'typename' is a C++20 extension}}
::cwg224::example1::A<T>::type d;
B::type e;
A<T>::B::type f;
A<T*>::B::type g;
// cxx98-17-error@-1 {{missing 'typename' prior to dependent type name A<T *>::B::type; implicit 'typename' is a C++20 extension}}
typename A<T*>::B::type h;
};
};
template <class T> class A<T*> {
typedef int type;
A<T*>::type a;
A<T>::type b;
// cxx98-17-error@-1 {{missing 'typename' prior to dependent type name A<T>::type; implicit 'typename' is a C++20 extension}}
};
template <class T1, class T2, int I> struct B {
typedef int type;
B<T1, T2, I>::type b1;
B<T2, T1, I>::type b2;
// cxx98-17-error@-1 {{missing 'typename' prior to dependent type name B<T2, T1, I>::type; implicit 'typename' is a C++20 extension}}
typedef T1 my_T1;
static const int my_I = I;
static const int my_I2 = I+0;
static const int my_I3 = my_I;
B<my_T1, T2, my_I>::type b3;
// cxx98-17-error@-1 {{missing 'typename' prior to dependent type name B<my_T1, T2, my_I>::type; implicit 'typename' is a C++20 extension}}
B<my_T1, T2, my_I2>::type b4;
// cxx98-17-error@-1 {{missing 'typename' prior to dependent type name B<my_T1, T2, my_I2>::type; implicit 'typename' is a C++20 extension}}
B<my_T1, T2, my_I3>::type b5;
// cxx98-17-error@-1 {{missing 'typename' prior to dependent type name B<my_T1, T2, my_I3>::type; implicit 'typename' is a C++20 extension}}
};
}
namespace example2 {
template <int, typename T> struct X { typedef T type; };
template <class T> class A {
static const int i = 5;
X<i, int>::type w;
X<A::i, char>::type x;
X<A<T>::i, double>::type y;
X<A<T*>::i, long>::type z;
// cxx98-17-error@-1 {{missing 'typename' prior to dependent type name X<A<T *>::i, long>::type; implicit 'typename' is a C++20 extension}}
int f();
};
template <class T> int A<T>::f() {
return i;
}
}
}
// cwg225: yes
template<typename T> void cwg225_f(T t) { cwg225_g(t); }
// expected-error@-1 {{call to function 'cwg225_g' that is neither visible in the template definition nor found by argument-dependent lookup}}
// expected-note@#cwg225-f {{in instantiation of function template specialization 'cwg225_f<int>' requested here}}
// expected-note@#cwg225-g {{'cwg225_g' should be declared prior to the call site}}
void cwg225_g(int); // #cwg225-g
template void cwg225_f(int); // #cwg225-f
namespace cwg226 { // cwg226: no
// FIXME: This appears to be wrong: default arguments for function templates
// are listed as a defect (in c++98) not an extension. EDG accepts them in
// strict c++98 mode.
template<typename T = void> void f() {}
// cxx98-error@-1 {{default template arguments for a function template are a C++11 extension}}
template<typename T> struct S {
template<typename U = void> void g();
// cxx98-error@-1 {{default template arguments for a function template are a C++11 extension}}
template<typename U> struct X;
template<typename U> void h();
};
template<typename T> template<typename U> void S<T>::g() {}
template<typename T> template<typename U = void> struct S<T>::X {};
// expected-error@-1 {{cannot add a default template argument to the definition of a member of a class template}}
template<typename T> template<typename U = void> void S<T>::h() {}
// expected-error@-1 {{cannot add a default template argument to the definition of a member of a class template}}
template<typename> void friend_h();
struct A {
// FIXME: This is ill-formed.
template<typename=void> struct friend_B;
// FIXME: f, h, and i are ill-formed.
// f is ill-formed because it is not a definition.
// h and i are ill-formed because they are not the only declarations of the
// function in the translation unit.
template<typename=void> void friend_f();
// cxx98-error@-1 {{default template arguments for a function template are a C++11 extension}}
template<typename=void> void friend_g() {}
// cxx98-error@-1 {{default template arguments for a function template are a C++11 extension}}
template<typename=void> void friend_h() {}
// cxx98-error@-1 {{default template arguments for a function template are a C++11 extension}}
template<typename=void> void friend_i() {}
// cxx98-error@-1 {{default template arguments for a function template are a C++11 extension}}
};
template<typename> void friend_i();
template<typename=void, typename X> void foo(X) {}
// cxx98-error@-1 {{default template arguments for a function template are a C++11 extension}}
template<typename=void, typename X> struct Foo {};
// expected-error@-1 {{template parameter missing a default argument}}
// expected-note@-2 {{previous default template argument defined here}}
template<typename=void, typename X, typename, typename Y> int foo(X, Y);
// cxx98-error@-1 {{default template arguments for a function template are a C++11 extension}}
template<typename, typename X, typename=void, typename Y> int foo(X, Y);
// cxx98-error@-1 {{default template arguments for a function template are a C++11 extension}}
int x = foo(0, 0);
}
void cwg227(bool b) { // cwg227: yes
if (b)
int n;
else
int n;
}
namespace cwg228 { // cwg228: yes
template <class T> struct X {
void f();
};
template <class T> struct Y {
void g(X<T> x) { x.template X<T>::f(); }
};
}
namespace cwg229 { // cwg229: 2.9
template<typename T> void f();
template<typename T> void f<T*>() {}
// expected-error@-1 {{function template partial specialization is not allowed}}
template<> void f<int>() {}
}
namespace cwg230 { // cwg230: 3.0
struct S {
S() { f(); }
// expected-warning@-1 {{call to pure virtual member function 'f' has undefined behavior; overrides of 'f' in subclasses are not available in the constructor of 'cwg230::S'}}
// expected-note@#cwg230-f {{'f' declared here}}
virtual void f() = 0; // #cwg230-f
};
}
namespace cwg231 { // cwg231: yes
namespace outer {
namespace inner {
int i; // #cwg231-i
}
void f() { using namespace inner; }
int j = i;
// expected-error@-1 {{use of undeclared identifier 'i'; did you mean 'inner::i'?}}
// expected-note@#cwg231-i {{'inner::i' declared here}}
}
}
// cwg234: na
// cwg235: na
namespace cwg236 { // cwg236: 3.2
void *p = int();
// cxx98-warning@-1 {{expression which evaluates to zero treated as a null pointer constant of type 'void *'}}
// since-cxx11-error@-2 {{cannot initialize a variable of type 'void *' with an rvalue of type 'int'}}
}
namespace cwg237 { // cwg237: dup 470
template<typename T> struct A { void f() { T::error; } };
template<typename T> struct B : A<T> {};
template struct B<int>; // ok
}
namespace cwg239 { // cwg239: yes
namespace NS {
class T {};
void f(T);
float &g(T, int);
}
NS::T parm;
int &g(NS::T, float);
int main() {
f(parm);
float &r = g(parm, 1);
extern int &g(NS::T, float);
int &s = g(parm, 1);
}
}
// cwg240: dup 616
namespace cwg241 { // cwg241: yes
namespace A {
struct B {};
template <int X> void f(); // #cwg241-A-f
template <int X> void g(B);
}
namespace C {
template <class T> void f(T t); // #cwg241-C-f
template <class T> void g(T t); // #cwg241-C-g
}
void h(A::B b) {
f<3>(b);
// expected-error@-1 {{no matching function for call to 'f'}}
// expected-note@#cwg241-A-f {{candidate function template not viable: requires 0 arguments, but 1 was provided}}
// cxx98-17-error@-3 {{use of function template name with no prior declaration in function call with explicit template arguments is a C++20 extension}}
g<3>(b);
// cxx98-17-error@-1 {{use of function template name with no prior declaration in function call with explicit template arguments is a C++20 extension}}
A::f<3>(b);
// expected-error@-1 {{no matching function for call to 'f'}}
// expected-note@#cwg241-A-f {{candidate function template not viable: requires 0 arguments, but 1 was provided}}
A::g<3>(b);
C::f<3>(b);
// expected-error@-1 {{no matching function for call to 'f'}}
// expected-note@#cwg241-C-f {{candidate template ignored: invalid explicitly-specified argument for template parameter 'T'}}
C::g<3>(b);
// expected-error@-1 {{no matching function for call to 'g'}}
// expected-note@#cwg241-C-g {{candidate template ignored: invalid explicitly-specified argument for template parameter 'T'}}
using C::f;
using C::g;
f<3>(b);
// expected-error@-1 {{no matching function for call to 'f'}}
// expected-note@#cwg241-C-f {{candidate template ignored: invalid explicitly-specified argument for template parameter 'T'}}
// expected-note@#cwg241-A-f {{candidate function template not viable: requires 0 arguments, but 1 was provided}}
g<3>(b);
}
}
namespace cwg243 { // cwg243: yes
struct B;
struct A {
A(B); // #cwg243-A
};
struct B {
operator A() = delete; // #cwg243-B
// cxx98-error@-1 {{deleted function definitions are a C++11 extension}}
} b;
A a1(b);
A a2 = b;
// expected-error@-1 {{conversion from 'struct B' to 'A' is ambiguous}}
// expected-note@#cwg243-A {{candidate constructor}}
// expected-note@#cwg243-B {{candidate function has been explicitly deleted}}
}
namespace cwg244 { // cwg244: 11
// NB: this test is reused by cwg399
struct B {}; // #cwg244-B
struct D : B {};
D D_object;
typedef B B_alias;
B* B_ptr = &D_object;
void f() {
D_object.~B();
// expected-error@-1 {{destructor type 'cwg244::B' in object destruction expression does not match the type 'D' of the object being destroyed}}
// expected-note@#cwg244-B {{type 'cwg244::B' found by destructor name lookup}}
D_object.B::~B();
D_object.D::~B(); // FIXME: Missing diagnostic for this.
B_ptr->~B();
B_ptr->~B_alias();
B_ptr->B_alias::~B();
B_ptr->B_alias::~B_alias();
B_ptr->cwg244::~B();
// expected-error@-1 {{no member named '~B' in namespace 'cwg244'}}
B_ptr->cwg244::~B_alias();
// expected-error@-1 {{no member named '~B' in namespace 'cwg244'}}
}
template<typename T, typename U>
void f(T *B_ptr, U D_object) {
D_object.~B(); // FIXME: Missing diagnostic for this.
D_object.B::~B();
D_object.D::~B(); // FIXME: Missing diagnostic for this.
B_ptr->~B();
B_ptr->~B_alias();
B_ptr->B_alias::~B();
B_ptr->B_alias::~B_alias();
B_ptr->cwg244::~B();
// expected-error@-1 {{'cwg244' does not refer to a type name in pseudo-destructor expression; expected the name of type 'T'}}
B_ptr->cwg244::~B_alias();
// expected-error@-1 {{'cwg244' does not refer to a type name in pseudo-destructor expression; expected the name of type 'T'}}
}
template void f<B, D>(B*, D);
namespace N {
template<typename T> struct E {};
typedef E<int> F;
}
void g(N::F f) {
typedef N::F G; // #cwg244-G
f.~G();
f.G::~E();
// expected-error@-1 {{ISO C++ requires the name after '::~' to be found in the same scope as the name before '::~'}}
f.G::~F();
// expected-error@-1 {{undeclared identifier 'F' in destructor name}}
f.G::~G();
// This is technically ill-formed; E is looked up in 'N::' and names the
// class template, not the injected-class-name of the class. But that's
// probably a bug in the standard.
f.N::F::~E();
// expected-error@-1 {{ISO C++ requires the name after '::~' to be found in the same scope as the name before '::~'}}
// This is valid; we look up the second F in the same scope in which we
// found the first one, that is, 'N::'.
f.N::F::~F();
// This is technically ill-formed; G is looked up in 'N::' and is not found.
// Rejecting this seems correct, but most compilers accept, so we do also.
f.N::F::~G();
// expected-error@-1 {{qualified destructor name only found in lexical scope; omit the qualifier to find this type name by unqualified lookup}}
// expected-note@#cwg244-G {{type 'G' (aka 'E<int>') found by destructor name lookup}}
}
// Bizarrely, compilers perform lookup in the scope for qualified destructor
// names, if the nested-name-specifier is non-dependent. Ensure we diagnose
// this.
namespace QualifiedLookupInScope {
namespace N {
template <typename> struct S { struct Inner {}; };
}
template <typename U> void f(typename N::S<U>::Inner *p) {
typedef typename N::S<U>::Inner T;
p->::cwg244::QualifiedLookupInScope::N::S<U>::Inner::~T();
// expected-error@-1 {{no type named 'T' in 'cwg244::QualifiedLookupInScope::N::S<int>'}}
// expected-note@#cwg244-f {{in instantiation of function template specialization 'cwg244::QualifiedLookupInScope::f<int>' requested here}}
}
template void f<int>(N::S<int>::Inner *); // #cwg244-f
template <typename U> void g(U *p) {
typedef U T;
p->T::~T();
p->U::~T();
p->::cwg244::QualifiedLookupInScope::N::S<int>::Inner::~T();
// expected-error@-1 {{'T' does not refer to a type name in pseudo-destructor expression; expected the name of type 'U'}}
}
template void g(N::S<int>::Inner *);
}
}
namespace cwg245 { // cwg245: yes
struct S {
enum E {}; // #cwg245-E
class E *p;
// expected-error@-1 {{use of 'E' with tag type that does not match previous declaration}}
// expected-note@#cwg245-E {{previous use is here}}
};
}
namespace cwg246 { // cwg246: 3.2
struct S {
S() try { // #cwg246-try
throw 0;
X: ;
} catch (int) {
goto X;
// expected-error@-1 {{cannot jump from this goto statement to its label}}
// expected-note@#cwg246-try {{jump bypasses initialization of try block}}
}
};
}
namespace cwg247 { // cwg247: yes
struct A {};
struct B : A {
void f();
void f(int);
};
void (A::*f)() = (void (A::*)())&B::f;
struct C {
void f();
void f(int);
};
struct D : C {};
void (C::*g)() = &D::f;
void (D::*h)() = &D::f;
struct E {
void f();
};
struct F : E {
using E::f;
void f(int);
};
void (F::*i)() = &F::f;
}
namespace cwg248 { // cwg248: sup P1949
int \u040d\u040e = 0;
}
namespace cwg249 { // cwg249: yes
template<typename T> struct X { void f(); };
template<typename T> void X<T>::f() {}
}
namespace cwg250 { // cwg250: yes
typedef void (*FPtr)(double x[]);
template<int I> void f(double x[]);
FPtr fp = &f<3>;
template<int I = 3> void g(double x[]);
// cxx98-error@-1 {{default template arguments for a function template are a C++11 extension}}
FPtr gp = &g<>;
}
namespace cwg252 { // cwg252: 3.1
struct A {
void operator delete(void*); // #cwg252-A
};
struct B {
void operator delete(void*); // #cwg252-B
};
struct C : A, B {
virtual ~C();
};
C::~C() {}
// expected-error@-1 {{member 'operator delete' found in multiple base classes of different types}}
// expected-note@#cwg252-A {{member found by ambiguous name lookup}}
// expected-note@#cwg252-B {{member found by ambiguous name lookup}}
struct D {
void operator delete(void*, int); // #cwg252-D
virtual ~D();
};
D::~D() {}
// expected-error@-1 {{no suitable member 'operator delete' in 'D'}}
// expected-note@#cwg252-D {{member 'operator delete' declared here}}
struct E {
void operator delete(void*, int);
void operator delete(void*) = delete; // #cwg252-E
// cxx98-error@-1 {{deleted function definitions are a C++11 extension}}
virtual ~E();
};
E::~E() {}
// expected-error@-1 {{attempt to use a deleted function}}
// expected-note@#cwg252-E {{'operator delete' has been explicitly marked deleted here}}
struct F {
// If both functions are available, the first one is a placement delete.
void operator delete(void*, size_t);
void operator delete(void*) = delete; // #cwg252-F
// cxx98-error@-1 {{deleted function definitions are a C++11 extension}}
virtual ~F();
};
F::~F() {}
// expected-error@-1 {{attempt to use a deleted function}}
// expected-note@#cwg252-F {{'operator delete' has been explicitly marked deleted here}}
struct G {
void operator delete(void*, size_t);
virtual ~G();
};
G::~G() {}
}
namespace cwg254 { // cwg254: 2.9
template<typename T> struct A {
typedef typename T::type type; // ok even if this is a typedef-name, because
// it's not an elaborated-type-specifier
typedef struct T::type foo;
// expected-error@-1 {{typedef 'type' cannot be referenced with the 'struct' specifier}}
// expected-note@#cwg254-instantiation {{in instantiation of template class 'cwg254::A<cwg254::C>' requested here}}
// expected-note@#cwg254-C {{declared here}}
};
struct B { struct type {}; };
struct C { typedef struct {} type; }; // #cwg254-C
A<B>::type n;
A<C>::type n; // #cwg254-instantiation
}
namespace cwg255 { // cwg255: yes
struct S {
void operator delete(void *){};
void operator delete(void *, int){};
};
void f(S *p) { delete p; }
} // namespace cwg255
// cwg256: dup 624
namespace cwg257 { // cwg257: 3.4
struct A { A(int); }; // #cwg257-A
struct B : virtual A {
B() {}
virtual void f() = 0;
};
struct C : B {
C() {}
};
struct D : B {
D() {}
// expected-error@-1 {{constructor for 'cwg257::D' must explicitly initialize the base class 'A' which does not have a default constructor}}
// expected-note@#cwg257-A {{'cwg257::A' declared here}}
void f();
};
}
namespace cwg258 { // cwg258: 2.8
struct A {
void f(const int);
template<typename> void g(int);
float &h() const;
};
struct B : A {
using A::f;
using A::g;
using A::h;
int &f(int);
template<int> int &g(int); // #cwg258-B-g
int &h();
} b;
int &w = b.f(0);
int &x = b.g<int>(0);
// expected-error@-1 {{no matching member function for call to 'g'}}
// expected-note@#cwg258-B-g {{candidate template ignored: invalid explicitly-specified argument for 1st template parameter}}
int &y = b.h();
float &z = const_cast<const B&>(b).h();
struct C {
virtual void f(const int) = 0;
};
struct D : C {
void f(int);
} d;
struct E {
virtual void f() = 0; // #cwg258-E-f
};
struct F : E {
void f() const {}
} f;
// expected-error@-1 {{variable type 'struct F' is an abstract class}}
// expected-note@#cwg258-E-f {{unimplemented pure virtual method 'f' in 'F'}}
}
namespace cwg259 { // cwg259: 4
template<typename T> struct A {};
template struct A<int>; // #cwg259-A-int
template struct A<int>;
// expected-error@-1 {{duplicate explicit instantiation of 'A<int>'}}
// expected-note@#cwg259-A-int {{previous explicit instantiation is here}}
template<> struct A<float>; // #cwg259-A-float
template struct A<float>;
// expected-warning@-1 {{explicit instantiation of 'A<float>' that occurs after an explicit specialization has no effect}}
// expected-note@#cwg259-A-float {{previous template specialization is here}}
template struct A<char>; // #cwg259-A-char
template<> struct A<char>;
// expected-error@-1 {{explicit specialization of 'cwg259::A<char>' after instantiation}}
// expected-note@#cwg259-A-char {{explicit instantiation first required here}}
template<> struct A<double>;
template<> struct A<double>;
template<> struct A<double> {}; // #cwg259-A-double
template<> struct A<double> {};
// expected-error@-1 {{redefinition of 'A<double>'}}
// expected-note@#cwg259-A-double {{previous definition is here}}
template<typename T> struct B; // #cwg259-B
template struct B<int>;
// expected-error@-1 {{explicit instantiation of undefined template 'cwg259::B<int>'}}
// expected-note@#cwg259-B {{template is declared here}}
template<> struct B<float>; // #cwg259-B-float
template struct B<float>;
// expected-warning@-1 {{explicit instantiation of 'B<float>' that occurs after an explicit specialization has no effect}}
// expected-note@#cwg259-B-float {{previous template specialization is here}}
}
// FIXME: When cwg260 is resolved, also add tests for CWG507.
namespace cwg261 { // cwg261: no
#pragma clang diagnostic push
#pragma clang diagnostic warning "-Wused-but-marked-unused"
// FIXME: This is ill-formed, with a diagnostic required, because operator new
// and operator delete are inline and odr-used, but not defined in this
// translation unit.
// We're also missing the -Wused-but-marked-unused diagnostic here.
struct A {
inline void *operator new(size_t) __attribute__((unused));
inline void operator delete(void*) __attribute__((unused));
A() {}
};
// FIXME: This is ill-formed, with a required diagnostic, for the same
// reason.
struct B {
inline void operator delete(void*) __attribute__((unused));
~B() {}
};
struct C {
inline void operator delete(void*) __attribute__((unused));
virtual ~C() {}
// expected-warning@-1 {{'operator delete' was marked unused but was used}}
};
struct D {
inline void operator delete(void*) __attribute__((unused));
};
void h() { C::operator delete(0); }
// expected-warning@-1 {{'operator delete' was marked unused but was used}}
#pragma clang diagnostic pop
}
namespace cwg262 { // cwg262: yes
int f(int = 0, ...);
int k = f();
int l = f(0);
int m = f(0, 0);
}
namespace cwg263 { // cwg263: 3.3
struct X {};
struct Y {
#if __cplusplus < 201103L
friend X::X() throw();
friend X::~X() throw();
#elif __cplusplus <= 201703L
friend constexpr X::X() noexcept;
friend X::~X();
#else
friend constexpr X::X() noexcept;
friend constexpr X::~X();
#endif
Y::Y();
// expected-error@-1 {{extra qualification on member 'Y'}}
Y::~Y();
// expected-error@-1 {{extra qualification on member '~Y'}}
};
}
// cwg265: dup 353
// cwg266: na
// cwg269: na
// cwg270: na
namespace cwg272 { // cwg272: yes
struct X {
void f() {
this->~X();
X::~X();
~X();
// expected-error@-1 {{invalid argument type 'X' to unary expression}}
}
};
}
#include <stdarg.h>
#include <stddef.h>
namespace cwg273 { // cwg273: yes
struct A {
int n;
};
void operator&(A);
void f(A a, ...) {
offsetof(A, n);
va_list val;
va_start(val, a);
va_end(val);
}
}
// cwg274: na
namespace cwg275 { // cwg275: no
namespace N {
template <class T> void f(T) {} // #cwg275-N-f
template <class T> void g(T) {} // #cwg275-N-g
template <> void f(int);
template <> void f(char);
template <> void f(double);
template <> void g(char);
}
using namespace N;
namespace M {
template <> void N::f(char) {}
// expected-error@-1 {{cannot define or redeclare 'f' here because namespace 'M' does not enclose namespace 'N'}}
template <class T> void g(T) {}
template <> void g(char) {}
// FIXME: this should be rejected in c++98 too
template void f(long);
// since-cxx11-error@-1 {{explicit instantiation of 'cwg275::N::f' must occur in namespace 'N'}}
// since-cxx11-note@#cwg275-N-f {{explicit instantiation refers here}}
// FIXME: this should be rejected in c++98 too
template void N::f(unsigned long);
// since-cxx11-error@-1 {{explicit instantiation of 'f' not in a namespace enclosing 'N'}}
// since-cxx11-note@#cwg275-N-f {{explicit instantiation refers here}}
template void h(long);
// expected-error@-1 {{explicit instantiation of 'h' does not refer to a function template, variable template, member function, member class, or static data member}}
template <> void f(double) {}
// expected-error@-1 {{no function template matches function template specialization 'f'}}
}
template <class T> void g(T) {} // #cwg275-g
template <> void N::f(char) {}
template <> void f(int) {}
// expected-error@-1 {{no function template matches function template specialization 'f'}}
// FIXME: this should be rejected in c++98 too
template void f(short);
// since-cxx11-error@-1 {{explicit instantiation of 'cwg275::N::f' must occur in namespace 'N'}}
// since-cxx11-note@#cwg275-N-f {{explicit instantiation refers here}}
template void N::f(unsigned short);
// FIXME: this should probably be valid. the wording from the issue
// doesn't clarify this, but it follows from the usual rules.
template void g(int);
// expected-error@-1 {{partial ordering for explicit instantiation of 'g' is ambiguous}}
// expected-note@#cwg275-g {{explicit instantiation candidate function 'cwg275::g<int>' template here [with T = int]}}
// expected-note@#cwg275-N-g {{explicit instantiation candidate function 'cwg275::N::g<int>' template here [with T = int]}}
// FIXME: likewise, this should also be valid.
template<typename T> void f(T) {} // #cwg275-f
template void f(short);
// expected-error@-1 {{partial ordering for explicit instantiation of 'f' is ambiguous}}
// expected-note@#cwg275-f {{explicit instantiation candidate function 'cwg275::f<short>' template here [with T = short]}}
// expected-note@#cwg275-N-f {{explicit instantiation candidate function 'cwg275::N::f<short>' template here [with T = short]}}
}
// cwg276: na
namespace cwg277 { // cwg277: 3.1
typedef int *intp;
int *p = intp();
static_assert(__enable_constant_folding(!intp()), "");
}
namespace cwg280 { // cwg280: 2.9
typedef void f0();
typedef void f1(int);
typedef void f2(int, int);
typedef void f3(int, int, int);
struct A {
operator f1*(); // #cwg280-A-f1
operator f2*();
};
struct B {
operator f0*(); // #cwg280-B-f0
private:
operator f3*(); // #cwg280-B-f3
};
struct C {
operator f0*(); // #cwg280-C-f0
operator f1*(); // #cwg280-C-f1
operator f2*(); // #cwg280-C-f2
operator f3*(); // #cwg280-C-f3
};
struct D : private A, B { // #cwg280-D
operator f2*(); // #cwg280-D-f2
} d;
struct E : C, D {} e;
void g() {
d(); // ok, public
d(0);
// expected-error@-1 {{'operator void (*)(int)' is a private member of 'cwg280::A'}}
// expected-note@#cwg280-D {{constrained by private inheritance here}}
// expected-note@#cwg280-A-f1 {{member is declared here}}
d(0, 0); // ok, suppressed by member in D
d(0, 0, 0);
// expected-error@-1 {{'operator void (*)(int, int, int)' is a private member of 'cwg280::B'}}
// expected-note@#cwg280-B-f3 {{declared private here}}
e();
// expected-error@-1 {{call to object of type 'struct E' is ambiguous}}
// expected-note@#cwg280-B-f0 {{conversion candidate of type 'void (*)()'}}
// expected-note@#cwg280-C-f0 {{conversion candidate of type 'void (*)()'}}
e(0);
// expected-error@-1 {{call to object of type 'struct E' is ambiguous}}
// expected-note@#cwg280-A-f1 {{conversion candidate of type 'void (*)(int)'}}
// expected-note@#cwg280-C-f1 {{conversion candidate of type 'void (*)(int)'}}
e(0, 0);
// expected-error@-1 {{call to object of type 'struct E' is ambiguous}}
// expected-note@#cwg280-C-f2 {{conversion candidate of type 'void (*)(int, int)'}}
// expected-note@#cwg280-D-f2 {{conversion candidate of type 'void (*)(int, int)'}}
e(0, 0, 0);
// expected-error@-1 {{call to object of type 'struct E' is ambiguous}}
// expected-note@#cwg280-B-f3 {{conversion candidate of type 'void (*)(int, int, int)'}}
// expected-note@#cwg280-C-f3 {{conversion candidate of type 'void (*)(int, int, int)'}}
}
}
namespace cwg281 { // cwg281: no
void a();
inline void b();
void d();
inline void e();
struct S {
friend inline void a(); // FIXME: ill-formed
friend inline void b();
friend inline void c(); // FIXME: ill-formed
friend inline void d() {}
friend inline void e() {}
friend inline void f() {}
};
}
namespace cwg283 { // cwg283: yes
template<typename T> // #cwg283-template
struct S {
friend class T;
// expected-error@-1 {{declaration of 'T' shadows template parameter}}
// expected-note@#cwg283-template {{template parameter is declared here}}
class T;
// expected-error@-1 {{declaration of 'T' shadows template parameter}}
// expected-note@#cwg283-template {{template parameter is declared here}}
};
}
namespace cwg284 { // cwg284: no
namespace A {
struct X;
enum Y {};
class Z {};
}
namespace B {
struct W;
using A::X;
using A::Y;
using A::Z;
}
struct B::V {};
// expected-error@-1 {{no struct named 'V' in namespace 'cwg284::B'}}
struct B::W {};
struct B::X {}; // FIXME: ill-formed
enum B::Y e; // ok per cwg417
class B::Z z; // ok per cwg417
struct C {
struct X;
enum Y {};
class Z {};
};
struct D : C {
struct W;
using C::X;
using C::Y;
using C::Z;
};
struct D::V {};
// expected-error@-1 {{no struct named 'V' in 'cwg284::D'}}
struct D::W {};
struct D::X {}; // FIXME: ill-formed
enum D::Y e2; // ok per cwg417
class D::Z z2; // ok per cwg417
}
namespace cwg285 { // cwg285: yes
template<typename T> void f(T, int); // #cwg285-f-T-int
template<typename T> void f(int, T); // #cwg285-f-int-T
template<> void f<int>(int, int) {}
// expected-error@-1 {{function template specialization 'f' ambiguously refers to more than one function template; explicitly specify additional template arguments to identify a particular function template}}
// expected-note@#cwg285-f-int-T {{function template 'cwg285::f<int>' matches specialization [with T = int]}}
// expected-note@#cwg285-f-T-int {{function template 'cwg285::f<int>' matches specialization [with T = int]}}
}
namespace cwg286 { // cwg286: 2.8
template<class T> struct A {
class C {
template<class T2> struct B {}; // #cwg286-B
};
};
template<class T>
template<class T2>
struct A<T>::C::B<T2*> { };
A<short>::C::B<int*> absip;
// expected-error@-1 {{'B' is a private member of 'cwg286::A<short>::C'}}
// expected-note@#cwg286-B {{implicitly declared private here}}
}
// cwg288: na
namespace cwg289 { // cwg289: yes
struct A; // #cwg289-A
struct B : A {};
// expected-error@-1 {{base class has incomplete type}}
// expected-note@#cwg289-A {{forward declaration of 'cwg289::A'}}
template<typename T> struct C { typename T::error error; };
// expected-error@-1 {{type 'int' cannot be used prior to '::' because it has no members}}
// expected-note@#cwg289-C-int {{in instantiation of template class 'cwg289::C<int>' requested here}}
struct D : C<int> {}; // #cwg289-C-int
}
// cwg290: na
// cwg291: dup 391
// cwg292 is in cwg292.cpp
namespace cwg294 { // cwg294: no
void f() throw(int);
// since-cxx17-error@-1 {{ISO C++17 does not allow dynamic exception specifications}}
// since-cxx17-note@-2 {{use 'noexcept(false)' instead}}
int main() {
(void)static_cast<void (*)() throw()>(f); // FIXME: ill-formed in C++14 and before
// FIXME: since-cxx17-error@-1 {{static_cast from 'void (*)() throw(int)' to 'void (*)() throw()' is not allowed}}
//
// Irony: the above is valid in C++17 and beyond, but that's exactly when
// we reject it. In C++14 and before, this is ill-formed because an
// exception-specification is not permitted in a type-id. In C++17, this is
// valid because it's the inverse of a standard conversion sequence
// containing a function pointer conversion. (Well, it's actually not valid
// yet, as a static_cast is not permitted to reverse a function pointer
// conversion, but that is being changed by core issue).
(void)static_cast<void (*)() throw(int)>(f); // FIXME: ill-formed in C++14 and before
// since-cxx17-error@-1 {{ISO C++17 does not allow dynamic exception specifications}}
// since-cxx17-note@-2 {{use 'noexcept(false)' instead}}
void (*p)() throw() = f;
// cxx98-14-error@-1 {{target exception specification is not superset of source}}
// since-cxx17-error@-2 {{cannot initialize a variable of type 'void (*)() throw()' with an lvalue of type 'void () throw(int)': different exception specifications}}
void (*q)() throw(int) = f;
// since-cxx17-error@-1 {{ISO C++17 does not allow dynamic exception specifications}}
// since-cxx17-note@-2 {{use 'noexcept(false)' instead}}
}
}
namespace cwg295 { // cwg295: 3.7
typedef int f();
const f g;
// expected-warning@-1 {{'const' qualifier on function type 'f' (aka 'int ()') has no effect}}
f &r = g;
template<typename T> struct X {
const T &f;
};
X<f> x = {g};
typedef int U();
typedef const U U;
// expected-warning@-1 {{'const' qualifier on function type 'U' (aka 'int ()') has no effect}}
typedef int (*V)();
typedef volatile U *V;
// expected-warning@-1 {{'volatile' qualifier on function type 'U' (aka 'int ()') has no effect}}
}
namespace cwg296 { // cwg296: yes
struct A {
static operator int() { return 0; }
// expected-error@-1 {{conversion function must be a non-static member function}}
};
}
namespace cwg298 { // cwg298: 3.1
struct A {
typedef int type;
A();
~A();
};
typedef A B; // #cwg298-B
typedef const A C; // #cwg298-C
A::type i1;
B::type i2;
C::type i3;
struct A a;
struct B b;
// expected-error@-1 {{typedef 'B' cannot be referenced with the 'struct' specifier}}
// expected-note@#cwg298-B {{declared here}}
struct C c;
// expected-error@-1 {{typedef 'C' cannot be referenced with the 'struct' specifier}}
// expected-note@#cwg298-C {{declared here}}
B::B() {}
// expected-error@-1 {{a type specifier is required for all declarations}}
B::A() {} // ok
C::~C() {}
// expected-error@-1 {{destructor cannot be declared using a typedef 'C' (aka 'const cwg298::A') of the class name}}
typedef struct D E; // #cwg298-E
struct E {};
// expected-error@-1 {{definition of type 'E' conflicts with typedef of the same name}}
// expected-note@#cwg298-E {{'E' declared here}}
struct F {
~F();
};
typedef const F G;
G::~F() {} // ok
}
namespace cwg299 { // cwg299: 2.8 c++11
struct S {
operator int();
};
struct T {
operator int(); // #cwg299-int
operator unsigned short(); // #cwg299-ushort
};
// FIXME: should this apply to c++98 mode?
int *p = new int[S()];
// cxx98-error@-1 {{implicit conversion from array size expression of type 'S' to integral type 'int' is a C++11 extension}}
int *q = new int[T()]; // #cwg299-q
// cxx98-11-error@#cwg299-q {{ambiguous conversion of array size expression of type 'T' to an integral or enumeration type}}
// cxx98-11-note@#cwg299-int {{conversion to integral type 'int' declared here}}
// cxx98-11-note@#cwg299-ushort {{conversion to integral type 'unsigned short' declared here}}
// since-cxx14-error-re@#cwg299-q {{{{conversion from 'T' to 'unsigned (long long|long|int)' is ambiguous}}}}
// since-cxx14-note@#cwg299-int {{candidate function}}
// since-cxx14-note@#cwg299-ushort {{candidate function}}
}
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