// RUN: %clang_cc1 -std=c++23 -verify=expected,cxx20-23,cxx23,since-cxx11,since-cxx17,since-cxx23 -triple %itanium_abi_triple %s -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++20 -verify=expected,cxx98-20,cxx20-23,since-cxx11,since-cxx17 -triple %itanium_abi_triple %s -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++17 -verify=expected,cxx98-17,cxx98-20,since-cxx11,since-cxx17 -triple %itanium_abi_triple %s -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++14 -verify=expected,cxx98-14,cxx98-17,cxx98-20,cxx11-14,since-cxx11 -triple %itanium_abi_triple %s -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++11 -verify=expected,cxx98-14,cxx98-17,cxx98-20,cxx11-14,since-cxx11 -triple %itanium_abi_triple %s -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++98 -verify=expected,cxx98-14,cxx98-17,cxx98-20,cxx98 -triple %itanium_abi_triple %s -fexceptions -fcxx-exceptions -pedantic-errors
#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 cwg300 { // cwg300: yes
template<typename R, typename A> void f(R (&)(A)) {}
int g(int);
void h() { f(g); }
}
namespace cwg301 { // cwg301: 3.5
// see also cwg38
struct S;
template<typename T> void operator+(T, T);
void operator-(S, S);
void f() {
bool a = (void(*)(S, S))operator+<S> < (void(*)(S, S))operator+<S>;
// expected-warning@-1 {{ordered comparison of function pointers ('void (*)(S, S)' and 'void (*)(S, S)')}}
bool b = (void(*)(S, S))operator- < (void(*)(S, S))operator-;
// cxx98-17-warning@-1 {{ordered comparison of function pointers ('void (*)(S, S)' and 'void (*)(S, S)')}}
// cxx20-23-error@-2 {{expected '>'}}
// cxx20-23-note@-3 {{to match this '<'}}
bool c = (void(*)(S, S))operator+ < (void(*)(S, S))operator-;
// expected-error@-1 {{expected '>'}}
// expected-note@-2 {{to match this '<'}}
}
template<typename T> void f() {
// FIXME: We are emitting a lot of bogus diagnostics here.
typename T::template operator+<int> a;
// expected-error@-1 {{typename specifier refers to a non-type template}}
// expected-error@-2 {{'template' keyword not permitted here}}
// expected-error@-3 {{a type specifier is required for all declarations}}
// expected-error@-4 {{'operator+' cannot be the name of a variable or data member}}
// expected-error@-5 {{expected ';' at end of declaration}}
// FIXME: This shouldn't say (null).
class T::template operator+<int> b;
// expected-error@-1 {{identifier followed by '<' indicates a class template specialization but (null) refers to a function template}}
enum T::template operator+<int> c;
// expected-error@-1 {{expected identifier}}
enum T::template operator+<int>::E d;
// expected-error@-1 {{qualified name refers into a specialization of function template 'T::template operator +'}}
// expected-error@-2 {{ISO C++ forbids forward references to 'enum' types}}
enum T::template X<int>::E e;
T::template operator+<int>::foobar();
// expected-error@-1 {{qualified name refers into a specialization of function template 'T::template operator +'}}
T::template operator+<int>(0); // ok
}
// FIXME: We are emitting a bunch of bogus diagnostics for the next 3 lines.
// All of them do a bad job at explaining that 'class' is not allowed here.
template<typename T> class operator&<T*> {};
// expected-error@-1 {{declaration of anonymous class must be a definition}}
// expected-error@-2 {{declaration does not declare anything}}
template<typename T> class T::operator& {};
// expected-error@-1 {{expected identifier}}
// expected-error@-2 {{declaration of anonymous class must be a definition}}
// expected-error@-3 {{declaration does not declare anything}}
template<typename T> class S::operator&<T*> {};
// expected-error@-1 {{expected identifier}}
// expected-error@-2 {{declaration of anonymous class must be a definition}}
// expected-error@-3 {{declaration does not declare anything}}
}
namespace cwg302 { // cwg302: 3.0
struct A { A(); ~A(); };
#if __cplusplus < 201103L
struct B {
// expected-error@-1 {{implicit default constructor for 'cwg302::B' must explicitly initialize the const member 'n'}}
// expected-note@#cwg302-b {{in implicit default constructor for 'cwg302::B' first required here}}
// expected-note@#cwg302-B-n {{declared here}}
const int n; // #cwg302-B-n
A a;
} b = B(); // #cwg302-b
// Trivial default constructor C::C() is not called here.
struct C {
const int n;
} c = C();
#else
struct B {
const int n; // #cwg302-B-n
A a;
} b = B();
// expected-error@-1 {{call to implicitly-deleted default constructor of 'B'}}
// expected-note@#cwg302-B-n {{default constructor of 'B' is implicitly deleted because field 'n' of const-qualified type 'const int' would not be initialized}}
// C::C() is called here, because even though it's trivial, it's deleted.
struct C {
const int n; // #cwg302-C-n
} c = C();
// expected-error@-1 {{call to implicitly-deleted default constructor of 'C'}}
// expected-note@#cwg302-C-n {{default constructor of 'C' is implicitly deleted because field 'n' of const-qualified type 'const int' would not be initialized}}
struct D {
const int n = 0;
} d = D();
#endif
}
// cwg303: na
namespace cwg304 { // cwg304: 2.9
typedef int &a;
int n = a();
// expected-error@-1 {{reference to type 'int' requires an initializer}}
struct S { int &b; }; // #cwg304-S
// cxx98-error@-1 {{reference to type 'int' requires an initializer}}
// cxx98-note@#cwg304-m {{in value-initialization of type 'S' here}}
int m = S().b; // #cwg304-m
// since-cxx11-error@-1 {{call to implicitly-deleted default constructor of 'S'}}
// since-cxx11-note@#cwg304-S {{default constructor of 'S' is implicitly deleted because field 'b' of reference type 'int &' would not be initialized}}
}
namespace cwg305 { // cwg305: no
struct A {
typedef A C;
};
void f(A *a) {
struct A {};
a->~A();
a->~C();
}
typedef A B;
void g(B *b) {
b->~B();
b->~C();
}
void h(B *b) {
struct B {}; // #cwg305-h-B
b->~B();
// expected-error@-1 {{destructor type 'B' in object destruction expression does not match the type 'B' (aka 'cwg305::A') of the object being destroyed}}
// expected-note@#cwg305-h-B {{type 'B' found by destructor name lookup}}
}
template<typename T> struct X {};
void i(X<int>* x) {
struct X {};
x->~X<int>();
x->~X();
x->~X<char>();
// expected-error@-1 {{no member named '~X' in 'cwg305::X<int>'}}
}
#if __cplusplus >= 201103L
struct Y {
template<typename T> using T1 = Y;
};
template<typename T> using T2 = Y;
void j(Y *y) {
y->~T1<int>();
y->~T2<int>();
}
struct Z {
template<typename T> using T2 = T;
};
void k(Z *z) {
z->~T1<int>();
// expected-error@-1 {{no member named 'T1' in 'cwg305::Z'}}
z->~T2<int>();
// expected-error@-1 {{no member named '~int' in 'cwg305::Z'}}
z->~T2<Z>();
}
// FIXME: This is valid.
namespace Q {
template<typename A> struct R {};
}
template<typename A> using R = Q::R<int>;
void qr(Q::R<int> x) { x.~R<char>(); }
// expected-error@-1 {{no member named '~R' in 'cwg305::Q::R<int>'}}
#endif
}
namespace cwg306 { // cwg306: dup 39
struct A { struct B {}; };
struct C { typedef A::B B; };
struct D : A, A::B, C {};
D::B b;
struct X {}; // #cwg306-X
template<typename T> struct Y { typedef T X; }; // #cwg306-typedef-X
template<typename T> struct Z : X, Y<T> {};
Z<X>::X zx;
Z<const X>::X zcx;
// expected-error@-1 {{member 'X' found in multiple base classes of different types}}
// expected-note@#cwg306-X {{member type 'cwg306::X' found}}
// expected-note@#cwg306-typedef-X {{member type 'const cwg306::X' found}}
}
// cwg307: na
namespace cwg308 { // cwg308: 3.7
// This is mostly an ABI library issue.
struct A {};
struct B : A {};
struct C : A {};
struct D : B, C {};
void f() {
// NB: the warning here is correct despite being the opposite of the
// comments in the catch handlers. The "unreachable" comment is correct
// because there is an ambiguous base path to A from the D that is thrown.
// The warnings generated are also correct because the handlers handle
// const B& and const A& and we don't check to see if other derived classes
// exist that would cause an ambiguous base path. We issue the diagnostic
// despite the potential for a false positive because users are not
// expected to have ambiguous base paths all that often, so the false
// positive rate should be acceptably low.
try {
throw D();
} catch (const A&) { // #cwg308-catch-A
// unreachable
} catch (const B&) {
// expected-warning@-1 {{exception of type 'const B &' will be caught by earlier handler}}
// expected-note@#cwg308-catch-A {{for type 'const A &'}}
// get here instead
}
}
}
// cwg309: dup 485
namespace cwg311 { // cwg311: 3.0
namespace X { namespace Y {} }
namespace X::Y {}
// cxx98-14-error@-1 {{nested namespace definition is a C++17 extension; define each namespace separately}}
namespace X {
namespace X::Y {}
// cxx98-14-error@-1 {{nested namespace definition is a C++17 extension; define each namespace separately}}
}
// FIXME: The diagnostics here are not very good.
namespace ::cwg311::X {}
// expected-error@-1 {{expected identifier or '{'}}
// expected-warning@-2 {{extra qualification on member 'X'}}
// expected-error@-3 {{a type specifier is required for all declarations}}
// expected-error@-4 {{expected ';' after top level declarator}}
}
// cwg312: dup 616
namespace cwg313 { // cwg313: dup 299 c++11
struct A { operator int() const; };
// FIXME: should this be available in c++98 mode?
int *p = new int[A()];
// cxx98-error@-1 {{implicit conversion from array size expression of type 'A' to integral type 'int' is a C++11 extension}}
}
namespace cwg314 { // cwg314: no
// NB: dup 1710
template <typename T> struct A {
template <typename U> struct B {};
};
template <typename T> struct C : public A<T>::template B<T> {
C() : A<T>::template B<T>() {}
};
template <typename T> struct C2 : public A<T>::B<T> {
// expected-error@-1 {{use 'template' keyword to treat 'B' as a dependent template name}}
C2() : A<T>::B<T>() {}
// expected-error@-1 {{use 'template' keyword to treat 'B' as a dependent template name}}
};
} // namespace cwg314
// cwg315: na
// cwg316: sup 1004
namespace cwg317 { // cwg317: 3.5
void f() {} // #cwg317-f
inline void f();
// expected-error@-1 {{inline declaration of 'f' follows non-inline definition}}
// expected-note@#cwg317-f {{previous definition is here}}
int g();
int n = g();
inline int g() { return 0; }
int h();
int m = h();
int h() { return 0; } // #cwg317-h
inline int h();
// expected-error@-1 {{inline declaration of 'h' follows non-inline definition}}
// expected-note@#cwg317-h {{previous definition is here}}
}
namespace cwg318 { // cwg318: sup 1310
struct A {};
struct A::A a;
}
namespace cwg319 { // cwg319: no
// FIXME: dup cwg389
// FIXME: We don't have a diagnostic for a name with linkage
// having a type without linkage.
typedef struct {
int i;
} *ps;
extern "C" void f(ps);
void g(ps); // FIXME: ill-formed, type 'ps' has no linkage
static enum { e } a1;
enum { e2 } a2; // FIXME: ill-formed, enum type has no linkage
enum { n1 = 1u };
typedef int (*pa)[n1];
pa parr; // ok, type has linkage despite using 'n1'
template<typename> struct X {};
void f() {
struct A { int n; };
extern A a; // FIXME: ill-formed
X<A> xa;
// cxx98-error@-1 {{template argument uses local type 'A'}}
typedef A B;
extern B b; // FIXME: ill-formed
X<B> xb;
// cxx98-error@-1 {{template argument uses local type 'A'}}
const int n = 1;
typedef int (*C)[n];
extern C c; // ok
X<C> xc;
}
}
namespace cwg320 { // cwg320: yes
#if __cplusplus >= 201103L
struct X {
constexpr X() {}
constexpr X(const X &x) : copies(x.copies + 1) {}
unsigned copies = 0;
};
constexpr X f(X x) { return x; }
constexpr unsigned g(X x) { return x.copies; }
static_assert(f(X()).copies == g(X()) + 1, "expected one extra copy for return value");
#endif
}
namespace cwg321 { // cwg321: dup 557
namespace N {
template<int> struct A {
template<int> struct B;
};
template<> template<> struct A<0>::B<0>;
void f(A<0>::B<0>);
}
template<> template<> struct N::A<0>::B<0> {};
template<typename T> void g(T t) { f(t); }
template void g(N::A<0>::B<0>);
namespace N {
template<typename> struct I { friend bool operator==(const I&, const I&); };
}
N::I<int> i, j;
bool x = i == j;
}
namespace cwg322 { // cwg322: 2.8
struct A {
template<typename T> operator T&();
} a;
int &r = static_cast<int&>(a);
int &s = a;
}
// cwg323: sup 820
namespace cwg324 { // cwg324: 3.6
struct S { int n : 1; } s; // #cwg324-n
int &a = s.n;
// expected-error@-1 {{non-const reference cannot bind to bit-field 'n'}}
// expected-note@#cwg324-n {{bit-field is declared here}}
int *b = &s.n;
// expected-error@-1 {{address of bit-field requested}}
int &c = (s.n = 0);
// expected-error@-1 {{non-const reference cannot bind to bit-field 'n'}}
// expected-note@#cwg324-n {{bit-field is declared here}}
int *d = &(s.n = 0);
// expected-error@-1 {{address of bit-field requested}}
// FIXME: why don't we emit a note here, as for the rest of this type of diagnostic in this test?
int &e = true ? s.n : s.n;
// expected-error@-1 {{non-const reference cannot bind to bit-field}}
int *f = &(true ? s.n : s.n);
// expected-error@-1 {{address of bit-field requested}}
int &g = (void(), s.n);
// expected-error@-1 {{non-const reference cannot bind to bit-field 'n'}}
// expected-note@#cwg324-n {{bit-field is declared here}}
int *h = &(void(), s.n);
// expected-error@-1 {{address of bit-field requested}}
int *i = &++s.n;
// expected-error@-1 {{address of bit-field requested}}
}
namespace cwg326 { // cwg326: 3.1
struct S {};
static_assert(__is_trivially_constructible(S, const S&), "");
}
namespace cwg327 { // cwg327: dup 538
struct A;
class A {};
class B;
struct B {};
}
namespace cwg328 { // cwg328: yes
struct A; // #cwg328-A
struct B { A a; };
// expected-error@-1 {{field has incomplete type 'A'}}
// expected-note@#cwg328-A {{forward declaration of 'cwg328::A'}}
template<typename> struct C { A a; };
// expected-error@-1 {{field has incomplete type 'A'}}
// expected-note@#cwg328-A {{forward declaration of 'cwg328::A'}}
A *p = new A[0];
// expected-error@-1 {{allocation of incomplete type 'A'}}
// expected-note@#cwg328-A {{forward declaration of 'cwg328::A'}}
}
namespace cwg329 { // cwg329: 3.5
struct B {};
template<typename T> struct A : B {
friend void f(A a) { g(a); }
friend void h(A a) { g(a); }
// expected-error@-1 {{use of undeclared identifier 'g'}}
// expected-note@#cwg329-h-call {{in instantiation of member function 'cwg329::h' requested here}}
friend void i(B b) {} // #cwg329-i
// expected-error@-1 {{redefinition of 'i'}}
// expected-note@#cwg329-b {{in instantiation of template class 'cwg329::A<char>' requested here}}
// expected-note@#cwg329-i {{previous definition is here}}
};
A<int> a;
A<char> b; // #cwg329-b
void test() {
h(a); // #cwg329-h-call
}
}
namespace cwg330 { // cwg330: 7
// Conversions between P and Q will be allowed by P0388.
typedef int *(*P)[3];
typedef const int *const (*Q)[3];
typedef const int *Qinner[3];
typedef Qinner const *Q2; // same as Q, but 'const' written outside the array type
typedef const int *const (*R)[4];
typedef const int *const (*S)[];
typedef const int *(*T)[];
void f(P p, Q q, Q2 q2, R r, S s, T t) {
q = p; // ok
q2 = p; // ok
r = p;
// expected-error@-1 {{incompatible pointer types assigning to 'R' (aka 'const int *const (*)[4]') from 'P' (aka 'int *(*)[3]')}}
s = p;
// cxx98-17-error@-1 {{incompatible pointer types assigning to 'S' (aka 'const int *const (*)[]') from 'P' (aka 'int *(*)[3]')}} (fixed by p0388)
t = p;
// expected-error@-1 {{incompatible pointer types assigning to 'T' (aka 'const int *(*)[]') from 'P' (aka 'int *(*)[3]')}}
s = q;
// cxx98-17-error@-1 {{incompatible pointer types assigning to 'S' (aka 'const int *const (*)[]') from 'Q' (aka 'const int *const (*)[3]')}} (fixed by p0388)
s = q2;
// cxx98-17-error@-1 {{incompatible pointer types assigning to 'S' (aka 'const int *const (*)[]') from 'Q2' (aka 'const int *const (*)[3]')}} (fixed by p0388)
s = t; // ok, adding const
t = s;
// expected-error@-1 {{assigning to 'T' (aka 'const int *(*)[]') from 'S' (aka 'const int *const (*)[]') discards qualifiers}}
(void) const_cast<P>(q);
(void) const_cast<P>(q2);
(void) const_cast<Q>(p);
(void) const_cast<Q2>(p);
(void) const_cast<S>(p);
// expected-error@-1 {{const_cast from 'P' (aka 'int *(*)[3]') to 'S' (aka 'const int *const (*)[]') is not allowed}} (for now)
(void) const_cast<P>(s);
// expected-error@-1 {{const_cast from 'S' (aka 'const int *const (*)[]') to 'P' (aka 'int *(*)[3]') is not allowed}} (for now)
(void) const_cast<S>(q);
// expected-error@-1 {{const_cast from 'Q' (aka 'const int *const (*)[3]') to 'S' (aka 'const int *const (*)[]') is not allowed}}
(void) const_cast<S>(q2);
// expected-error@-1 {{const_cast from 'Q2' (aka 'const int *const (*)[3]') to 'S' (aka 'const int *const (*)[]') is not allowed}}
(void) const_cast<Q>(s);
// expected-error@-1 {{const_cast from 'S' (aka 'const int *const (*)[]') to 'Q' (aka 'const int *const (*)[3]') is not allowed}}
(void) const_cast<Q2>(s);
// expected-error@-1 {{const_cast from 'S' (aka 'const int *const (*)[]') to 'Q2' (aka 'const int *const (*)[3]') is not allowed}}
(void) const_cast<T>(s);
(void) const_cast<S>(t);
(void) const_cast<T>(q);
// expected-error@-1 {{const_cast from 'Q' (aka 'const int *const (*)[3]') to 'T' (aka 'const int *(*)[]') is not allowed}}
(void) const_cast<Q>(t);
// expected-error@-1 {{const_cast from 'T' (aka 'const int *(*)[]') to 'Q' (aka 'const int *const (*)[3]') is not allowed}}
(void) reinterpret_cast<P>(q);
// expected-error@-1 {{reinterpret_cast from 'Q' (aka 'const int *const (*)[3]') to 'P' (aka 'int *(*)[3]') casts away qualifiers}}
(void) reinterpret_cast<P>(q2);
// expected-error@-1 {{reinterpret_cast from 'Q2' (aka 'const int *const (*)[3]') to 'P' (aka 'int *(*)[3]') casts away qualifiers}}
(void) reinterpret_cast<Q>(p);
(void) reinterpret_cast<Q2>(p);
(void) reinterpret_cast<S>(p);
(void) reinterpret_cast<P>(s);
// expected-error@-1 {{reinterpret_cast from 'S' (aka 'const int *const (*)[]') to 'P' (aka 'int *(*)[3]') casts away qualifiers}}
(void) reinterpret_cast<S>(q);
(void) reinterpret_cast<S>(q2);
(void) reinterpret_cast<Q>(s);
(void) reinterpret_cast<Q2>(s);
(void) reinterpret_cast<T>(s);
// expected-error@-1 {{reinterpret_cast from 'S' (aka 'const int *const (*)[]') to 'T' (aka 'const int *(*)[]') casts away qualifiers}}
(void) reinterpret_cast<S>(t);
(void) reinterpret_cast<T>(q);
// expected-error@-1 {{reinterpret_cast from 'Q' (aka 'const int *const (*)[3]') to 'T' (aka 'const int *(*)[]') casts away qualifiers}}
(void) reinterpret_cast<Q>(t);
}
namespace swift_17882 {
typedef const char P[72];
typedef int *Q;
void f(P &pr, P *pp) {
(void) reinterpret_cast<const Q&>(pr);
(void) reinterpret_cast<const Q*>(pp);
}
struct X {};
typedef const volatile int A[1][2][3];
typedef int *const X::*volatile *B1;
typedef int *const X::* *B2;
typedef int *X::* volatile *B3;
typedef volatile int *(*const B4)[4];
void f(A *a) {
(void) reinterpret_cast<B1*>(a);
(void) reinterpret_cast<B2*>(a);
// expected-error@-1 {{ISO C++ does not allow reinterpret_cast from 'A *' (aka 'const volatile int (*)[1][2][3]') to 'B2 *' (aka 'int *const cwg330::swift_17882::X::***') because it casts away qualifiers, even though the source and destination types are unrelated}}
(void) reinterpret_cast<B3*>(a);
// expected-error@-1 {{ISO C++ does not allow reinterpret_cast from 'A *' (aka 'const volatile int (*)[1][2][3]') to 'B3 *' (aka 'int *cwg330::swift_17882::X::*volatile **') because it casts away qualifiers, even though the source and destination types are unrelated}}
(void) reinterpret_cast<B4*>(a);
}
}
}
namespace cwg331 { // cwg331: 11
struct A {
A(volatile A&); // #cwg331-A-ctor
};
const A a;
// expected-error@-1 {{no matching constructor for initialization of 'const A'}}
// expected-note@#cwg331-A-ctor {{candidate constructor not viable: requires 1 argument, but 0 were provided}}
const A b(a);
// expected-error@-1 {{no matching constructor for initialization of 'const A'}}
// expected-note@#cwg331-A-ctor {{candidate constructor not viable: 1st argument ('const A') would lose const qualifier}}
}
namespace cwg332 { // cwg332: dup 577
void f(volatile void);
// expected-error@-1 {{'void' as parameter must not have type qualifiers}}
// cxx20-23-warning@-2 {{volatile-qualified parameter type 'volatile void' is deprecated}}
void g(const void);
// expected-error@-1 {{'void' as parameter must not have type qualifiers}}
void h(int n, volatile void);
// expected-error@-1 {{'void' must be the first and only parameter if specified}}
// cxx20-23-warning@-2 {{volatile-qualified parameter type 'volatile void' is deprecated}}
}
namespace cwg333 { // cwg333: yes
int n = 0;
int f(int(n));
int g((int(n)));
int h = f(g);
}
namespace cwg334 { // cwg334: yes
template<typename T> void f() {
T x;
f((x, 123));
}
struct S {
friend S operator,(S, int);
friend void f(S);
};
template void f<S>();
}
// cwg335: sup 820
namespace cwg336 { // cwg336: yes
namespace Pre {
template<class T1> class A {
template<class T2> class B {
template<class T3> void mf1(T3);
void mf2();
};
};
template<> template<class X> class A<int>::B {}; // #cwg336-B
template<> template<> template<class T> void A<int>::B<double>::mf1(T t) {}
// expected-error@-1 {{out-of-line definition of 'mf1' does not match any declaration in 'cwg336::Pre::A<int>::B<double>'}}
// expected-note@#cwg336-B {{defined here}}
template<class Y> template<> void A<Y>::B<double>::mf2() {}
// expected-error@-1 {{nested name specifier 'A<Y>::B<double>::' for declaration does not refer into a class, class template or class template partial specialization}}
}
namespace Post {
template<class T1> class A {
template<class T2> class B {
template<class T3> void mf1(T3);
void mf2();
};
};
template<> template<class X> class A<int>::B {
template<class T> void mf1(T);
};
template<> template<> template<class T> void A<int>::B<double>::mf1(T t) {}
// FIXME: This diagnostic isn't very good.
template<class Y> template<> void A<Y>::B<double>::mf2() {}
// expected-error@-1 {{nested name specifier 'A<Y>::B<double>::' for declaration does not refer into a class, class template or class template partial specialization}}
}
}
namespace cwg337 { // cwg337: yes
template<typename T> void f(T (*)[1]);
template<typename T> int &f(...);
struct A { virtual ~A() = 0; };
int &r = f<A>(0);
// FIXME: The language rules here are completely broken. We cannot determine
// whether an incomplete type is abstract. See CWG1640, which will probably
// supersede this one and remove this rule.
struct B;
int &s = f<B>(0);
// expected-error@-1 {{non-const lvalue reference to type 'int' cannot bind to a temporary of type 'void'}}
struct B { virtual ~B() = 0; };
}
namespace cwg339 { // cwg339: 2.8
template <int I> struct A { static const int value = I; };
char xxx(int);
char (&xxx(float))[2];
template<class T> A<sizeof(xxx((T)0))> f(T) {} // #cwg339-f
void test() {
A<1> a = f(0);
A<2> b = f(0.0f);
A<3> c = f("foo");
// expected-error@-1 {{no matching function}}
// expected-note@#cwg339-f {{candidate}}
}
char f(int);
int f(...);
template <class T> struct conv_int {
static const bool value = sizeof(f(T())) == 1;
};
template <class T> bool conv_int2(A<sizeof(f(T()))> p);
template<typename T> A<sizeof(f(T()))> make_A();
static_assert(conv_int<char>::value, "");
bool b = conv_int2<char>(A<1>());
A<1> c = make_A<char>();
}
namespace cwg340 { // cwg340: yes
struct A { A(int); };
struct B { B(A, A, int); };
int x, y;
B b(A(x), A(y), 3);
}
namespace cwg341 { // cwg341: sup 1708
namespace A {
int n;
extern "C" int &cwg341_a = n; // #cwg341_a
}
namespace B {
extern "C" int &cwg341_a = cwg341_a;
// expected-error@-1 {{redefinition of 'cwg341_a'}}
// expected-note@#cwg341_a {{previous definition is here}}
}
extern "C" void cwg341_b(); // #cwg341_b
}
int cwg341_a;
// expected-error@-1 {{declaration of 'cwg341_a' in global scope conflicts with declaration with C language linkage}}
// expected-note@#cwg341_a {{declared with C language linkage here}}
int cwg341_b;
// expected-error@-1 {{declaration of 'cwg341_b' in global scope conflicts with declaration with C language linkage}}
// expected-note@#cwg341_b {{declared with C language linkage here}}
int cwg341_c; // #cwg341_c
int cwg341_d; // #cwg341_d
namespace cwg341 {
extern "C" int cwg341_c;
// expected-error@-1 {{declaration of 'cwg341_c' with C language linkage conflicts with declaration in global scope}}
// expected-note@#cwg341_c {{declared in global scope here}}
extern "C" void cwg341_d();
// expected-error@-1 {{declaration of 'cwg341_d' with C language linkage conflicts with declaration in global scope}}
// expected-note@#cwg341_d {{declared in global scope here}}
namespace A { extern "C" int cwg341_e; } // #cwg341_e
namespace B { extern "C" void cwg341_e(); }
// expected-error@-1 {{redefinition of 'cwg341_e' as different kind of symbol}}
// expected-note@#cwg341_e {{previous definition is here}}
}
// cwg342: na
namespace cwg343 { // cwg343: no
// FIXME: dup 1710
template<typename T> struct A {
template<typename U> struct B {};
};
// FIXME: In these contexts, the 'template' keyword is optional.
template<typename T> struct C : public A<T>::B<T> {
// expected-error@-1 {{use 'template' keyword to treat 'B' as a dependent template name}}
C() : A<T>::B<T>() {}
// expected-error@-1 {{use 'template' keyword to treat 'B' as a dependent template name}}
};
}
namespace cwg344 { // cwg344: dup 1435
struct A { inline virtual ~A(); };
struct B { friend A::~A(); };
}
namespace cwg345 { // cwg345: yes
struct A {
struct X {};
int X; // #cwg345-int-X
};
struct B {
struct X {};
};
template <class T> void f(T t) { typename T::X x; }
// expected-error@-1 {{typename specifier refers to non-type member 'X' in 'cwg345::A'}}
// expected-note@#cwg345-f-a {{in instantiation of function template specialization 'cwg345::f<cwg345::A>' requested here}}
// expected-note@#cwg345-int-X {{referenced member 'X' is declared here}}
void f(A a, B b) {
f(b);
f(a); // #cwg345-f-a
}
}
// cwg346: na
namespace cwg347 { // cwg347: yes
struct base {
struct nested;
static int n;
static void f();
void g();
};
struct derived : base {}; // #cwg347-derived
struct derived::nested {};
// expected-error@-1 {{no struct named 'nested' in 'cwg347::derived'}}
int derived::n;
// expected-error@-1 {{no member named 'n' in 'cwg347::derived'}}
void derived::f() {}
// expected-error@-1 {{out-of-line definition of 'f' does not match any declaration in 'cwg347::derived'}}
// expected-note@#cwg347-derived {{defined here}}
void derived::g() {}
// expected-error@-1 {{out-of-line definition of 'g' does not match any declaration in 'cwg347::derived'}}
// expected-note@#cwg347-derived {{defined here}}
}
// cwg348: na
namespace cwg349 { // cwg349: no
struct A {
template <class T> operator T ***() {
int ***p = 0;
return p;
// cxx98-20-error@-1 {{cannot initialize return object of type 'const int ***' with an lvalue of type 'int ***'}}
// since-cxx23-error@-2 {{cannot initialize return object of type 'const int ***' with an rvalue of type 'int ***'}}
// expected-note@#cwg349-p1 {{in instantiation of function template specialization 'cwg349::A::operator const int ***<const int>' requested here}}
}
};
// FIXME: This is valid.
A a;
const int *const *const *p1 = a; // #cwg349-p1
struct B {
template <class T> operator T ***() {
const int ***p = 0;
return p;
}
};
// FIXME: This is invalid.
B b;
const int *const *const *p2 = b;
}
// cwg351: na
namespace cwg352 { // cwg352: 2.8
namespace example1 {
namespace A {
enum E {};
template<typename R, typename A> void foo(E, R (*)(A)); // #cwg352-foo
}
template<typename T> void arg(T);
template<typename T> int arg(T) = delete; // #cwg352-deleted
// cxx98-error@-1 {{deleted function definitions are a C++11 extension}}
void f(A::E e) {
foo(e, &arg);
// expected-error@-1 {{no matching function for call to 'foo'}}
// expected-note@#cwg352-foo {{candidate template ignored: couldn't infer template argument 'R'}}
using A::foo;
foo<int, int>(e, &arg);
// expected-error@-1 {{attempt to use a deleted function}}
// expected-note@#cwg352-deleted {{'arg<int>' has been explicitly marked deleted here}}
}
int arg(int);
void g(A::E e) {
foo(e, &arg);
// expected-error@-1 {{no matching function for call to 'foo'}}
// expected-note@#cwg352-foo {{candidate template ignored: couldn't infer template argument 'R'}}
using A::foo;
foo<int, int>(e, &arg); // ok, uses non-template
}
}
namespace contexts {
template<int I> void f1(int (&)[I]);
template<int I> void f2(int (&)[I+1]); // #cwg352-f2
template<int I> void f3(int (&)[I+1], int (&)[I]);
void f() {
int a[4];
int b[3];
f1(a);
f2(a);
// expected-error@-1 {{no matching function for call to 'f2'}}
// expected-note@#cwg352-f2 {{candidate template ignored: couldn't infer template argument 'I'}}
f3(a, b);
}
template<int I> struct S {};
template<int I> void g1(S<I>);
template<int I> void g2(S<I+1>); // #cwg352-g2
template<int I> void g3(S<I+1>, S<I>);
void g() {
S<4> a;
S<3> b;
g1(a);
g2(a);
// expected-error@-1 {{no matching function for call to 'g2'}}
// expected-note@#cwg352-g2 {{candidate template ignored: couldn't infer template argument 'I'}}
g3(a, b);
}
template<typename T> void h1(T = 0); // #cwg352-h1
template<typename T> void h2(T, T = 0);
void h() {
h1();
// expected-error@-1 {{no matching function for call to 'h1'}}
// expected-note@#cwg352-h1 {{candidate template ignored: couldn't infer template argument 'T'}}
h1(0);
h1<int>();
h2(0);
}
template<typename T> int tmpl(T);
template<typename R, typename A> void i1(R (*)(A)); // #cwg352-i1
template<typename R, typename A> void i2(R, A, R (*)(A)); // #cwg352-i2
void i() {
extern int single(int);
i1(single);
i2(0, 0, single);
extern int ambig(float), ambig(int);
i1(ambig);
// expected-error@-1 {{no matching function for call to 'i1'}}
// expected-note@#cwg352-i1 {{candidate template ignored: couldn't infer template argument 'R'}}
i2(0, 0, ambig);
extern void no_match(float), no_match(int);
i1(no_match);
// expected-error@-1 {{no matching function for call to 'i1'}}
// expected-note@#cwg352-i1 {{candidate template ignored: couldn't infer template argument 'R'}}
i2(0, 0, no_match);
// expected-error@-1 {{no matching function for call to 'i2'}}
// expected-note@#cwg352-i2 {{candidate function [with R = int, A = int] not viable: no overload of 'no_match' matching 'int (*)(int)' for 3rd argument}}
i1(tmpl);
// expected-error@-1 {{no matching function for call to 'i1'}}
// expected-note@#cwg352-i1 {{candidate template ignored: couldn't infer template argument 'R'}}
i2(0, 0, tmpl);
}
}
template<typename T> struct is_int;
template<> struct is_int<int> {};
namespace example2 {
template<typename T> int f(T (*p)(T)) { is_int<T>(); }
int g(int);
int g(char);
int i = f(g);
}
namespace example3 {
template<typename T> int f(T, T (*p)(T)) { is_int<T>(); }
int g(int);
char g(char);
int i = f(1, g);
}
namespace example4 {
template <class T> int f(T, T (*p)(T)) { is_int<T>(); }
char g(char);
template <class T> T g(T);
int i = f(1, g);
}
namespace example5 {
template<int I> class A {};
template<int I> void g(A<I+1>); // #cwg352-g
template<int I> void f(A<I>, A<I+1>);
void h(A<1> a1, A<2> a2) {
g(a1);
// expected-error@-1 {{no matching function for call to 'g'}}
// expected-note@#cwg352-g {{candidate template ignored: couldn't infer template argument 'I'}}
g<0>(a1);
f(a1, a2);
}
}
}
// cwg353 needs an IRGen test.
namespace cwg354 { // cwg354: yes c++11
// FIXME: Should we allow this in C++98 too?
struct S {};
template<int*> struct ptr {}; // #cwg354-ptr
ptr<0> p0; // #cwg354-p0
// cxx98-error@#cwg354-p0 {{non-type template argument does not refer to any declaration}}
// cxx98-note@#cwg354-ptr {{template parameter is declared here}}
// cxx11-14-error@#cwg354-p0 {{null non-type template argument must be cast to template parameter type 'int *'}}
// cxx11-14-note@#cwg354-ptr {{template parameter is declared here}}
// since-cxx17-error@#cwg354-p0 {{conversion from 'int' to 'int *' is not allowed in a converted constant expression}}
ptr<(int*)0> p1;
// cxx98-error@-1 {{non-type template argument does not refer to any declaration}}
// cxx98-note@#cwg354-ptr {{template parameter is declared here}}
ptr<(float*)0> p2; // #cwg354-p2
// cxx98-error@#cwg354-p2 {{non-type template argument does not refer to any declaration}}
// cxx98-note@#cwg354-ptr {{template parameter is declared here}}
// cxx11-14-error@#cwg354-p2 {{null non-type template argument of type 'float *' does not match template parameter of type 'int *'}}
// cxx11-14-note@#cwg354-ptr {{template parameter is declared here}}
// since-cxx17-error@#cwg354-p2 {{value of type 'float *' is not implicitly convertible to 'int *'}}
ptr<(int S::*)0> p3; // #cwg354-p3
// cxx98-error@#cwg354-p3 {{non-type template argument does not refer to any declaration}}
// cxx98-note@#cwg354-ptr {{template parameter is declared here}}
// cxx11-14-error@#cwg354-p3 {{null non-type template argument of type 'int cwg354::S::*' does not match template parameter of type 'int *'}}
// cxx11-14-note@#cwg354-ptr {{template parameter is declared here}}
// since-cxx17-error@#cwg354-p3 {{value of type 'int cwg354::S::*' is not implicitly convertible to 'int *'}}
template<int*> int both(); // #cwg354-both-int-ptr
template<int> int both(); // #cwg354-both-int
int b0 = both<0>();
int b1 = both<(int*)0>();
// cxx98-error@-1 {{no matching function for call to 'both'}}
// cxx98-note@#cwg354-both-int-ptr {{candidate template ignored: invalid explicitly-specified argument for 1st template parameter}}
// cxx98-note@#cwg354-both-int {{candidate template ignored: invalid explicitly-specified argument for 1st template parameter}}
template<int S::*> struct ptr_mem {}; // #cwg354-ptr_mem
ptr_mem<0> m0; // #cwg354-m0
// cxx98-error@#cwg354-m0 {{non-type template argument of type 'int' cannot be converted to a value of type 'int cwg354::S::*'}}
// cxx98-note@#cwg354-ptr_mem {{template parameter is declared here}}
// cxx11-14-error@#cwg354-m0 {{null non-type template argument must be cast to template parameter type 'int cwg354::S::*'}}
// cxx11-14-note@#cwg354-ptr_mem {{template parameter is declared here}}
// since-cxx17-error@#cwg354-m0 {{conversion from 'int' to 'int cwg354::S::*' is not allowed in a converted constant expression}}
ptr_mem<(int S::*)0> m1;
// cxx98-error@-1 {{non-type template argument is not a pointer to member constant}}
ptr_mem<(float S::*)0> m2; // #cwg354-m2
// cxx98-error@#cwg354-m2 {{non-type template argument of type 'float cwg354::S::*' cannot be converted to a value of type 'int cwg354::S::*'}}
// cxx98-note@#cwg354-ptr_mem {{template parameter is declared here}}
// cxx11-14-error@#cwg354-m2 {{null non-type template argument of type 'float cwg354::S::*' does not match template parameter of type 'int cwg354::S::*'}}
// cxx11-14-note@#cwg354-ptr_mem {{template parameter is declared here}}
// since-cxx17-error@#cwg354-m2 {{value of type 'float cwg354::S::*' is not implicitly convertible to 'int cwg354::S::*'}}
ptr_mem<(int *)0> m3; // #cwg354-m3
// cxx98-error@#cwg354-m3 {{non-type template argument of type 'int *' cannot be converted to a value of type 'int cwg354::S::*'}}
// cxx98-note@#cwg354-ptr_mem {{template parameter is declared here}}
// cxx11-14-error@#cwg354-m3 {{null non-type template argument of type 'int *' does not match template parameter of type 'int cwg354::S::*'}}
// cxx11-14-note@#cwg354-ptr_mem {{template parameter is declared here}}
// since-cxx17-error@#cwg354-m3 {{value of type 'int *' is not implicitly convertible to 'int cwg354::S::*'}}
}
struct cwg355_S; // cwg355: yes
struct ::cwg355_S {};
// expected-warning@-1 {{extra qualification on member 'cwg355_S'}}
namespace cwg355 { struct ::cwg355_S s; }
// cwg356: na
namespace cwg357 { // cwg357: yes
template<typename T> struct A { // #cwg357-A
void f() const; // #cwg357-f
};
template<typename T> void A<T>::f() {}
// expected-error@-1 {{out-of-line definition of 'f' does not match any declaration in 'A<T>'}}
// expected-note@#cwg357-A {{defined here}}
// expected-note@#cwg357-f {{member declaration does not match because it is const qualified}}
struct B { // #cwg357-B
template<typename T> void f();
};
template<typename T> void B::f() const {}
// expected-error@-1 {{out-of-line definition of 'f' does not match any declaration in 'cwg357::B'}}
// expected-note@#cwg357-B {{defined here}}
}
namespace cwg358 { // cwg358: yes
extern "C" void cwg358_f();
namespace N {
int var;
extern "C" void cwg358_f() { var = 10; }
}
}
namespace cwg359 { // cwg359: yes
// Note, the example in the DR is wrong; it doesn't contain an anonymous
// union.
struct E {
union {
struct {
int x;
} s;
} v;
union {
struct {
// expected-error@-1 {{anonymous types declared in an anonymous union are an extension}}
int x;
} s;
struct S {
// expected-error@-1 {{types cannot be declared in an anonymous union}}
int x;
} t;
union {
// expected-error@-1 {{anonymous types declared in an anonymous union are an extension}}
int u;
};
};
};
}
namespace cwg360 { // cwg360: yes
struct A {
int foo();
int bar();
protected:
int baz();
};
struct B : A {
private:
using A::foo; // #cwg360-using-foo
protected:
using A::bar; // #cwg360-using-bar
public:
using A::baz;
};
int main() {
int foo = B().foo();
// expected-error@-1 {{'foo' is a private member of 'cwg360::B'}}
// expected-note@#cwg360-using-foo {{declared private here}}
int bar = B().bar();
// expected-error@-1 {{'bar' is a protected member of 'cwg360::B'}}
// expected-note@#cwg360-using-bar {{declared protected here}}
int baz = B().baz();
}
} // namespace cwg360
// cwg362: na
// cwg363: na
namespace cwg364 { // cwg364: yes
struct S {
static void f(int);
void f(char);
};
void g() {
S::f('a');
// expected-error@-1 {{call to non-static member function without an object argument}}
S::f(0);
}
}
// cwg366: yes
#if "foo" // expected-error {{invalid token at start of a preprocessor expression}}
#endif
namespace cwg367 { // cwg367: yes
static_assert(__enable_constant_folding(true ? throw 0 : 4), "");
// expected-error@-1 {{expression is not an integral constant expression}}
static_assert(__enable_constant_folding(true ? 4 : throw 0), "");
static_assert(__enable_constant_folding(true ? *new int : 4), "");
// expected-error@-1 {{expression is not an integral constant expression}}
// expected-note@-2 {{read of uninitialized object is not allowed in a constant expression}}
static_assert(__enable_constant_folding(true ? 4 : *new int), "");
}
namespace cwg368 { // cwg368: 3.6
template<typename T, T> struct S {}; // #cwg368-S
template<typename T> int f(S<T, T()> *);
// expected-error@-1 {{template argument for non-type template parameter is treated as function type 'T ()'}}
// expected-note@#cwg368-S {{template parameter is declared here}}
template<typename T> int g(S<T, (T())> *); // #cwg368-g
template<typename T> int g(S<T, true ? T() : T()> *); // #cwg368-g-2
struct X {};
int n = g<X>(0); // #cwg368-g-call
// cxx98-17-error@#cwg368-g-call {{no matching function for call to 'g'}}
// cxx98-17-note@#cwg368-g {{candidate template ignored: substitution failure [with T = X]: a non-type template parameter cannot have type 'X' before C++20}}
// cxx98-17-note@#cwg368-g-2 {{candidate template ignored: substitution failure [with T = X]: a non-type template parameter cannot have type 'X' before C++20}}
// cxx20-23-error@#cwg368-g-call {{call to 'g' is ambiguous}}
// cxx20-23-note@#cwg368-g {{candidate function [with T = cwg368::X]}}
// cxx20-23-note@#cwg368-g-2 {{candidate function [with T = cwg368::X]}}
}
// cwg370: na
namespace cwg372 { // cwg372: no
namespace example1 {
template<typename T> struct X {
protected:
typedef T Type; // #cwg372-ex1-Type
};
template<typename T> struct Y {};
// FIXME: These two are valid; deriving from T1<T> gives Z1 access to
// the protected member T1<T>::Type.
template<typename T,
template<typename> class T1,
template<typename> class T2> struct Z1 :
T1<T>,
T2<typename T1<T>::Type> {};
// expected-error@-1 {{'Type' is a protected member of 'cwg372::example1::X<int>'}}
// expected-note@#cwg372-z1 {{in instantiation of template class 'cwg372::example1::Z1<int, cwg372::example1::X, cwg372::example1::Y>' requested here}}
// expected-note@#cwg372-ex1-Type {{declared protected here}}
template<typename T,
template<typename> class T1,
template<typename> class T2> struct Z2 :
T2<typename T1<T>::Type>,
// expected-error@-1 {{'Type' is a protected member of 'cwg372::example1::X<int>'}}
// expected-note@#cwg372-z2 {{in instantiation of template class 'cwg372::example1::Z2<int, cwg372::example1::X, cwg372::example1::Y>' requested here}}
// expected-note@#cwg372-ex1-Type {{declared protected here}}
T1<T> {};
Z1<int, X, Y> z1; // #cwg372-z1
Z2<int, X, Y> z2; // #cwg372-z2
}
namespace example2 {
struct X {
private:
typedef int Type; // #cwg372-ex2-Type
};
template<typename T> struct A {
typename T::Type t;
// expected-error@-1 {{'Type' is a private member of 'cwg372::example2::X'}}
// expected-note@#cwg372-ax {{in instantiation of template class 'cwg372::example2::A<cwg372::example2::X>' requested here}}
// expected-note@#cwg372-ex2-Type {{declared private here}}
};
A<X> ax; // #cwg372-ax
}
namespace example3 {
struct A {
protected:
typedef int N; // #cwg372-N
};
template<typename T> struct B {};
template<typename U> struct C : U, B<typename U::N> {};
// expected-error@-1 {{'N' is a protected member of 'cwg372::example3::A'}}
// expected-note@#cwg372-x {{in instantiation of template class 'cwg372::example3::C<cwg372::example3::A>' requested here}}
// expected-note@#cwg372-N {{declared protected here}}
template<typename U> struct D : B<typename U::N>, U {};
// expected-error@-1 {{'N' is a protected member of 'cwg372::example3::A'}}
// expected-note@#cwg372-y {{in instantiation of template class 'cwg372::example3::D<cwg372::example3::A>' requested here}}
// expected-note@#cwg372-N {{declared protected here}}
C<A> x; // #cwg372-x
D<A> y; // #cwg372-y
}
namespace example4 {
class A {
class B {};
friend class X;
};
struct X : A::B {
A::B mx;
class Y {
A::B my;
};
};
}
// FIXME: This is valid: deriving from A gives D access to A::B
namespace std_example {
class A {
protected:
struct B {}; // #cwg372-B-std
};
struct D : A::B, A {};
// expected-error@-1 {{'B' is a protected member of 'cwg372::std_example::A'}}
// expected-note@#cwg372-B-std {{declared protected here}}
}
// FIXME: This is valid: deriving from A::B gives access to A::B!
namespace badwolf {
class A {
protected:
struct B; // #cwg372-B
};
struct A::B : A {};
struct C : A::B {};
// expected-error@-1 {{'B' is a protected member of 'cwg372::badwolf::A'}}
// expected-note@#cwg372-B {{declared protected here}}
}
}
namespace cwg373 { // cwg373: 5
namespace X { int cwg373; }
struct cwg373 { // #cwg373-struct
void f() {
using namespace cwg373::X;
int k = cwg373;
// expected-error@-1 {{'cwg373' does not refer to a value}}
// expected-note@#cwg373-struct {{declared here}}
namespace Y = cwg373::X;
k = Y::cwg373;
}
};
struct A { struct B {}; }; // #cwg373-A
namespace X = A::B;
// expected-error@-1 {{expected namespace name}}
// expected-note@#cwg373-A {{'A' declared here}}
using namespace A::B;
// expected-error@-1 {{expected namespace name}}
// expected-note@#cwg373-A {{'A' declared here}}
}
namespace cwg374 { // cwg374: 7
// NB 2.9 c++11
namespace N {
template<typename T> void f();
template<typename T> struct A { void f(); };
}
template<> void N::f<char>() {}
template<> void N::A<char>::f() {}
template<> struct N::A<int> {};
}
// cwg375: dup 345
// cwg376: na
namespace cwg377 { // cwg377: yes
enum E {
// expected-error@-1 {{enumeration values exceed range of largest integer}}
a = -__LONG_LONG_MAX__ - 1,
// cxx98-error@-1 {{'long long' is a C++11 extension}}
b = 2 * (unsigned long long)__LONG_LONG_MAX__
// cxx98-error@-1 {{'long long' is a C++11 extension}}
// cxx98-error@-2 {{'long long' is a C++11 extension}}
};
}
// cwg378: dup 276
// cwg379: na
namespace cwg381 { // cwg381: yes
struct A {
int a;
};
struct B : virtual A {};
struct C : B {};
struct D : B {};
struct E : public C, public D {};
struct F : public A {};
void f() {
E e;
e.B::a = 0;
/* expected-error@-1 {{ambiguous conversion from derived class 'E' to base class 'cwg381::B':
struct cwg381::E -> C -> B
struct cwg381::E -> D -> B}} */
F f;
f.A::a = 1;
}
}
namespace cwg382 { // cwg382: yes c++11
// FIXME: Should we allow this in C++98 mode?
struct A { typedef int T; };
typename A::T t;
// cxx98-error@-1 {{'typename' occurs outside of a template}}
typename cwg382::A a;
// cxx98-error@-1 {{'typename' occurs outside of a template}}
typename A b;
// expected-error@-1 {{expected a qualified name after 'typename'}}
}
namespace cwg383 { // cwg383: yes
struct A { A &operator=(const A&); };
struct B { ~B(); };
union C { C &operator=(const C&); };
union D { ~D(); };
static_assert(!__is_pod(A) && !__is_pod(B) && !__is_pod(C) && !__is_pod(D), "");
}
namespace cwg384 { // cwg384: yes
namespace N1 {
template<typename T> struct Base {};
template<typename T> struct X {
struct Y : public Base<T> {
Y operator+(int) const;
};
Y f(unsigned i) { return Y() + i; }
};
}
namespace N2 {
struct Z {};
template<typename T> int *operator+(T, unsigned);
}
int main() {
N1::X<N2::Z> v;
v.f(0);
}
}
namespace cwg385 { // cwg385: 2.8
struct A { protected: void f(); };
struct B : A { using A::f; };
struct C : A { void g(B b) { b.f(); } };
void h(B b) { b.f(); }
struct D { int n; }; // #cwg385-n
struct E : protected D {}; // #cwg385-E
struct F : E { friend int i(E); };
int i(E e) { return e.n; }
// expected-error@-1 {{'n' is a protected member of 'cwg385::D'}}
// expected-note@#cwg385-E {{constrained by protected inheritance here}}
// expected-note@#cwg385-n {{member is declared here}}
}
namespace cwg386 { // cwg386: no
namespace example1 {
namespace N1 {
// Binds name 'f' in N1. Target scope is N1.
template<typename T> void f( T* x ) {
// ... other stuff ...
delete x;
}
}
namespace N2 {
// Bind name 'f' in N2. When a single search find this declaration,
// it's replaced with N1::f declaration.
using N1::f;
// According to _N4988_.[dcl.meaning]/3.3:
// `f<int>` is not a qualified-id, so its target scope is N2.
// `f<int>` is a template-id, so 'f' undergoes (unqualified) lookup.
// Search performed by unqualified lookup finds N1::f via using-declaration,
// but this result is not considered, because it's not nominable in N2,
// which is because its target scope is N1.
// So unqualified lookup doesn't find anything, making this declaration ill-formed.
template<> void f<int>( int* );
// expected-error@-1 {{no function template matches function template specialization 'f'}}
class Test {
~Test() { }
// According to _N4988_.[dcl.meaning]/2.2:
// `f<>` is a template-id and not a template declaration,
// so its terminal name 'f' undergoes (unqualified) lookup.
// Search in N2 performed by unqualified lookup finds
// (single) N1::f declaration via using-declaration.
// N1::f is replaced with N1::f<> specialization after deduction,
// and this is the result of the unqualified lookup.
// This friend declaration correspond to the result of the lookup.
// All lookup results target the same scope, which is N1,
// so target scope of this friend declaration is also N1.
// FIXME: This is well-formed.
friend void f<>( Test* x );
// expected-error@-1 {{no function template matches function template specialization 'f'}}
};
}
} // namespace example1
namespace example2 {
namespace N1 {
// Binds name 'f' in N1. Target scope is N1.
void f(); // #cwg386-ex2-N1-f
}
namespace N2 {
// Bind name 'f' in N2. When a single search finds this declaration,
// it's replaced with N1::f declaration.
using N1::f; // #cwg386-ex2-using
class A {
// According to _N4988_.[dcl.meaning]/2.2:
// `N2::f` is a qualified-id, so its terminal name 'f' undergoes (qualified) lookup.
// Search in N2 performed by qualified lookup finds N1::f via using-declaration,
// which is the (only) result of qualified lookup.
// This friend declaration corresponds to the result of the lookup.
// All lookup results target the same scope, which is N1,
// so target scope of this friend declaration is also N1.
// FIXME: This is well-formed.
friend void N2::f();
// expected-error@-1 {{cannot befriend target of using declaration}}
// expected-note@#cwg386-ex2-N1-f {{target of using declaration}}
// expected-note@#cwg386-ex2-using {{using declaration}}
};
}
} // namespace example2
} // namespace cwg386
namespace cwg387 { // cwg387: 2.8
namespace old {
template<typename T> class number {
number(int); // #cwg387-number-ctor
friend number gcd(number &x, number &y) {}
};
void g() {
number<double> a(3);
// expected-error@-1 {{calling a private constructor of class 'cwg387::old::number<double>'}}
// expected-note@#cwg387-number-ctor {{implicitly declared private here}}
number<double> b(4);
// expected-error@-1 {{calling a private constructor of class 'cwg387::old::number<double>'}}
// expected-note@#cwg387-number-ctor {{implicitly declared private here}}
a = gcd(a, b);
b = gcd(3, 4);
// expected-error@-1 {{use of undeclared identifier 'gcd'}}
}
}
namespace newer {
template <typename T> class number {
public:
number(int);
friend number gcd(number x, number y) { return 0; }
};
void g() {
number<double> a(3), b(4);
a = gcd(a, b);
b = gcd(3, 4);
// expected-error@-1 {{use of undeclared identifier 'gcd'}}
}
}
}
// FIXME: cwg388 needs libc++abi test
namespace cwg389 { // cwg389: no
struct S {
typedef struct {} A;
typedef enum {} B;
typedef struct {} const C; // #cwg389-C
typedef enum {} const D; // #cwg389-D
};
template<typename> struct T {};
struct WithLinkage1 {};
enum WithLinkage2 {};
typedef struct {} *WithLinkage3a, WithLinkage3b;
typedef enum {} WithLinkage4a, *WithLinkage4b;
typedef S::A WithLinkage5;
typedef const S::B WithLinkage6;
typedef int WithLinkage7;
typedef void (*WithLinkage8)(WithLinkage2 WithLinkage1::*, WithLinkage5 *);
typedef T<WithLinkage5> WithLinkage9;
typedef struct {} *WithoutLinkage1; // #cwg389-no-link-1
typedef enum {} const WithoutLinkage2; // #cwg389-no-link-2
// These two types don't have linkage even though they are externally visible
// and the ODR requires them to be merged across TUs.
typedef S::C WithoutLinkage3;
typedef S::D WithoutLinkage4;
typedef void (*WithoutLinkage5)(int (WithoutLinkage3::*)(char));
#if __cplusplus >= 201103L
// This has linkage even though its template argument does not.
// FIXME: This is probably a defect.
typedef T<WithoutLinkage1> WithLinkage10;
#else
typedef int WithLinkage10; // dummy
typedef T<WithLinkage1> GoodArg1;
typedef T<WithLinkage2> GoodArg2;
typedef T<WithLinkage3a> GoodArg3a;
typedef T<WithLinkage3b> GoodArg3b;
typedef T<WithLinkage4a> GoodArg4a;
typedef T<WithLinkage4b> GoodArg4b;
typedef T<WithLinkage5> GoodArg5;
typedef T<WithLinkage6> GoodArg6;
typedef T<WithLinkage7> GoodArg7;
typedef T<WithLinkage8> GoodArg8;
typedef T<WithLinkage9> GoodArg9;
typedef T<WithoutLinkage1> BadArg1;
// expected-error@-1 {{template argument uses unnamed type}}
// expected-note@#cwg389-no-link-1 {{unnamed type used in template argument was declared here}}
typedef T<WithoutLinkage2> BadArg2;
// expected-error@-1 {{template argument uses unnamed type}}
// expected-note@#cwg389-no-link-2 {{unnamed type used in template argument was declared here}}
typedef T<WithoutLinkage3> BadArg3;
// expected-error@-1 {{template argument uses unnamed type}}
// expected-note@#cwg389-C {{unnamed type used in template argument was declared here}}
typedef T<WithoutLinkage4> BadArg4;
// expected-error@-1 {{template argument uses unnamed type}}
// expected-note@#cwg389-D {{unnamed type used in template argument was declared here}}
typedef T<WithoutLinkage5> BadArg5;
// expected-error@-1 {{template argument uses unnamed type}}
// expected-note@#cwg389-C {{unnamed type used in template argument was declared here}}
#endif
extern WithLinkage1 withLinkage1;
extern WithLinkage2 withLinkage2;
extern WithLinkage3a withLinkage3a;
extern WithLinkage3b withLinkage3b;
extern WithLinkage4a withLinkage4a;
extern WithLinkage4b withLinkage4b;
extern WithLinkage5 withLinkage5;
extern WithLinkage6 withLinkage6;
extern WithLinkage7 withLinkage7;
extern WithLinkage8 withLinkage8;
extern WithLinkage9 withLinkage9;
extern WithLinkage10 withLinkage10;
// FIXME: These are all ill-formed.
extern WithoutLinkage1 withoutLinkage1;
extern WithoutLinkage2 withoutLinkage2;
extern WithoutLinkage3 withoutLinkage3;
extern WithoutLinkage4 withoutLinkage4;
extern WithoutLinkage5 withoutLinkage5;
// OK, extern "C".
extern "C" {
extern WithoutLinkage1 cwg389_withoutLinkage1;
extern WithoutLinkage2 cwg389_withoutLinkage2;
extern WithoutLinkage3 cwg389_withoutLinkage3;
extern WithoutLinkage4 cwg389_withoutLinkage4;
extern WithoutLinkage5 cwg389_withoutLinkage5;
}
// OK, defined.
WithoutLinkage1 withoutLinkageDef1;
WithoutLinkage2 withoutLinkageDef2 = WithoutLinkage2();
WithoutLinkage3 withoutLinkageDef3 = {};
WithoutLinkage4 withoutLinkageDef4 = WithoutLinkage4();
WithoutLinkage5 withoutLinkageDef5;
void use(const void *);
void use_all() {
use(&withLinkage1); use(&withLinkage2); use(&withLinkage3a); use(&withLinkage3b);
use(&withLinkage4a); use(&withLinkage4b); use(&withLinkage5); use(&withLinkage6);
use(&withLinkage7); use(&withLinkage8); use(&withLinkage9); use(&withLinkage10);
use(&withoutLinkage1); use(&withoutLinkage2); use(&withoutLinkage3);
use(&withoutLinkage4); use(&withoutLinkage5);
use(&cwg389_withoutLinkage1); use(&cwg389_withoutLinkage2);
use(&cwg389_withoutLinkage3); use(&cwg389_withoutLinkage4);
use(&cwg389_withoutLinkage5);
use(&withoutLinkageDef1); use(&withoutLinkageDef2); use(&withoutLinkageDef3);
use(&withoutLinkageDef4); use(&withoutLinkageDef5);
}
void local() {
// FIXME: This is ill-formed.
extern WithoutLinkage1 withoutLinkageLocal;
}
}
namespace cwg390 { // cwg390: 3.3
template<typename T>
struct A {
A() { 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 'cwg390::A<int>'}}
// expected-note@#cwg390-A-int {{in instantiation of member function 'cwg390::A<int>::A' requested here}}
// expected-note@#cwg390-f {{'f' declared here}}
virtual void f() = 0; // #cwg390-f
virtual ~A() = 0;
};
template<typename T> A<T>::~A() { T::error; }
// expected-error@-1 {{type 'int' cannot be used prior to '::' because it has no members}}
// expected-note@#cwg390-A-int {{in instantiation of member function 'cwg390::A<int>::~A' requested here}}
template<typename T> void A<T>::f() { T::error; } // ok, not odr-used
struct B : A<int> { // #cwg390-A-int
void f() {}
} b;
}
namespace cwg391 { // cwg391: 2.8 c++11
// FIXME: Should this apply to C++98 too?
class A { A(const A&); }; // #cwg391-A
A fa();
const A &a = fa();
// cxx98-error@-1 {{C++98 requires an accessible copy constructor for class 'cwg391::A' when binding a reference to a temporary; was private}}
// cxx98-note@#cwg391-A {{implicitly declared private here}}
struct B { B(const B&) = delete; }; // #cwg391-B
// cxx98-error@-1 {{deleted function definitions are a C++11 extension}}
B fb();
const B &b = fb();
// cxx98-error@-1 {{copying variable of type 'B' invokes deleted constructor}}
// cxx98-note@#cwg391-B {{'B' has been explicitly marked deleted here}}
template<typename T>
struct C {
C(const C&) { T::error; }
};
C<int> fc();
const C<int> &c = fc();
}
// cwg392 is in cwg392.cpp
namespace cwg393 { // cwg393: 2.7
template <typename T>
struct S {};
void f1(S<int (*)[]>);
void f2(S<int (&)[]>);
void g(int(*S<int>::*)[]);
template<typename T>
void sp_assert_convertible( T* ) {}
template<typename T, typename U>
void h() {
T (*p) [] = (U(*)[])0;
sp_assert_convertible<T[]>( (U(*)[])0 );
}
} // namespace cwg393
// cwg394: na
namespace cwg395 { // cwg395: 3.0
struct S {
template <typename T, int N>(&operator T())[N];
// expected-error@-1 {{cannot specify any part of a return type in the declaration of a conversion function}}
template <typename T, int N> operator(T (&)[N])();
// expected-error@-1 {{expected ')'}}
// expected-note@-2 {{to match this '('}}
// expected-error@-3 {{a type specifier is required for all declarations}}
template <typename T> operator T *() const { return 0; }
template <typename T, typename U> operator T U::*() const { return 0; }
template <typename T, typename U> operator T (U::*)()() const { return 0; }
// expected-error@-1 {{a type specifier is required for all declarations}}
// expected-error@-2 {{conversion function cannot have any parameters}}
// expected-error@-3 {{cannot specify any part of a return type in the declaration of a conversion function}}
// expected-error@-4 {{conversion function cannot convert to a function type}}
};
struct null1_t {
template <class T, class U> struct ptr_mem_fun_t {
typedef T (U::*type)();
};
template <class T, class U>
operator typename ptr_mem_fun_t<T, U>::type() const { // #cwg395-conv-func
return 0;
}
} null1;
int (S::*p)() = null1;
// expected-error@-1 {{no viable conversion from 'struct null1_t' to 'int (cwg395::S::*)()'}}
// expected-note@#cwg395-conv-func {{candidate template ignored: couldn't infer template argument 'T'}}
template <typename T> using id = T;
// cxx98-error@-1 {{alias declarations are a C++11 extension}}
struct T {
template <typename T, int N> operator id<T[N]> &();
template <typename T, typename U> operator id<T (U::*)()>() const;
};
struct null2_t {
template<class T, class U> using ptr_mem_fun_t = T (U::*)();
// cxx98-error@-1 {{alias declarations are a C++11 extension}}
template<class T, class U> operator ptr_mem_fun_t<T, U>() const { return 0; };
} null2;
int (S::*q)() = null2;
}
namespace cwg396 { // cwg396: yes
void f() {
auto int a();
// since-cxx11-error@-1 {{'auto' storage class specifier is not permitted in C++11, and will not be supported in future releases}}
// expected-error@-2 {{illegal storage class on function}}
int (i); // #cwg396-i
auto int (i);
// since-cxx11-error@-1 {{'auto' storage class specifier is not permitted in C++11, and will not be supported in future releases}}
// expected-error@-2 {{redefinition of 'i'}}
// expected-note@#cwg396-i {{previous definition is here}}
}
}
// cwg397: sup 1823
namespace cwg398 { // cwg398: yes
namespace example1 {
struct S {
static int const I = 42;
};
template <int N> struct X {};
template <typename T> void f(X<T::I> *) {}
template <typename T> void f(X<T::J> *) {}
void foo() { f<S>(0); }
}
namespace example2 {
template <int I> struct X {};
template <template <class T> class> struct Z {};
template <class T> void f(typename T::Y *) {} // #cwg398-f
template <class T> void g(X<T::N> *) {} // #cwg398-g
template <class T> void h(Z<T::template TT> *) {} // #cwg398-h
struct A {};
struct B {
int Y;
};
struct C {
typedef int N;
};
struct D {
typedef int TT;
};
void test() {
f<A>(0);
// expected-error@-1 {{no matching function for call to 'f'}}
// expected-note@#cwg398-f {{candidate template ignored: substitution failure [with T = A]: no type named 'Y' in 'cwg398::example2::A'}}
f<B>(0);
// expected-error@-1 {{no matching function for call to 'f'}}
// expected-note@#cwg398-f {{candidate template ignored: substitution failure [with T = B]: typename specifier refers to non-type member 'Y' in 'cwg398::example2::B'}}
g<C>(0);
// expected-error@-1 {{no matching function for call to 'g'}}
// expected-note@#cwg398-g {{candidate template ignored: substitution failure [with T = C]: missing 'typename' prior to dependent type name 'C::N'}}
h<D>(0);
// expected-error@-1 {{no matching function for call to 'h'}}
// expected-note@#cwg398-h {{candidate template ignored: substitution failure [with T = D]: 'TT' following the 'template' keyword does not refer to a template}}
}
}
}
namespace cwg399 { // cwg399: 11
// NB: reuse cwg244 test
struct B {}; // #cwg399-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 'cwg399::B' in object destruction expression does not match the type 'D' of the object being destroyed}}
// expected-note@#cwg399-B {{type 'cwg399::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->cwg399::~B();
// expected-error@-1 {{no member named '~B' in namespace 'cwg399'}}
B_ptr->cwg399::~B_alias();
// expected-error@-1 {{no member named '~B' in namespace 'cwg399'}}
}
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->cwg399::~B();
// expected-error@-1 {{'cwg399' does not refer to a type name in pseudo-destructor expression; expected the name of type 'T'}}
B_ptr->cwg399::~B_alias();
// expected-error@-1 {{'cwg399' 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; // #cwg399-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@#cwg399-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->::cwg399::QualifiedLookupInScope::N::S<U>::Inner::~T();
// expected-error@-1 {{no type named 'T' in 'cwg399::QualifiedLookupInScope::N::S<int>'}}
// expected-note@#cwg399-f {{in instantiation of function template specialization 'cwg399::QualifiedLookupInScope::f<int>' requested here}}
}
template void f<int>(N::S<int>::Inner *); // #cwg399-f
template <typename U> void g(U *p) {
typedef U T;
p->T::~T();
p->U::~T();
p->::cwg399::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 *);
}
}
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