// RUN: %clang_cc1 -std=c++98 -triple x86_64-unknown-unknown %s -verify=expected,cxx98 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++11 -triple x86_64-unknown-unknown %s -verify=expected,cxx11-20,since-cxx11,cxx11-14 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++14 -triple x86_64-unknown-unknown %s -verify=expected,cxx11-20,since-cxx11,cxx11-14,cxx14-17 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++17 -triple x86_64-unknown-unknown %s -verify=expected,cxx11-20,since-cxx11,since-cxx17 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-unknown %s -verify=expected,cxx11-20,since-cxx20,since-cxx11,since-cxx17 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++23 -triple x86_64-unknown-unknown %s -verify=expected,since-cxx23,since-cxx20,since-cxx11,since-cxx17 -fexceptions -fcxx-exceptions -pedantic-errors
// RUN: %clang_cc1 -std=c++2c -triple x86_64-unknown-unknown %s -verify=expected,since-cxx23,since-cxx20,since-cxx11,since-cxx17 -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
namespace cwg1512 { // cwg1512: 4
void f(char *p) {
if (p > 0) {}
// expected-error@-1 {{ordered comparison between pointer and zero ('char *' and 'int')}}
#if __cplusplus >= 201103L
if (p > nullptr) {}
// since-cxx11-error@-1 {{invalid operands to binary expression ('char *' and 'std::nullptr_t')}}
#endif
}
bool g(int **x, const int **y) {
return x < y;
}
template<typename T> T val();
template<typename A, typename B, typename C> void composite_pointer_type_is_base() {
typedef __typeof(true ? val<A>() : val<B>()) type;
typedef C type;
typedef __typeof(val<A>() == val<B>()) cmp;
typedef __typeof(val<A>() != val<B>()) cmp;
typedef bool cmp;
}
template<typename A, typename B, typename C> void composite_pointer_type_is_ord() {
composite_pointer_type_is_base<A, B, C>();
typedef __typeof(val<A>() < val<B>()) cmp; // #cwg1512-lt
// since-cxx17-warning@#cwg1512-lt {{ordered comparison of function pointers ('int (*)() noexcept' and 'int (*)()')}}
// since-cxx17-note@#cwg1512-noexcept-1st {{in instantiation of function template specialization 'cwg1512::composite_pointer_type_is_ord<int (*)() noexcept, int (*)(), int (*)()>' requested here}}
// since-cxx17-warning@#cwg1512-lt {{ordered comparison of function pointers ('int (*)()' and 'int (*)() noexcept')}}
// since-cxx17-note@#cwg1512-noexcept-2nd {{in instantiation of function template specialization 'cwg1512::composite_pointer_type_is_ord<int (*)(), int (*)() noexcept, int (*)()>' requested here}}
typedef __typeof(val<A>() <= val<B>()) cmp;
// since-cxx17-warning@-1 {{ordered comparison of function pointers ('int (*)() noexcept' and 'int (*)()')}}
// since-cxx17-warning@-2 {{ordered comparison of function pointers ('int (*)()' and 'int (*)() noexcept')}}
typedef __typeof(val<A>() > val<B>()) cmp;
// since-cxx17-warning@-1 {{ordered comparison of function pointers ('int (*)() noexcept' and 'int (*)()')}}
// since-cxx17-warning@-2 {{ordered comparison of function pointers ('int (*)()' and 'int (*)() noexcept')}}
typedef __typeof(val<A>() >= val<B>()) cmp;
// since-cxx17-warning@-1 {{ordered comparison of function pointers ('int (*)() noexcept' and 'int (*)()')}}
// since-cxx17-warning@-2 {{ordered comparison of function pointers ('int (*)()' and 'int (*)() noexcept')}}
typedef bool cmp;
}
template <typename A, typename B, typename C>
void composite_pointer_type_is_unord(int = 0) {
composite_pointer_type_is_base<A, B, C>();
}
template <typename A, typename B, typename C>
void composite_pointer_type_is_unord(__typeof(val<A>() < val<B>()) * = 0);
template <typename A, typename B, typename C>
void composite_pointer_type_is_unord(__typeof(val<A>() <= val<B>()) * = 0);
template <typename A, typename B, typename C>
void composite_pointer_type_is_unord(__typeof(val<A>() > val<B>()) * = 0);
template <typename A, typename B, typename C>
void composite_pointer_type_is_unord(__typeof(val<A>() >= val<B>()) * = 0);
// A call to this is ambiguous if a composite pointer type exists.
template<typename A, typename B>
void no_composite_pointer_type(__typeof((true ? val<A>() : val<B>()), void()) * = 0);
template<typename A, typename B> void no_composite_pointer_type(int = 0);
struct A {};
struct B : A {};
struct C {};
void test() {
#if __cplusplus >= 201103L
using nullptr_t = decltype(nullptr);
composite_pointer_type_is_unord<nullptr_t, nullptr_t, nullptr_t>();
no_composite_pointer_type<nullptr_t, int>();
composite_pointer_type_is_unord<nullptr_t, const char**, const char**>();
composite_pointer_type_is_unord<const char**, nullptr_t, const char**>();
#endif
composite_pointer_type_is_ord<const int *, volatile void *, const volatile void*>();
composite_pointer_type_is_ord<const void *, volatile int *, const volatile void*>();
composite_pointer_type_is_ord<const A*, volatile B*, const volatile A*>();
composite_pointer_type_is_ord<const B*, volatile A*, const volatile A*>();
composite_pointer_type_is_unord<const int *A::*, volatile int *B::*, const volatile int *const B::*>();
composite_pointer_type_is_unord<const int *B::*, volatile int *A::*, const volatile int *const B::*>();
no_composite_pointer_type<int (A::*)(), int (C::*)()>();
no_composite_pointer_type<const int (A::*)(), volatile int (C::*)()>();
// since-cxx20-warning@-1 {{volatile-qualified return type 'volatile int' is deprecated}}
#if __cplusplus >= 201703L
composite_pointer_type_is_ord<int (*)() noexcept, int (*)(), int (*)()>(); // #cwg1512-noexcept-1st
composite_pointer_type_is_ord<int (*)(), int (*)() noexcept, int (*)()>(); // #cwg1512-noexcept-2nd
composite_pointer_type_is_unord<int (A::*)() noexcept, int (A::*)(), int (A::*)()>();
composite_pointer_type_is_unord<int (A::*)(), int (A::*)() noexcept, int (A::*)()>();
// FIXME: This looks like a standard defect; these should probably all have type 'int (B::*)()'.
composite_pointer_type_is_unord<int (B::*)(), int (A::*)() noexcept, int (B::*)()>();
composite_pointer_type_is_unord<int (A::*)() noexcept, int (B::*)(), int (B::*)()>();
composite_pointer_type_is_unord<int (B::*)() noexcept, int (A::*)(), int (B::*)()>();
composite_pointer_type_is_unord<int (A::*)(), int (B::*)() noexcept, int (B::*)()>();
// FIXME: It would be reasonable to permit these, with a common type of 'int (*const *)()'.
no_composite_pointer_type<int (**)() noexcept, int (**)()>();
no_composite_pointer_type<int (**)(), int (**)() noexcept>();
// FIXME: It would be reasonable to permit these, with a common type of 'int (A::*)()'.
no_composite_pointer_type<int (A::*)() const, int (A::*)()>();
no_composite_pointer_type<int (A::*)(), int (A::*)() const>();
// FIXME: It would be reasonable to permit these, with a common type of
// 'int (A::*)() &' and 'int (A::*)() &&', respectively.
no_composite_pointer_type<int (A::*)() &, int (A::*)()>();
no_composite_pointer_type<int (A::*)(), int (A::*)() &>();
no_composite_pointer_type<int (A::*)() &&, int (A::*)()>();
no_composite_pointer_type<int (A::*)(), int (A::*)() &&>();
no_composite_pointer_type<int (A::*)() &&, int (A::*)() &>();
no_composite_pointer_type<int (A::*)() &, int (A::*)() &&>();
no_composite_pointer_type<int (C::*)(), int (A::*)() noexcept>();
no_composite_pointer_type<int (A::*)() noexcept, int (C::*)()>();
#endif
}
#if __cplusplus >= 201103L
template<typename T> struct Wrap { operator T(); }; // #cwg1512-Wrap
void test_overload() {
using nullptr_t = decltype(nullptr);
void(Wrap<nullptr_t>() == Wrap<nullptr_t>());
void(Wrap<nullptr_t>() != Wrap<nullptr_t>());
void(Wrap<nullptr_t>() < Wrap<nullptr_t>());
// since-cxx11-error@-1 {{invalid operands to binary expression ('Wrap<nullptr_t>' (aka 'Wrap<std::nullptr_t>') and 'Wrap<nullptr_t>' (aka 'Wrap<std::nullptr_t>'))}}
void(Wrap<nullptr_t>() > Wrap<nullptr_t>());
// since-cxx11-error@-1 {{invalid operands to binary expression ('Wrap<nullptr_t>' (aka 'Wrap<std::nullptr_t>') and 'Wrap<nullptr_t>' (aka 'Wrap<std::nullptr_t>'))}}
void(Wrap<nullptr_t>() <= Wrap<nullptr_t>());
// since-cxx11-error@-1 {{invalid operands to binary expression ('Wrap<nullptr_t>' (aka 'Wrap<std::nullptr_t>') and 'Wrap<nullptr_t>' (aka 'Wrap<std::nullptr_t>'))}}
void(Wrap<nullptr_t>() >= Wrap<nullptr_t>());
// since-cxx11-error@-1 {{invalid operands to binary expression ('Wrap<nullptr_t>' (aka 'Wrap<std::nullptr_t>') and 'Wrap<nullptr_t>' (aka 'Wrap<std::nullptr_t>'))}}
// Under cwg1213, this is ill-formed: we select the builtin operator<(int*, int*)
// but then only convert as far as 'nullptr_t', which we then can't convert to 'int*'.
void(Wrap<nullptr_t>() == Wrap<int*>());
void(Wrap<nullptr_t>() != Wrap<int*>());
void(Wrap<nullptr_t>() < Wrap<int*>());
// since-cxx11-error@-1 {{invalid operands to binary expression ('Wrap<nullptr_t>' (aka 'Wrap<std::nullptr_t>') and 'Wrap<int *>')}}
// since-cxx11-note@#cwg1512-Wrap {{first operand was implicitly converted to type 'std::nullptr_t'}}
// since-cxx11-note@#cwg1512-Wrap {{second operand was implicitly converted to type 'int *'}}
void(Wrap<nullptr_t>() > Wrap<int*>());
// since-cxx11-error@-1 {{invalid operands}}
// since-cxx11-note@#cwg1512-Wrap {{first operand was implicitly converted to type 'std::nullptr_t'}}
// since-cxx11-note@#cwg1512-Wrap{{second operand was implicitly converted to type 'int *'}}
void(Wrap<nullptr_t>() <= Wrap<int*>());
// since-cxx11-error@-1 {{invalid operands}}
// since-cxx11-note@#cwg1512-Wrap {{first operand was implicitly converted to type 'std::nullptr_t'}}
// since-cxx11-note@#cwg1512-Wrap {{second operand was implicitly converted to type 'int *'}}
void(Wrap<nullptr_t>() >= Wrap<int*>());
// since-cxx11-error@-1 {{invalid operands}}
// since-cxx11-note@#cwg1512-Wrap {{first operand was implicitly converted to type 'std::nullptr_t'}}
// since-cxx11-note@#cwg1512-Wrap {{second operand was implicitly converted to type 'int *'}}
}
#endif
}
namespace cwg1514 { // cwg1514: 11
#if __cplusplus >= 201103L
struct S {
enum E : int {}; // #cwg1514-E
enum E : int {};
// since-cxx11-error@-1 {{redefinition of 'E'}}
// since-cxx11-note@#cwg1514-E {{previous definition is here}}
};
S::E se; // OK, complete type, not zero-width bitfield.
// The behavior in other contexts is superseded by CWG1966.
#endif
}
namespace cwg1518 { // cwg1518: 4
#if __cplusplus >= 201103L
struct Z0 { // #cwg1518-Z0
explicit Z0() = default; // #cwg1518-Z0-ctor
};
struct Z { // #cwg1518-Z
explicit Z(); // #cwg1518-Z-ctor
explicit Z(int); // #cwg1518-Z-int
explicit Z(int, int); // #cwg1518-Z-int-int
};
template <class T> int Eat(T); // #cwg1518-Eat
Z0 a;
Z0 b{};
Z0 c = {};
// since-cxx11-error@-1 {{chosen constructor is explicit in copy-initialization}}
// since-cxx11-note@#cwg1518-Z0-ctor {{explicit constructor declared here}}
int i = Eat<Z0>({});
// since-cxx11-error@-1 {{no matching function for call to 'Eat'}}
// since-cxx11-note@#cwg1518-Eat {{candidate function template not viable: cannot convert initializer list argument to 'Z0'}}
Z c2 = {};
// since-cxx11-error@-1 {{chosen constructor is explicit in copy-initialization}}
// since-cxx11-note@#cwg1518-Z-ctor {{explicit constructor declared here}}
int i2 = Eat<Z>({});
// since-cxx11-error@-1 {{no matching function for call to 'Eat'}}
// since-cxx11-note@#cwg1518-Eat {{candidate function template not viable: cannot convert initializer list argument to 'Z'}}
Z a1 = 1;
// since-cxx11-error@-1 {{no viable conversion from 'int' to 'Z'}}
// since-cxx11-note@#cwg1518-Z {{candidate constructor (the implicit copy constructor) not viable: no known conversion from 'int' to 'const Z &' for 1st argument}}
// since-cxx11-note@#cwg1518-Z {{candidate constructor (the implicit move constructor) not viable: no known conversion from 'int' to 'Z &&' for 1st argument}}
// since-cxx11-note@#cwg1518-Z-int {{explicit constructor is not a candidate}}
Z a3 = Z(1);
Z a2(1);
Z *p = new Z(1);
Z a4 = (Z)1;
Z a5 = static_cast<Z>(1);
Z a6 = {4, 3};
// since-cxx11-error@-1 {{chosen constructor is explicit in copy-initialization}}
// since-cxx11-note@#cwg1518-Z-int-int {{explicit constructor declared here}}
struct UserProvidedBaseCtor { // #cwg1518-U
UserProvidedBaseCtor() {}
};
struct DoesntInheritCtor : UserProvidedBaseCtor { // #cwg1518-D-U
int x;
};
DoesntInheritCtor I{{}, 42};
// cxx11-14-error@-1 {{no matching constructor for initialization of 'DoesntInheritCtor'}}
// cxx11-14-note@#cwg1518-D-U {{candidate constructor (the implicit copy constructor) not viable: requires 1 argument, but 2 were provided}}
// cxx11-14-note@#cwg1518-D-U {{candidate constructor (the implicit move constructor) not viable: requires 1 argument, but 2 were provided}}
// cxx11-14-note@#cwg1518-D-U {{candidate constructor (the implicit default constructor) not viable: requires 0 arguments, but 2 were provided}}
struct BaseCtor { BaseCtor() = default; }; // #cwg1518-BC
struct InheritsCtor : BaseCtor { // #cwg1518-I
using BaseCtor::BaseCtor; // #cwg1518-I-using
int x;
};
InheritsCtor II = {{}, 42};
// since-cxx11-error@-1 {{no matching constructor for initialization of 'InheritsCtor'}}
// since-cxx11-note@#cwg1518-BC {{candidate constructor (the implicit copy constructor) not viable: requires 1 argument, but 2 were provided}}
// since-cxx11-note@#cwg1518-I-using {{constructor from base class 'BaseCtor' inherited here}}
// since-cxx11-note@#cwg1518-BC {{candidate constructor (the implicit move constructor) not viable: requires 1 argument, but 2 were provided}}
// since-cxx11-note@#cwg1518-I-using {{constructor from base class 'BaseCtor' inherited here}}
// since-cxx11-note@#cwg1518-I {{candidate constructor (the implicit copy constructor) not viable: requires 1 argument, but 2 were provided}}
// since-cxx11-note@#cwg1518-I {{candidate constructor (the implicit move constructor) not viable: requires 1 argument, but 2 were provided}}
// since-cxx11-note@#cwg1518-I {{candidate constructor (the implicit default constructor) not viable: requires 0 arguments, but 2 were provided}}
namespace std_example {
struct A {
explicit A() = default; // #cwg1518-A
};
struct B : A {
explicit B() = default; // #cwg1518-B
};
struct C {
explicit C(); // #cwg1518-C
};
struct D : A {
C c;
explicit D() = default; // #cwg1518-D
};
template <typename T> void f() {
T t; // ok
T u{}; // ok
T v = {}; // #cwg1518-v
// since-cxx11-error@#cwg1518-v {{chosen constructor is explicit in copy-initialization}}
// since-cxx11-note@#cwg1518-f-A {{in instantiation of function template specialization 'cwg1518::std_example::f<cwg1518::std_example::A>' requested here}}
// since-cxx11-note@#cwg1518-A {{explicit constructor declared here}}
// since-cxx11-error@#cwg1518-v {{chosen constructor is explicit in copy-initialization}}
// since-cxx11-note@#cwg1518-f-B {{in instantiation of function template specialization 'cwg1518::std_example::f<cwg1518::std_example::B>' requested here}}
// since-cxx11-note@#cwg1518-B {{explicit constructor declared here}}
// since-cxx11-error@#cwg1518-v {{chosen constructor is explicit in copy-initialization}}
// since-cxx11-note@#cwg1518-f-C {{in instantiation of function template specialization 'cwg1518::std_example::f<cwg1518::std_example::C>' requested here}}
// since-cxx11-note@#cwg1518-C {{explicit constructor declared here}}
// since-cxx11-error@#cwg1518-v {{chosen constructor is explicit in copy-initialization}}
// since-cxx11-note@#cwg1518-f-D {{in instantiation of function template specialization 'cwg1518::std_example::f<cwg1518::std_example::D>' requested here}}
// since-cxx11-note@#cwg1518-D {{explicit constructor declared here}}
}
template <typename T> void g() {
void x(T t); // #cwg1518-x
x({}); // #cwg1518-x-call
// since-cxx11-error@#cwg1518-x-call {{chosen constructor is explicit in copy-initialization}}
// since-cxx11-note@#cwg1518-g-A {{in instantiation of function template specialization 'cwg1518::std_example::g<cwg1518::std_example::A>' requested here}}
// since-cxx11-note@#cwg1518-A {{explicit constructor declared here}}
// since-cxx11-note@#cwg1518-x {{passing argument to parameter 't' here}}
// since-cxx11-error@#cwg1518-x-call {{chosen constructor is explicit in copy-initialization}}
// since-cxx11-note@#cwg1518-g-B {{in instantiation of function template specialization 'cwg1518::std_example::g<cwg1518::std_example::B>' requested here}}
// since-cxx11-note@#cwg1518-B {{explicit constructor declared here}}
// since-cxx11-note@#cwg1518-x {{passing argument to parameter 't' here}}
// since-cxx11-error@#cwg1518-x-call {{chosen constructor is explicit in copy-initialization}}
// since-cxx11-note@#cwg1518-g-C {{in instantiation of function template specialization 'cwg1518::std_example::g<cwg1518::std_example::C>' requested here}}
// since-cxx11-note@#cwg1518-C {{explicit constructor declared here}}
// since-cxx11-note@#cwg1518-x {{passing argument to parameter 't' here}}
// since-cxx11-error@#cwg1518-x-call {{chosen constructor is explicit in copy-initialization}}
// since-cxx11-note@#cwg1518-g-D {{in instantiation of function template specialization 'cwg1518::std_example::g<cwg1518::std_example::D>' requested here}}
// since-cxx11-note@#cwg1518-D {{explicit constructor declared here}}
// since-cxx11-note@#cwg1518-x {{passing argument to parameter 't' here}}
}
void test() {
f<A>(); // #cwg1518-f-A
f<B>(); // #cwg1518-f-B
f<C>(); // #cwg1518-f-C
f<D>(); // #cwg1518-f-D
g<A>(); // #cwg1518-g-A
g<B>(); // #cwg1518-g-B
g<C>(); // #cwg1518-g-C
g<D>(); // #cwg1518-g-D
}
}
#endif // __cplusplus >= 201103L
}
namespace cwg1550 { // cwg1550: 3.4
int f(bool b, int n) {
return (b ? (throw 0) : n) + (b ? n : (throw 0));
}
}
namespace cwg1558 { // cwg1558: 12
#if __cplusplus >= 201103L
template<class T, class...> using first_of = T;
template<class T> first_of<void, typename T::type> f(int); // #cwg1558-f
template<class T> void f(...) = delete; // #cwg1558-f-deleted
struct X { typedef void type; };
void test() {
f<X>(0);
f<int>(0);
// since-cxx11-error@-1 {{call to deleted function 'f'}}
// since-cxx11-note@#cwg1558-f-deleted {{candidate function [with T = int] has been explicitly deleted}}
// since-cxx11-note@#cwg1558-f {{candidate template ignored: substitution failure [with T = int]: type 'int' cannot be used prior to '::' because it has no members}}
}
#endif
}
namespace cwg1560 { // cwg1560: 3.5
void f(bool b, int n) {
(b ? throw 0 : n) = (b ? n : throw 0) = 0;
}
class X { X(const X&); };
const X &get();
const X &x = true ? get() : throw 0;
}
namespace cwg1563 { // cwg1563: yes
#if __cplusplus >= 201103L
double bar(double) { return 0.0; }
float bar(float) { return 0.0f; }
using fun = double(double);
fun &foo{bar}; // ok
#endif
}
namespace cwg1567 { // cwg1567: 3.3
#if __cplusplus >= 201103L
struct B;
struct A {
A(const A&);
A(const B&) = delete;
A(A&&);
A(B&&) = delete;
A(int); // #cwg1567-A-int
};
struct B: A { // #cwg1567-B
using A::A; // #cwg1567-using-A
B(double); // #cwg1567-B-double
};
A a{0};
B b{1.0};
// Good, deleted converting ctors are not inherited as copy/move ctors
B b2{b};
B b3{B{1.0}};
// Good, copy/move ctors are not inherited
B b4{a};
// since-cxx11-error@-1 {{no matching constructor for initialization of 'B'}}
// since-cxx11-note@#cwg1567-A-int {{candidate inherited constructor not viable: no known conversion from 'A' to 'int' for 1st argument}}
// since-cxx11-note@#cwg1567-using-A {{constructor from base class 'A' inherited here}}
// since-cxx11-note@#cwg1567-B {{candidate constructor (the implicit copy constructor) not viable: no known conversion from 'A' to 'const B' for 1st argument}}
// since-cxx11-note@#cwg1567-B {{candidate constructor (the implicit move constructor) not viable: no known conversion from 'A' to 'B' for 1st argument}}
// since-cxx11-note@#cwg1567-B-double {{candidate constructor not viable: no known conversion from 'A' to 'double' for 1st argument}}
B b5{A{0}};
// since-cxx11-error@-1 {{no matching constructor for initialization of 'B'}}
// since-cxx11-note@#cwg1567-A-int {{candidate inherited constructor not viable: no known conversion from 'A' to 'int' for 1st argument}}
// since-cxx11-note@#cwg1567-using-A {{constructor from base class 'A' inherited here}}
// since-cxx11-note@#cwg1567-B {{candidate constructor (the implicit copy constructor) not viable: no known conversion from 'A' to 'const B' for 1st argument}}
// since-cxx11-note@#cwg1567-B {{candidate constructor (the implicit move constructor) not viable: no known conversion from 'A' to 'B' for 1st argument}}
// since-cxx11-note@#cwg1567-B-double {{candidate constructor not viable: no known conversion from 'A' to 'double' for 1st argument}}
#endif
}
namespace cwg1573 { // cwg1573: 3.9
#if __cplusplus >= 201103L
// ellipsis is inherited (p0136r1 supersedes this part).
struct A { A(); A(int, char, ...); };
struct B : A { using A::A; };
B b(1, 'x', 4.0, "hello"); // ok
// inherited constructor is effectively constexpr if the user-written constructor would be
struct C { C(); constexpr C(int) {} }; // #cwg1573-C
struct D : C { using C::C; };
constexpr D d = D(0); // ok
struct E : C { using C::C; A a; }; // #cwg1573-E
constexpr E e = E(0);
// since-cxx11-error@-1 {{constexpr variable cannot have non-literal type 'const E'}}
// since-cxx11-note@#cwg1573-E {{'E' is not literal because it has data member 'a' of non-literal type 'A'}}
// FIXME: This diagnostic is pretty bad; we should explain that the problem
// is that F::c would be initialized by a non-constexpr constructor.
struct F : C { using C::C; C c; }; // #cwg1573-F
constexpr F f = F(0);
// since-cxx11-error@-1 {{constexpr variable 'f' must be initialized by a constant expression}}
// cxx11-20-note@-2 {{constructor inherited from base class 'C' cannot be used in a constant expression; derived class cannot be implicitly initialized}}
// since-cxx23-note@-3 {{in implicit initialization for inherited constructor of 'F'}}
// since-cxx23-note@#cwg1573-F {{non-constexpr constructor 'C' cannot be used in a constant expression}}
// cxx11-20-note@#cwg1573-F {{declared here}}
// since-cxx23-note@#cwg1573-C {{declared here}}
// inherited constructor is effectively deleted if the user-written constructor would be
struct G { G(int); };
struct H : G { using G::G; G g; }; // #cwg1573-H
H h(0);
// since-cxx11-error@-1 {{constructor inherited by 'H' from base class 'G' is implicitly deleted}}
// since-cxx11-note@#cwg1573-H {{constructor inherited by 'H' is implicitly deleted because field 'g' has no default constructor}}
// deleted definition of constructor is inherited
struct I { I(int) = delete; }; // #cwg1573-I
struct J : I { using I::I; };
J j(0);
// since-cxx11-error@-1 {{call to deleted constructor of 'J'}}
// since-cxx11-note@#cwg1573-I {{'I' has been explicitly marked deleted here}}
#endif
}
#if __cplusplus >= 201103L
namespace std {
typedef decltype(sizeof(int)) size_t;
// libc++'s implementation
template <class _E>
class initializer_list
{
const _E* __begin_;
size_t __size_;
initializer_list(const _E* __b, size_t __s)
: __begin_(__b), __size_(__s) {}
public:
typedef _E value_type;
typedef const _E& reference;
typedef const _E& const_reference;
typedef size_t size_type;
typedef const _E* iterator;
typedef const _E* const_iterator;
initializer_list() : __begin_(nullptr), __size_(0) {}
size_t size() const {return __size_;}
const _E* begin() const {return __begin_;}
const _E* end() const {return __begin_ + __size_;}
};
template < class _T1, class _T2 > struct pair { _T2 second; };
template<typename T> struct basic_string {
basic_string(const T* x) {}
~basic_string() {};
};
typedef basic_string<char> string;
} // std
#endif
namespace cwg1579 { // cwg1579: 3.9
#if __cplusplus >= 201103L
template<class T>
struct GenericMoveOnly {
GenericMoveOnly();
template<class U> GenericMoveOnly(const GenericMoveOnly<U> &) = delete; // #cwg1579-deleted-U
GenericMoveOnly(const int &) = delete; // #cwg1579-deleted-int
template<class U> GenericMoveOnly(GenericMoveOnly<U> &&);
GenericMoveOnly(int &&);
};
GenericMoveOnly<float> CWG1579_Eligible(GenericMoveOnly<char> CharMO) {
int i;
GenericMoveOnly<char> GMO;
if (0)
return i;
else if (0)
return GMO;
else if (0)
return ((GMO));
else
return CharMO;
}
GenericMoveOnly<char> GlobalMO;
GenericMoveOnly<float> CWG1579_Ineligible(int &AnInt,
GenericMoveOnly<char> &CharMO) {
static GenericMoveOnly<char> StaticMove;
extern GenericMoveOnly<char> ExternMove;
if (0)
return AnInt;
// since-cxx11-error@-1 {{conversion function from 'int' to 'GenericMoveOnly<float>' invokes a deleted function}}
// since-cxx11-note@#cwg1579-deleted-int {{'GenericMoveOnly' has been explicitly marked deleted here}}
else if (0)
return GlobalMO;
// since-cxx11-error@-1 {{conversion function from 'GenericMoveOnly<char>' to 'GenericMoveOnly<float>' invokes a deleted function}}
// since-cxx11-note@#cwg1579-deleted-U {{'GenericMoveOnly<char>' has been explicitly marked deleted here}}
else if (0)
return StaticMove;
// since-cxx11-error@-1 {{conversion function from 'GenericMoveOnly<char>' to 'GenericMoveOnly<float>' invokes a deleted function}}
// since-cxx11-note@#cwg1579-deleted-U {{'GenericMoveOnly<char>' has been explicitly marked deleted here}}
else if (0)
return ExternMove;
// since-cxx11-error@-1 {{conversion function from 'GenericMoveOnly<char>' to 'GenericMoveOnly<float>' invokes a deleted function}}
// since-cxx11-note@#cwg1579-deleted-U {{'GenericMoveOnly<char>' has been explicitly marked deleted here}}
else if (0)
return AnInt;
// since-cxx11-error@-1 {{conversion function from 'int' to 'GenericMoveOnly<float>' invokes a deleted function}}
// since-cxx11-note@#cwg1579-deleted-int {{'GenericMoveOnly' has been explicitly marked deleted here}}
else
return CharMO;
// since-cxx11-error@-1 {{conversion function from 'GenericMoveOnly<char>' to 'GenericMoveOnly<float>' invokes a deleted function}}
// since-cxx11-note@#cwg1579-deleted-U {{'GenericMoveOnly<char>' has been explicitly marked deleted here}}
}
auto CWG1579_lambda_valid = [](GenericMoveOnly<float> mo) ->
GenericMoveOnly<char> {
return mo;
};
auto CWG1579_lambda_invalid = []() -> GenericMoveOnly<char> {
static GenericMoveOnly<float> mo;
return mo;
// since-cxx11-error@-1 {{conversion function from 'GenericMoveOnly<float>' to 'GenericMoveOnly<char>' invokes a deleted function}}
// since-cxx11-note@#cwg1579-deleted-U {{'GenericMoveOnly<float>' has been explicitly marked deleted here}}
};
#endif
} // end namespace cwg1579
namespace cwg1584 { // cwg1584: 7 drafting 2015-05
// Deducing function types from cv-qualified types
template<typename T> void f(const T *); // #cwg1584-f
template<typename T> void g(T *, const T * = 0);
template<typename T> void h(T *) { T::error; }
// expected-error@-1 {{type 'void ()' cannot be used prior to '::' because it has no members}}
// expected-note@#cwg1584-h {{in instantiation of function template specialization 'cwg1584::h<void ()>' requested here}}
template<typename T> void h(const T *);
void i() {
f(&i);
// expected-error@-1 {{no matching function for call to 'f'}}
// expected-note@#cwg1584-f {{candidate template ignored: could not match 'const T *' against 'void (*)()'}}
g(&i);
h(&i); // #cwg1584-h
}
template<typename T> struct tuple_size {
static const bool is_primary = true;
};
template<typename T> struct tuple_size<T const> : tuple_size<T> {
static const bool is_primary = false;
};
tuple_size<void()> t;
static_assert(tuple_size<void()>::is_primary, "");
static_assert(tuple_size<void()const>::is_primary, "");
} // namespace cwg1584
namespace cwg1589 { // cwg1589: 3.7 c++11
#if __cplusplus >= 201103L
// Ambiguous ranking of list-initialization sequences
void f0(long, int=0); // Would makes selection of #0 ambiguous
void f0(long); // #0
void f0(std::initializer_list<int>); // #00
void g0() { f0({1L}); } // chooses #00
void f1(int, int=0); // Would make selection of #1 ambiguous
void f1(int); // #1
void f1(std::initializer_list<long>); // #2
void g1() { f1({42}); } // chooses #2
void f2(std::pair<const char*, const char*>, int = 0); // Would makes selection of #3 ambiguous
void f2(std::pair<const char*, const char*>); // #3
void f2(std::initializer_list<std::string>); // #4
void g2() { f2({"foo","bar"}); } // chooses #4
namespace with_error {
void f0(long);
void f0(std::initializer_list<int>); // #cwg1589-f0-ilist
void f0(std::initializer_list<int>, int = 0); // #cwg1589-f0-ilist-int
void g0() { f0({1L}); }
// since-cxx11-error@-1 {{call to 'f0' is ambiguous}}
// since-cxx11-note@#cwg1589-f0-ilist {{candidate function}}
// since-cxx11-note@#cwg1589-f0-ilist-int {{candidate function}}
void f1(int);
void f1(std::initializer_list<long>); // #cwg1589-f1-ilist
void f1(std::initializer_list<long>, int = 0); // #cwg1589-f1-ilist-long
void g1() { f1({42}); }
// since-cxx11-error@-1 {{call to 'f1' is ambiguous}}
// since-cxx11-note@#cwg1589-f1-ilist {{candidate function}}
// since-cxx11-note@#cwg1589-f1-ilist-long {{candidate function}}
void f2(std::pair<const char*, const char*>);
void f2(std::initializer_list<std::string>); // #cwg1589-f2-ilist
void f2(std::initializer_list<std::string>, int = 0); // #cwg1589-f2-ilist-int
void g2() { f2({"foo","bar"}); }
// since-cxx11-error@-1 {{call to 'f2' is ambiguous}}
// since-cxx11-note@#cwg1589-f2-ilist {{candidate function}}
// since-cxx11-note@#cwg1589-f2-ilist-int {{candidate function}}
}
#endif
} // cwg1589
namespace cwg1591 { //cwg1591. Deducing array bound and element type from initializer list
#if __cplusplus >= 201103L
template<class T, int N> int h(T const(&)[N]);
int X = h({1,2,3}); // T deduced to int, N deduced to 3
template<class T> int j(T const(&)[3]);
int Y = j({42}); // T deduced to int, array bound not considered
struct Aggr { int i; int j; };
template<int N> int k(Aggr const(&)[N]); // #cwg1591-k
int Y0 = k({1,2,3});
// since-cxx11-error@-1 {{no matching function for call to 'k'}}
// since-cxx11-note@#cwg1591-k {{candidate function [with N = 3] not viable: no known conversion from 'int' to 'const Aggr' for 1st argument}}
int Z = k({{1},{2},{3}}); // OK, N deduced to 3
template<int M, int N> int m(int const(&)[M][N]);
int X0 = m({{1,2},{3,4}}); // M and N both deduced to 2
template<class T, int N> int n(T const(&)[N], T);
int X1 = n({{1},{2},{3}},Aggr()); // OK, T is Aggr, N is 3
namespace check_multi_dim_arrays {
template<class T, int N, int M, int O> int ***f(const T (&a)[N][M][O]); // #cwg1591-f-3
template<class T, int N, int M> int **f(const T (&a)[N][M]); // #cwg1591-f-2
template<class T, int N> int *f(const T (&a)[N]); // #cwg1591-f-1
int ***p3 = f({ { {1,2}, {3, 4} }, { {5,6}, {7, 8} }, { {9,10}, {11, 12} } });
int ***p33 = f({ { {1,2}, {3, 4} }, { {5,6}, {7, 8} }, { {9,10}, {11, 12, 13} } });
// since-cxx11-error@-1 {{no matching function for call to 'f'}}
// since-cxx11-note@#cwg1591-f-2 {{candidate template ignored: couldn't infer template argument 'T'}}
// since-cxx11-note@#cwg1591-f-1 {{candidate template ignored: couldn't infer template argument 'T'}}
// since-cxx11-note@#cwg1591-f-3 {{candidate template ignored: deduced conflicting values for parameter 'O' (2 vs. 3)}}
int **p2 = f({ {1,2,3}, {3, 4, 5} });
int **p22 = f({ {1,2}, {3, 4} });
int *p1 = f({1, 2, 3});
}
namespace check_multi_dim_arrays_rref {
template<class T, int N, int M, int O> int ***g(T (&&a)[N][M][O]); // #cwg1591-g-3
template<class T, int N, int M> int **g(T (&&a)[N][M]); // #cwg1591-g-2
template<class T, int N> int *g(T (&&a)[N]); // #cwg1591-g-1
int ***p3 = g({ { {1,2}, {3, 4} }, { {5,6}, {7, 8} }, { {9,10}, {11, 12} } });
int ***p33 = g({ { {1,2}, {3, 4} }, { {5,6}, {7, 8} }, { {9,10}, {11, 12, 13} } });
// since-cxx11-error@-1 {{no matching function for call to 'g'}}
// since-cxx11-note@#cwg1591-g-2 {{candidate template ignored: couldn't infer template argument 'T'}}
// since-cxx11-note@#cwg1591-g-1 {{candidate template ignored: couldn't infer template argument 'T'}}
// since-cxx11-note@#cwg1591-g-3 {{candidate template ignored: deduced conflicting values for parameter 'O' (2 vs. 3)}}
int **p2 = g({ {1,2,3}, {3, 4, 5} });
int **p22 = g({ {1,2}, {3, 4} });
int *p1 = g({1, 2, 3});
}
namespace check_arrays_of_init_list {
template<class T, int N> float *h(const std::initializer_list<T> (&)[N]);
template<class T, int N> double *h(const T(&)[N]);
double *p = h({1, 2, 3});
float *fp = h({{1}, {1, 2}, {1, 2, 3}});
}
namespace core_reflector_28543 {
template<class T, int N> int *i(T (&&)[N]); // #1
template<class T> char *i(std::initializer_list<T> &&); // #2
template<class T, int N, int M> int **i(T (&&)[N][M]); // #3 #cwg1591-i-2
template<class T, int N> char **i(std::initializer_list<T> (&&)[N]); // #4 #cwg1591-i-1
template<class T> short *i(T (&&)[2]); // #5
template<class T> using Arr = T[];
char *pc = i({1, 2, 3}); // OK prefer #2 via 13.3.3.2 [over.ics.rank]
char *pc2 = i({1, 2}); // #2 also
int *pi = i(Arr<int>{1, 2, 3}); // OK prefer #1
void *pv1 = i({ {1, 2, 3}, {4, 5, 6} }); // ambiguous btw 3 & 4
// since-cxx11-error@-1 {{call to 'i' is ambiguous}}
// since-cxx11-note@#cwg1591-i-2 {{candidate function [with T = int, N = 2, M = 3]}}
// since-cxx11-note@#cwg1591-i-1 {{candidate function [with T = int, N = 2]}}
char **pcc = i({ {1}, {2, 3} }); // OK #4
short *ps = i(Arr<int>{1, 2}); // OK #5
}
#endif
} // cwg1591
Codebase Browser
llvm