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// RUN: %clang_cc1 -verify -std=c++20 %s -fsyntax-only
// RUN: %clang_cc1 -verify=expected,beforecxx20 -Wc++20-extensions -std=c++20 %s -fsyntax-only
struct A { // expected-note 4{{candidate constructor}}
char i;
double j;
};
struct B {
A a;
int b[20];
int &&c; // expected-note {{reference member declared here}}
};
struct C { // expected-note 5{{candidate constructor}}
A a;
int b[20];
};
struct D : public C, public A {
int a;
};
struct E { // expected-note 3{{candidate constructor}}
struct F {
F(int, int);
};
int a;
F f;
};
int getint(); // expected-note {{declared here}}
struct F {
int a;
int b = getint(); // expected-note {{non-constexpr function 'getint' cannot be used in a constant expression}}
};
template <typename T>
struct G {
T t1;
T t2;
};
struct H {
virtual void foo() = 0;
};
struct I : public H { // expected-note 3{{candidate constructor}}
int i, j;
void foo() override {}
};
struct J {
int a;
int b[]; // expected-note {{initialized flexible array member 'b' is here}}
};
union U {
int a;
char* b;
};
template <typename T, char CH>
void bar() {
T t = 0;
A a(CH, 1.1); // OK; C++ paren list constructors are supported in semantic tree transformations.
// beforecxx20-warning@-1 2{{aggregate initialization of type 'A' from a parenthesized list of values is a C++20 extension}}
}
template <class T, class... Args>
T Construct(Args... args) {
return T(args...); // OK; variadic arguments can be used in paren list initializers.
// beforecxx20-warning@-1 {{aggregate initialization of type 'A' from a parenthesized list of values is a C++20 extension}}
}
void foo() {
A a1(1954, 9, 21);
// expected-error@-1 {{excess elements in struct initializer}}
A a2(2.1);
// expected-warning@-1 {{implicit conversion from 'double' to 'char'}}
// beforecxx20-warning@-2 {{aggregate initialization of type 'A' from a parenthesized list of values is a C++20 extension}}
A a3(-1.2, 9.8);
// expected-warning@-1 {{implicit conversion from 'double' to 'char'}}
// beforecxx20-warning@-2 {{aggregate initialization of type 'A' from a parenthesized list of values is a C++20 extension}}
A a4 = static_cast<A>(1.1);
// expected-warning@-1 {{implicit conversion from 'double' to 'char'}}
// beforecxx20-warning@-2 {{aggregate initialization of type 'A' from a parenthesized list of values is a C++20 extension}}
A a5 = (A)3.1;
// expected-warning@-1 {{implicit conversion from 'double' to 'char'}}
// beforecxx20-warning@-2 {{aggregate initialization of type 'A' from a parenthesized list of values is a C++20 extension}}
A a6 = A(8.7);
// expected-warning@-1 {{implicit conversion from 'double' to 'char'}}
// beforecxx20-warning@-2 {{aggregate initialization of type 'A' from a parenthesized list of values is a C++20 extension}}
B b1(2022, {7, 8});
// expected-error@-1 {{no viable conversion from 'int' to 'A'}}
B b2(A(1), {}, 1);
// expected-error@-1 {{reference member 'c' binds to a temporary object whose lifetime would be shorter than the lifetime of the constructed object}}
// beforecxx20-warning@-2 {{aggregate initialization of type 'A' from a parenthesized list of values is a C++20 extension}}
// beforecxx20-warning@-3 {{aggregate initialization of type 'B' from a parenthesized list of values is a C++20 extension}}
C c(A(1), 1, 2, 3, 4);
// expected-error@-1 {{array initializer must be an initializer list}}
// beforecxx20-warning@-2 {{aggregate initialization of type 'A' from a parenthesized list of values is a C++20 extension}}
D d1(1);
// expected-error@-1 {{no viable conversion from 'int' to 'C'}}
D d2(C(1));
// expected-error@-1 {{no matching conversion for functional-style cast from 'int' to 'C'}}
// beforecxx20-warning@-2 {{aggregate initialization of type 'D' from a parenthesized list of values is a C++20 extension}}
D d3(C(A(1)), 1);
// expected-error@-1 {{no viable conversion from 'int' to 'A'}}
// beforecxx20-warning@-2 {{aggregate initialization of type 'A' from a parenthesized list of values is a C++20 extension}}
// beforecxx20-warning@-3 {{aggregate initialization of type 'C' from a parenthesized list of values is a C++20 extension}}
int arr1[](0, 1, 2, A(1));
// expected-error@-1 {{no viable conversion from 'A' to 'int'}}
// beforecxx20-warning@-2 {{aggregate initialization of type 'A' from a parenthesized list of values is a C++20 extension}}
int arr2[2](0, 1, 2);
// expected-error@-1 {{excess elements in array initializer}}
// We should not build paren list initilizations for IK_COPY.
int arr3[1] = 1;
// expected-error@-1 {{array initializer must be an initializer list}}
U u1("abcd");
// expected-error@-1 {{cannot initialize a member subobject of type 'int' with an lvalue of type 'const char[5]'}}
U u2(1, "efgh");
// expected-error@-1 {{excess elements in union initializer}}
E e1(1);
// expected-error@-1 {{no matching constructor for initialization of 'E'}}
constexpr F f1(1);
// expected-error@-1 {{constexpr variable 'f1' must be initialized by a constant expression}}
// beforecxx20-warning@-2 {{aggregate initialization of type 'const F' from a parenthesized list of values is a C++20 extension}}
constexpr F f2(1, 1); // OK: f2.b is initialized by a constant expression.
// beforecxx20-warning@-1 {{aggregate initialization of type 'const F' from a parenthesized list of values is a C++20 extension}}
bar<int, 'a'>();
// beforecxx20-note@-1 {{in instantiation of function template specialization 'bar<int, 'a'>' requested here}}
G<char> g('b', 'b');
// beforecxx20-warning@-1 {{aggregate initialization of type 'G<char>' from a parenthesized list of values is a C++20 extension}}
A a7 = Construct<A>('i', 2.2);
// beforecxx20-note@-1 {{in instantiation of function template specialization 'Construct<A, char, double>' requested here}}
int arr4[](1, 2);
// beforecxx20-warning@-1 {{aggregate initialization of type 'int[2]' from a parenthesized list of values is a C++20 extension}}
int arr5[2](1, 2);
// beforecxx20-warning@-1 {{aggregate initialization of type 'int[2]' from a parenthesized list of values is a C++20 extension}}
I i(1, 2);
// expected-error@-1 {{no matching constructor for initialization of 'I'}}
J j(1, {2, 3});
// expected-error@-1 {{initialization of flexible array member is not allowed}}
static_assert(__is_trivially_constructible(A, char, double));
static_assert(__is_trivially_constructible(A, char, int));
static_assert(__is_trivially_constructible(A, char));
static_assert(__is_trivially_constructible(D, C, A, int));
static_assert(__is_trivially_constructible(D, C));
static_assert(__is_trivially_constructible(int[2], int, int));
static_assert(__is_trivially_constructible(int[2], int, double));
static_assert(__is_trivially_constructible(int[2], int));
}
namespace gh59675 {
struct K {
template <typename T>
K(T);
virtual ~K();
};
union V {
K k;
// expected-note@-1 {{default constructor of 'V' is implicitly deleted because field 'k' has no default constructor}}
// expected-note@-2 2{{copy constructor of 'V' is implicitly deleted because variant field 'k' has a non-trivial copy constructor}}
};
static_assert(!__is_constructible(V, const V&));
static_assert(!__is_constructible(V, V&&));
void bar() {
V v1;
// expected-error@-1 {{call to implicitly-deleted default constructor of 'V'}}
V v2(v1);
// expected-error@-1 {{call to implicitly-deleted copy constructor of 'V'}}
V v3((V&&) v1);
// expected-error@-1 {{call to implicitly-deleted copy constructor of 'V'}}
}
}
namespace gh62296 {
struct L {
protected:
L(int);
// expected-note@-1 2{{declared protected here}}
};
struct M : L {};
struct N {
L l;
};
M m(42);
// expected-error@-1 {{base class 'L' has protected constructor}}
// beforecxx20-warning@-2 {{aggregate initialization of type 'M' from a parenthesized list of values is a C++20 extension}}
N n(43);
// expected-error@-1 {{field of type 'L' has protected constructor}}
// beforecxx20-warning@-2 {{aggregate initialization of type 'N' from a parenthesized list of values is a C++20 extension}}
}
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