blob: 25316f8d51ee5bb3fb9f50d23beeedc5c7310080 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
|
// RUN: %clang_cc1 -fsyntax-only -fcxx-exceptions -verify -std=c++11 -Wall %s
template<bool b> struct ExceptionIf { static int f(); };
template<> struct ExceptionIf<false> { typedef int f; };
// The exception specification of a defaulted default constructor depends on
// the contents of in-class member initializers. However, the in-class member
// initializers can depend on the exception specification of the constructor,
// since the class is considered complete within them. We reject any such cases.
namespace InClassInitializers {
// Noexcept::Noexcept() is implicitly declared as noexcept(false), because it
// directly invokes ThrowSomething(). However...
//
// If noexcept(Noexcept()) is false, then Noexcept() is a constant expression,
// so noexcept(Noexcept()) is true. But if noexcept(Noexcept()) is true, then
// Noexcept::Noexcept is not declared constexpr, therefore noexcept(Noexcept())
// is false.
bool ThrowSomething() noexcept(false);
struct ConstExpr {
bool b = noexcept(ConstExpr()) && ThrowSomething(); // expected-error {{exception specification is not available until end of class definition}}
};
// We can use it now.
bool w = noexcept(ConstExpr());
// Much more obviously broken: we can't parse the initializer without already
// knowing whether it produces a noexcept expression.
struct TemplateArg {
int n = ExceptionIf<noexcept(TemplateArg())>::f(); // expected-error {{exception specification is not available until end of class definition}}
};
bool x = noexcept(TemplateArg());
// And within a nested class.
struct Nested {
struct Inner {
int n = ExceptionIf<noexcept(Nested())>::f(); // expected-error {{exception specification is not available until end of class definition}}
} inner;
};
bool y = noexcept(Nested());
bool z = noexcept(Nested::Inner());
}
namespace ExceptionSpecification {
// A type is permitted to be used in a dynamic exception specification when it
// is still being defined, but isn't complete within such an exception
// specification.
struct Nested { // expected-note {{not complete}}
struct T {
T() noexcept(!noexcept(Nested())); // expected-error{{incomplete type}}
} t;
};
}
namespace DefaultArgument {
struct Default {
struct T {
T(int = ExceptionIf<noexcept(Default())::f()); // expected-error {{call to implicitly-deleted default constructor}}
} t; // expected-note {{has no default constructor}}
};
}
namespace ImplicitDtorExceptionSpec {
struct A {
virtual ~A();
struct Inner {
~Inner() throw();
};
Inner inner;
};
struct B {
virtual ~B() {} // expected-note {{here}}
};
struct C : B {
virtual ~C() {}
A a;
};
struct D : B {
~D(); // expected-error {{more lax than base}}
struct E {
~E();
struct F {
~F() throw(A);
} f;
} e;
};
}
|
