forked from OSchip/llvm-project
97 lines
3.9 KiB
C++
97 lines
3.9 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -fcxx-exceptions -verify -std=c++11 -Wall -Wno-unused-local-typedefs %s
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template<bool b> struct ExceptionIf { static int f(); };
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template<> struct ExceptionIf<false> { typedef int f; };
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// The exception specification of a defaulted default constructor depends on
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// the contents of in-class member initializers. However, the in-class member
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// initializers can depend on the exception specification of the constructor,
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// since the class is considered complete within them. We reject any such cases.
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namespace InClassInitializers {
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// Noexcept::Noexcept() is implicitly declared as noexcept(false), because it
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// directly invokes ThrowSomething(). However...
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//
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// If noexcept(Noexcept()) is false, then Noexcept() is a constant expression,
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// so noexcept(Noexcept()) is true. But if noexcept(Noexcept()) is true, then
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// Noexcept::Noexcept is not declared constexpr, therefore noexcept(Noexcept())
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// is false.
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bool ThrowSomething() noexcept(false);
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struct ConstExpr {
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bool b = noexcept(ConstExpr()) && ThrowSomething(); // expected-error {{cannot use defaulted default constructor of 'ConstExpr' within the class outside of member functions}}
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// expected-note@-1 {{implicit default constructor for 'InClassInitializers::ConstExpr' first required here}}
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};
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// Much more obviously broken: we can't parse the initializer without already
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// knowing whether it produces a noexcept expression.
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struct TemplateArg {
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int n = ExceptionIf<noexcept(TemplateArg())>::f(); // expected-error {{cannot use defaulted default constructor of 'TemplateArg' within the class outside of member functions}}
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// expected-note@-1 {{implicit default constructor for 'InClassInitializers::TemplateArg' first required here}}
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};
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// And within a nested class.
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struct Nested { // expected-note {{implicit default constructor for 'InClassInitializers::Nested::Inner' first required here}}
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struct Inner {
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// expected-error@+1 {{cannot use defaulted default constructor of 'Inner' within 'Nested' outside of member functions}}
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int n = ExceptionIf<noexcept(Nested())>::f(); // expected-note {{implicit default constructor for 'InClassInitializers::Nested' first required here}}
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} inner;
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};
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struct Nested2 { // expected-error {{implicit default constructor for 'InClassInitializers::Nested2' must explicitly initialize the member 'inner' which does not have a default constructor}}
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struct Inner;
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int n = Inner().n; // expected-note {{implicit default constructor for 'InClassInitializers::Nested2::Inner' first required here}}
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struct Inner { // expected-note {{declared here}}
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// expected-error@+1 {{cannot use defaulted default constructor of 'Inner' within 'Nested2' outside of member functions}}
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int n = ExceptionIf<noexcept(Nested2())>::f();
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// expected-note@-1 {{implicit default constructor for 'InClassInitializers::Nested2' first required here}}
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} inner; // expected-note {{member is declared here}}
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};
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}
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namespace ExceptionSpecification {
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// FIXME: This diagnostic is quite useless; we should indicate whose
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// exception specification we were looking for and why.
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struct Nested {
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struct T {
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T() noexcept(!noexcept(Nested()));
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} t; // expected-error{{exception specification is not available until end of class definition}}
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};
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}
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namespace DefaultArgument {
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struct Default {
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struct T {
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T(int = ExceptionIf<noexcept(Default())::f()); // expected-error {{call to implicitly-deleted default constructor}}
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} t; // expected-note {{has no default constructor}}
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};
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}
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namespace ImplicitDtorExceptionSpec {
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struct A {
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virtual ~A();
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struct Inner {
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~Inner() throw();
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};
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Inner inner;
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};
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struct B {
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virtual ~B() {} // expected-note {{here}}
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};
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struct C : B {
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virtual ~C() {}
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A a;
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};
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struct D : B {
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~D(); // expected-error {{more lax than base}}
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struct E {
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~E();
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struct F {
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~F() throw(A);
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} f;
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} e;
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};
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}
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