1 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 -ftemplate-depth 16 -fcxx-exceptions -fexceptions %s 2 3 // DR1330: an exception specification for a function template is only 4 // instantiated when it is needed. 5 6 template<typename T> void f1(T*) throw(T); // expected-error{{incomplete type 'Incomplete' is not allowed in exception specification}} 7 struct Incomplete; // expected-note{{forward}} 8 9 void test_f1(Incomplete *incomplete_p, int *int_p) { 10 f1(int_p); 11 f1(incomplete_p); // expected-note{{instantiation of exception spec}} 12 } 13 14 template<typename T> struct A { 15 template<typename U> struct B { 16 static void f() noexcept(A<U>().n); 17 }; 18 19 constexpr A() : n(true) {} 20 bool n; 21 }; 22 23 static_assert(noexcept(A<int>::B<char>::f()), ""); 24 25 template<unsigned N> struct S { 26 static void recurse() noexcept(noexcept(S<N+1>::recurse())); // \ 27 // expected-error {{no member named 'recurse'}} \ 28 // expected-note 9{{instantiation of exception spec}} 29 }; 30 decltype(S<0>::recurse()) *pVoid1 = 0; // ok, exception spec not needed 31 decltype(&S<0>::recurse) pFn = 0; // ok, exception spec not needed 32 33 template<> struct S<10> {}; 34 void (*pFn2)() noexcept = &S<0>::recurse; // expected-note {{instantiation of exception spec}} expected-error {{not superset}} 35 36 37 namespace dr1330_example { 38 template <class T> struct A { 39 void f(...) throw (typename T::X); // expected-error {{'int'}} 40 void f(int); 41 }; 42 43 int main() { 44 A<int>().f(42); 45 } 46 47 int test2() { 48 struct S { 49 template<typename T> 50 static int f() noexcept(noexcept(A<T>().f("boo!"))) { return 0; } // \ 51 // expected-note {{instantiation of exception spec}} 52 typedef decltype(f<S>()) X; 53 }; 54 S().f<S>(); // ok 55 S().f<int>(); // expected-note {{instantiation of exception spec}} 56 } 57 } 58 59 namespace core_19754_example { 60 template<typename T> T declval() noexcept; 61 62 template<typename T, typename = decltype(T(declval<T&&>()))> 63 struct is_movable { static const bool value = true; }; 64 65 template<typename T> 66 struct wrap { 67 T val; 68 void irrelevant(wrap &p) noexcept(is_movable<T>::value); 69 }; 70 71 template<typename T> 72 struct base { 73 base() {} 74 base(const typename T::type1 &); 75 base(const typename T::type2 &); 76 }; 77 78 template<typename T> 79 struct type1 { 80 wrap<typename T::base> base; 81 }; 82 83 template<typename T> 84 struct type2 { 85 wrap<typename T::base> base; 86 }; 87 88 struct types { 89 typedef base<types> base; 90 typedef type1<types> type1; 91 typedef type2<types> type2; 92 }; 93 94 base<types> val = base<types>(); 95 } 96 97 namespace pr9485 { 98 template <typename T> void f1(T) throw(typename T::exception); // expected-note {{candidate}} 99 template <typename T> void f1(T, int = 0) throw(typename T::noitpecxe); // expected-note {{candidate}} 100 101 template <typename T> void f2(T) noexcept(T::throws); // expected-note {{candidate}} 102 template <typename T> void f2(T, int = 0) noexcept(T::sworht); // expected-note {{candidate}} 103 104 void test() { 105 f1(0); // expected-error {{ambiguous}} 106 f2(0); // expected-error {{ambiguous}} 107 } 108 } 109 110 struct Exc1 { char c[4]; }; 111 struct Exc2 { double x, y, z; }; 112 struct Base { 113 virtual void f() noexcept; // expected-note {{overridden}} 114 }; 115 template<typename T> struct Derived : Base { 116 void f() noexcept (sizeof(T) == 4); // expected-error {{is more lax}} 117 void g() noexcept (T::error); 118 }; 119 120 Derived<Exc1> d1; // ok 121 Derived<Exc2> d2; // expected-note {{in instantiation of}} 122 123 // If the vtable for a derived class is used, the exception specification of 124 // any member function which ends up in that vtable is needed, even if it was 125 // declared in a base class. 126 namespace PR12763 { 127 template<bool *B> struct T { 128 virtual void f() noexcept (*B); // expected-error {{constant expression}} expected-note {{read of non-const}} 129 }; 130 bool b; // expected-note {{here}} 131 struct X : public T<&b> { 132 virtual void g(); 133 }; 134 void X::g() {} // expected-note {{in instantiation of}} 135 } 136
