1 // RUN: %clang_cc1 -fsyntax-only -verify -triple %itanium_abi_triple -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 // Note: the test is Itanium-specific because it depends on key functions in the 7 // PR12763 namespace. 8 9 template<typename T> void f1(T*) throw(T); // expected-error{{incomplete type 'Incomplete' is not allowed in exception specification}} 10 struct Incomplete; // expected-note{{forward}} 11 12 void test_f1(Incomplete *incomplete_p, int *int_p) { 13 f1(int_p); 14 f1(incomplete_p); // expected-note{{instantiation of exception spec}} 15 } 16 17 template<typename T> struct A { 18 template<typename U> struct B { 19 static void f() noexcept(A<U>().n); 20 }; 21 22 constexpr A() : n(true) {} 23 bool n; 24 }; 25 26 static_assert(noexcept(A<int>::B<char>::f()), ""); 27 28 template<unsigned N> struct S { 29 static void recurse() noexcept(noexcept(S<N+1>::recurse())); // \ 30 // expected-error {{no member named 'recurse'}} \ 31 // expected-note 9{{instantiation of exception spec}} 32 }; 33 decltype(S<0>::recurse()) *pVoid1 = 0; // ok, exception spec not needed 34 decltype(&S<0>::recurse) pFn = 0; // ok, exception spec not needed 35 36 template<> struct S<10> {}; 37 void (*pFn2)() noexcept = &S<0>::recurse; // expected-note {{instantiation of exception spec}} expected-error {{not superset}} 38 39 40 namespace dr1330_example { 41 template <class T> struct A { 42 void f(...) throw (typename T::X); // expected-error {{'int'}} 43 void f(int); 44 }; 45 46 int main() { 47 A<int>().f(42); 48 } 49 50 struct S { 51 template<typename T> 52 static int f() noexcept(noexcept(A<T>().f("boo!"))) { return 0; } // \ 53 // expected-note {{instantiation of exception spec}} 54 typedef decltype(f<S>()) X; 55 }; 56 57 int test2() { 58 S().f<S>(); // ok 59 S().f<int>(); // expected-note {{instantiation of exception spec}} 60 } 61 } 62 63 namespace core_19754_example { 64 template<typename T> T declval() noexcept; 65 66 template<typename T, typename = decltype(T(declval<T&&>()))> 67 struct is_movable { static const bool value = true; }; 68 69 template<typename T> 70 struct wrap { 71 T val; 72 void irrelevant(wrap &p) noexcept(is_movable<T>::value); 73 }; 74 75 template<typename T> 76 struct base { 77 base() {} 78 base(const typename T::type1 &); 79 base(const typename T::type2 &); 80 }; 81 82 template<typename T> 83 struct type1 { 84 wrap<typename T::base> base; 85 }; 86 87 template<typename T> 88 struct type2 { 89 wrap<typename T::base> base; 90 }; 91 92 struct types { 93 typedef base<types> base; 94 typedef type1<types> type1; 95 typedef type2<types> type2; 96 }; 97 98 base<types> val = base<types>(); 99 } 100 101 namespace pr9485 { 102 template <typename T> void f1(T) throw(typename T::exception); // expected-note {{candidate}} 103 template <typename T> void f1(T, int = 0) throw(typename T::noitpecxe); // expected-note {{candidate}} 104 105 template <typename T> void f2(T) noexcept(T::throws); // expected-note {{candidate}} 106 template <typename T> void f2(T, int = 0) noexcept(T::sworht); // expected-note {{candidate}} 107 108 void test() { 109 f1(0); // expected-error {{ambiguous}} 110 f2(0); // expected-error {{ambiguous}} 111 } 112 } 113 114 struct Exc1 { char c[4]; }; 115 struct Exc2 { double x, y, z; }; 116 struct Base { 117 virtual void f() noexcept; // expected-note {{overridden}} 118 }; 119 template<typename T> struct Derived : Base { 120 void f() noexcept (sizeof(T) == 4); // expected-error {{is more lax}} 121 void g() noexcept (T::error); 122 }; 123 124 Derived<Exc1> d1; // ok 125 Derived<Exc2> d2; // expected-note {{in instantiation of}} 126 127 // If the vtable for a derived class is used, the exception specification of 128 // any member function which ends up in that vtable is needed, even if it was 129 // declared in a base class. 130 namespace PR12763 { 131 template<bool *B> struct T { 132 virtual void f() noexcept (*B); // expected-error {{constant expression}} expected-note {{read of non-const}} 133 }; 134 bool b; // expected-note {{here}} 135 struct X : public T<&b> { 136 virtual void g(); 137 }; 138 void X::g() {} // expected-note {{in instantiation of}} 139 } 140
