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 template<typename T> T go(T a) noexcept(noexcept(go(a))); // \ 38 // expected-error 16{{call to function 'go' that is neither visible}} \ 39 // expected-note 16{{'go' should be declared prior to the call site}} \ 40 // expected-error {{recursive template instantiation exceeded maximum depth of 16}} \ 41 // expected-error {{use of undeclared identifier 'go'}} \ 42 43 void f() { 44 int k = go(0); // \ 45 // expected-note {{in instantiation of exception specification for 'go<int>' requested here}} 46 } 47 48 49 namespace dr1330_example { 50 template <class T> struct A { 51 void f(...) throw (typename T::X); // expected-error {{'int'}} 52 void f(int); 53 }; 54 55 int main() { 56 A<int>().f(42); 57 } 58 59 int test2() { 60 struct S { 61 template<typename T> 62 static int f() noexcept(noexcept(A<T>().f("boo!"))) { return 0; } // \ 63 // expected-note {{instantiation of exception spec}} 64 typedef decltype(f<S>()) X; 65 }; 66 S().f<S>(); // ok 67 S().f<int>(); // expected-note {{instantiation of exception spec}} 68 } 69 } 70 71 namespace core_19754_example { 72 template<typename T> T declval() noexcept; 73 74 template<typename T, typename = decltype(T(declval<T&&>()))> 75 struct is_movable { static const bool value = true; }; 76 77 template<typename T> 78 struct wrap { 79 T val; 80 void irrelevant(wrap &p) noexcept(is_movable<T>::value); 81 }; 82 83 template<typename T> 84 struct base { 85 base() {} 86 base(const typename T::type1 &); 87 base(const typename T::type2 &); 88 }; 89 90 template<typename T> 91 struct type1 { 92 wrap<typename T::base> base; 93 }; 94 95 template<typename T> 96 struct type2 { 97 wrap<typename T::base> base; 98 }; 99 100 struct types { 101 typedef base<types> base; 102 typedef type1<types> type1; 103 typedef type2<types> type2; 104 }; 105 106 base<types> val = base<types>(); 107 } 108 109 namespace pr9485 { 110 template <typename T> void f1(T) throw(typename T::exception); // expected-note {{candidate}} 111 template <typename T> void f1(T, int = 0) throw(typename T::noitpecxe); // expected-note {{candidate}} 112 113 template <typename T> void f2(T) noexcept(T::throws); // expected-note {{candidate}} 114 template <typename T> void f2(T, int = 0) noexcept(T::sworht); // expected-note {{candidate}} 115 116 void test() { 117 f1(0); // expected-error {{ambiguous}} 118 f2(0); // expected-error {{ambiguous}} 119 } 120 } 121 122 struct Exc1 { char c[4]; }; 123 struct Exc2 { double x, y, z; }; 124 struct Base { 125 virtual void f() noexcept; // expected-note {{overridden}} 126 }; 127 template<typename T> struct Derived : Base { 128 void f() noexcept (sizeof(T) == 4); // expected-error {{is more lax}} 129 void g() noexcept (T::error); 130 }; 131 132 Derived<Exc1> d1; // ok 133 Derived<Exc2> d2; // expected-note {{in instantiation of}} 134
