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
test_f1(Incomplete * incomplete_p,int * int_p)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
AA22 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
main()46 int main() {
47 A<int>().f(42);
48 }
49
50 struct S {
51 template<typename T>
fdr1330_example::S52 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
test2()57 int test2() {
58 S().f<S>(); // ok
59 S().f<int>(); // expected-note {{instantiation of exception spec}}
60 }
61
62 template<typename T>
63 struct U {
64 void f() noexcept(T::error);
65 void (g)() noexcept(T::error);
66 };
67 U<int> uint; // ok
68 }
69
70 namespace core_19754_example {
71 template<typename T> T declval() noexcept;
72
73 template<typename T, typename = decltype(T(declval<T&&>()))>
74 struct is_movable { static const bool value = true; };
75
76 template<typename T>
77 struct wrap {
78 T val;
79 void irrelevant(wrap &p) noexcept(is_movable<T>::value);
80 };
81
82 template<typename T>
83 struct base {
basecore_19754_example::base84 base() {}
85 base(const typename T::type1 &);
86 base(const typename T::type2 &);
87 };
88
89 template<typename T>
90 struct type1 {
91 wrap<typename T::base> base;
92 };
93
94 template<typename T>
95 struct type2 {
96 wrap<typename T::base> base;
97 };
98
99 struct types {
100 typedef base<types> base;
101 typedef type1<types> type1;
102 typedef type2<types> type2;
103 };
104
105 base<types> val = base<types>();
106 }
107
108 namespace pr9485 {
109 template <typename T> void f1(T) throw(typename T::exception); // expected-note {{candidate}}
110 template <typename T> void f1(T, int = 0) throw(typename T::noitpecxe); // expected-note {{candidate}}
111
112 template <typename T> void f2(T) noexcept(T::throws); // expected-note {{candidate}}
113 template <typename T> void f2(T, int = 0) noexcept(T::sworht); // expected-note {{candidate}}
114
test()115 void test() {
116 f1(0); // expected-error {{ambiguous}}
117 f2(0); // expected-error {{ambiguous}}
118 }
119 }
120
121 struct Exc1 { char c[4]; };
122 struct Exc2 { double x, y, z; };
123 struct Base {
124 virtual void f() noexcept; // expected-note {{overridden}}
125 };
126 template<typename T> struct Derived : Base {
127 void f() noexcept (sizeof(T) == 4); // expected-error {{is more lax}}
128 void g() noexcept (T::error);
129 };
130
131 Derived<Exc1> d1; // ok
132 Derived<Exc2> d2; // expected-note {{in instantiation of}}
133
134 // If the vtable for a derived class is used, the exception specification of
135 // any member function which ends up in that vtable is needed, even if it was
136 // declared in a base class.
137 namespace PR12763 {
138 template<bool *B> struct T {
139 virtual void f() noexcept (*B); // expected-error {{constant expression}} expected-note {{read of non-const}}
140 };
141 bool b; // expected-note {{here}}
142 struct X : public T<&b> {
143 virtual void g();
144 };
g()145 void X::g() {} // expected-note {{in instantiation of}}
146 }
147
148 namespace Variadic {
check()149 template<bool B> void check() { static_assert(B, ""); }
check()150 template<bool B, bool B2, bool ...Bs> void check() { static_assert(B, ""); check<B2, Bs...>(); }
151
152 template<typename ...T> void consume(T...);
153
f(void (* ...p)()throw (T))154 template<typename ...T> void f(void (*...p)() throw (T)) {
155 void (*q[])() = { p... };
156 consume((p(),0)...);
157 }
g(void (* ...p)()noexcept (B))158 template<bool ...B> void g(void (*...p)() noexcept (B)) {
159 consume((p(),0)...);
160 check<noexcept(p()) == B ...>();
161 }
i()162 template<typename ...T> void i() {
163 consume([]() throw(T) {} ...);
164 consume([]() noexcept(sizeof(T) == 4) {} ...);
165 }
j()166 template<bool ...B> void j() {
167 consume([](void (*p)() noexcept(B)) {
168 void (*q)() noexcept = p; // expected-error {{not superset of source}}
169 } ...);
170 }
171
z()172 void z() {
173 f<int, char, double>(nullptr, nullptr, nullptr);
174 g<true, false, true>(nullptr, nullptr, nullptr);
175 i<int, long, short>();
176 j<true, true>();
177 j<true, false>(); // expected-note {{in instantiation of}}
178 }
179
180 }
181