1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -fexceptions -fcxx-exceptions -verify %s
2 
3 template<typename... Types> struct tuple;
4 template<int I> struct int_c;
5 
6 template<typename T>
7 struct identity {
8   typedef T type;
9 };
10 
11 template<typename T, typename U>
12 struct is_same {
13   static const bool value = false;
14 };
15 
16 template<typename T>
17 struct is_same<T, T> {
18   static const bool value = true;
19 };
20 
21 // FIXME: Several more bullets to go
22 
23 // In a function parameter pack, the pattern is the parameter-declaration
24 // without the ellipsis.
25 namespace PR11850 {
26   template<typename ...T> struct S {
fPR11850::S27     int f(T...a, int b) { return b; }
28   };
29   S<> s;
30   S<int*, char, const double&> t;
31   int k = s.f(0);
32   int l = t.f(&k, 'x', 5.9, 4);
33 
34   template<typename ...As> struct A {
35     template<typename ...Bs> struct B {
36       template<typename ...Cs> struct C {
37         C(As..., Bs..., int &k, Cs...);
38       };
39     };
40   };
41   A<>::B<>::C<> c000(k);
42   A<int>::B<>::C<int> c101(1, k, 3);
43   A<>::B<int>::C<int> c011(1, k, 3);
44   A<int>::B<int>::C<> c110(1, 2, k);
45   A<int, int>::B<int, int>::C<int, int> c222(1, 2, 3, 4, k, 5, 6);
46   A<int, int, int>::B<>::C<> c300(1, 2, 3, k);
47 
48   int &f();
49   char &f(void*);
50   template<typename ...A> struct U {
51     template<typename ...B> struct V {
52       auto g(A...a, B...b) -> decltype(f(a...));
53     };
54   };
55   U<>::V<int*> v0;
56   U<int*>::V<> v1;
57   int &v0f = v0.g(0);
58   char &v1f = v1.g(0);
59 }
60 namespace PR12096 {
Foo(int)61   void Foo(int) {}
62   void Foo(int, int) = delete;
63   template<typename ...Args> struct Var {
VarPR12096::Var64     Var(const Args &...args, int *) { Foo(args...); }
65   };
66   Var<int> var(1, 0);
67 }
68 
69 // In an initializer-list (8.5); the pattern is an initializer-clause.
70 // Note: this also covers expression-lists, since expression-list is
71 // just defined as initializer-list.
72 void five_args(int, int, int, int, int); // expected-note{{candidate function not viable: requires 5 arguments, but 6 were provided}}
73 
74 template<int ...Values>
initializer_list_expansion()75 void initializer_list_expansion() {
76   int values[5] = { Values... }; // expected-error{{excess elements in array initializer}}
77   five_args(Values...); // expected-error{{no matching function for call to 'five_args'}}
78 }
79 
80 template void initializer_list_expansion<1, 2, 3, 4, 5>();
81 template void initializer_list_expansion<1, 2, 3, 4, 5, 6>(); // expected-note{{in instantiation of function template specialization 'initializer_list_expansion<1, 2, 3, 4, 5, 6>' requested here}}
82 
83 namespace PR8977 {
84   struct A { };
f(Args...args)85   template<typename T, typename... Args> void f(Args... args) {
86     // An empty expression-list performs value initialization.
87     constexpr T t(args...);
88   };
89 
90   template void f<A>();
91 }
92 
93 // In a base-specifier-list (Clause 10); the pattern is a base-specifier.
94 template<typename ...Mixins>
95 struct HasMixins : public Mixins... {
96   HasMixins();
97   HasMixins(const HasMixins&);
98   HasMixins(int i);
99 };
100 
101 struct A { }; // expected-note{{candidate constructor (the implicit copy constructor) not viable: no known conversion from 'int' to 'const A' for 1st argument}} \
102 // expected-note{{candidate constructor (the implicit move constructor) not viable: no known conversion from 'int' to 'A' for 1st argument}} \
103 // expected-note{{candidate constructor (the implicit default constructor) not viable: requires 0 arguments, but 1 was provided}}
104 struct B { };
105 struct C { };
106 struct D { };
107 
108 A *checkA = new HasMixins<A, B, C, D>;
109 B *checkB = new HasMixins<A, B, C, D>;
110 D *checkD = new HasMixins<A, B, C, D>;
111 C *checkC = new HasMixins<A, B, D>; // expected-error{{cannot initialize a variable of type 'C *' with an rvalue of type 'HasMixins<A, B, D> *'}}
112 HasMixins<> *checkNone = new HasMixins<>;
113 
114 template<typename Mixins>
115 struct BrokenMixins : public Mixins... { }; // expected-error{{pack expansion does not contain any unexpanded parameter packs}}
116 
117 // In a mem-initializer-list (12.6.2); the pattern is a mem-initializer.
118 template<typename ...Mixins>
HasMixins()119 HasMixins<Mixins...>::HasMixins(): Mixins()... { }
120 
121 template<typename ...Mixins>
HasMixins(const HasMixins & other)122 HasMixins<Mixins...>::HasMixins(const HasMixins &other): Mixins(other)... { }
123 
124 template<typename ...Mixins>
HasMixins(int i)125 HasMixins<Mixins...>::HasMixins(int i): Mixins(i)... { } // expected-error{{no matching constructor for initialization of 'A'}}
126 
test_has_mixins()127 void test_has_mixins() {
128   HasMixins<A, B> ab;
129   HasMixins<A, B> ab2 = ab;
130   HasMixins<A, B> ab3(17); // expected-note{{in instantiation of member function 'HasMixins<A, B>::HasMixins' requested here}}
131 }
132 
133 template<typename T>
134 struct X {
135   T member;
136 
XX137   X() : member()... { } // expected-error{{pack expansion for initialization of member 'member'}}
138 };
139 
140 // There was a bug in the delayed parsing code for the
141 // following case.
142 template<typename ...T>
143 struct DelayedParseTest : T...
144 {
145   int a;
DelayedParseTestDelayedParseTest146   DelayedParseTest(T... i) : T{i}..., a{10} {}
147 };
148 
149 
150 // In a template-argument-list (14.3); the pattern is a template-argument.
151 template<typename ...Types>
152 struct tuple_of_refs {
153   typedef tuple<Types& ...> types;
154 };
155 
156 tuple<int&, float&> *t_int_ref_float_ref;
157 tuple_of_refs<int&, float&>::types *t_int_ref_float_ref_2 =  t_int_ref_float_ref;
158 
159 template<typename ...Types>
160 struct extract_nested_types {
161   typedef tuple<typename Types::type...> types;
162 };
163 
164 tuple<int, float> *t_int_float;
165 extract_nested_types<identity<int>, identity<float> >::types *t_int_float_2
166   = t_int_float;
167 
168 template<int ...N>
169 struct tuple_of_ints {
170   typedef tuple<int_c<N>...> type;
171 };
172 
173 int check_temp_arg_1[is_same<tuple_of_ints<1, 2, 3, 4, 5>::type,
174                              tuple<int_c<1>, int_c<2>, int_c<3>, int_c<4>,
175                                    int_c<5>>>::value? 1 : -1];
176 
177 // In a dynamic-exception-specification (15.4); the pattern is a type-id.
178 template<typename ...Types>
179 struct f_with_except {
180   virtual void f() throw(Types...); // expected-note{{overridden virtual function is here}}
181 };
182 
183 struct check_f_with_except_1 : f_with_except<int, float> {
184   virtual void f() throw(int, float);
185 };
186 
187 struct check_f_with_except_2 : f_with_except<int, float> {
188   virtual void f() throw(int);
189 };
190 
191 struct check_f_with_except_3 : f_with_except<int, float> {
192   virtual void f() throw(int, float, double); // expected-error{{exception specification of overriding function is more lax than base version}}
193 };
194