p4.cpp revision 85ea7aa961deac1d754f610af8062ae3f8b4e2a5 
1// RUN: %clang_cc1 -std=c++0x -fsyntax-only -fexceptions -fcxx-exceptions -verify %s
2
3template<typename... Types> struct tuple;
4template<int I> struct int_c;
5
6template<typename T>
7struct identity {
8  typedef T type;
9};
10
11template<typename T, typename U>
12struct is_same {
13  static const bool value = false;
14};
15
16template<typename T>
17struct is_same<T, T> {
18  static const bool value = true;
19};
20
21// FIXME: Several more bullets to go
22
23// In an initializer-list (8.5); the pattern is an initializer-clause.
24// Note: this also covers expression-lists, since expression-list is
25// just defined as initializer-list.
26void five_args(int, int, int, int, int); // expected-note{{candidate function not viable: requires 5 arguments, but 6 were provided}}
27
28template<int ...Values>
29void initializer_list_expansion() {
30  int values[5] = { Values... }; // expected-error{{excess elements in array initializer}}
31  five_args(Values...); // expected-error{{no matching function for call to 'five_args'}}
32}
33
34template void initializer_list_expansion<1, 2, 3, 4, 5>();
35template 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}}
36
37namespace PR8977 {
38  struct A { };
39  template<typename T, typename... Args> void f(Args... args) {
40    T t(args...);
41  };
42
43  template void f<A>();
44}
45
46// In a base-specifier-list (Clause 10); the pattern is a base-specifier.
47template<typename ...Mixins>
48struct HasMixins : public Mixins... {
49  HasMixins();
50  HasMixins(const HasMixins&);
51  HasMixins(int i);
52};
53
54struct A { }; // expected-note{{candidate constructor (the implicit copy constructor) not viable: no known conversion from 'int' to 'const A' for 1st argument}} \
55// expected-note{{candidate constructor (the implicit move constructor) not viable: no known conversion from 'int' to 'A' for 1st argument}} \
56// expected-note{{candidate constructor (the implicit default constructor) not viable: requires 0 arguments, but 1 was provided}}
57struct B { };
58struct C { };
59struct D { };
60
61A *checkA = new HasMixins<A, B, C, D>;
62B *checkB = new HasMixins<A, B, C, D>;
63D *checkD = new HasMixins<A, B, C, D>;
64C *checkC = new HasMixins<A, B, D>; // expected-error{{cannot initialize a variable of type 'C *' with an rvalue of type 'HasMixins<A, B, D> *'}}
65HasMixins<> *checkNone = new HasMixins<>;
66
67template<typename Mixins>
68struct BrokenMixins : public Mixins... { }; // expected-error{{pack expansion does not contain any unexpanded parameter packs}}
69
70// In a mem-initializer-list (12.6.2); the pattern is a mem-initializer.
71template<typename ...Mixins>
72HasMixins<Mixins...>::HasMixins(): Mixins()... { }
73
74template<typename ...Mixins>
75HasMixins<Mixins...>::HasMixins(const HasMixins &other): Mixins(other)... { }
76
77template<typename ...Mixins>
78HasMixins<Mixins...>::HasMixins(int i): Mixins(i)... { } // expected-error{{no matching constructor for initialization of 'A'}}
79
80void test_has_mixins() {
81  HasMixins<A, B> ab;
82  HasMixins<A, B> ab2 = ab;
83  HasMixins<A, B> ab3(17); // expected-note{{in instantiation of member function 'HasMixins<A, B>::HasMixins' requested here}}
84}
85
86template<typename T>
87struct X {
88  T member;
89
90  X() : member()... { } // expected-error{{pack expansion for initialization of member 'member'}}
91};
92
93// In a template-argument-list (14.3); the pattern is a template-argument.
94template<typename ...Types>
95struct tuple_of_refs {
96  typedef tuple<Types& ...> types;
97};
98
99tuple<int&, float&> *t_int_ref_float_ref;
100tuple_of_refs<int&, float&>::types *t_int_ref_float_ref_2 =  t_int_ref_float_ref;
101
102template<typename ...Types>
103struct extract_nested_types {
104  typedef tuple<typename Types::type...> types;
105};
106
107tuple<int, float> *t_int_float;
108extract_nested_types<identity<int>, identity<float> >::types *t_int_float_2
109  = t_int_float;
110
111template<int ...N>
112struct tuple_of_ints {
113  typedef tuple<int_c<N>...> type;
114};
115
116int check_temp_arg_1[is_same<tuple_of_ints<1, 2, 3, 4, 5>::type,
117                             tuple<int_c<1>, int_c<2>, int_c<3>, int_c<4>,
118                                   int_c<5>>>::value? 1 : -1];
119
120// In a dynamic-exception-specification (15.4); the pattern is a type-id.
121template<typename ...Types>
122struct f_with_except {
123  virtual void f() throw(Types...); // expected-note{{overridden virtual function is here}}
124};
125
126struct check_f_with_except_1 : f_with_except<int, float> {
127  virtual void f() throw(int, float);
128};
129
130struct check_f_with_except_2 : f_with_except<int, float> {
131  virtual void f() throw(int);
132};
133
134struct check_f_with_except_3 : f_with_except<int, float> {
135  virtual void f() throw(int, float, double); // expected-error{{exception specification of overriding function is more lax than base version}}
136};
137