1 // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s 2 3 // This must obviously come before the definition of std::initializer_list. 4 void missing_initializerlist() { 5 auto l = {1, 2, 3, 4}; // expected-error {{std::initializer_list was not found}} 6 } 7 8 namespace std { 9 typedef decltype(sizeof(int)) size_t; 10 11 // libc++'s implementation 12 template <class _E> 13 class initializer_list 14 { 15 const _E* __begin_; 16 size_t __size_; 17 18 initializer_list(const _E* __b, size_t __s) 19 : __begin_(__b), 20 __size_(__s) 21 {} 22 23 public: 24 typedef _E value_type; 25 typedef const _E& reference; 26 typedef const _E& const_reference; 27 typedef size_t size_type; 28 29 typedef const _E* iterator; 30 typedef const _E* const_iterator; 31 32 initializer_list() : __begin_(nullptr), __size_(0) {} 33 34 size_t size() const {return __size_;} 35 const _E* begin() const {return __begin_;} 36 const _E* end() const {return __begin_ + __size_;} 37 }; 38 } 39 40 template <typename T, typename U> 41 struct same_type { static const bool value = false; }; 42 template <typename T> 43 struct same_type<T, T> { static const bool value = true; }; 44 45 struct one { char c[1]; }; 46 struct two { char c[2]; }; 47 48 struct A { 49 int a, b; 50 }; 51 52 struct B { 53 B(); 54 B(int, int); 55 }; 56 57 void simple_list() { 58 std::initializer_list<int> il = { 1, 2, 3 }; 59 std::initializer_list<double> dl = { 1.0, 2.0, 3 }; 60 std::initializer_list<A> al = { {1, 2}, {2, 3}, {3, 4} }; 61 std::initializer_list<B> bl = { {1, 2}, {2, 3}, {} }; 62 } 63 64 void function_call() { 65 void f(std::initializer_list<int>); 66 f({1, 2, 3}); 67 68 void g(std::initializer_list<B>); 69 g({ {1, 2}, {2, 3}, {} }); 70 } 71 72 struct C { 73 C(int); 74 }; 75 76 struct D { 77 D(); 78 operator int(); 79 operator C(); 80 }; 81 82 void overloaded_call() { 83 one overloaded(std::initializer_list<int>); 84 two overloaded(std::initializer_list<B>); 85 86 static_assert(sizeof(overloaded({1, 2, 3})) == sizeof(one), "bad overload"); 87 static_assert(sizeof(overloaded({ {1, 2}, {2, 3}, {} })) == sizeof(two), "bad overload"); 88 89 void ambiguous(std::initializer_list<A>); // expected-note {{candidate}} 90 void ambiguous(std::initializer_list<B>); // expected-note {{candidate}} 91 ambiguous({ {1, 2}, {2, 3}, {3, 4} }); // expected-error {{ambiguous}} 92 93 one ov2(std::initializer_list<int>); // expected-note {{candidate}} 94 two ov2(std::initializer_list<C>); // expected-note {{candidate}} 95 // Worst sequence to int is identity, whereas to C it's user-defined. 96 static_assert(sizeof(ov2({1, 2, 3})) == sizeof(one), "bad overload"); 97 // But here, user-defined is worst in both cases. 98 ov2({1, 2, D()}); // expected-error {{ambiguous}} 99 } 100 101 template <typename T> 102 T deduce(std::initializer_list<T>); // expected-note {{conflicting types for parameter 'T' ('int' vs. 'double')}} 103 template <typename T> 104 T deduce_ref(const std::initializer_list<T>&); // expected-note {{conflicting types for parameter 'T' ('int' vs. 'double')}} 105 106 void argument_deduction() { 107 static_assert(same_type<decltype(deduce({1, 2, 3})), int>::value, "bad deduction"); 108 static_assert(same_type<decltype(deduce({1.0, 2.0, 3.0})), double>::value, "bad deduction"); 109 110 deduce({1, 2.0}); // expected-error {{no matching function}} 111 112 static_assert(same_type<decltype(deduce_ref({1, 2, 3})), int>::value, "bad deduction"); 113 static_assert(same_type<decltype(deduce_ref({1.0, 2.0, 3.0})), double>::value, "bad deduction"); 114 115 deduce_ref({1, 2.0}); // expected-error {{no matching function}} 116 } 117 118 void auto_deduction() { 119 auto l = {1, 2, 3, 4}; 120 static_assert(same_type<decltype(l), std::initializer_list<int>>::value, ""); 121 auto bl = {1, 2.0}; // expected-error {{cannot deduce}} 122 123 for (int i : {1, 2, 3, 4}) {} 124 } 125 126 void dangle() { 127 new auto{1, 2, 3}; // expected-error {{cannot use list-initialization}} 128 new std::initializer_list<int>{1, 2, 3}; // expected-warning {{at the end of the full-expression}} 129 } 130 131 struct haslist1 { 132 std::initializer_list<int> il = {1, 2, 3}; // expected-warning{{at the end of the constructor}} 133 std::initializer_list<int> jl{1, 2, 3}; // expected-warning{{at the end of the constructor}} 134 haslist1(); 135 }; 136 137 haslist1::haslist1() 138 : il{1, 2, 3} // expected-warning{{at the end of the constructor}} 139 {} 140 141 namespace PR12119 { 142 // Deduction with nested initializer lists. 143 template<typename T> void f(std::initializer_list<T>); 144 template<typename T> void g(std::initializer_list<std::initializer_list<T>>); 145 146 void foo() { 147 f({0, {1}}); 148 g({{0, 1}, {2, 3}}); 149 std::initializer_list<int> il = {1, 2}; 150 g({il, {2, 3}}); 151 } 152 } 153 154 namespace Decay { 155 template<typename T> 156 void f(std::initializer_list<T>) { 157 T x = 1; // expected-error{{cannot initialize a variable of type 'const char *' with an rvalue of type 'int'}} 158 } 159 160 void g() { 161 f({"A", "BB", "CCC"}); // expected-note{{in instantiation of function template specialization 'Decay::f<const char *>' requested here}} 162 163 auto x = { "A", "BB", "CCC" }; 164 std::initializer_list<const char *> *il = &x; 165 166 for( auto s : {"A", "BB", "CCC", "DDD"}) { } 167 } 168 } 169 170 namespace PR12436 { 171 struct X { 172 template<typename T> 173 X(std::initializer_list<int>, T); 174 }; 175 176 X x({}, 17); 177 } 178 179 namespace rdar11948732 { 180 template<typename T> struct X {}; 181 182 struct XCtorInit { 183 XCtorInit(std::initializer_list<X<int>>); 184 }; 185 186 void f(X<int> &xi) { 187 XCtorInit xc = { xi, xi }; 188 } 189 } 190 191 namespace PR14272 { 192 auto x { { 0, 0 } }; // expected-error {{cannot deduce actual type for variable 'x' with type 'auto' from initializer list}} 193 } 194 195 namespace initlist_of_array { 196 void f(std::initializer_list<int[2]>) {} 197 void f(std::initializer_list<int[2][2]>) = delete; 198 void h() { 199 f({{1,2},{3,4}}); 200 } 201 } 202 203 namespace init_list_deduction_failure { 204 void f(); 205 void f(int); 206 template<typename T> void g(std::initializer_list<T>); 207 // expected-note@-1 {{candidate template ignored: couldn't resolve reference to overloaded function 'f'}} 208 void h() { g({f}); } 209 // expected-error@-1 {{no matching function for call to 'g'}} 210 } 211
