Sebastian Redl | 2b916b8 | 2012-01-17 22:49:42 +0000 | [diff] [blame] | 1 | // RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify %s |
| 2 | |
Sebastian Redl | b832f6d | 2012-01-23 22:09:39 +0000 | [diff] [blame] | 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 | |
Sebastian Redl | 2b916b8 | 2012-01-17 22:49:42 +0000 | [diff] [blame] | 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 | |
Sebastian Redl | 84760e3 | 2012-01-17 22:49:58 +0000 | [diff] [blame] | 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 | |
Sebastian Redl | 2b916b8 | 2012-01-17 22:49:42 +0000 | [diff] [blame] | 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 | } |
Sebastian Redl | fe59228 | 2012-01-17 22:49:48 +0000 | [diff] [blame] | 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 | } |
Sebastian Redl | 84760e3 | 2012-01-17 22:49:58 +0000 | [diff] [blame] | 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 | } |
Sebastian Redl | 62b7cfb | 2012-01-17 22:50:08 +0000 | [diff] [blame] | 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 | } |
Sebastian Redl | 6dc00f6 | 2012-02-12 18:41:05 +0000 | [diff] [blame] | 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 | } |
Sebastian Redl | 772291a | 2012-02-19 16:31:05 +0000 | [diff] [blame] | 130 | |
| 131 | struct haslist1 { |
| 132 | std::initializer_list<int> il = {1, 2, 3}; // expected-warning{{at the end of the constructor}} |
Sebastian Redl | 33deb35 | 2012-02-22 10:50:08 +0000 | [diff] [blame] | 133 | std::initializer_list<int> jl{1, 2, 3}; // expected-warning{{at the end of the constructor}} |
Sebastian Redl | 772291a | 2012-02-19 16:31:05 +0000 | [diff] [blame] | 134 | haslist1(); |
| 135 | }; |
| 136 | |
| 137 | haslist1::haslist1() |
| 138 | : il{1, 2, 3} // expected-warning{{at the end of the constructor}} |
| 139 | {} |
Sebastian Redl | 4b911e6 | 2012-03-15 21:40:51 +0000 | [diff] [blame] | 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 | } |
Douglas Gregor | d280389 | 2012-04-04 05:10:53 +0000 | [diff] [blame] | 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 | } |
Douglas Gregor | 5b4bf13 | 2012-04-04 23:09:20 +0000 | [diff] [blame] | 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 | } |
Douglas Gregor | 3c394c5 | 2012-07-31 22:15:04 +0000 | [diff] [blame] | 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 | } |
Eli Friedman | 70a0189 | 2012-11-06 23:56:42 +0000 | [diff] [blame] | 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 | } |
Richard Smith | 2801d9a | 2012-12-09 06:48:56 +0000 | [diff] [blame] | 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 | } |
Richard Smith | 0efa62f | 2013-01-31 04:03:12 +0000 | [diff] [blame] | 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 | } |