1 // RUN: %clang_cc1 -fcxx-exceptions -fexceptions -std=c++11 -fblocks -fms-extensions -fsyntax-only -verify %s 2 3 template<typename T, typename U> struct pair; 4 template<typename ...> struct tuple; 5 6 // A parameter pack whose name appears within the pattern of a pack 7 // expansion is expanded by that pack expansion. An appearance of the 8 // name of a parameter pack is only expanded by the innermost 9 // enclosing pack expansion. The pattern of a pack expansion shall 10 // name one or more parameter packs that are not expanded by a nested 11 // pack expansion. 12 template<typename... Types> 13 struct Expansion { 14 typedef pair<Types..., int> expand_with_pacs; // okay 15 typedef pair<Types, int...> expand_no_packs; // expected-error{{pack expansion does not contain any unexpanded parameter packs}} 16 typedef pair<pair<Types..., int>..., int> expand_with_expanded_nested; // expected-error{{pack expansion does not contain any unexpanded parameter packs}} 17 }; 18 19 // All of the parameter packs expanded by a pack expansion shall have 20 // the same number of arguments specified. 21 template<typename ...Types> 22 struct ExpansionLengthMismatch { 23 template<typename ...OtherTypes> 24 struct Inner { 25 typedef tuple<pair<Types, OtherTypes>...> type; // expected-error{{pack expansion contains parameter packs 'Types' and 'OtherTypes' that have different lengths (3 vs. 2)}} 26 }; 27 }; 28 29 ExpansionLengthMismatch<int, long>::Inner<unsigned int, unsigned long>::type 30 *il_pairs; 31 tuple<pair<int, unsigned int>, pair<long, unsigned long> >*il_pairs_2 = il_pairs; 32 33 ExpansionLengthMismatch<short, int, long>::Inner<unsigned int, unsigned long>::type // expected-note{{in instantiation of template class 'ExpansionLengthMismatch<short, int, long>::Inner<unsigned int, unsigned long>' requested here}} 34 *il_pairs_bad; 35 36 37 // An appearance of a name of a parameter pack that is not expanded is 38 // ill-formed. 39 40 // Test for unexpanded parameter packs in each of the type nodes. 41 template<typename T, int N, typename ... Types> 42 struct TestPPName 43 : public Types, public T // expected-error{{base type contains unexpanded parameter pack 'Types'}} 44 { 45 // BuiltinType is uninteresting 46 // FIXME: ComplexType is uninteresting? 47 // PointerType 48 typedef Types *types_pointer; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 49 50 // BlockPointerType 51 typedef Types (^block_pointer_1)(int); // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 52 typedef int (^block_pointer_2)(Types); // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 53 54 // LValueReferenceType 55 typedef Types &lvalue_ref; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 56 57 // RValueReferenceType 58 typedef Types &&rvalue_ref; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 59 60 // MemberPointerType 61 typedef Types TestPPName::* member_pointer_1; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 62 typedef int Types::*member_pointer_2; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 63 64 // ConstantArrayType 65 typedef Types constant_array[17]; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 66 67 // IncompleteArrayType 68 typedef Types incomplete_array[]; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 69 70 // VariableArrayType 71 void f(int i) { 72 Types variable_array[i]; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 73 } 74 75 // DependentSizedArrayType 76 typedef Types dependent_sized_array[N]; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 77 78 // DependentSizedExtVectorType 79 typedef Types dependent_sized_ext_vector __attribute__((ext_vector_type(N))); // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 80 81 // VectorType is uninteresting 82 83 // ExtVectorType 84 typedef Types ext_vector __attribute__((ext_vector_type(4))); // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 85 86 // FunctionProtoType 87 typedef Types (function_type_1)(int); // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 88 typedef int (function_type_2)(Types); // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 89 90 // FunctionNoProtoType is uninteresting 91 // UnresolvedUsingType is uninteresting 92 // ParenType is uninteresting 93 // TypedefType is uninteresting 94 95 // TypeOfExprType 96 typedef __typeof__((static_cast<Types>(0))) typeof_expr; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 97 98 // TypeOfType 99 typedef __typeof__(Types) typeof_type; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 100 101 // DecltypeType 102 typedef decltype((static_cast<Types>(0))) typeof_expr; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 103 104 // RecordType is uninteresting 105 // EnumType is uninteresting 106 // ElaboratedType is uninteresting 107 108 // TemplateTypeParmType 109 typedef Types template_type_parm; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 110 111 // SubstTemplateTypeParmType is uninteresting 112 113 // TemplateSpecializationType 114 typedef pair<Types, int> template_specialization; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 115 116 // InjectedClassName is uninteresting. 117 118 // DependentNameType 119 typedef typename Types::type dependent_name; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 120 121 // DependentTemplateSpecializationType 122 typedef typename Types::template apply<int> dependent_name_1; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 123 typedef typename T::template apply<Types> dependent_name_2; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 124 125 // ObjCObjectType is uninteresting 126 // ObjCInterfaceType is uninteresting 127 // ObjCObjectPointerType is uninteresting 128 }; 129 130 // FIXME: Test for unexpanded parameter packs in each of the expression nodes. 131 template<int ...Values> 132 void test_unexpanded_in_exprs() { 133 // PredefinedExpr is uninteresting 134 // DeclRefExpr 135 Values; // expected-error{{expression contains unexpanded parameter pack 'Values'}} 136 // IntegerLiteral is uninteresting 137 // FloatingLiteral is uninteresting 138 // ImaginaryLiteral is uninteresting 139 // StringLiteral is uninteresting 140 // CharacterLiteral is uninteresting 141 (Values); // expected-error{{expression contains unexpanded parameter pack 'Values'}} 142 // UnaryOperator 143 -Values; // expected-error{{expression contains unexpanded parameter pack 'Values'}} 144 // OffsetOfExpr 145 struct OffsetMe { 146 int array[17]; 147 }; 148 __builtin_offsetof(OffsetMe, array[Values]); // expected-error{{expression contains unexpanded parameter pack 'Values'}} 149 // FIXME: continue this... 150 } 151 152 template<typename ... Types> 153 void TestPPNameFunc(int i) { 154 f(static_cast<Types>(i)); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 155 } 156 157 template<typename T, template<class> class ...Meta> 158 struct TestUnexpandedTTP { 159 typedef tuple<typename Meta<T>::type> type; // expected-error{{declaration type contains unexpanded parameter pack 'Meta'}} 160 }; 161 162 // Test for unexpanded parameter packs in declarations. 163 // FIXME: Attributes? 164 template<typename T, typename... Types> 165 struct TestUnexpandedDecls : T{ 166 void member_function(Types); // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 167 void member_function () throw(Types); // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 168 operator Types() const; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 169 Types data_member; // expected-error{{data member type contains unexpanded parameter pack 'Types'}} 170 static Types static_data_member; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 171 unsigned bit_field : static_cast<Types>(0); // expected-error{{bit-field size contains unexpanded parameter pack 'Types'}} 172 static_assert(static_cast<Types>(0), "Boom"); // expected-error{{static assertion contains unexpanded parameter pack 'Types'}} 173 174 enum E0 : Types { // expected-error{{fixed underlying type contains unexpanded parameter pack 'Types'}} 175 EnumValue = static_cast<Types>(0) // expected-error{{enumerator value contains unexpanded parameter pack 'Types'}} 176 }; 177 178 using typename Types::type; // expected-error{{using declaration contains unexpanded parameter pack 'Types'}} 179 using Types::value; // expected-error{{using declaration contains unexpanded parameter pack 'Types'}} 180 using T::operator Types; // expected-error{{using declaration contains unexpanded parameter pack 'Types'}} 181 182 friend class Types::foo; // expected-error{{friend declaration contains unexpanded parameter pack 'Types'}} 183 friend void friend_func(Types); // expected-error{{friend declaration contains unexpanded parameter pack 'Types'}} 184 friend void Types::other_friend_func(int); // expected-error{{friend declaration contains unexpanded parameter pack 'Types'}} 185 186 void test_initializers() { 187 T copy_init = static_cast<Types>(0); // expected-error{{initializer contains unexpanded parameter pack 'Types'}} 188 T direct_init(0, static_cast<Types>(0)); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 189 T list_init = { static_cast<Types>(0) }; // expected-error{{initializer contains unexpanded parameter pack 'Types'}} 190 } 191 192 void default_function_args(T = static_cast<Types>(0)); // expected-error{{default argument contains unexpanded parameter pack 'Types'}} 193 194 template<typename = Types*> // expected-error{{default argument contains unexpanded parameter pack 'Types'}} 195 struct default_template_args_1; 196 template<int = static_cast<Types>(0)> // expected-error{{default argument contains unexpanded parameter pack 'Types'}} 197 struct default_template_args_2; 198 template<template<typename> class = Types::template apply> // expected-error{{default argument contains unexpanded parameter pack 'Types'}} 199 struct default_template_args_3; 200 201 template<Types value> // expected-error{{non-type template parameter type contains unexpanded parameter pack 'Types'}} 202 struct non_type_template_param_type; 203 204 void decls_in_stmts() { 205 Types t; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 206 for (Types *t = 0; ; ) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 207 for (; Types *t = 0; ) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 208 T a[] = { T(), T(), T() }; 209 for (Types t : a) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 210 switch(Types *t = 0) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 211 while(Types *t = 0) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 212 if (Types *t = 0) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 213 try { 214 } catch (Types*) { // expected-error{{exception type contains unexpanded parameter pack 'Types'}} 215 } 216 } 217 }; 218 219 // FIXME: Test for unexpanded parameter packs in each of the statements. 220 struct X { 221 void f(int, int); 222 template<typename ...Types> 223 void f(Types...); 224 }; 225 226 namespace std { 227 class type_info; 228 } 229 230 typedef struct _GUID { 231 unsigned long Data1; 232 unsigned short Data2; 233 unsigned short Data3; 234 unsigned char Data4[ 8 ]; 235 } GUID; 236 237 template<typename T, typename ...Types> 238 void test_unexpanded_exprs(Types ...values) { 239 // CXXOperatorCallExpr 240 (void)(values + 0); // expected-error{{expression contains unexpanded parameter pack 'values'}} 241 (void)(0 + values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 242 243 // CXXMemberCallExpr 244 values.f(); // expected-error{{expression contains unexpanded parameter pack 'values'}} 245 X x; 246 x.f(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 247 x.Types::f(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 248 x.f<Types>(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 249 250 // CXXStaticCastExpr 251 (void)static_cast<Types&>(values); // expected-error{{expression contains unexpanded parameter packs 'Types' and 'values'}} 252 253 // CXXDynamicCastExpr 254 (void)dynamic_cast<Types&>(values); // expected-error{{expression contains unexpanded parameter packs 'Types' and 'values'}} 255 256 // CXXReinterpretCastExpr 257 (void)reinterpret_cast<Types&>(values); // expected-error{{expression contains unexpanded parameter packs 'Types' and 'values'}} 258 259 // CXXConstCastExpr 260 (void)const_cast<Types&>(values); // expected-error{{expression contains unexpanded parameter packs 'Types' and 'values'}} 261 262 // CXXTypeidExpr 263 (void)typeid(Types); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 264 (void)typeid(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 265 266 // CXXUuidofExpr 267 (void)__uuidof(Types); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 268 (void)__uuidof(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 269 270 // CXXThisExpr is uninteresting 271 272 // CXXThrowExpr 273 throw Types(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 274 throw values; // expected-error{{expression contains unexpanded parameter pack 'values'}} 275 276 // CXXDefaultArgExpr is uninteresting 277 278 // CXXBindTemporaryExpr is uninteresting 279 280 // CXXConstructExpr is uninteresting 281 282 // CXXFunctionalCastExpr 283 (void)Types(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 284 285 // CXXTemporaryObjectExpr 286 (void)X(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 287 288 // CXXScalarValueInitExpr is uninteresting 289 290 // CXXNewExpr 291 (void)new Types; // expected-error{{expression contains unexpanded parameter pack 'Types'}} 292 (void)new X(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 293 (void)new (values) X(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 294 (void)new X [values]; // expected-error{{expression contains unexpanded parameter pack 'values'}} 295 296 // CXXDeleteExpr 297 delete values; // expected-error{{expression contains unexpanded parameter pack 'values'}} 298 delete [] values; // expected-error{{expression contains unexpanded parameter pack 'values'}} 299 300 // CXXPseudoDestructorExpr 301 T t; 302 values.~T(); // expected-error{{expression contains unexpanded parameter pack 'values'}} 303 t.~Types(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 304 t.Types::~T(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 305 306 // UnaryTypeTraitExpr 307 __is_pod(Types); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 308 309 // BinaryTypeTraitExpr 310 __is_base_of(Types, T); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 311 __is_base_of(T, Types); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 312 313 // UnresolvedLookupExpr 314 test_unexpanded_exprs(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 315 test_unexpanded_exprs<Types>(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 316 317 // DependentScopeDeclRefExpr 318 Types::test_unexpanded_exprs(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 319 T::template test_unexpanded_exprs<Types>(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 320 321 // CXXUnresolvedConstructExpr 322 Types(5); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 323 324 // CXXDependentScopeMemberExpr 325 values.foo(); // expected-error{{expression contains unexpanded parameter pack 'values'}} 326 t.foo(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 327 328 // FIXME: There's an evil ambiguity here, because we don't know if 329 // Types refers to the template type parameter pack in scope or a 330 // non-pack member. 331 // t.Types::foo(); 332 333 t.template foo<Types>(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 334 335 // UnresolvedMemberExpr 336 x.f<Types>(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 337 x.f(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 338 339 // CXXNoexceptExpr 340 noexcept(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 341 342 // PackExpansionExpr is uninteresting 343 // SizeOfPackExpr is uninteresting 344 345 // FIXME: Objective-C expressions will need to go elsewhere 346 347 for (auto t : values) { } // expected-error{{expression contains unexpanded parameter pack 'values'}} 348 } 349 350 // Test unexpanded parameter packs in partial specializations. 351 template<typename ...Types> 352 struct TestUnexpandedDecls<int, Types>; // expected-error{{partial specialization contains unexpanded parameter pack 'Types'}} 353 354 // Test for diagnostics in the presence of multiple unexpanded 355 // parameter packs. 356 template<typename T, typename U> struct pair; 357 358 template<typename ...OuterTypes> 359 struct MemberTemplatePPNames { 360 template<typename ...InnerTypes> 361 struct Inner { 362 typedef pair<OuterTypes, InnerTypes>* types; // expected-error{{declaration type contains unexpanded parameter packs 'OuterTypes' and 'InnerTypes'}} 363 364 template<typename ...VeryInnerTypes> 365 struct VeryInner { 366 typedef pair<pair<VeryInnerTypes, OuterTypes>, pair<InnerTypes, OuterTypes> > types; // expected-error{{declaration type contains unexpanded parameter packs 'VeryInnerTypes', 'OuterTypes', ...}} 367 }; 368 }; 369 }; 370 371 // Example from working paper 372 namespace WorkingPaperExample { 373 template<typename...> struct Tuple {}; 374 template<typename T1, typename T2> struct Pair {}; 375 376 template<class ... Args1> struct zip { 377 template<class ... Args2> struct with { 378 typedef Tuple<Pair<Args1, Args2> ... > type; // expected-error{{pack expansion contains parameter packs 'Args1' and 'Args2' that have different lengths (1 vs. 2)}} 379 }; 380 }; 381 382 typedef zip<short, int>::with<unsigned short, unsigned>::type T1; // T1 is Tuple<Pair<short, unsigned short>, Pair<int, unsigned>> 383 typedef Tuple<Pair<short, unsigned short>, Pair<int, unsigned>> T1; 384 385 typedef zip<short>::with<unsigned short, unsigned>::type T2; // expected-note{{in instantiation of template class}} 386 387 template<class ... Args> void f(Args...); 388 template<class ... Args> void h(Args...); 389 390 template<class ... Args> 391 void g(Args ... args) { 392 f(const_cast<const Args*>(&args)...); // OK: "Args" and "args" are expanded within f 393 f(5 ...); // expected-error{{pack expansion does not contain any unexpanded parameter packs}} 394 f(args); // expected-error{{expression contains unexpanded parameter pack 'args'}} 395 f(h(args ...) + args ...); 396 } 397 } 398
