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 template<typename T, typename... Types> 164 // FIXME: this should test that the diagnostic reads "type contains..." 165 struct alignas(Types) TestUnexpandedDecls : T{ // expected-error{{expression contains unexpanded parameter pack 'Types'}} 166 void member_function(Types); // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 167 void member_function () throw(Types); // expected-error{{exception 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{{initializer contains unexpanded parameter pack 'Types'}} 189 T list_init = { static_cast<Types>(0) }; // expected-error{{initializer contains unexpanded parameter pack 'Types'}} 190 } 191 192 T in_class_member_init = static_cast<Types>(0); // expected-error{{initializer contains unexpanded parameter pack 'Types'}} 193 TestUnexpandedDecls() : 194 Types(static_cast<Types>(0)), // expected-error{{initializer contains unexpanded parameter pack 'Types'}} 195 Types(static_cast<Types>(0))..., 196 in_class_member_init(static_cast<Types>(0)) {} // expected-error{{initializer contains unexpanded parameter pack 'Types'}} 197 198 void default_function_args(T = static_cast<Types>(0)); // expected-error{{default argument contains unexpanded parameter pack 'Types'}} 199 200 template<typename = Types*> // expected-error{{default argument contains unexpanded parameter pack 'Types'}} 201 struct default_template_args_1; 202 template<int = static_cast<Types>(0)> // expected-error{{default argument contains unexpanded parameter pack 'Types'}} 203 struct default_template_args_2; 204 template<template<typename> class = Types::template apply> // expected-error{{default argument contains unexpanded parameter pack 'Types'}} 205 struct default_template_args_3; 206 207 template<Types value> // expected-error{{non-type template parameter type contains unexpanded parameter pack 'Types'}} 208 struct non_type_template_param_type; 209 210 void decls_in_stmts() { 211 Types t; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 212 for (Types *t = 0; ; ) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 213 for (; Types *t = 0; ) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 214 T a[] = { T(), T(), T() }; 215 for (Types t : a) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 216 switch(Types *t = 0) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 217 while(Types *t = 0) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 218 if (Types *t = 0) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 219 try { 220 } catch (Types*) { // expected-error{{exception type contains unexpanded parameter pack 'Types'}} 221 } 222 } 223 }; 224 225 // FIXME: Test for unexpanded parameter packs in each of the statements. 226 struct X { 227 void f(int, int); 228 template<typename ...Types> 229 void f(Types...); 230 }; 231 232 namespace std { 233 class type_info; 234 } 235 236 typedef struct _GUID { 237 unsigned long Data1; 238 unsigned short Data2; 239 unsigned short Data3; 240 unsigned char Data4[ 8 ]; 241 } GUID; 242 243 template<typename T, typename ...Types> 244 void test_unexpanded_exprs(Types ...values) { 245 // CXXOperatorCallExpr 246 (void)(values + 0); // expected-error{{expression contains unexpanded parameter pack 'values'}} 247 (void)(0 + values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 248 249 // CXXMemberCallExpr 250 values.f(); // expected-error{{expression contains unexpanded parameter pack 'values'}} 251 X x; 252 x.f(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 253 x.Types::f(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 254 x.f<Types>(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 255 256 // CXXStaticCastExpr 257 (void)static_cast<Types&>(values); // expected-error{{expression contains unexpanded parameter packs 'Types' and 'values'}} 258 259 // CXXDynamicCastExpr 260 (void)dynamic_cast<Types&>(values); // expected-error{{expression contains unexpanded parameter packs 'Types' and 'values'}} 261 262 // CXXReinterpretCastExpr 263 (void)reinterpret_cast<Types&>(values); // expected-error{{expression contains unexpanded parameter packs 'Types' and 'values'}} 264 265 // CXXConstCastExpr 266 (void)const_cast<Types&>(values); // expected-error{{expression contains unexpanded parameter packs 'Types' and 'values'}} 267 268 // CXXTypeidExpr 269 (void)typeid(Types); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 270 (void)typeid(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 271 272 // CXXUuidofExpr 273 (void)__uuidof(Types); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 274 (void)__uuidof(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 275 276 // CXXThisExpr is uninteresting 277 278 // CXXThrowExpr 279 throw Types(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 280 throw values; // expected-error{{expression contains unexpanded parameter pack 'values'}} 281 282 // CXXDefaultArgExpr is uninteresting 283 284 // CXXBindTemporaryExpr is uninteresting 285 286 // CXXConstructExpr is uninteresting 287 288 // CXXFunctionalCastExpr 289 (void)Types(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 290 291 // CXXTemporaryObjectExpr 292 (void)X(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 293 294 // CXXScalarValueInitExpr is uninteresting 295 296 // CXXNewExpr 297 (void)new Types; // expected-error{{expression contains unexpanded parameter pack 'Types'}} 298 (void)new X(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 299 (void)new (values) X(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 300 (void)new X [values]; // expected-error{{expression contains unexpanded parameter pack 'values'}} 301 302 // CXXDeleteExpr 303 delete values; // expected-error{{expression contains unexpanded parameter pack 'values'}} 304 delete [] values; // expected-error{{expression contains unexpanded parameter pack 'values'}} 305 306 // CXXPseudoDestructorExpr 307 T t; 308 values.~T(); // expected-error{{expression contains unexpanded parameter pack 'values'}} 309 t.~Types(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 310 t.Types::~T(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 311 312 // UnaryTypeTraitExpr 313 __is_pod(Types); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 314 315 // BinaryTypeTraitExpr 316 __is_base_of(Types, T); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 317 __is_base_of(T, Types); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 318 319 // UnresolvedLookupExpr 320 test_unexpanded_exprs(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 321 test_unexpanded_exprs<Types>(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 322 323 // DependentScopeDeclRefExpr 324 Types::test_unexpanded_exprs(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 325 T::template test_unexpanded_exprs<Types>(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 326 327 // CXXUnresolvedConstructExpr 328 Types(5); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 329 330 // CXXDependentScopeMemberExpr 331 values.foo(); // expected-error{{expression contains unexpanded parameter pack 'values'}} 332 t.foo(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 333 334 // FIXME: There's an evil ambiguity here, because we don't know if 335 // Types refers to the template type parameter pack in scope or a 336 // non-pack member. 337 // t.Types::foo(); 338 339 t.template foo<Types>(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 340 341 // UnresolvedMemberExpr 342 x.f<Types>(); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 343 x.f(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 344 345 // CXXNoexceptExpr 346 noexcept(values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 347 348 // PackExpansionExpr is uninteresting 349 // SizeOfPackExpr is uninteresting 350 351 // FIXME: Objective-C expressions will need to go elsewhere 352 353 for (auto t : values) { } // expected-error{{expression contains unexpanded parameter pack 'values'}} 354 355 switch (values) { } // expected-error{{expression contains unexpanded parameter pack 'values'}} 356 357 do { } while (values); // expected-error{{expression contains unexpanded parameter pack 'values'}} 358 359 test: 360 goto *values; // expected-error{{expression contains unexpanded parameter pack 'values'}} 361 362 void f(int arg = values); // expected-error{{default argument contains unexpanded parameter pack 'values'}} 363 } 364 365 // Test unexpanded parameter packs in partial specializations. 366 template<typename ...Types> 367 struct TestUnexpandedDecls<int, Types>; // expected-error{{partial specialization contains unexpanded parameter pack 'Types'}} 368 369 // Test for diagnostics in the presence of multiple unexpanded 370 // parameter packs. 371 template<typename T, typename U> struct pair; 372 373 template<typename ...OuterTypes> 374 struct MemberTemplatePPNames { 375 template<typename ...InnerTypes> 376 struct Inner { 377 typedef pair<OuterTypes, InnerTypes>* types; // expected-error{{declaration type contains unexpanded parameter packs 'OuterTypes' and 'InnerTypes'}} 378 379 template<typename ...VeryInnerTypes> 380 struct VeryInner { 381 typedef pair<pair<VeryInnerTypes, OuterTypes>, pair<InnerTypes, OuterTypes> > types; // expected-error{{declaration type contains unexpanded parameter packs 'VeryInnerTypes', 'OuterTypes', ...}} 382 }; 383 }; 384 }; 385 386 // Example from working paper 387 namespace WorkingPaperExample { 388 template<typename...> struct Tuple {}; 389 template<typename T1, typename T2> struct Pair {}; 390 391 template<class ... Args1> struct zip { 392 template<class ... Args2> struct with { 393 typedef Tuple<Pair<Args1, Args2> ... > type; // expected-error{{pack expansion contains parameter packs 'Args1' and 'Args2' that have different lengths (1 vs. 2)}} 394 }; 395 }; 396 397 typedef zip<short, int>::with<unsigned short, unsigned>::type T1; // T1 is Tuple<Pair<short, unsigned short>, Pair<int, unsigned>> 398 typedef Tuple<Pair<short, unsigned short>, Pair<int, unsigned>> T1; 399 400 typedef zip<short>::with<unsigned short, unsigned>::type T2; // expected-note{{in instantiation of template class}} 401 402 template<class ... Args> void f(Args...); 403 template<class ... Args> void h(Args...); 404 405 template<class ... Args> 406 void g(Args ... args) { 407 f(const_cast<const Args*>(&args)...); // OK: "Args" and "args" are expanded within f 408 f(5 ...); // expected-error{{pack expansion does not contain any unexpanded parameter packs}} 409 f(args); // expected-error{{expression contains unexpanded parameter pack 'args'}} 410 f(h(args ...) + args ...); 411 } 412 } 413
