p5.cpp revision 12c9c00024a01819e3a70ef6d951d32efaeb9312
1// RUN: %clang_cc1 -std=c++0x -fblocks -fsyntax-only -verify %s 2 3template<typename T, typename U> struct pair; 4template<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. 12template<typename... Types> 13struct 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. 21template<typename ...Types> 22struct 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 29ExpansionLengthMismatch<int, long>::Inner<unsigned int, unsigned long>::type 30 *il_pairs; 31tuple<pair<int, unsigned int>, pair<long, unsigned long> >*il_pairs_2 = il_pairs; 32 33ExpansionLengthMismatch<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. 41template<typename T, int N, typename ... Types> 42struct 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. 131template<int ...Values> 132void 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 152template<typename ... Types> 153void TestPPNameFunc(int i) { 154 f(static_cast<Types>(i)); // expected-error{{expression contains unexpanded parameter pack 'Types'}} 155} 156 157template<typename T, template<class> class ...Meta> 158struct 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? 164template<typename T, typename... Types> 165struct 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 switch(Types *t = 0) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 209 while(Types *t = 0) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 210 if (Types *t = 0) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}} 211 try { 212 } catch (Types*) { // expected-error{{exception type contains unexpanded parameter pack 'Types'}} 213 } 214 } 215}; 216 217// FIXME: Test for unexpanded parameter packs in each of the statements. 218 219// Test unexpanded parameter packs in partial specializations. 220template<typename ...Types> 221struct TestUnexpandedDecls<int, Types>; // expected-error{{partial specialization contains unexpanded parameter pack 'Types'}} 222 223// Test for diagnostics in the presence of multiple unexpanded 224// parameter packs. 225template<typename T, typename U> struct pair; 226 227template<typename ...OuterTypes> 228struct MemberTemplatePPNames { 229 template<typename ...InnerTypes> 230 struct Inner { 231 typedef pair<OuterTypes, InnerTypes>* types; // expected-error{{declaration type contains unexpanded parameter packs 'OuterTypes' and 'InnerTypes'}} 232 233 template<typename ...VeryInnerTypes> 234 struct VeryInner { 235 typedef pair<pair<VeryInnerTypes, OuterTypes>, pair<InnerTypes, OuterTypes> > types; // expected-error{{declaration type contains unexpanded parameter packs 'VeryInnerTypes', 'OuterTypes', ...}} 236 }; 237 }; 238}; 239 240// Example from working paper 241namespace WorkingPaperExample { 242 template<typename...> struct Tuple {}; 243 template<typename T1, typename T2> struct Pair {}; 244 245 template<class ... Args1> struct zip { 246 template<class ... Args2> struct with { 247 typedef Tuple<Pair<Args1, Args2> ... > type; // expected-error{{pack expansion contains parameter packs 'Args1' and 'Args2' that have different lengths (1 vs. 2)}} 248 }; 249 }; 250 251 typedef zip<short, int>::with<unsigned short, unsigned>::type T1; // T1 is Tuple<Pair<short, unsigned short>, Pair<int, unsigned>> 252 typedef Tuple<Pair<short, unsigned short>, Pair<int, unsigned>> T1; 253 254 typedef zip<short>::with<unsigned short, unsigned>::type T2; // expected-note{{in instantiation of template class}} 255 256 template<class ... Args> void f(Args...); 257 template<class ... Args> void h(Args...); 258 259 template<class ... Args> 260 void g(Args ... args) { 261 f(const_cast<const Args*>(&args)...); // OK: "Args" and "args" are expanded within f 262 f(5 ...); // expected-error{{pack expansion does not contain any unexpanded parameter packs}} 263 f(args); // expected-error{{expression contains unexpanded parameter pack 'args'}} 264 f(h(args ...) + args ...); 265 } 266} 267