1// RUN: %clang_cc1 -fcxx-exceptions -fexceptions -std=c++11 -fblocks -fms-extensions -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.
163template<typename T, typename... Types>
164// FIXME: this should test that the diagnostic reads "type contains..."
165struct 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  void member_function2() noexcept(Types()); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
169  operator Types() const; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
170  Types data_member;  // expected-error{{data member type contains unexpanded parameter pack 'Types'}}
171  static Types static_data_member; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
172  unsigned bit_field : static_cast<Types>(0);  // expected-error{{bit-field size contains unexpanded parameter pack 'Types'}}
173  static_assert(static_cast<Types>(0), "Boom"); // expected-error{{static assertion contains unexpanded parameter pack 'Types'}}
174
175  enum E0 : Types {  // expected-error{{fixed underlying type contains unexpanded parameter pack 'Types'}}
176    EnumValue = static_cast<Types>(0) // expected-error{{enumerator value contains unexpanded parameter pack 'Types'}}
177  };
178
179  using typename Types::type; // expected-error{{using declaration contains unexpanded parameter pack 'Types'}}
180  using Types::value; // expected-error{{using declaration contains unexpanded parameter pack 'Types'}}
181  using T::operator Types; // expected-error{{using declaration contains unexpanded parameter pack 'Types'}}
182
183  friend class Types::foo; // expected-error{{friend declaration contains unexpanded parameter pack 'Types'}}
184  friend void friend_func(Types); // expected-error{{friend declaration contains unexpanded parameter pack 'Types'}}
185  friend void Types::other_friend_func(int); // expected-error{{friend declaration contains unexpanded parameter pack 'Types'}}
186
187  void test_initializers() {
188    T copy_init = static_cast<Types>(0); // expected-error{{initializer contains unexpanded parameter pack 'Types'}}
189    T direct_init(0, static_cast<Types>(0)); // expected-error{{initializer contains unexpanded parameter pack 'Types'}}
190    T list_init = { static_cast<Types>(0) }; // expected-error{{initializer contains unexpanded parameter pack 'Types'}}
191  }
192
193  T in_class_member_init = static_cast<Types>(0); // expected-error{{initializer contains unexpanded parameter pack 'Types'}}
194  TestUnexpandedDecls() :
195    Types(static_cast<Types>(0)), // expected-error{{initializer contains unexpanded parameter pack 'Types'}}
196    Types(static_cast<Types>(0))...,
197    in_class_member_init(static_cast<Types>(0)) {} // expected-error{{initializer contains unexpanded parameter pack 'Types'}}
198
199  void default_function_args(T = static_cast<Types>(0)); // expected-error{{default argument contains unexpanded parameter pack 'Types'}}
200
201  template<typename = Types*> // expected-error{{default argument contains unexpanded parameter pack 'Types'}}
202    struct default_template_args_1;
203  template<int = static_cast<Types>(0)> // expected-error{{default argument contains unexpanded parameter pack 'Types'}}
204    struct default_template_args_2;
205  template<template<typename> class = Types::template apply> // expected-error{{default argument contains unexpanded parameter pack 'Types'}}
206    struct default_template_args_3;
207
208  template<Types value> // expected-error{{non-type template parameter type contains unexpanded parameter pack 'Types'}}
209  struct non_type_template_param_type;
210
211  void decls_in_stmts() {
212    Types t; // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
213    for (Types *t = 0; ; ) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
214    for (; Types *t = 0; ) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
215    T a[] = { T(), T(), T() };
216    for (Types t : a) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
217    switch(Types *t = 0) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
218    while(Types *t = 0) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
219    if (Types *t = 0) { } // expected-error{{declaration type contains unexpanded parameter pack 'Types'}}
220    try {
221    } catch (Types*) { // expected-error{{exception type contains unexpanded parameter pack 'Types'}}
222    }
223  }
224};
225
226// FIXME: Test for unexpanded parameter packs in each of the statements.
227struct X {
228  void f(int, int);
229  template<typename ...Types>
230  void f(Types...);
231};
232
233namespace std {
234  class type_info;
235}
236
237typedef struct _GUID {
238     unsigned long  Data1;
239     unsigned short Data2;
240     unsigned short Data3;
241     unsigned char  Data4[ 8 ];
242} GUID;
243
244template<typename T, typename ...Types>
245void test_unexpanded_exprs(Types ...values) {
246  // CXXOperatorCallExpr
247  (void)(values + 0); // expected-error{{expression contains unexpanded parameter pack 'values'}}
248  (void)(0 + values); // expected-error{{expression contains unexpanded parameter pack 'values'}}
249
250  // CXXMemberCallExpr
251  values.f(); // expected-error{{expression contains unexpanded parameter pack 'values'}}
252  X x;
253  x.f(values); // expected-error{{expression contains unexpanded parameter pack 'values'}}
254  x.Types::f(); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
255  x.f<Types>(); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
256
257  // CXXStaticCastExpr
258  (void)static_cast<Types&>(values); // expected-error{{expression contains unexpanded parameter packs 'Types' and 'values'}}
259
260  // CXXDynamicCastExpr
261  (void)dynamic_cast<Types&>(values); // expected-error{{expression contains unexpanded parameter packs 'Types' and 'values'}}
262
263  // CXXReinterpretCastExpr
264  (void)reinterpret_cast<Types&>(values); // expected-error{{expression contains unexpanded parameter packs 'Types' and 'values'}}
265
266  // CXXConstCastExpr
267  (void)const_cast<Types&>(values); // expected-error{{expression contains unexpanded parameter packs 'Types' and 'values'}}
268
269  // CXXTypeidExpr
270  (void)typeid(Types); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
271  (void)typeid(values); // expected-error{{expression contains unexpanded parameter pack 'values'}}
272
273  // CXXUuidofExpr
274  (void)__uuidof(Types); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
275  (void)__uuidof(values); // expected-error{{expression contains unexpanded parameter pack 'values'}}
276
277  // CXXThisExpr is uninteresting
278
279  // CXXThrowExpr
280  throw Types(); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
281  throw values; // expected-error{{expression contains unexpanded parameter pack 'values'}}
282
283  // CXXDefaultArgExpr is uninteresting
284
285  // CXXBindTemporaryExpr is uninteresting
286
287  // CXXConstructExpr is uninteresting
288
289  // CXXFunctionalCastExpr
290  (void)Types(); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
291
292  // CXXTemporaryObjectExpr
293  (void)X(values); // expected-error{{expression contains unexpanded parameter pack 'values'}}
294
295  // CXXScalarValueInitExpr is uninteresting
296
297  // CXXNewExpr
298  (void)new Types; // expected-error{{expression contains unexpanded parameter pack 'Types'}}
299  (void)new X(values); // expected-error{{expression contains unexpanded parameter pack 'values'}}
300  (void)new (values) X(values); // expected-error{{expression contains unexpanded parameter pack 'values'}}
301  (void)new X [values]; // expected-error{{expression contains unexpanded parameter pack 'values'}}
302
303  // CXXDeleteExpr
304  delete values; // expected-error{{expression contains unexpanded parameter pack 'values'}}
305  delete [] values; // expected-error{{expression contains unexpanded parameter pack 'values'}}
306
307  // CXXPseudoDestructorExpr
308  T t;
309  values.~T(); // expected-error{{expression contains unexpanded parameter pack 'values'}}
310  t.~Types(); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
311  t.Types::~T(); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
312
313  // Unary TypeTraitExpr
314  __is_pod(Types); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
315
316  // Binary TypeTraitExpr
317  __is_base_of(Types, T); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
318  __is_base_of(T, Types); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
319
320  // UnresolvedLookupExpr
321  test_unexpanded_exprs(values); // expected-error{{expression contains unexpanded parameter pack 'values'}}
322  test_unexpanded_exprs<Types>(); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
323
324  // DependentScopeDeclRefExpr
325  Types::test_unexpanded_exprs(); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
326  T::template test_unexpanded_exprs<Types>(); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
327
328  // CXXUnresolvedConstructExpr
329  Types(5); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
330
331  // CXXDependentScopeMemberExpr
332  values.foo(); // expected-error{{expression contains unexpanded parameter pack 'values'}}
333  t.foo(values); // expected-error{{expression contains unexpanded parameter pack 'values'}}
334
335  // FIXME: There's an evil ambiguity here, because we don't know if
336  // Types refers to the template type parameter pack in scope or a
337  // non-pack member.
338  //  t.Types::foo();
339
340  t.template foo<Types>(); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
341
342  // UnresolvedMemberExpr
343  x.f<Types>(); // expected-error{{expression contains unexpanded parameter pack 'Types'}}
344  x.f(values); // expected-error{{expression contains unexpanded parameter pack 'values'}}
345
346  // CXXNoexceptExpr
347  noexcept(values); // expected-error{{expression contains unexpanded parameter pack 'values'}}
348
349  // PackExpansionExpr is uninteresting
350  // SizeOfPackExpr is uninteresting
351
352  // FIXME: Objective-C expressions will need to go elsewhere
353
354  for (auto t : values) { } // expected-error{{expression contains unexpanded parameter pack 'values'}}
355
356  switch (values) { } // expected-error{{expression contains unexpanded parameter pack 'values'}}
357
358  do { } while (values); // expected-error{{expression contains unexpanded parameter pack 'values'}}
359
360test:
361  goto *values; // expected-error{{expression contains unexpanded parameter pack 'values'}}
362
363  void f(int arg = values); // expected-error{{default argument contains unexpanded parameter pack 'values'}}
364}
365
366// Test unexpanded parameter packs in partial specializations.
367template<typename ...Types>
368struct TestUnexpandedDecls<int, Types>; // expected-error{{partial specialization contains unexpanded parameter pack 'Types'}}
369
370// Test for diagnostics in the presence of multiple unexpanded
371// parameter packs.
372template<typename T, typename U> struct pair;
373
374template<typename ...OuterTypes>
375struct MemberTemplatePPNames {
376  template<typename ...InnerTypes>
377  struct Inner {
378    typedef pair<OuterTypes, InnerTypes>* types; // expected-error{{declaration type contains unexpanded parameter packs 'OuterTypes' and 'InnerTypes'}}
379
380    template<typename ...VeryInnerTypes>
381    struct VeryInner {
382      typedef pair<pair<VeryInnerTypes, OuterTypes>, pair<InnerTypes, OuterTypes> > types; // expected-error{{declaration type contains unexpanded parameter packs 'VeryInnerTypes', 'OuterTypes', ...}}
383    };
384  };
385};
386
387// Example from working paper
388namespace WorkingPaperExample {
389  template<typename...> struct Tuple {};
390  template<typename T1, typename T2> struct Pair {};
391
392  template<class ... Args1> struct zip {
393    template<class ... Args2> struct with {
394      typedef Tuple<Pair<Args1, Args2> ... > type; // expected-error{{pack expansion contains parameter packs 'Args1' and 'Args2' that have different lengths (1 vs. 2)}}
395    };
396  };
397
398  typedef zip<short, int>::with<unsigned short, unsigned>::type T1; // T1 is Tuple<Pair<short, unsigned short>, Pair<int, unsigned>>
399  typedef Tuple<Pair<short, unsigned short>, Pair<int, unsigned>> T1;
400
401  typedef zip<short>::with<unsigned short, unsigned>::type T2; // expected-note{{in instantiation of template class}}
402
403  template<class ... Args> void f(Args...);
404  template<class ... Args> void h(Args...);
405
406  template<class ... Args>
407  void g(Args ... args) {
408    f(const_cast<const Args*>(&args)...); // OK: "Args" and "args" are expanded within f
409    f(5 ...); // expected-error{{pack expansion does not contain any unexpanded parameter packs}}
410    f(args); // expected-error{{expression contains unexpanded parameter pack 'args'}}
411    f(h(args ...) + args ...);
412  }
413}
414
415namespace PR16303 {
416  template<int> struct A { A(int); };
417  template<int...N> struct B {
418    template<int...M> struct C : A<N>... {
419      C() : A<N>(M)... {} // expected-error{{pack expansion contains parameter packs 'N' and 'M' that have different lengths (2 vs. 3)}} expected-error{{pack expansion contains parameter packs 'N' and 'M' that have different lengths (4 vs. 3)}}
420    };
421  };
422  B<1,2>::C<4,5,6> c1; // expected-note{{in instantiation of}}
423  B<1,2,3,4>::C<4,5,6> c2; // expected-note{{in instantiation of}}
424}
425