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 | 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. |
227 | struct X { |
228 | void f(int, int); |
229 | template<typename ...Types> |
230 | void f(Types...); |
231 | }; |
232 | |
233 | namespace std { |
234 | class type_info; |
235 | } |
236 | |
237 | typedef struct _GUID { |
238 | unsigned long Data1; |
239 | unsigned short Data2; |
240 | unsigned short Data3; |
241 | unsigned char Data4[ 8 ]; |
242 | } GUID; |
243 | |
244 | template<typename T, typename ...Types> |
245 | void 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 | switch (0) { case 0: case values: ; } // expected-error{{expression contains unexpanded parameter pack 'values'}} |
358 | |
359 | do { } while (values); // expected-error{{expression contains unexpanded parameter pack 'values'}} |
360 | |
361 | test: |
362 | goto *values; // expected-error{{expression contains unexpanded parameter pack 'values'}} |
363 | |
364 | void f(int arg = values); // expected-error{{default argument contains unexpanded parameter pack 'values'}} |
365 | } |
366 | |
367 | // Test unexpanded parameter packs in partial specializations. |
368 | template<typename ...Types> |
369 | struct TestUnexpandedDecls<int, Types>; // expected-error{{partial specialization contains unexpanded parameter pack 'Types'}} |
370 | |
371 | // Test for diagnostics in the presence of multiple unexpanded |
372 | // parameter packs. |
373 | template<typename T, typename U> struct pair; |
374 | |
375 | template<typename ...OuterTypes> |
376 | struct MemberTemplatePPNames { |
377 | template<typename ...InnerTypes> |
378 | struct Inner { |
379 | typedef pair<OuterTypes, InnerTypes>* types; // expected-error{{declaration type contains unexpanded parameter packs 'OuterTypes' and 'InnerTypes'}} |
380 | |
381 | template<typename ...VeryInnerTypes> |
382 | struct VeryInner { |
383 | typedef pair<pair<VeryInnerTypes, OuterTypes>, pair<InnerTypes, OuterTypes> > types; // expected-error{{declaration type contains unexpanded parameter packs 'VeryInnerTypes', 'OuterTypes', ...}} |
384 | }; |
385 | }; |
386 | }; |
387 | |
388 | // Example from working paper |
389 | namespace WorkingPaperExample { |
390 | template<typename...> struct Tuple {}; |
391 | template<typename T1, typename T2> struct Pair {}; |
392 | |
393 | template<class ... Args1> struct zip { |
394 | template<class ... Args2> struct with { |
395 | typedef Tuple<Pair<Args1, Args2> ... > type; // expected-error{{pack expansion contains parameter packs 'Args1' and 'Args2' that have different lengths (1 vs. 2)}} |
396 | }; |
397 | }; |
398 | |
399 | typedef zip<short, int>::with<unsigned short, unsigned>::type T1; // T1 is Tuple<Pair<short, unsigned short>, Pair<int, unsigned>> |
400 | typedef Tuple<Pair<short, unsigned short>, Pair<int, unsigned>> T1; |
401 | |
402 | typedef zip<short>::with<unsigned short, unsigned>::type T2; // expected-note{{in instantiation of template class}} |
403 | |
404 | template<class ... Args> void f(Args...); |
405 | template<class ... Args> void h(Args...); |
406 | |
407 | template<class ... Args> |
408 | void g(Args ... args) { |
409 | f(const_cast<const Args*>(&args)...); // OK: "Args" and "args" are expanded within f |
410 | f(5 ...); // expected-error{{pack expansion does not contain any unexpanded parameter packs}} |
411 | f(args); // expected-error{{expression contains unexpanded parameter pack 'args'}} |
412 | f(h(args ...) + args ...); |
413 | } |
414 | } |
415 | |
416 | namespace PR16303 { |
417 | template<int> struct A { A(int); }; |
418 | template<int...N> struct B { |
419 | template<int...M> struct C : A<N>... { |
420 | 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)}} |
421 | }; |
422 | }; |
423 | B<1,2>::C<4,5,6> c1; // expected-note{{in instantiation of}} |
424 | B<1,2,3,4>::C<4,5,6> c2; // expected-note{{in instantiation of}} |
425 | } |
426 | |
427 | namespace PR21289 { |
428 | template<int> using T = int; |
429 | template<typename> struct S { static const int value = 0; }; |
430 | template<typename> const int vt = 0; // expected-warning {{extension}} |
431 | int f(...); |
432 | template<int ...Ns> void g() { |
433 | f(T<Ns>()...); |
434 | f(S<T<Ns>>::value...); |
435 | f(vt<T<Ns>>...); |
436 | } |
437 | template void g<>(); |
438 | template void g<1, 2, 3>(); |
439 | } |
440 | |
441 | template <class... Ts> |
442 | int var_expr(Ts... ts); |
443 | |
444 | template <class... Ts> |
445 | auto a_function(Ts... ts) -> decltype(var_expr(ts...)); |
446 | |
447 | template <class T> |
448 | using partial = decltype(a_function<int, T>); |
449 | |
450 | int use_partial() { partial<char> n; } |
451 | |
452 | namespace PR26017 { |
453 | template <class T> |
454 | struct Foo {}; |
455 | template <class... Ts> |
456 | using FooAlias = Foo<void(Ts...)>; |
457 | |
458 | template <class... Ts> |
459 | using FooAliasAlias = FooAlias<Ts..., Ts...>; |
460 | |
461 | template <class... Ts> |
462 | void bar(const FooAlias<Ts...> &) {} |
463 | |
464 | int fn() { |
465 | FooAlias<> a; |
466 | bar(a); |
467 | |
468 | FooAlias<int> b; |
469 | bar(b); |
470 | } |
471 | } |
472 | |