1 // RUN: %clang_cc1 -fcxx-exceptions -fexceptions -std=c++1y -fms-compatibility -fno-spell-checking -fsyntax-only -verify %s
2
3
4 template <class T>
5 class A {
6 public:
f(T a)7 void f(T a) { }// expected-note 2{{must qualify identifier to find this declaration in dependent base class}}
8 void g();// expected-note 2{{must qualify identifier to find this declaration in dependent base class}}
9 };
10
11 template <class T>
12 class B : public A<T> {
13 public:
z(T a)14 void z(T a)
15 {
16 f(a); // expected-warning 2{{use of identifier 'f' found via unqualified lookup into dependent bases of class templates is a Microsoft extension}}
17 g(); // expected-warning 2{{use of identifier 'g' found via unqualified lookup into dependent bases of class templates is a Microsoft extension}}
18 }
19 };
20
21 template class B<int>; // expected-note {{requested here}}
22 template class B<char>; // expected-note {{requested here}}
23
test()24 void test()
25 {
26 B<int> b;
27 b.z(3);
28 }
29
30 struct A2 {
fA231 template<class T> void f(T) {
32 XX; //expected-error {{use of undeclared identifier 'XX'}}
33 A2::XX; //expected-error {{no member named 'XX' in 'A2'}}
34 }
35 };
36 template void A2::f(int);
37
38 template<class T0>
39 struct A3 {
fA340 template<class T1> void f(T1) {
41 XX; //expected-error {{use of undeclared identifier 'XX'}}
42 }
43 };
44 template void A3<int>::f(int);
45
46 template<class T0>
47 struct A4 {
fA448 void f(char) {
49 XX; //expected-error {{use of undeclared identifier 'XX'}}
50 }
51 };
52 template class A4<int>;
53
54
55 namespace lookup_dependent_bases_id_expr {
56
57 template<class T> class A {
58 public:
59 int var;
60 };
61
62
63 template<class T>
64 class B : public A<T> {
65 public:
f()66 void f() {
67 var = 3; // expected-warning {{use of undeclared identifier 'var'; unqualified lookup into dependent bases of class template 'B' is a Microsoft extension}}
68 }
69 };
70
71 template class B<int>;
72
73 }
74
75
76
77 namespace lookup_dependent_base_class_static_function {
78
79 template <class T>
80 class A {
81 public:
82 static void static_func();// expected-note {{must qualify identifier to find this declaration in dependent base class}}
83 void func();// expected-note {{must qualify identifier to find this declaration in dependent base class}}
84 };
85
86
87 template <class T>
88 class B : public A<T> {
89 public:
z2()90 static void z2(){
91 static_func(); // expected-warning {{use of identifier 'static_func' found via unqualified lookup into dependent bases of class templates is a Microsoft extension}}
92 func(); // expected-warning {{use of identifier 'func' found via unqualified lookup into dependent bases of class templates is a Microsoft extension}} expected-error {{call to non-static member function without an object argument}}
93 }
94 };
95 template class B<int>; // expected-note {{requested here}}
96
97 }
98
99
100
101 namespace lookup_dependent_base_class_default_argument {
102
103 template<class T>
104 class A {
105 public:
106 static int f1(); // expected-note {{must qualify identifier to find this declaration in dependent base class}}
107 int f2(); // expected-note {{must qualify identifier to find this declaration in dependent base class}}
108 };
109
110 template<class T>
111 class B : public A<T> {
112 public:
113 void g1(int p = f1());// expected-warning {{use of identifier 'f1' found via unqualified lookup into dependent bases of class templates is a Microsoft extension}}
114 void g2(int p = f2());// expected-warning {{use of identifier 'f2' found via unqualified lookup into dependent bases of class templates is a Microsoft extension}} expected-error {{call to non-static member function without an object argument}}
115 };
116
foo()117 void foo()
118 {
119 B<int> b;
120 b.g1(); // expected-note {{required here}}
121 b.g2(); // expected-note {{required here}}
122 }
123
124 }
125
126
127 namespace lookup_dependent_base_class_friend {
128
129 template <class T>
130 class B {
131 public:
132 static void g(); // expected-note {{must qualify identifier to find this declaration in dependent base class}}
133 };
134
135 template <class T>
136 class A : public B<T> {
137 public:
foo(A<T> p)138 friend void foo(A<T> p){
139 g(); // expected-warning {{use of identifier 'g' found via unqualified lookup into dependent bases of class templates is a Microsoft extension}}
140 }
141 };
142
main2()143 int main2()
144 {
145 A<int> a;
146 foo(a); // expected-note {{requested here}}
147 }
148
149 }
150
151
152 namespace lookup_dependent_base_no_typo_correction {
153
154 class C {
155 public:
156 int m_hWnd;
157 };
158
159 template <class T>
160 class A : public T {
161 public:
f(int hWnd)162 void f(int hWnd) {
163 m_hWnd = 1; // expected-warning {{use of undeclared identifier 'm_hWnd'; unqualified lookup into dependent bases of class template 'A' is a Microsoft extension}}
164 }
165 };
166
167 template class A<C>;
168
169 }
170
171 namespace PR12701 {
172
173 class A {};
174 class B {};
175
176 template <class T>
177 class Base {
178 public:
base_fun(void * p)179 bool base_fun(void* p) { return false; } // expected-note {{must qualify identifier to find this declaration in dependent base class}}
operator T*() const180 operator T*() const { return 0; }
181 };
182
183 template <class T>
184 class Container : public Base<T> {
185 public:
186 template <typename S>
operator =(const Container<S> & rhs)187 bool operator=(const Container<S>& rhs) {
188 return base_fun(rhs); // expected-warning {{use of identifier 'base_fun' found via unqualified lookup into dependent bases of class templates is a Microsoft extension}}
189 }
190 };
191
f()192 void f() {
193 Container<A> text_provider;
194 Container<B> text_provider2;
195 text_provider2 = text_provider; // expected-note {{in instantiation of function template specialization}}
196 }
197
198 } // namespace PR12701
199
200 namespace PR16014 {
201
202 struct A {
203 int a;
204 static int sa;
205 };
206 template <typename T> struct B : T {
fooPR16014::B207 int foo() { return a; } // expected-warning {{lookup into dependent bases}}
barPR16014::B208 int *bar() { return &a; } // expected-warning {{lookup into dependent bases}}
bazPR16014::B209 int baz() { return T::a; }
quxPR16014::B210 int T::*qux() { return &T::a; }
stuffPR16014::B211 static int T::*stuff() { return &T::a; }
stuff1PR16014::B212 static int stuff1() { return T::sa; }
stuff2PR16014::B213 static int *stuff2() { return &T::sa; }
stuff3PR16014::B214 static int stuff3() { return sa; } // expected-warning {{lookup into dependent bases}}
stuff4PR16014::B215 static int *stuff4() { return &sa; } // expected-warning {{lookup into dependent bases}}
216 };
217
218 template <typename T> struct C : T {
fooPR16014::C219 int foo() { return b; } // expected-error {{no member named 'b' in 'PR16014::C<PR16014::A>'}} expected-warning {{lookup into dependent bases}}
barPR16014::C220 int *bar() { return &b; } // expected-error {{no member named 'b' in 'PR16014::C<PR16014::A>'}} expected-warning {{lookup into dependent bases}}
bazPR16014::C221 int baz() { return T::b; } // expected-error {{no member named 'b' in 'PR16014::A'}}
quxPR16014::C222 int T::*qux() { return &T::b; } // expected-error {{no member named 'b' in 'PR16014::A'}}
fuzPR16014::C223 int T::*fuz() { return &U::a; } // expected-error {{use of undeclared identifier 'U'}} \
224 // expected-warning {{unqualified lookup into dependent bases of class template 'C'}}
225 };
226
227 template struct B<A>;
228 template struct C<A>; // expected-note-re 1+ {{in instantiation of member function 'PR16014::C<PR16014::A>::{{.*}}' requested here}}
229
230 template <typename T> struct D : T {
231 struct Inner {
fooPR16014::D::Inner232 int foo() {
233 // FIXME: MSVC can find this in D's base T! Even worse, if ::sa exists,
234 // clang will use it instead.
235 return sa; // expected-error {{use of undeclared identifier 'sa'}}
236 }
237 };
238 };
239 template struct D<A>;
240
241 }
242
243 namespace PR19233 {
244 template <class T>
245 struct A : T {
fooPR19233::A246 void foo() {
247 ::undef(); // expected-error {{no member named 'undef' in the global namespace}}
248 }
barPR19233::A249 void bar() {
250 ::UndefClass::undef(); // expected-error {{no member named 'UndefClass' in the global namespace}}
251 }
bazPR19233::A252 void baz() {
253 B::qux(); // expected-error {{use of undeclared identifier 'B'}} \
254 // expected-warning {{unqualified lookup into dependent bases of class template 'A'}}
255 }
256 };
257
258 struct B { void qux(); };
259 struct C : B { };
260 template struct A<C>; // No error! B is a base of A<C>, and qux is available.
261
262 struct D { };
263 template struct A<D>; // expected-note {{in instantiation of member function 'PR19233::A<PR19233::D>::baz' requested here}}
264
265 }
266
267 namespace nonmethod_missing_this {
268 template <typename T> struct Base { int y = 42; };
269 template <typename T> struct Derived : Base<T> {
270 int x = y; // expected-warning {{lookup into dependent bases}}
foononmethod_missing_this::Derived271 auto foo(int j) -> decltype(y * j) { // expected-warning {{lookup into dependent bases}}
272 return y * j; // expected-warning {{lookup into dependent bases}}
273 }
barnonmethod_missing_this::Derived274 int bar() {
275 return [&] { return y; }(); // expected-warning {{lookup into dependent bases}}
276 }
277 };
278 template struct Derived<int>;
279 }
280
281 namespace typedef_in_base {
282 template <typename T> struct A { typedef T NameFromBase; };
283 template <typename T> struct B : A<T> {
284 NameFromBase m; // expected-warning {{found via unqualified lookup into dependent bases}}
285 };
286 static_assert(sizeof(B<int>) == 4, "");
287 }
288
289 namespace struct_in_base {
290 template <typename T> struct A { struct NameFromBase {}; };
291 template <typename T> struct B : A<T> {
292 NameFromBase m; // expected-warning {{found via unqualified lookup into dependent bases}}
293 };
294 static_assert(sizeof(B<int>) == 1, "");
295 }
296
297 namespace enum_in_base {
298 template <typename T> struct A { enum NameFromBase { X }; };
299 template <typename T> struct B : A<T> {
300 NameFromBase m; // expected-warning {{found via unqualified lookup into dependent bases}}
301 };
302 static_assert(sizeof(B<int>) == sizeof(A<int>::NameFromBase), "");
303 }
304
305 namespace two_types_in_base {
306 template <typename T> struct A { typedef T NameFromBase; }; // expected-note {{member found by ambiguous name lookup}}
307 template <typename T> struct B { struct NameFromBase { T m; }; }; // expected-note {{member found by ambiguous name lookup}}
308 template <typename T> struct C : A<T>, B<T> {
309 NameFromBase m; // expected-error {{member 'NameFromBase' found in multiple base classes of different types}} expected-warning {{use of identifier 'NameFromBase' found via unqualified lookup into dependent bases of class templates is a Microsoft extension}}
310 };
311 static_assert(sizeof(C<int>) != 0, ""); // expected-note {{in instantiation of template class 'two_types_in_base::C<int>' requested here}}
312 }
313
314 namespace type_and_decl_in_base {
315 template <typename T> struct A { typedef T NameFromBase; };
316 template <typename T> struct B { static const T NameFromBase = 42; };
317 template <typename T> struct C : A<T>, B<T> {
318 NameFromBase m; // expected-error {{unknown type name 'NameFromBase'}}
319 };
320 }
321
322 namespace classify_type_from_base {
323 template <typename T> struct A { struct NameFromBase {}; };
324 template <typename T> struct B : A<T> {
325 A<NameFromBase> m; // expected-warning {{found via unqualified lookup into dependent bases}}
326 };
327 }
328
329 namespace classify_nontype_from_base {
330 // MSVC does not do lookup of non-type declarations from dependent template base
331 // classes. The extra lookup only applies to types.
NameFromBaseclassify_nontype_from_base::A332 template <typename T> struct A { void NameFromBase() {} };
333 template <void (*F)()> struct B { };
334 template <typename T> struct C : A<T> {
335 B<C::NameFromBase> a; // correct
336 B<NameFromBase> b; // expected-error {{use of undeclared identifier 'NameFromBase'}}
337 };
338 }
339
340 namespace template_in_base {
341 template <typename T> struct A {
342 template <typename U> struct NameFromBase { U x; };
343 };
344 template <typename T> struct B : A<T> {
345 // Correct form.
346 typename B::template NameFromBase<T> m;
347 };
348 template <typename T> struct C : A<T> {
349 // Incorrect form.
350 NameFromBase<T> m; // expected-error {{unknown type name 'NameFromBase'}}
351 //expected-error@-1 {{expected member name or ';' after declaration specifiers}}
352 };
353 }
354
355 namespace type_in_inner_class_in_base {
356 template <typename T>
357 struct A {
358 struct B { typedef T NameFromBase; };
359 };
360 template <typename T>
361 struct C : A<T>::B { NameFromBase m; }; // expected-error {{unknown type name 'NameFromBase'}}
362 }
363
364 namespace type_in_inner_template_class_in_base {
365 template <typename T>
366 struct A {
367 template <typename U> struct B { typedef U InnerType; };
368 };
369 template <typename T>
370 struct C : A<T>::template B<T> {
371 NameFromBase m; // expected-error {{unknown type name 'NameFromBase'}}
372 };
373 }
374
375 namespace have_nondependent_base {
376 template <typename T>
377 struct A {
378 // Nothing, lookup should fail.
379 };
380 template <typename T>
381 struct B : A<T> { NameFromBase m; }; // expected-error {{unknown type name 'NameFromBase'}}
382 struct C : A<int> { NameFromBase m; }; // expected-error {{unknown type name 'NameFromBase'}}
383 }
384
385 namespace type_in_base_of_dependent_base {
386 struct A { typedef int NameFromBase; };
387 template <typename T>
388 struct B : A {};
389 template <typename T>
390 struct C : B<T> { NameFromBase m; }; // expected-warning {{use of identifier 'NameFromBase' found via unqualified lookup into dependent bases of class templates is a Microsoft extension}}
391 }
392
393 namespace type_in_second_dependent_base {
394 template <typename T>
395 struct A {};
396 template<typename T>
397 struct B { typedef T NameFromBase; };
398 template <typename T>
399 struct D : A<T>, B<T> { NameFromBase m; }; // expected-warning {{use of identifier 'NameFromBase' found via unqualified lookup into dependent bases of class templates is a Microsoft extension}}
400 }
401
402 namespace type_in_second_non_dependent_base {
403 struct A {};
404 struct B { typedef int NameFromBase; };
405 template<typename T>
406 struct C : A, B {};
407 template <typename T>
408 struct D : C<T> { NameFromBase m; }; // expected-warning {{use of identifier 'NameFromBase' found via unqualified lookup into dependent bases of class templates is a Microsoft extension}}
409 }
410
411 namespace type_in_virtual_base_of_dependent_base {
412 template <typename T>
413 struct A { typedef T NameFromBase; };
414 template <typename T>
415 struct B : virtual A<T> {};
416 template <typename T>
417 struct C : B<T>, virtual A<T> { NameFromBase m; }; // expected-warning {{use of identifier 'NameFromBase' found via unqualified lookup into dependent bases of class templates is a Microsoft extension}}
418 C<int> c;
419 }
420
421 namespace type_in_base_of_multiple_dependent_bases {
422 template <typename T>
423 struct A { typedef T NameFromBase; };
424 template <typename T>
425 struct B : public A<T> {};
426 template <typename T>
427 struct C : B<T>, public A<T> { NameFromBase m; }; // expected-warning {{use of identifier 'NameFromBase' found via unqualified lookup into dependent bases of class templates is a Microsoft extension}} expected-warning {{direct base 'A<int>' is inaccessible due to ambiguity:}}
428 C<int> c; // expected-note {{in instantiation of template class 'type_in_base_of_multiple_dependent_bases::C<int>' requested here}}
429 }
430
431 namespace type_in_dependent_base_of_non_dependent_type {
432 template<typename T> struct A { typedef int NameFromBase; };
433 template<typename T> struct B : A<T> {
434 struct C;
435 template<typename TT>
436 struct D : C {
437 NameFromBase m; // expected-warning {{use of identifier 'NameFromBase' found via unqualified lookup into dependent bases of class templates is a Microsoft extension}}
438 };
439 struct E : C {
440 NameFromBase m; // expected-warning {{use of identifier 'NameFromBase' found via unqualified lookup into dependent bases of class templates is a Microsoft extension}}
441 };
442 };
443 template<typename T> struct B<T>::C : B {
444 NameFromBase m; // expected-warning {{use of identifier 'NameFromBase' found via unqualified lookup into dependent bases of class templates is a Microsoft extension}}
445 };
446 template<typename T> struct F : B<T>::C {
447 NameFromBase m; // expected-error {{unknown type name 'NameFromBase'}}
448 };
449 }
450
451 namespace lookup_in_function_contexts {
452 template <typename T> struct A { typedef T NameFromBase; };
453 template <typename T>
454 struct B : A<T> {
455 // expected-warning@+1 {{lookup into dependent bases}}
lateSpecifiedFunclookup_in_function_contexts::B456 static auto lateSpecifiedFunc() -> decltype(NameFromBase()) {
457 return {};
458 }
459
memberFunclookup_in_function_contexts::B460 static void memberFunc() {
461 NameFromBase x; // expected-warning {{lookup into dependent bases}}
462 }
463
funcLocalClasslookup_in_function_contexts::B464 static void funcLocalClass() {
465 struct X {
466 NameFromBase x; // expected-warning {{lookup into dependent bases}}
467 } y;
468 }
469
localClassMethodlookup_in_function_contexts::B470 void localClassMethod() {
471 struct X {
472 void bar() {
473 NameFromBase m; // expected-warning {{lookup into dependent bases}}
474 }
475 } x;
476 x.bar();
477 }
478
funcLambdalookup_in_function_contexts::B479 static void funcLambda() {
480 auto l = []() {
481 NameFromBase x; // expected-warning {{lookup into dependent bases}}
482 };
483 l();
484 }
485
constexprFunclookup_in_function_contexts::B486 static constexpr int constexprFunc() {
487 NameFromBase x = {}; // expected-warning {{lookup into dependent bases}}
488 return sizeof(x);
489 }
490
autoFunclookup_in_function_contexts::B491 static auto autoFunc() {
492 NameFromBase x; // expected-warning {{lookup into dependent bases}}
493 return x;
494 }
495 };
496
497 // Force us to parse the methods.
498 template struct B<int>;
499 }
500
501 namespace function_template_deduction {
502 // Overloaded function templates.
f()503 template <int N> int f() { return N; }
f()504 template <typename T> int f() { return sizeof(T); }
505
506 // Dependent base class with type.
507 template <typename T>
508 struct A { typedef T NameFromBase; };
509 template <typename T>
510 struct B : A<T> {
511 // expected-warning@+1 {{found via unqualified lookup into dependent bases}}
512 int x = f<NameFromBase>();
513 };
514
515 // Dependent base class with enum.
516 template <typename T> struct C { enum { NameFromBase = 4 }; };
517 template <typename T> struct D : C<T> {
518 // expected-warning@+1 {{use of undeclared identifier 'NameFromBase'; unqualified lookup into dependent bases}}
519 int x = f<NameFromBase>();
520 };
521 }
522
523 namespace function_template_undef_impl {
524 template<class T>
f()525 void f() {
526 Undef::staticMethod(); // expected-error {{use of undeclared identifier 'Undef'}}
527 UndefVar.method(); // expected-error {{use of undeclared identifier 'UndefVar'}}
528 }
529 }
530
531 namespace PR20716 {
532 template <template <typename T> class A>
533 struct B : A<int>
534 {
535 XXX x; // expected-error {{unknown type name}}
536 };
537
538 template <typename T>
539 struct C {};
540
541 template <typename T>
542 using D = C<T>;
543
544 template <typename T>
545 struct E : D<T>
546 {
547 XXX x; // expected-error {{unknown type name}}
548 };
549 }
550
551 namespace PR23810 {
552 void f(int);
553 struct Base {
554 void f(); // expected-note{{must qualify identifier to find this declaration in dependent base class}}
555 };
556 template <typename T> struct Template : T {
memberPR23810::Template557 void member() {
558 f(); // expected-warning {{found via unqualified lookup into dependent bases}}
559 }
560 };
test()561 void test() {
562 Template<Base> x;
563 x.member(); // expected-note{{requested here}}
564 };
565 }
566
567 namespace PR23823 {
568 // Don't delay lookup in SFINAE context.
569 template <typename T> decltype(g(T())) check(); // expected-note{{candidate template ignored: substitution failure [with T = int]: use of undeclared identifier 'g'}}
570 decltype(check<int>()) x; // expected-error{{no matching function for call to 'check'}}
571
572 void h();
573 template <typename T> decltype(h(T())) check2(); // expected-note{{candidate template ignored: substitution failure [with T = int]: no matching function for call to 'h'}}
574 decltype(check2<int>()) y; // expected-error{{no matching function for call to 'check2'}}
575 }
576
577 // We also allow unqualified lookup into bases in contexts where the we know the
578 // undeclared identifier *must* be a type, such as a new expression or catch
579 // parameter type.
580 template <typename T>
581 struct UseUnqualifiedTypeNames : T {
fooUseUnqualifiedTypeNames582 void foo() {
583 void *P = new TheType; // expected-warning {{unqualified lookup}} expected-error {{no type}}
584 size_t x = __builtin_offsetof(TheType, f2); // expected-warning {{unqualified lookup}} expected-error {{no type}}
585 try {
586 } catch (TheType) { // expected-warning {{unqualified lookup}} expected-error {{no type}}
587 }
588 enum E : IntegerType { E0 = 42 }; // expected-warning {{unqualified lookup}} expected-error {{no type}}
589 _Atomic(TheType) a; // expected-warning {{unqualified lookup}} expected-error {{no type}}
590 }
591 void out_of_line();
592 };
593 template <typename T>
out_of_line()594 void UseUnqualifiedTypeNames<T>::out_of_line() {
595 void *p = new TheType; // expected-warning {{unqualified lookup}} expected-error {{no type}}
596 }
597 struct Base {
598 typedef int IntegerType;
599 struct TheType {
600 int f1, f2;
601 };
602 };
603 template struct UseUnqualifiedTypeNames<Base>;
604 struct BadBase { };
605 template struct UseUnqualifiedTypeNames<BadBase>; // expected-note-re 2 {{in instantiation {{.*}} requested here}}
606
607 namespace partial_template_lookup {
608
609 class Bar;
610 class Spare;
611
612 template <class T, class X = Bar>
613 class FooTemplated;
614
615 class FooBase {
616 public:
617 typedef int BaseTypedef;
618 };
619
620 // Partial template spec (unused)
621 template <class T>
622 class FooTemplated<T, Spare> {};
623
624 // Partial template spec (used)
625 template <class T>
626 class FooTemplated<T, Bar> : public FooBase {};
627
628 // Full template spec
629 template <class T, class X>
630 class FooTemplated : public FooTemplated<T, Bar> {
631 public:
632 BaseTypedef Member; // expected-warning {{unqualified lookup}}
633 };
634 }
635