1 // RUN: %clang_cc1 -std=c++98 -verify -fsyntax-only %s -Wno-c++11-extensions -Wno-c++1y-extensions -DPRECXX11
2 // RUN: %clang_cc1 -std=c++11 -verify -fsyntax-only -Wno-c++1y-extensions %s
3 // RUN: %clang_cc1 -std=c++1y -verify -fsyntax-only %s -DCPP1Y
4
5 #define CONST const
6
7 #ifdef PRECXX11
8 #define static_assert(expr, msg) typedef int static_assert[(expr) ? 1 : -1];
9 #endif
10
11 class A {
12 template<typename T> CONST T wrong; // expected-error {{member 'wrong' declared as a template}}
13 template<typename T> CONST T wrong_init = 5; // expected-error {{member 'wrong_init' declared as a template}}
14 template<typename T, typename T0> static CONST T right = T(100);
15 template<typename T> static CONST T right<T,int> = 5;
16 template<typename T> CONST int right<int,T>; // expected-error {{member 'right' declared as a template}}
17 template<typename T> CONST float right<float,T> = 5; // expected-error {{member 'right' declared as a template}}
18 template<> static CONST int right<int,int> = 7;
19 template<> static CONST float right<float,int>;
20 template static CONST int right<int,int>; // expected-error {{expected '<' after 'template'}}
21 };
22
23 namespace out_of_line {
24 class B0 {
25 template<typename T, typename T0> static CONST T right = T(100);
26 template<typename T> static CONST T right<T,int> = T(5);
27 };
28 template<> CONST int B0::right<int,int> = 7; // expected-note {{previous}}
29 template CONST int B0::right<int,int>; // expected-warning {{has no effect}}
30 template<> CONST int B0::right<int,float>; // expected-note {{previous}}
31 template CONST int B0::right<int,float>; // expected-warning {{has no effect}}
32
33 class B1 {
34 template<typename T, typename T0> static CONST T right;
35 template<typename T> static CONST T right<T,int>;
36 };
37 template<typename T, typename T0> CONST T B1::right = T(100);
38 template<typename T> CONST T B1::right<T,int> = T(5);
39
40 class B2 {
41 template<typename T, typename T0> static CONST T right = T(100); // expected-note {{previous initialization is here}}
42 template<typename T> static CONST T right<T,int> = T(5); // expected-note {{previous initialization is here}}
43 };
44 template<typename T, typename T0> CONST T B2::right = T(100); // expected-error {{static data member 'right' already has an initializer}}
45 template<typename T> CONST T B2::right<T,int> = T(5); // expected-error {{static data member 'right' already has an initializer}}
46
47 class B3 {
48 template<typename T, typename T0> static CONST T right = T(100);
49 template<typename T> static CONST T right<T,int> = T(5);
50 };
51 template<typename T, typename T0> CONST T B3::right;
52 template<typename T> CONST T B3::right<T,int>;
53
54 class B4 {
55 template<typename T, typename T0> static CONST T a;
56 template<typename T> static CONST T a<T,int> = T(100);
57 template<typename T, typename T0> static CONST T b = T(100);
58 template<typename T> static CONST T b<T,int>;
59 };
60 template<typename T, typename T0> CONST T B4::a; // expected-error {{default initialization of an object of const type 'const int'}}
61 template<typename T> CONST T B4::a<T,int>;
62 template CONST int B4::a<int,char>; // expected-note {{in instantiation of}}
63 template CONST int B4::a<int,int>;
64
65 template<typename T, typename T0> CONST T B4::b;
66 template<typename T> CONST T B4::b<T,int>; // expected-error {{default initialization of an object of const type 'const int'}}
67 template CONST int B4::b<int,char>;
68 template CONST int B4::b<int,int>; // expected-note {{in instantiation of}}
69 }
70
71 namespace non_const_init {
72 class A {
73 template<typename T> static T wrong_inst_undefined = T(10); // expected-note {{refers here}}
74 template<typename T> static T wrong_inst_defined = T(10); // expected-error {{non-const static data member must be initialized out of line}}
75 template<typename T> static T wrong_inst_out_of_line;
76 };
77
78 template const int A::wrong_inst_undefined<const int>; // expected-error {{undefined}}
79
80 template<typename T> T A::wrong_inst_defined;
81 template const int A::wrong_inst_defined<const int>;
82 template int A::wrong_inst_defined<int>; // expected-note {{in instantiation of static data member 'non_const_init::A::wrong_inst_defined<int>' requested here}}
83
84 template<typename T> T A::wrong_inst_out_of_line = T(10);
85 template int A::wrong_inst_out_of_line<int>;
86
87 class B {
88 template<typename T> static T wrong_inst; // expected-note {{refers here}}
89 template<typename T> static T wrong_inst<T*> = T(100); // expected-error {{non-const static data member must be initialized out of line}} expected-note {{refers here}}
90
91 template<typename T> static T wrong_inst_fixed;
92 template<typename T> static T wrong_inst_fixed<T*>;
93 };
94 template int B::wrong_inst<int>; // expected-error {{undefined}}
95 // FIXME: It'd be better to produce the 'explicit instantiation of undefined
96 // template' diagnostic here, not the 'must be initialized out of line'
97 // diagnostic.
98 template int B::wrong_inst<int*>; // expected-note {{in instantiation of static data member 'non_const_init::B::wrong_inst<int *>' requested here}}
99 template const int B::wrong_inst<const int*>; // expected-error {{undefined}}
100 template<typename T> T B::wrong_inst_fixed = T(100);
101 template int B::wrong_inst_fixed<int>;
102
103 class C {
104 template<typename T> static CONST T right_inst = T(10); // expected-note {{here}}
105 template<typename T> static CONST T right_inst<T*> = T(100); // expected-note {{here}}
106 };
107 template CONST int C::right_inst<int>; // expected-error {{undefined variable template}}
108 template CONST int C::right_inst<int*>; // expected-error {{undefined variable template}}
109
110 namespace pointers {
111
112 struct C0 {
113 template<typename U> static U Data;
114 template<typename U> static CONST U Data<U*> = U(); // expected-note {{here}}
115
116 template<typename U> static U Data2;
117 template<typename U> static CONST U Data2<U*> = U();
118 };
119 const int c0_test = C0::Data<int*>;
120 static_assert(c0_test == 0, "");
121 template const int C0::Data<int*>; // expected-error {{undefined}}
122
123 template<typename U> const U C0::Data2<U*>;
124 template const int C0::Data2<int*>;
125
126 struct C1a {
127 template<typename U> static U Data;
128 template<typename U> static U* Data<U*>; // Okay, with out-of-line definition
129 };
130 template<typename T> T* C1a::Data<T*> = new T();
131 template int* C1a::Data<int*>;
132
133 struct C1b {
134 template<typename U> static U Data;
135 template<typename U> static CONST U* Data<U*>; // Okay, with out-of-line definition
136 };
137 template<typename T> CONST T* C1b::Data<T*> = (T*)(0);
138 template CONST int* C1b::Data<int*>;
139
140 struct C2a {
141 template<typename U> static int Data;
142 template<typename U> static U* Data<U*> = new U(); // expected-error {{non-const static data member must be initialized out of line}}
143 };
144 template int* C2a::Data<int*>; // expected-note {{in instantiation of static data member 'non_const_init::pointers::C2a::Data<int *>' requested here}}
145
146 struct C2b {
147 template<typename U> static int Data;
148 template<typename U> static U *const Data<U*> = (U*)(0); // expected-error {{static data member of type 'int *const'}}
149 };
150 template<typename U> U *const C2b::Data<U*>;
151 template int *const C2b::Data<int*>; // expected-note {{in instantiation of static data member 'non_const_init::pointers::C2b::Data<int *>' requested here}}
152 }
153 }
154
155 #ifndef PRECXX11
156 namespace constexpred {
157 class A {
158 template<typename T> constexpr T wrong; // expected-error {{member 'wrong' declared as a template}} \
159 // expected-error {{non-static data member cannot be constexpr; did you intend to make it const?}}
160 template<typename T> constexpr T wrong_init = 5; // expected-error {{non-static data member cannot be constexpr; did you intend to make it static?}}
161 template<typename T, typename T0> static constexpr T right = T(100);
162 template<typename T> static constexpr T right<T,int> = 5;
163 template<typename T> constexpr int right<int,T>; // expected-error {{member 'right' declared as a template}} \
164 // expected-error {{non-static data member cannot be constexpr; did you intend to make it const?}}
165 template<typename T> constexpr float right<float,T> = 5; // expected-error {{non-static data member cannot be constexpr; did you intend to make it static?}}
166 template<> static constexpr int right<int,int> = 7;
167 template<> static constexpr float right<float,int>; // expected-error {{requires an initializer}}
168 template static constexpr int right<int,int>; // expected-error {{expected '<' after 'template'}}
169 };
170 }
171 #endif
172
173 namespace in_class_template {
174
175 template<typename T>
176 class D0 {
177 template<typename U> static U Data; // expected-note {{here}}
178 template<typename U> static CONST U Data<U*> = U();
179 };
180 template CONST int D0<float>::Data<int*>;
181 template int D0<float>::Data<int>; // expected-error {{undefined}}
182 template<typename T> template<typename U> const U D0<T>::Data<U*>;
183
184 template<typename T>
185 class D1 {
186 template<typename U> static U Data;
187 template<typename U> static U* Data<U*>;
188 };
189 template<typename T>
190 template<typename U> U* D1<T>::Data<U*> = (U*)(0);
191 template int* D1<float>::Data<int*>; // expected-note {{previous}}
192 template int* D1<float>::Data<int*>; // expected-error {{duplicate explicit instantiation}}
193
194 template<typename T>
195 class D2 {
196 template<typename U> static U Data;
197 template<typename U> static U* Data<U*>;
198 };
199 template<>
200 template<typename U> U* D2<float>::Data<U*> = (U*)(0) + 1;
201 template int* D2<float>::Data<int*>; // expected-note {{previous}}
202 template int* D2<float>::Data<int*>; // expected-error {{duplicate explicit instantiation}}
203
204 template<typename T>
205 struct D3 {
206 template<typename U> static CONST U Data = U(100); // expected-note {{here}}
207 };
208 static_assert(D3<float>::Data<int> == 100, "");
209 template const char D3<float>::Data<char>; // expected-error {{undefined}}
210
211 namespace bug_files {
212 template<typename T>
213 class D0a {
214 template<typename U> static U Data;
215 template<typename U> static CONST U Data<U*> = U(10); // expected-note {{previous declaration is here}}
216 };
217 template<>
218 template<typename U> U D0a<float>::Data<U*> = U(100); // expected-error {{redefinition of 'Data'}}
219
220 // FIXME: We should accept this, and the corresponding case for class
221 // templates.
222 //
223 // [temp.class.spec.mfunc]/2: If the primary member template is explicitly
224 // specialized for a given specialization of the enclosing class template,
225 // the partial specializations of the member template are ignored
226 template<typename T>
227 class D1 {
228 template<typename U> static U Data;
229 template<typename U> static CONST U Data<U*> = U(10); // expected-note {{previous declaration is here}}
230 };
231 template<>
232 template<typename U> U D1<float>::Data = U(10);
233 template<>
234 template<typename U> U D1<float>::Data<U*> = U(100); // expected-error{{redefinition of 'Data'}}
235 }
236
237 namespace definition_after_outer_instantiation {
238 template<typename A> struct S {
239 template<typename B> static const int V1;
240 template<typename B> static const int V2;
241 };
242 template struct S<int>;
243 template<typename A> template<typename B> const int S<A>::V1 = 123;
244 template<typename A> template<typename B> const int S<A>::V2<B*> = 456;
245
246 static_assert(S<int>::V1<int> == 123, "");
247
248 // FIXME: The first and third case below possibly should be accepted. We're
249 // not picking up partial specializations added after the primary template
250 // is instantiated. This is kind of implied by [temp.class.spec.mfunc]/2,
251 // and matches our behavior for member class templates, but it's not clear
252 // that this is intentional. See PR17294 and core-24030.
253 static_assert(S<int>::V2<int*> == 456, ""); // FIXME expected-error {{}}
254 static_assert(S<int>::V2<int&> == 789, ""); // expected-error {{}}
255
256 template<typename A> template<typename B> const int S<A>::V2<B&> = 789;
257 static_assert(S<int>::V2<int&> == 789, ""); // FIXME expected-error {{}}
258
259 // All is OK if the partial specialization is declared before the implicit
260 // instantiation of the class template specialization.
261 static_assert(S<char>::V1<int> == 123, "");
262 static_assert(S<char>::V2<int*> == 456, "");
263 static_assert(S<char>::V2<int&> == 789, "");
264 }
265
266 namespace incomplete_array {
267 template<typename T> extern T var[];
268 template<typename T> T var[] = { 1, 2, 3 };
269 template<> char var<char>[] = "hello";
270 template<typename T> char var<T*>[] = "pointer";
271
272 static_assert(sizeof(var<int>) == 12, "");
273 static_assert(sizeof(var<char>) == 6, "");
274 static_assert(sizeof(var<void*>) == 8, "");
275
276 template<typename...> struct tuple;
277
278 template<typename T> struct A {
279 template<typename U> static T x[];
280 template<typename U> static T y[];
281
282 template<typename...U> static T y<tuple<U...> >[];
283 };
284
285 int *use_before_definition = A<int>::x<char>;
286 template<typename T> template<typename U> T A<T>::x[sizeof(U)];
287 static_assert(sizeof(A<int>::x<char>) == 4, "");
288
289 template<typename T> template<typename...U> T A<T>::y<tuple<U...> >[] = { U()... };
290 static_assert(sizeof(A<int>::y<tuple<char, char, char> >) == 12, "");
291 }
292
293 namespace bad_reference {
294 struct S {
295 template<typename T> static int A; // expected-note 4{{here}}
296 };
297
f()298 template<typename T> void f() {
299 typename T::template A<int> a; // expected-error {{template name refers to non-type template 'S::template A'}}
300 }
g()301 template<typename T> void g() {
302 T::template A<int>::B = 0; // expected-error {{template name refers to non-type template 'S::template A'}}
303 }
h()304 template<typename T> void h() {
305 class T::template A<int> c; // expected-error {{template name refers to non-type template 'S::template A'}}
306 }
307
308 template<typename T>
309 struct X : T::template A<int> {}; // expected-error {{template name refers to non-type template 'S::template A'}}
310
311 template void f<S>(); // expected-note {{in instantiation of}}
312 template void g<S>(); // expected-note {{in instantiation of}}
313 template void h<S>(); // expected-note {{in instantiation of}}
314 template struct X<S>; // expected-note {{in instantiation of}}
315 }
316 }
317
318 namespace in_nested_classes {
319 // TODO:
320 }
321
322 namespace bitfield {
323 struct S {
324 template <int I>
325 static int f : I; // expected-error {{static member 'f' cannot be a bit-field}}
326 };
327 }
328
329 namespace b20896909 {
330 // This used to crash.
331 template<typename T> struct helper {};
332 template<typename T> class A {
333 template <typename> static helper<typename T::error> x; // expected-error {{type 'int' cannot be used prior to '::' because it has no members}}
334 };
test()335 void test() {
336 A<int> ai; // expected-note {{in instantiation of}}
337 }
338 }
339 namespace member_access_is_ok {
340 #ifdef CPP1Y
341 namespace ns1 {
342 struct A {
343 template<class T, T N> constexpr static T Var = N;
344 };
345 static_assert(A{}.Var<int,5> == 5,"");
346 } // end ns1
347 #endif // CPP1Y
348
349 namespace ns2 {
350 template<class T> struct A {
351 template<class U, T N, U M> static T&& Var;
352 };
353 template<class T> template<class U, T N, U M> T&& A<T>::Var = T(N + M);
354 int *AV = &A<int>().Var<char, 5, 'A'>;
355
356 } //end ns2
357 } // end ns member_access_is_ok
358
359 #ifdef CPP1Y
360 namespace PR24473 {
361 struct Value
362 {
363 template<class T>
364 static constexpr T value = 0;
365 };
366
367 template<typename TValue>
368 struct Something
369 {
fooPR24473::Something370 void foo() {
371 static_assert(TValue::template value<int> == 0, ""); // error
372 }
373 };
374
main()375 int main() {
376 Something<Value>{}.foo();
377 return 0;
378 }
379
380 } // end ns PR24473
381 #endif // CPP1Y
382
383 namespace dependent_static_var_template {
384 struct A {
385 template<int = 0> static int n; // expected-note 2{{here}}
386 };
387 int &r = A::template n; // expected-error {{use of variable template 'n' requires template arguments}}
388
389 template<typename T>
f()390 int &f() { return T::template n; } // expected-error {{use of variable template 'n' requires template arguments}}
391 int &s = f<A>(); // expected-note {{instantiation of}}
392
393 namespace B {
394 template<int = 0> static int n; // expected-note {{here}}
395 }
396 int &t = B::template n; // expected-error {{use of variable template 'n' requires template arguments}}
397 }
398