1 // RUN: %clang_cc1 -fcxx-exceptions -fexceptions -fsyntax-only -verify %s
2 template<typename T, typename U>
3 struct X0 {
fX04   void f(T x, U y) {
5     (void)(x + y); // expected-error{{invalid operands}}
6   }
7 };
8 
9 struct X1 { };
10 
11 template struct X0<int, float>;
12 template struct X0<int*, int>;
13 template struct X0<int X1::*, int>; // expected-note{{instantiation of}}
14 
15 template<typename T>
16 struct X2 {
17   void f(T);
18 
gX219   T g(T x, T y) {
20     /* DeclStmt */;
21     T *xp = &x, &yr = y; // expected-error{{pointer to a reference}}
22     /* NullStmt */;
23   }
24 };
25 
26 template struct X2<int>;
27 template struct X2<int&>; // expected-note{{instantiation of}}
28 
29 template<typename T>
30 struct X3 {
fX331   void f(T) {
32     Label:
33     T x;
34     goto Label;
35   }
36 };
37 
38 template struct X3<int>;
39 
40 template <typename T> struct X4 {
fX441   T f() const {
42     return; // expected-error{{non-void function 'f' should return a value}}
43   }
44 
gX445   T g() const {
46     return 1; // expected-error{{void function 'g' should not return a value}}
47   }
48 };
49 
50 template struct X4<void>; // expected-note{{in instantiation of}}
51 template struct X4<int>; // expected-note{{in instantiation of}}
52 
53 struct Incomplete; // expected-note 2{{forward declaration}}
54 
55 template<typename T> struct X5 {
fX556   T f() { } // expected-error{{incomplete result type}}
57 };
58 void test_X5(X5<Incomplete> x5); // okay!
59 
60 template struct X5<Incomplete>; // expected-note{{instantiation}}
61 
62 template<typename T, typename U, typename V> struct X6 {
fX663   U f(T t, U u, V v) {
64     // IfStmt
65     if (t > 0)
66       return u;
67     else {
68       if (t < 0)
69         return v; // expected-error{{cannot initialize return object of type}}
70     }
71 
72     if (T x = t) {
73       t = x;
74     }
75     return v; // expected-error{{cannot initialize return object of type}}
76   }
77 };
78 
79 struct ConvertibleToInt {
80   operator int() const;
81 };
82 
83 template struct X6<ConvertibleToInt, float, char>;
84 template struct X6<bool, int, int*>; // expected-note{{instantiation}}
85 
86 template <typename T> struct X7 {
fX787   void f() {
88     void *v = this;
89   }
90 };
91 
92 template struct X7<int>;
93 
94 template<typename T> struct While0 {
fWhile095   void f(T t) {
96     while (t) {
97     }
98 
99     while (T t2 = T()) ;
100   }
101 };
102 
103 template struct While0<float>;
104 
105 template<typename T> struct Do0 {
fDo0106   void f(T t) {
107     do {
108     } while (t); // expected-error{{not contextually}}
109   }
110 };
111 
112 struct NotConvertibleToBool { };
113 template struct Do0<ConvertibleToInt>;
114 template struct Do0<NotConvertibleToBool>; // expected-note{{instantiation}}
115 
116 template<typename T> struct For0 {
fFor0117   void f(T f, T l) {
118     for (; f != l; ++f) {
119       if (*f)
120         continue;
121       else if (*f == 17)
122         break;
123     }
124   }
125 };
126 
127 template struct For0<int*>;
128 
129 template<typename T> struct Member0 {
fMember0130   void f(T t) {
131     t;
132     t.f;
133     t->f;
134 
135     T* tp;
136     tp.f; // expected-error{{member reference base type 'T *' is not a structure or union}}
137     tp->f;
138 
139     this->f;
140     this.f; // expected-error{{member reference base type 'Member0<T> *' is not a structure or union}}
141   }
142 };
143 
144 template<typename T, typename U> struct Switch0 {
fSwitch0145   U f(T value, U v0, U v1, U v2) {
146     switch (value) {
147     case 0: return v0;
148 
149     case 1: return v1;
150 
151     case 2: // fall through
152 
153     default:
154       return  v2;
155     }
156   }
157 };
158 
159 template struct Switch0<int, float>;
160 
161 template<typename T, int I1, int I2> struct Switch1 {
fSwitch1162   T f(T x, T y, T z) {
163     switch (x) {
164     case I1: return y; // expected-note{{previous}}
165     case I2: return z; // expected-error{{duplicate}}
166     default: return x;
167     }
168   }
169 };
170 
171 template struct Switch1<int, 1, 2>;
172 template struct Switch1<int, 2, 2>; // expected-note{{instantiation}}
173 
174 template<typename T> struct IndirectGoto0 {
fIndirectGoto0175   void f(T x) {
176     // FIXME: crummy error message below
177     goto *x; // expected-error{{incompatible}}
178 
179   prior:
180     T prior_label;
181     prior_label = &&prior; // expected-error{{assigning to 'int'}}
182 
183     T later_label;
184     later_label = &&later; // expected-error{{assigning to 'int'}}
185 
186   later:
187     (void)(1+1);
188   }
189 };
190 
191 template struct IndirectGoto0<void*>;
192 template struct IndirectGoto0<int>; // expected-note{{instantiation}}
193 
194 template<typename T> struct TryCatch0 {
fTryCatch0195   void f() {
196     try {
197     } catch (T t) { // expected-error{{incomplete type}} \
198                     // expected-error{{abstract class}}
199     } catch (...) {
200     }
201   }
202 };
203 
204 struct Abstract {
205   virtual void foo() = 0; // expected-note{{pure virtual}}
206 };
207 
208 template struct TryCatch0<int>; // okay
209 template struct TryCatch0<Incomplete*>; // expected-note{{instantiation}}
210 template struct TryCatch0<Abstract>; // expected-note{{instantiation}}
211 
212 // PR4383
213 template<typename T> struct X;
214 template<typename T> struct Y : public X<T> {
xY215   Y& x() { return *this; }
216 };
217 
218 // Make sure our assertions don't get too uppity.
219 namespace test0 {
220   template <class T> class A { void foo(T array[10]); };
221   template class A<int>;
222 }
223 
224 namespace PR7016 {
f()225   template<typename T> void f() { T x = x; }
226   template void f<int>();
227 }
228 
229 namespace PR9880 {
230   struct lua_State;
231   struct no_tag { char a; };			// (A)
232   struct yes_tag { long a; long b; };	// (A)
233 
234   template <typename T>
235   struct HasIndexMetamethod {
236     template <typename U>
237     static no_tag check(...);
238     template <typename U>
239     static yes_tag check(char[sizeof(&U::luaIndex)]);
240     enum { value = sizeof(check<T>(0)) == sizeof(yes_tag) };
241   };
242 
243   class SomeClass {
244   public:
245     int luaIndex(lua_State* L);
246   };
247 
248   int i = HasIndexMetamethod<SomeClass>::value;
249 }
250