1// RUN: %clang_cc1 -fsyntax-only -verify %s
2struct A {};
3struct B : public A {};             // Single public base.
4struct C1 : public virtual B {};    // Single virtual base.
5struct C2 : public virtual B {};
6struct D : public C1, public C2 {}; // Diamond
7struct E : private A {};            // Single private base. expected-note 3 {{declared private here}}
8struct F : public C1 {};            // Single path to B with virtual.
9struct G1 : public B {};
10struct G2 : public B {};
11struct H : public G1, public G2 {}; // Ambiguous path to B.
12struct I;                           // Incomplete.
13struct J;                           // Incomplete.
14
15enum Enum { En1, En2 };
16enum Onom { On1, On2 };
17
18struct Co1 { operator int(); };
19struct Co2 { Co2(int); };
20struct Co3 { };
21struct Co4 { Co4(Co3); operator Co3(); };
22
23// Explicit implicits
24void t_529_2()
25{
26  int i = 1;
27  (void)static_cast<float>(i);
28  double d = 1.0;
29  (void)static_cast<float>(d);
30  (void)static_cast<int>(d);
31  (void)static_cast<char>(i);
32  (void)static_cast<unsigned long>(i);
33  (void)static_cast<int>(En1);
34  (void)static_cast<double>(En1);
35  (void)static_cast<int&>(i);
36  (void)static_cast<const int&>(i);
37
38  int ar[1];
39  (void)static_cast<const int*>(ar);
40  (void)static_cast<void (*)()>(t_529_2);
41
42  (void)static_cast<void*>(0);
43  (void)static_cast<void*>((int*)0);
44  (void)static_cast<volatile const void*>((const int*)0);
45  (void)static_cast<A*>((B*)0);
46  (void)static_cast<A&>(*((B*)0));
47  (void)static_cast<const B*>((C1*)0);
48  (void)static_cast<B&>(*((C1*)0));
49  (void)static_cast<A*>((D*)0);
50  (void)static_cast<const A&>(*((D*)0));
51  (void)static_cast<int B::*>((int A::*)0);
52  (void)static_cast<void (B::*)()>((void (A::*)())0);
53
54  (void)static_cast<int>(Co1());
55  (void)static_cast<Co2>(1);
56  (void)static_cast<Co3>(static_cast<Co4>(Co3()));
57
58  // Bad code below
59
60  (void)static_cast<void*>((const int*)0); // expected-error {{static_cast from 'const int *' to 'void *' is not allowed}}
61  (void)static_cast<A*>((E*)0); // expected-error {{cannot cast 'E' to its private base class 'A'}}
62  (void)static_cast<A*>((H*)0); // expected-error {{ambiguous conversion}}
63  (void)static_cast<int>((int*)0); // expected-error {{static_cast from 'int *' to 'int' is not allowed}}
64  (void)static_cast<A**>((B**)0); // expected-error {{static_cast from 'B **' to 'A **' is not allowed}}
65  (void)static_cast<char&>(i); // expected-error {{non-const lvalue reference to type 'char' cannot bind to a value of unrelated type 'int'}}
66}
67
68// Anything to void
69void t_529_4()
70{
71  static_cast<void>(1);
72  static_cast<void>(t_529_4);
73}
74
75// Static downcasts
76void t_529_5_8()
77{
78  (void)static_cast<B*>((A*)0);
79  (void)static_cast<B&>(*((A*)0));
80  (void)static_cast<const G1*>((A*)0);
81  (void)static_cast<const G1&>(*((A*)0));
82
83  // Bad code below
84
85  (void)static_cast<C1*>((A*)0); // expected-error {{cannot cast 'A *' to 'C1 *' via virtual base 'B'}}
86  (void)static_cast<C1&>(*((A*)0)); // expected-error {{cannot cast 'A' to 'C1 &' via virtual base 'B'}}
87  (void)static_cast<D*>((A*)0); // expected-error {{cannot cast 'A *' to 'D *' via virtual base 'B'}}
88  (void)static_cast<D&>(*((A*)0)); // expected-error {{cannot cast 'A' to 'D &' via virtual base 'B'}}
89  (void)static_cast<B*>((const A*)0); // expected-error {{static_cast from 'const A *' to 'B *' casts away qualifiers}}
90  (void)static_cast<B&>(*((const A*)0)); // expected-error {{static_cast from 'const A' to 'B &' casts away qualifiers}}
91  (void)static_cast<E*>((A*)0); // expected-error {{cannot cast private base class 'A' to 'E'}}
92  (void)static_cast<E&>(*((A*)0)); // expected-error {{cannot cast private base class 'A' to 'E'}}
93  (void)static_cast<H*>((A*)0); // expected-error {{ambiguous cast from base 'A' to derived 'H':\n    struct A -> struct B -> struct G1 -> struct H\n    struct A -> struct B -> struct G2 -> struct H}}
94  (void)static_cast<H&>(*((A*)0)); // expected-error {{ambiguous cast from base 'A' to derived 'H':\n    struct A -> struct B -> struct G1 -> struct H\n    struct A -> struct B -> struct G2 -> struct H}}
95  (void)static_cast<E*>((B*)0); // expected-error {{static_cast from 'B *' to 'E *' is not allowed}}
96  (void)static_cast<E&>(*((B*)0)); // expected-error {{non-const lvalue reference to type 'E' cannot bind to a value of unrelated type 'B'}}
97
98  // TODO: Test inaccessible base in context where it's accessible, i.e.
99  // member function and friend.
100
101  // TODO: Test DR427. This requires user-defined conversions, though.
102}
103
104// Enum conversions
105void t_529_7()
106{
107  (void)static_cast<Enum>(1);
108  (void)static_cast<Enum>(1.0);
109  (void)static_cast<Onom>(En1);
110
111  // Bad code below
112
113  (void)static_cast<Enum>((int*)0); // expected-error {{static_cast from 'int *' to 'Enum' is not allowed}}
114}
115
116// Void pointer to object pointer
117void t_529_10()
118{
119  (void)static_cast<int*>((void*)0);
120  (void)static_cast<const A*>((void*)0);
121
122  // Bad code below
123
124  (void)static_cast<int*>((const void*)0); // expected-error {{static_cast from 'const void *' to 'int *' casts away qualifiers}}
125  (void)static_cast<void (*)()>((void*)0); // expected-error {{static_cast from 'void *' to 'void (*)()' is not allowed}}
126}
127
128// Member pointer upcast.
129void t_529_9()
130{
131  (void)static_cast<int A::*>((int B::*)0);
132
133  // Bad code below
134  (void)static_cast<int A::*>((int H::*)0); // expected-error {{ambiguous conversion from pointer to member of derived class 'H' to pointer to member of base class 'A':}}
135  (void)static_cast<int A::*>((int F::*)0); // expected-error {{conversion from pointer to member of class 'F' to pointer to member of class 'A' via virtual base 'B' is not allowed}}
136  (void)static_cast<int I::*>((int J::*)0); // expected-error {{static_cast from 'int J::*' to 'int I::*' is not allowed}}
137}
138
139// PR 5261 - static_cast should instantiate template if possible
140namespace pr5261 {
141  struct base {};
142  template<typename E> struct derived : public base {};
143  template<typename E> struct outer {
144    base *pb;
145    ~outer() { (void)static_cast<derived<E>*>(pb); }
146  };
147  outer<int> EntryList;
148}
149
150
151// Initialization by constructor
152struct X0;
153
154struct X1 {
155  X1();
156  X1(X1&);
157  X1(const X0&);
158
159  operator X0() const;
160};
161
162struct X0 { };
163
164void test_ctor_init() {
165  (void)static_cast<X1>(X1());
166}
167
168// Casting away constness
169struct X2 {
170};
171
172struct X3 : X2 {
173};
174
175struct X4 {
176  typedef const X3 X3_typedef;
177
178  void f() const {
179    (void)static_cast<X3_typedef*>(x2);
180  }
181
182  const X2 *x2;
183};
184
185// PR5897 - accept static_cast from const void* to const int (*)[1].
186void PR5897() { (void)static_cast<const int(*)[1]>((const void*)0); }
187
188namespace PR6072 {
189  struct A { };
190  struct B : A { void f(int); void f(); };  // expected-note 2{{candidate function}}
191  struct C : B { };
192  struct D { };
193
194  void f() {
195    (void)static_cast<void (A::*)()>(&B::f);
196    (void)static_cast<void (B::*)()>(&B::f);
197    (void)static_cast<void (C::*)()>(&B::f);
198    (void)static_cast<void (D::*)()>(&B::f); // expected-error-re{{address of overloaded function 'f' cannot be static_cast to type 'void (PR6072::D::*)(){{( __attribute__\(\(thiscall\)\))?}}'}}
199  }
200}
201