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