1 // RUN: %clang_cc1 -fsyntax-only -verify %s
2 struct A {};
3 struct B : public A {}; // Single public base.
4 struct C1 : public virtual B {}; // Single virtual base.
5 struct C2 : public virtual B {};
6 struct D : public C1, public C2 {}; // Diamond
7 struct E : private A {}; // Single private base. expected-note 3 {{declared private here}}
8 struct F : public C1 {}; // Single path to B with virtual.
9 struct G1 : public B {};
10 struct G2 : public B {};
11 struct H : public G1, public G2 {}; // Ambiguous path to B.
12
13 enum Enum { En1, En2 };
14 enum Onom { On1, On2 };
15
16 struct Co1 { operator int(); };
17 struct Co2 { Co2(int); };
18 struct Co3 { };
19 struct Co4 { Co4(Co3); operator Co3(); };
20
21 // Explicit implicits
t_529_2()22 void 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
t_529_4()67 void t_529_4()
68 {
69 static_cast<void>(1);
70 static_cast<void>(t_529_4);
71 }
72
73 // Static downcasts
t_529_5_8()74 void 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
t_529_7()103 void 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
t_529_10()115 void 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.
t_529_9()127 void 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
137 namespace pr5261 {
138 struct base {};
139 template<typename E> struct derived : public base {};
140 template<typename E> struct outer {
141 base *pb;
~outerpr5261::outer142 ~outer() { (void)static_cast<derived<E>*>(pb); }
143 };
144 outer<int> EntryList;
145 }
146
147
148 // Initialization by constructor
149 struct X0;
150
151 struct X1 {
152 X1();
153 X1(X1&);
154 X1(const X0&);
155
156 operator X0() const;
157 };
158
159 struct X0 { };
160
test_ctor_init()161 void test_ctor_init() {
162 (void)static_cast<X1>(X1());
163 }
164
165 // Casting away constness
166 struct X2 {
167 };
168
169 struct X3 : X2 {
170 };
171
172 struct X4 {
173 typedef const X3 X3_typedef;
174
fX4175 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].
PR5897()183 void PR5897() { (void)static_cast<const int(*)[1]>((const void*)0); }
184
185 namespace 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
f()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