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 struct I; // Incomplete.
13 struct J; // Incomplete.
14
15 enum Enum { En1, En2 };
16 enum Onom { On1, On2 };
17
18 struct Co1 { operator int(); };
19 struct Co2 { Co2(int); };
20 struct Co3 { };
21 struct Co4 { Co4(Co3); operator Co3(); };
22
23 // Explicit implicits
t_529_2()24 void 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
t_529_4()69 void t_529_4()
70 {
71 static_cast<void>(1);
72 static_cast<void>(t_529_4);
73 }
74
75 // Static downcasts
t_529_5_8()76 void 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
t_529_7()105 void 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
t_529_10()117 void 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.
t_529_9()129 void 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
140 namespace pr5261 {
141 struct base {};
142 template<typename E> struct derived : public base {};
143 template<typename E> struct outer {
144 base *pb;
~outerpr5261::outer145 ~outer() { (void)static_cast<derived<E>*>(pb); }
146 };
147 outer<int> EntryList;
148 }
149
150
151 // Initialization by constructor
152 struct X0;
153
154 struct X1 {
155 X1();
156 X1(X1&);
157 X1(const X0&);
158
159 operator X0() const;
160 };
161
162 struct X0 { };
163
test_ctor_init()164 void test_ctor_init() {
165 (void)static_cast<X1>(X1());
166 }
167
168 // Casting away constness
169 struct X2 {
170 };
171
172 struct X3 : X2 {
173 };
174
175 struct X4 {
176 typedef const X3 X3_typedef;
177
fX4178 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].
PR5897()186 void PR5897() { (void)static_cast<const int(*)[1]>((const void*)0); }
187
188 namespace 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
f()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