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 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 67 void t_529_4() 68 { 69 static_cast<void>(1); 70 static_cast<void>(t_529_4); 71 } 72 73 // Static downcasts 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 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 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. 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; 142 ~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 { }; 160 161 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; 174 175 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]. 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 { }; 190 191 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
