1 // RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s 2 namespace Constructor { 3 struct A { 4 A(int); 5 }; 6 7 struct B { 8 explicit B(int); 9 }; 10 11 B::B(int) { } 12 13 struct C { 14 void f(const A&); 15 void f(const B&); 16 }; 17 18 void f(C c) { 19 c.f(10); 20 } 21 } 22 23 namespace Conversion { 24 struct A { 25 operator int(); 26 explicit operator bool(); 27 }; 28 29 A::operator bool() { return false; } 30 31 struct B { 32 void f(int); 33 void f(bool); 34 }; 35 36 void f(A a, B b) { 37 b.f(a); 38 } 39 40 void testExplicit() 41 { 42 // Taken from 12.3.2p2 43 class Y { }; // expected-note {{candidate constructor (the implicit copy constructor) not viable: no known conversion from 'Z' to 'const Y &' for 1st argument}} \ 44 expected-note {{candidate constructor (the implicit move constructor) not viable: no known conversion from 'Z' to 'Y &&' for 1st argument}} \ 45 expected-note {{candidate constructor (the implicit copy constructor) not viable: no known conversion from 'Z' to 'const Y &' for 1st argument}} \ 46 expected-note {{candidate constructor (the implicit move constructor) not viable: no known conversion from 'Z' to 'Y &&' for 1st argument}} 47 48 struct Z { 49 explicit operator Y() const; 50 explicit operator int() const; 51 }; 52 53 Z z; 54 // 13.3.1.4p1 & 8.5p16: 55 Y y2 = z; // expected-error {{no viable conversion from 'Z' to 'Y'}} 56 Y y3 = (Y)z; 57 Y y4 = Y(z); 58 Y y5 = static_cast<Y>(z); 59 // 13.3.1.5p1 & 8.5p16: 60 int i1 = (int)z; 61 int i2 = int(z); 62 int i3 = static_cast<int>(z); 63 int i4(z); 64 // 13.3.1.6p1 & 8.5.3p5: 65 const Y& y6 = z; // expected-error {{no viable conversion from 'Z' to 'const Y'}} 66 const int& y7(z); 67 } 68 69 void testBool() { 70 struct Bool { 71 operator bool(); 72 }; 73 74 struct NotBool { 75 explicit operator bool(); // expected-note {{conversion to integral type 'bool'}} 76 }; 77 Bool b; 78 NotBool n; 79 80 (void) (1 + b); 81 (void) (1 + n); // expected-error {{invalid operands to binary expression ('int' and 'NotBool')}} 82 83 // 5.3.1p9: 84 (void) (!b); 85 (void) (!n); 86 87 // 5.14p1: 88 (void) (b && true); 89 (void) (n && true); 90 91 // 5.15p1: 92 (void) (b || true); 93 (void) (n || true); 94 95 // 5.16p1: 96 (void) (b ? 0 : 1); 97 (void) (n ? 0: 1); 98 99 // 5.19p5: 100 // TODO: After constexpr has been implemented 101 102 // 6.4p4: 103 if (b) {} 104 if (n) {} 105 106 // 6.4.2p2: 107 switch (b) {} // expected-warning {{switch condition has boolean value}} 108 switch (n) {} // expected-error {{switch condition type 'NotBool' requires explicit conversion to 'bool'}} \ 109 expected-warning {{switch condition has boolean value}} 110 111 // 6.5.1: 112 while (b) {} 113 while (n) {} 114 115 // 6.5.2p1: 116 do {} while (b); 117 do {} while (n); 118 119 // 6.5.3: 120 for (;b;) {} 121 for (;n;) {} 122 } 123 124 void testNew() 125 { 126 // 5.3.4p6: 127 struct Int { 128 operator int(); 129 }; 130 struct NotInt { 131 explicit operator int(); // expected-note {{conversion to integral type 'int' declared here}} 132 }; 133 134 Int i; 135 NotInt ni; 136 137 new int[i]; 138 new int[ni]; // expected-error {{array size expression of type 'NotInt' requires explicit conversion to type 'int'}} 139 } 140 141 void testDelete() 142 { 143 // 5.3.5pp2: 144 struct Ptr { 145 operator int*(); 146 }; 147 struct NotPtr { 148 explicit operator int*(); // expected-note {{conversion}} 149 }; 150 151 Ptr p; 152 NotPtr np; 153 154 delete p; 155 delete np; // expected-error {{converting delete expression from type 'NotPtr' to type 'int *' invokes an explicit conversion function}} 156 } 157 158 void testFunctionPointer() 159 { 160 // 13.3.1.1.2p2: 161 using Func = void(*)(int); 162 163 struct FP { 164 operator Func(); 165 }; 166 struct NotFP { 167 explicit operator Func(); 168 }; 169 170 FP fp; 171 NotFP nfp; 172 fp(1); 173 nfp(1); // expected-error {{type 'NotFP' does not provide a call operator}} 174 } 175 } 176
