1 // RUN: %clang_cc1 -fsyntax-only -verify -Wno-bool-conversion %s 2 3 typedef __typeof__(((int*)0)-((int*)0)) ptrdiff_t; 4 5 namespace DontResolveTooEarly_WaitForOverloadResolution 6 { 7 template <class T> T* f(int); // #1 8 template <class T, class U> T& f(U); // #2 9 10 void g() { 11 int *ip = f<int>(1); // calls #1 12 } 13 14 template <class T> 15 T* f2(int); 16 template <class T, class U> 17 T& f2(U); 18 19 void g2() { 20 int*ip = (f2<int>)(1); // ok 21 } 22 23 } // End namespace 24 25 namespace DontAllowUnresolvedOverloadedExpressionInAnUnusedExpression 26 { 27 void one() { } 28 template<class T> void oneT() { } 29 30 void two() { } // expected-note 2 {{possible target for call}} 31 void two(int) { } // expected-note 2 {{possible target for call}} 32 template<class T> void twoT() { } // expected-note 2 {{possible target for call}} 33 template<class T> void twoT(T) { } // expected-note 2 {{possible target for call}} 34 35 void check() 36 { 37 one; // expected-warning {{expression result unused}} 38 two; // expected-error{{reference to overloaded function could not be resolved; did you mean to call it with no arguments?}} 39 oneT<int>; // expected-warning {{expression result unused}} 40 twoT<int>; // expected-error {{reference to overloaded function could not be resolved; did you mean to call it?}} 41 } 42 43 // check the template function case 44 template<class T> void check() 45 { 46 one; // expected-warning {{expression result unused}} 47 two; // expected-error{{reference to overloaded function could not be resolved; did you mean to call it with no arguments?}} 48 oneT<int>; // expected-warning {{expression result unused}} 49 twoT<int>; // expected-error {{reference to overloaded function could not be resolved; did you mean to call it?}} 50 51 } 52 53 } 54 55 template<typename T> 56 void twoT() { } 57 template<typename T, typename U> 58 void twoT(T) { } 59 60 61 void two() { }; //expected-note 5{{candidate}} 62 void two(int) { }; //expected-note 5{{candidate}} 63 64 65 66 void one() { } 67 template<class T> 68 void oneT() { } 69 70 template<class T> 71 void cant_resolve() { } //expected-note 3{{candidate}} 72 73 template<class T> void cant_resolve(T) { }//expected-note 3{{candidate}} 74 75 76 int main() 77 { 78 79 { static_cast<void>(one); } 80 { (void)(one); } 81 { static_cast<void>(oneT<int>); } 82 { (void)(oneT<int>); } 83 84 { static_cast<void>(two); } // expected-error {{address of overloaded function 'two' cannot be static_cast to type 'void'}} 85 { (void)(two); } // expected-error {{address of overloaded function 'two' cannot be cast to type 'void'}} 86 { static_cast<void>(twoT<int>); } 87 { (void)(twoT<int>); } 88 89 90 { ptrdiff_t x = reinterpret_cast<ptrdiff_t>(oneT<int>); } 91 { (void) reinterpret_cast<int (*)(char, double)>(oneT<int>); } 92 { (void) reinterpret_cast<ptrdiff_t>(one); } 93 { (void) reinterpret_cast<int (*)(char, double)>(one); } 94 95 { ptrdiff_t x = reinterpret_cast<ptrdiff_t>(twoT<int>); } 96 { (void) reinterpret_cast<int (*)(char, double)>(twoT<int>); } 97 { (void) reinterpret_cast<void (*)(int)>(two); } //expected-error {{reinterpret_cast}} 98 { (void) static_cast<void (*)(int)>(two); } //ok 99 100 { (void) reinterpret_cast<int>(two); } //expected-error {{reinterpret_cast}} 101 { (void) reinterpret_cast<int (*)(char, double)>(two); } //expected-error {{reinterpret_cast}} 102 103 { bool b = (twoT<int>); } 104 { bool b = (twoT<int, int>); } 105 106 { bool b = &twoT<int>; //&foo<int>; } 107 b = &(twoT<int>); } 108 109 { ptrdiff_t x = (ptrdiff_t) &twoT<int>; 110 x = (ptrdiff_t) &twoT<int>; } 111 112 { ptrdiff_t x = (ptrdiff_t) twoT<int>; 113 x = (ptrdiff_t) twoT<int>; } 114 115 116 { ptrdiff_t x = (ptrdiff_t) &twoT<int,int>; 117 x = (ptrdiff_t) &twoT<int>; } 118 119 { oneT<int>; &oneT<int>; } //expected-warning 2{{expression result unused}} 120 { static_cast<void>(cant_resolve<int>); } // expected-error {{address of overload}} 121 { bool b = cant_resolve<int>; } // expected-error {{address of overload}} 122 { (void) cant_resolve<int>; } // expected-error {{address of overload}} 123 124 } 125 126 namespace member_pointers { 127 struct S { 128 template <typename T> bool f(T) { return false; } 129 template <typename T> static bool g(T) { return false; } 130 131 template <typename T> bool h(T) { return false; } // expected-note 3 {{possible target for call}} 132 template <int N> static bool h(int) { return false; } // expected-note 3 {{possible target for call}} 133 }; 134 135 void test(S s) { 136 if (S::f<char>) return; // expected-error {{call to non-static member function without an object argument}} 137 if (S::f<int>) return; // expected-error {{call to non-static member function without an object argument}} 138 if (&S::f<char>) return; 139 if (&S::f<int>) return; 140 if (s.f<char>) return; // expected-error {{reference to non-static member function must be called}} 141 if (s.f<int>) return; // expected-error {{reference to non-static member function must be called}} 142 if (&s.f<char>) return; // expected-error {{cannot create a non-constant pointer to member function}} 143 if (&s.f<int>) return; // expected-error {{cannot create a non-constant pointer to member function}} 144 145 if (S::g<char>) return; 146 if (S::g<int>) return; 147 if (&S::g<char>) return; 148 if (&S::g<int>) return; 149 if (s.g<char>) return; 150 if (s.g<int>) return; 151 if (&s.g<char>) return; 152 if (&s.g<int>) return; 153 154 if (S::h<42>) return; 155 if (S::h<int>) return; // expected-error {{reference to overloaded function could not be resolved; did you mean to call it?}} 156 if (&S::h<42>) return; 157 if (&S::h<int>) return; 158 if (s.h<42>) return; 159 if (s.h<int>) return; // expected-error {{reference to overloaded function could not be resolved; did you mean to call it?}} 160 if (&s.h<42>) return; 161 if (&s.h<int>) return; // expected-error {{reference to overloaded function could not be resolved; did you mean to call it?}} 162 163 { bool b = S::f<char>; } // expected-error {{call to non-static member function without an object argument}} 164 { bool b = S::f<int>; } // expected-error {{call to non-static member function without an object argument}} 165 { bool b = &S::f<char>; } 166 { bool b = &S::f<int>; } 167 // These next two errors are terrible. 168 { bool b = s.f<char>; } // expected-error {{reference to non-static member function must be called}} 169 { bool b = s.f<int>; } // expected-error {{reference to non-static member function must be called}} 170 { bool b = &s.f<char>; } // expected-error {{cannot create a non-constant pointer to member function}} 171 { bool b = &s.f<int>; } // expected-error {{cannot create a non-constant pointer to member function}} 172 173 { bool b = S::g<char>; } 174 { bool b = S::g<int>; } 175 { bool b = &S::g<char>; } 176 { bool b = &S::g<int>; } 177 { bool b = s.g<char>; } 178 { bool b = s.g<int>; } 179 { bool b = &s.g<char>; } 180 { bool b = &s.g<int>; } 181 182 { bool b = S::h<42>; } 183 { bool b = S::h<int>; } // expected-error {{can't form member pointer of type 'bool' without '&' and class name}} 184 { bool b = &S::h<42>; } 185 { bool b = &S::h<int>; } 186 { bool b = s.h<42>; } 187 { bool b = s.h<int>; } // expected-error {{can't form member pointer of type 'bool' without '&' and class name}} 188 { bool b = &s.h<42>; } 189 { bool b = &s.h<int>; } // expected-error {{can't form member pointer of type 'bool' without '&' and class name}} 190 } 191 } 192
