addr-of-overloaded-function.cpp revision a6dc7eff27a8c59bee42809270971931b811dd44 
1// RUN: %clang_cc1 -fsyntax-only -verify %s
2int f(double); // expected-note{{candidate function}}
3int f(int); // expected-note{{candidate function}}
4
5int (*pfd)(double) = f; // selects f(double)
6int (*pfd2)(double) = &f; // selects f(double)
7int (*pfd3)(double) = ((&((f)))); // selects f(double)
8int (*pfi)(int) = &f;    // selects f(int)
9// FIXME: This error message is not very good. We need to keep better
10// track of what went wrong when the implicit conversion failed to
11// give a better error message here.
12int (*pfe)(...) = &f;    // expected-error{{address of overloaded function 'f' does not match required type 'int (...)'}}
13int (&rfi)(int) = f;     // selects f(int)
14int (&rfd)(double) = f;  // selects f(double)
15
16void g(int (*fp)(int));   // expected-note{{note: candidate function}}
17void g(int (*fp)(float));
18void g(int (*fp)(double)); // expected-note{{note: candidate function}}
19
20int g1(int);
21int g1(char);
22
23int g2(int);
24int g2(double);
25
26template<typename T> T g3(T);
27int g3(int);
28int g3(char);
29
30void g_test() {
31  g(g1);
32  g(g2); // expected-error{{call to 'g' is ambiguous; candidates are:}}
33  g(g3);
34}
35
36template<typename T> T h1(T);
37template<typename R, typename A1> R h1(A1);
38int h1(char);
39
40void ha(int (*fp)(int));
41void hb(int (*fp)(double));
42
43void h_test() {
44  ha(h1);
45  hb(h1);
46}
47
48struct A { };
49void f(void (*)(A *));
50
51struct B
52{
53  void g() { f(d); }
54  void d(void *);
55  static void d(A *);
56};
57
58struct C {
59  C &getC() {
60    return makeAC; // expected-error{{reference to non-static member function must be called}}
61  }
62
63  C &makeAC();
64  const C &makeAC() const;
65
66  static void f(); // expected-note{{candidate function}}
67  static void f(int); // expected-note{{candidate function}}
68
69  void g() {
70    int (&fp)() = f; // expected-error{{address of overloaded function 'f' does not match required type 'int ()'}}
71  }
72};
73
74// PR6886
75namespace test0 {
76  void myFunction(void (*)(void *));
77
78  class Foo {
79    void foo();
80
81    static void bar(void*);
82    static void bar();
83  };
84
85  void Foo::foo() {
86    myFunction(bar);
87  }
88}
89
90namespace PR7971 {
91  struct S {
92    void g() {
93      f(&g);
94    }
95    void f(bool (*)(int, char));
96    static bool g(int, char);
97  };
98}
99
100namespace PR8033 {
101  template <typename T1, typename T2> int f(T1 *, const T2 *); // expected-note 2{{candidate function [with T1 = const int, T2 = int]}}
102  template <typename T1, typename T2> int f(const T1 *, T2 *); // expected-note 2{{candidate function [with T1 = int, T2 = const int]}}
103  int (*p)(const int *, const int *) = f; // expected-error{{address of overloaded function 'f' is ambiguous}} \
104  // expected-error{{address of overloaded function 'f' is ambiguous}}
105
106}
107
108namespace PR8196 {
109  template <typename T> struct mcdata {
110    typedef int result_type;
111  };
112  template <class T>
113    typename mcdata<T>::result_type wrap_mean(mcdata<T> const&);
114  void add_property(double(*)(mcdata<double> const &)); // expected-note{{candidate function not viable: no overload of 'wrap_mean' matching}}
115  void f() {
116    add_property(&wrap_mean); // expected-error{{no matching function for call to 'add_property'}}
117  }
118}
119
120namespace PR7425 {
121  template<typename T>
122  void foo()
123  {
124  }
125
126  struct B
127  {
128    template<typename T>
129    B(const T&)
130    {
131    }
132  };
133
134  void bar(const B& b)
135  {
136  }
137
138  void bar2(const B& b = foo<int>)
139  {
140  }
141
142  void test(int argc, char** argv)
143  {
144    bar(foo<int>);
145    bar2();
146  }
147}
148
149namespace test1 {
150  void fun(int x) {}
151
152  void parameter_number() {
153    void (*ptr1)(int, int) = &fun; // expected-error {{cannot initialize a variable of type 'void (*)(int, int)' with an rvalue of type 'void (*)(int)': different number of parameters (2 vs 1)}}
154    void (*ptr2)(int, int);
155    ptr2 = &fun;  // expected-error {{assigning to 'void (*)(int, int)' from incompatible type 'void (*)(int)': different number of parameters (2 vs 1)}}
156  }
157
158  void parameter_mismatch() {
159    void (*ptr1)(double) = &fun; // expected-error {{cannot initialize a variable of type 'void (*)(double)' with an rvalue of type 'void (*)(int)': type mismatch at 1st parameter ('double' vs 'int')}}
160    void (*ptr2)(double);
161    ptr2 = &fun; // expected-error {{assigning to 'void (*)(double)' from incompatible type 'void (*)(int)': type mismatch at 1st parameter ('double' vs 'int')}}
162  }
163
164  void return_type_test() {
165    int (*ptr1)(int) = &fun; // expected-error {{cannot initialize a variable of type 'int (*)(int)' with an rvalue of type 'void (*)(int)': different return type ('int' vs 'void')}}
166    int (*ptr2)(int);
167    ptr2 = &fun;  // expected-error {{assigning to 'int (*)(int)' from incompatible type 'void (*)(int)': different return type ('int' vs 'void')}}
168  }
169
170  int foo(double x, double y) {return 0;} // expected-note {{candidate function has different number of parameters (expected 1 but has 2)}}
171  int foo(int x, int y) {return 0;} // expected-note {{candidate function has different number of parameters (expected 1 but has 2)}}
172  int foo(double x) {return 0;} // expected-note {{candidate function has type mismatch at 1st parameter (expected 'int' but has 'double')}}
173  double foo(float x, float y) {return 0;} // expected-note {{candidate function has different number of parameters (expected 1 but has 2)}}
174  double foo(int x, float y) {return 0;} // expected-note {{candidate function has different number of parameters (expected 1 but has 2)}}
175  double foo(float x) {return 0;} // expected-note {{candidate function has type mismatch at 1st parameter (expected 'int' but has 'float')}}
176  double foo(int x) {return 0;} // expected-note {{candidate function has different return type ('int' expected but has 'double')}}
177
178  int (*ptr)(int) = &foo; // expected-error {{address of overloaded function 'foo' does not match required type 'int (int)'}}
179
180  struct Qualifiers {
181    void N() {};
182    void C() const {};
183    void V() volatile {};
184    void R() __restrict {};
185    void CV() const volatile {};
186    void CR() const __restrict {};
187    void VR() volatile __restrict {};
188    void CVR() const volatile __restrict {};
189  };
190
191
192  void QualifierTest() {
193    void (Qualifiers::*X)();
194    X = &Qualifiers::C; // expected-error {{assigning to 'void (test1::Qualifiers::*)()' from incompatible type 'void (test1::Qualifiers::*)() const': different qualifiers (none vs const)}}
195    X = &Qualifiers::V; // expected-error{{assigning to 'void (test1::Qualifiers::*)()' from incompatible type 'void (test1::Qualifiers::*)() volatile': different qualifiers (none vs volatile)}}
196    X = &Qualifiers::R; // expected-error{{assigning to 'void (test1::Qualifiers::*)()' from incompatible type 'void (test1::Qualifiers::*)() restrict': different qualifiers (none vs restrict)}}
197    X = &Qualifiers::CV; // expected-error{{assigning to 'void (test1::Qualifiers::*)()' from incompatible type 'void (test1::Qualifiers::*)() const volatile': different qualifiers (none vs const and volatile)}}
198    X = &Qualifiers::CR; // expected-error{{assigning to 'void (test1::Qualifiers::*)()' from incompatible type 'void (test1::Qualifiers::*)() const restrict': different qualifiers (none vs const and restrict)}}
199    X = &Qualifiers::VR; // expected-error{{assigning to 'void (test1::Qualifiers::*)()' from incompatible type 'void (test1::Qualifiers::*)() volatile restrict': different qualifiers (none vs volatile and restrict)}}
200    X = &Qualifiers::CVR; // expected-error{{assigning to 'void (test1::Qualifiers::*)()' from incompatible type 'void (test1::Qualifiers::*)() const volatile restrict': different qualifiers (none vs const, volatile, and restrict)}}
201  }
202
203  struct Dummy {
204    void N() {};
205  };
206
207  void (Qualifiers::*X)() = &Dummy::N; // expected-error{{cannot initialize a variable of type 'void (test1::Qualifiers::*)()' with an rvalue of type 'void (test1::Dummy::*)()': different classes ('test1::Qualifiers' vs 'test1::Dummy')}}
208}
209