clang/test/SemaCXX/ambig-user-defined-conversions.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify %s
   2
   3 namespace test0 {
   4   struct BASE {
   5     operator int &(); // expected-note {{candidate function}}
   6   };
   7   struct BASE1 {
   8     operator int &(); // expected-note {{candidate function}}
   9   };
  10
  11   struct B : public BASE, BASE1 {};
  12
  13   extern B f();
  14   B b1;
  15
  16   void func(const int ci, const char cc);
  17   void func(const char ci, const B b); // expected-note {{candidate function}}
  18   void func(const B b, const int ci); // expected-note {{candidate function}}
  19
  20   const int Test1() {
  21
  22     func(b1, f()); // expected-error {{call to 'func' is ambiguous}}
  23     return f(); // expected-error {{conversion from 'B' to 'const int' is ambiguous}}
  24   }
  25
  26   // This used to crash when comparing the two operands.
  27   void func2(const char cc); // expected-note {{candidate function}}
  28   void func2(const int ci); // expected-note {{candidate function}}
  29   void Test2() {
  30     func2(b1); // expected-error {{call to 'func2' is ambiguous}}
  31   }
  32 }
  33
  34 namespace test1 {
  35   struct E;
  36   struct A {
  37     A (E&);
  38   };
  39
  40   struct E {
  41     operator A ();
  42   };
  43
  44   struct C {
  45     C (E&);
  46   };
  47
  48   void f1(A);   // expected-note {{candidate function}}
  49   void f1(C);   // expected-note {{candidate function}}
  50
  51   void Test2()
  52   {
  53     E b;
  54     f1(b);  // expected-error {{call to 'f1' is ambiguous}}
  55             // ambiguous because b -> C via constructor and
  56             // b -> A via constructor or conversion function.
  57   }
  58 }
  59
  60 namespace rdar8876150 {
  61   struct A { operator bool(); };
  62   struct B : A { };
  63   struct C : A { };
  64   struct D : B, C { };
  65
  66   bool f(D d) { return !d; } // expected-error{{ambiguous conversion from derived class 'D' to base class 'rdar8876150::A':}}
  67 }
  68
  69 namespace assignment {
  70   struct A { operator short(); operator bool(); }; // expected-note 2{{candidate}}
  71   void f(int n, A a) { n = a; } // expected-error{{ambiguous}}
  72 }