gcc/testsuite/g++.old-deja/g++.robertl/eb22.C

   1 // { dg-do assemble  }
   2 // Ambiguous conversion, three candidates:
   3 // builtin == (int, int), and the two user-defined operators
   4 // Each one requires a user-defined ICS where another uses builtin conversions,
   5 // so none is the best viable function.
   6
   7 class MyInt
   8 {
   9 public:
  10         MyInt(int = 0) {}
  11         operator int() const {return 2;}
  12 };
  13
  14 bool operator==(const MyInt& a, const int& b)   // { dg-message "operator==" } candidate
  15 {
  16         return (int)a == b;
  17 }
  18
  19 bool operator==(const MyInt& a, const MyInt& b) // { dg-message "operator==" } candidate
  20 {
  21         return (int)a == (int)b;
  22 }
  23
  24 bool f()
  25 {
  26   return 3 == MyInt();                          // { dg-error "ambiguous" "err" }
  27   // { dg-message "operator==" "match candidate text" { target *-*-* } 26 }
  28 }