libstdc++-v3/testsuite/23_containers/unordered_map/115939.cc

   1 // { dg-options "-pedantic" }
   2 // { dg-do compile { target c++11 } }
   3
   4 // Bug 115939 - Cannot unambiguously compare iterators in std::unordered_map
   5
   6 #include <unordered_map>
   7
   8 struct any_conv
   9 {
  10   template<typename T>
  11     any_conv(T&&) { }
  12
  13   template<typename T>
  14     friend bool operator==(const any_conv&, const T&) { return true; }
  15
  16   template<typename T>
  17     friend bool operator!=(const any_conv&, const T&) { return false; }
  18 };
  19
  20 std::unordered_map<int, any_conv>::iterator i{};
  21 std::unordered_map<int, any_conv>::const_iterator j{};
  22 bool b1 = i == i; // { dg-bogus "ambiguous" }
  23 bool b2 = j == j; // { dg-bogus "ambiguous" }
  24 bool b3 = i == j; // { dg-bogus "ambiguous" }
  25 bool b4 = j == i; // { dg-bogus "ambiguous" }
  26 bool b5 = i != i; // { dg-bogus "ambiguous" }
  27 bool b6 = j != j; // { dg-bogus "ambiguous" }
  28 bool b7 = i != j; // { dg-bogus "ambiguous" }
  29 bool b8 = j != i; // { dg-bogus "ambiguous" }