clang/test/CXX/class/class.compare/class.rel/p1.cpp

   1 // RUN: %clang_cc1 -std=c++2a -verify %s
   2
   3 struct Good {
   4   int operator<=>(const Good&) const;
   5
   6   bool operator<(const Good&) const = default;
   7   bool operator>(const Good&) const = default;
   8   friend bool operator<=(const Good&, const Good&) = default;
   9   friend bool operator>=(const Good&, const Good&) = default;
  10 };
  11
  12 enum Bool : bool {};
  13 struct Bad {
  14   bool &operator<(const Bad&) const = default; // expected-error {{return type for defaulted relational comparison operator must be 'bool', not 'bool &'}}
  15   const bool operator>(const Bad&) const = default; // expected-error {{return type for defaulted relational comparison operator must be 'bool', not 'const bool'}}
  16   friend Bool operator<=(const Bad&, const Bad&) = default; // expected-error {{return type for defaulted relational comparison operator must be 'bool', not 'Bool'}}
  17   friend int operator>=(const Bad&, const Bad&) = default; // expected-error {{return type for defaulted relational comparison operator must be 'bool', not 'int'}}
  18 };
  19
  20 template<typename T> struct Ugly {
  21   T operator<(const Ugly&) const = default; // expected-error {{return type}}
  22   T operator>(const Ugly&) const = default; // expected-error {{return type}}
  23   friend T operator<=(const Ugly&, const Ugly&) = default; // expected-error {{return type}}
  24   friend T operator>=(const Ugly&, const Ugly&) = default; // expected-error {{return type}}
  25 };
  26 template struct Ugly<bool>;
  27 template struct Ugly<int>; // expected-note {{in instantiation of}}