clang/test/Parser/cxx2a-spaceship.cpp

   1 // RUN: %clang_cc1 -std=c++2a -verify %s
   2
   3 template<int> struct X {};
   4
   5 X<1> operator<<(X<0>, X<0>);
   6 X<2> operator<=>(X<0>, X<1>);
   7 X<2> operator<=>(X<1>, X<0>);
   8 X<3> operator<(X<0>, X<2>);
   9 X<3> operator<(X<2>, X<0>);
  10
  11 void f(X<0> x0, X<1> x1) {
  12   X<2> a = x0 <=> x0 << x0;
  13   X<2> b = x0 << x0 <=> x0; // expected-warning {{overloaded operator << has higher precedence than comparison operator}} expected-note 2{{}}
  14   X<3> c = x0 < x0 <=> x1;
  15   X<3> d = x1 <=> x0 < x0;
  16   X<3> e = x0 < x0 <=> x0 << x0;
  17   X<3> f = x0 << x0 <=> x0 < x0; // expected-warning {{overloaded operator << has higher precedence than comparison operator}} expected-note 2{{}}
  18 }
  19
  20 struct PR41991 {
  21   [[nodiscard]] friend bool operator==(const PR41991&, const PR41991&) = default;
  22   [[nodiscard]] friend bool operator!=(const PR41991&, const PR41991&) = delete;
  23   [[nodiscard]] friend bool operator<(const PR41991&, const PR41991&); // expected-error {{an attribute list cannot appear here}}
  24 };