build/clang-plugin/tests/TestExplicitOperatorBool.cpp

   1 #define MOZ_IMPLICIT __attribute__((annotate("moz_implicit")))
   2
   3 struct Bad {
   4   operator bool(); // expected-error {{bad implicit conversion operator for 'Bad'}} expected-note {{consider adding the explicit keyword to 'operator bool'}}
   5 };
   6 struct Good {
   7   explicit operator bool();
   8 };
   9 struct Okay {
  10   MOZ_IMPLICIT operator bool();
  11 };