Method DescribeTo

cpp/src/arrow/testing/matchers.h:291–291

  operator testing::Matcher<Res>() const {  // NOLINT runtime/explicit
    struct Impl : testing::MatcherInterface<const Res&> {
      void DescribeTo(::std::ostream* os) const override { *os << "is ok"; }

      void DescribeNegationTo(::std::ostream* os) const override { *os << "is not ok"; }