Method MatchAndExplain

cpp/src/arrow/testing/matchers.h:195–210

      }

      bool MatchAndExplain(const Res& maybe_value,
                           testing::MatchResultListener* listener) const override {
        if (!maybe_value.status().ok()) {
          *listener << "whose error "
                    << testing::PrintToString(maybe_value.status().ToString())
                    << " doesn't match";
          return false;
        }
        const ValueType& value = maybe_value.ValueOrDie();
        testing::StringMatchResultListener value_listener;
        const bool match = value_matcher_.MatchAndExplain(value, &value_listener);
        *listener << "whose value " << testing::PrintToString(value)
                  << (match ? " matches" : " doesn't match");
        testing::internal::PrintIfNotEmpty(value_listener.str(), listener->stream());
        return match;
      }

      const testing::Matcher<ValueType> value_matcher_;
    };