Merge "VolumeShaper: Fixes for updated Cts test" into oc-dev

    std::string toString() const {

        std::stringstream ss;

        ss << "mInterpolatorType: " << static_cast<int32_t>(mInterpolatorType) << std::endl;

        ss << "mFirstSlope: " << mFirstSlope << std::endl;

        ss << "mLastSlope: " << mLastSlope << std::endl;

        ss << "Interpolator{mInterpolatorType=" << static_cast<int32_t>(mInterpolatorType);

        ss << ", mFirstSlope=" << mFirstSlope;

        ss << ", mLastSlope=" << mLastSlope;

        ss << ", {";

        bool first = true;

        for (const auto &pt : *this) {

            ss << pt.first << " " << pt.second << std::endl;

            if (first) {

                first = false;

                ss << "{";

            } else {

                ss << ", {";

            }

            ss << pt.first << ", " << pt.second << "}";

        }

        ss << "}}";

        return ss.str();

    }

    // spline cubic polynomial coefficient cache

    std::unordered_map<S, std::tuple<S /* c1 */, S /* c2 */, S /* c3 */>> mMemo;

};

}; // Interpolator

} // namespace android