package br.com.etyllica.storage.kdtree;
// DistanceMetric.java : Abstract distance metric class
//
// Copyright (C) Simon D. Levy 2014
//
// This code is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This code is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this code. If not, see <http://www.gnu.org/licenses/>.
// You should also have received a copy of the Parrot Parrot AR.Drone
// Development License and Parrot AR.Drone copyright notice and disclaimer
// and If not, see
// <https://projects.ardrone.org/attachments/277/ParrotLicense.txt>
// and
// <https://projects.ardrone.org/attachments/278/ParrotCopyrightAndDisclaimer.txt>.
//
abstract class DistanceMetric {
protected abstract double distance(double [] a, double [] b);
}