path: root/src/algorithms/bits/Powers.java

/**
 * Copyright © 2014  Mattias Andrée (maandree@member.fsf.org)
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program 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 Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package algorithms.bits;


/**
 * Power of 2 interger operations
 */
public class Powers
{
£>for T in char byte short int long; do
    /**
     * Compute whether an integer is a power of two,
     * note that zero is indeed not a power of two
     * 
     * @param   value  The integer
     * @return         Whether the integer is a power of two
     */
    public static boolean isPowerOf2(£{T} value)
    {
	return (value & (value - 1)) == 0; /* The left hand side clears the least significant bit set */
	/* Or alternatively: (value & -value) == value */
    }
£>done
}