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/**
* 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;
/**
* Operations on individual bits
*/
public class Bits
{
£>for T in char byte short int long; do
/**
* Sets or clears individual bits in an integer
*
* @param value The value to modify
* @param mask Mask of bits to modify
* @param flag 1 if the bit should be set, 0 if the bit should be clears
* @return The value with the bits modified
*/
public static £{T} set_clear(£{T} value, £{T} mask, £{T} flag)
{
return (£{T})(value ^ ((-flag ^ value) & mask));
}
/**
* Sets or clears individual bits in an integer, superscalar version
*
* @param value The value to modify
* @param mask Mask of bits to modify
* @param flag 1 if the bit should be set, 0 if the bit should be clears
* @return The value with the bits modified
*/
public static £{T} set_clear_superscalar(£{T} value, £{T} mask, £{T} flag)
{
return (£{T})((value & ~mask) | (-flag & mask));
}
/**
* Merge bits from two values
*
* @param zero Integer whose bits should be kept where the mask has zeroes
* @param one Integer whose bits should be kept where the mask has onces
* @param mask The merge mask
* @return {@code (zero & ~mask) | (one & mask)}
*/
public static £{T} merge(£{T} zero, £{T} one, £{T} mask)
{
return (£{T})(zero ^ ((£{T})(zero ^ one) & mask));
}
£>done
}
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