add set_clear

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 53 insertions, 0 deletions

diff --git a/src/algorithms/bits/Bits.java b/src/algorithms/bits/Bits.java
new file mode 100644
index 0000000..327a39e
--- /dev/null
+++ b/src/algorithms/bits/Bits.java
@@ -0,0 +1,53 @@
+/**
+ * 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));
+    }
+£>done
+}
+