From e7b6163db13d7aae5ada43b3602e279c5ff9121a Mon Sep 17 00:00:00 2001
From: Mattias Andrée <maandree@operamail.com>
Date: Mon, 20 Jan 2014 03:04:51 +0100
Subject: add is power of two
MIME-Version: 1.0
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Signed-off-by: Mattias Andrée <maandree@operamail.com>
---
src/algorithms/bits/Powers.java | 40 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
create mode 100644 src/algorithms/bits/Powers.java
(limited to 'src/algorithms/bits')
diff --git a/src/algorithms/bits/Powers.java b/src/algorithms/bits/Powers.java
new file mode 100644
index 0000000..740399a
--- /dev/null
+++ b/src/algorithms/bits/Powers.java
@@ -0,0 +1,40 @@
+/**
+ * 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;
+ /* Or alternatively: (value & -value) == value */
+ }
+£>done
+}
+
--
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