resolved conflicts for merge of 9e660c82 to master

Change-Id: Ic4bd85cbaa5b9a10dcb474a0dad46490bf967e43

1 files changed, 67 insertions, 0 deletions

diff --git a/include/utils/BitSet.h b/include/utils/BitSet.h
new file mode 100644
index 0000000..19c8bf0
--- /dev/null
+++ b/include/utils/BitSet.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef UTILS_BITSET_H
+#define UTILS_BITSET_H
+
+#include <stdint.h>
+
+/*
+ * Contains some bit manipulation helpers.
+ */
+
+namespace android {
+
+// A simple set of 32 bits that can be individually marked or cleared.
+struct BitSet32 {
+    uint32_t value;
+
+    inline BitSet32() : value(0) { }
+    explicit inline BitSet32(uint32_t value) : value(value) { }
+
+    // Gets the value associated with a particular bit index.
+    static inline uint32_t valueForBit(uint32_t n) { return 0x80000000 >> n; }
+
+    // Clears the bit set.
+    inline void clear() { value = 0; }
+
+    // Returns true if the bit set does not contain any marked bits.
+    inline bool isEmpty() const { return ! value; }
+
+    // Returns true if the specified bit is marked.
+    inline bool hasBit(uint32_t n) const { return value & valueForBit(n); }
+
+    // Marks the specified bit.
+    inline void markBit(uint32_t n) { value |= valueForBit(n); }
+
+    // Clears the specified bit.
+    inline void clearBit(uint32_t n) { value &= ~ valueForBit(n); }
+
+    // Finds the first marked bit in the set.
+    // Result is undefined if all bits are unmarked.
+    inline uint32_t firstMarkedBit() const { return __builtin_clz(value); }
+
+    // Finds the first unmarked bit in the set.
+    // Result is undefined if all bits are marked.
+    inline uint32_t firstUnmarkedBit() const { return __builtin_clz(~ value); }
+
+    inline bool operator== (const BitSet32& other) const { return value == other.value; }
+    inline bool operator!= (const BitSet32& other) const { return value != other.value; }
+};
+
+} // namespace android
+
+#endif // UTILS_BITSET_H