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BitUtil.h
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1 // Copyright (c) 2009-2014 Alan Wright. All rights reserved.
3 // Distributable under the terms of either the Apache License (Version 2.0)
4 // or the GNU Lesser General Public License.
6
7 #ifndef BITUTIL_H
8 #define BITUTIL_H
9
10 #include "LuceneObject.h"
11
12 namespace Lucene {
13
15 class LPPAPI BitUtil : public LuceneObject {
16 public:
17 virtual ~BitUtil();
18 LUCENE_CLASS(BitUtil);
19
20 public:
22 static const uint8_t ntzTable[];
23
24 public:
26 static int32_t pop(int64_t x);
27
29 static int64_t pop_array(const int64_t* A, int32_t wordOffset, int32_t numWords);
30
32 static int64_t pop_intersect(const int64_t* A, const int64_t* B, int32_t wordOffset, int32_t numWords);
33
35 static int64_t pop_union(const int64_t* A, const int64_t* B, int32_t wordOffset, int32_t numWords);
36
38 static int64_t pop_andnot(const int64_t* A, const int64_t* B, int32_t wordOffset, int32_t numWords);
39
41 static int64_t pop_xor(const int64_t* A, const int64_t* B, int32_t wordOffset, int32_t numWords);
42
44 static int32_t ntz(int64_t val);
45
47 static int32_t ntz(int32_t val);
48
51 static int32_t ntz2(int64_t x);
52
55 static int32_t ntz3(int64_t x);
56
58 static bool isPowerOfTwo(int32_t v);
59
61 static bool isPowerOfTwo(int64_t v);
62
64 static int32_t nextHighestPowerOfTwo(int32_t v);
65
67 static int64_t nextHighestPowerOfTwo(int64_t v);
68
69 protected:
70 inline static void CSA(int64_t& h, int64_t& l, int64_t a, int64_t b, int64_t c);
71 };
72
73 }
74
75 #endif
LuceneObject.h
Lucene::LuceneObject
Base class for all Lucene classes.
Definition: LuceneObject.h:31
LUCENE_CLASS
#define LUCENE_CLASS(Name)
Definition: LuceneObject.h:24
Lucene
Definition: AbstractAllTermDocs.h:12
Lucene::BitUtil
A variety of high efficiency bit twiddling routines.
Definition: BitUtil.h:15

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