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Side by Side Diff: Source/wtf/BloomFilter.h

Issue 802203004: replace COMPILE_ASSERT with static assert in wtf/ (Closed) Base URL: https://chromium.googlesource.com/chromium/blink.git@master
Patch Set: final fixups Created 6 years ago
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1 /* 1 /*
2 * Copyright (C) 2011 Apple Inc. All rights reserved. 2 * Copyright (C) 2011 Apple Inc. All rights reserved.
3 * 3 *
4 * Redistribution and use in source and binary forms, with or without 4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions 5 * modification, are permitted provided that the following conditions
6 * are met: 6 * are met:
7 * 1. Redistributions of source code must retain the above copyright 7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer. 8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright 9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the 10 * notice, this list of conditions and the following disclaimer in the
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30 #include "wtf/text/AtomicString.h" 30 #include "wtf/text/AtomicString.h"
31 31
32 namespace WTF { 32 namespace WTF {
33 33
34 // Counting bloom filter with k=2 and 8 bit counters. Uses 2^keyBits bytes of me mory. 34 // Counting bloom filter with k=2 and 8 bit counters. Uses 2^keyBits bytes of me mory.
35 // False positive rate is approximately (1-e^(-2n/m))^2, where n is the number o f unique 35 // False positive rate is approximately (1-e^(-2n/m))^2, where n is the number o f unique
36 // keys and m is the table size (==2^keyBits). 36 // keys and m is the table size (==2^keyBits).
37 template <unsigned keyBits> 37 template <unsigned keyBits>
38 class BloomFilter { 38 class BloomFilter {
39 public: 39 public:
40 COMPILE_ASSERT(keyBits <= 16, bloom_filter_key_size); 40 static_assert(keyBits <= 16, "bloom filter key size check");
41 41
42 static const size_t tableSize = 1 << keyBits; 42 static const size_t tableSize = 1 << keyBits;
43 static const unsigned keyMask = (1 << keyBits) - 1; 43 static const unsigned keyMask = (1 << keyBits) - 1;
44 static uint8_t maximumCount() { return std::numeric_limits<uint8_t>::max(); } 44 static uint8_t maximumCount() { return std::numeric_limits<uint8_t>::max(); }
45 45
46 BloomFilter() { clear(); } 46 BloomFilter() { clear(); }
47 47
48 void add(unsigned hash); 48 void add(unsigned hash);
49 void remove(unsigned hash); 49 void remove(unsigned hash);
50 50
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130 } 130 }
131 return true; 131 return true;
132 } 132 }
133 #endif 133 #endif
134 134
135 } 135 }
136 136
137 using WTF::BloomFilter; 137 using WTF::BloomFilter;
138 138
139 #endif 139 #endif
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