28 lines
649 B
C
28 lines
649 B
C
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#ifndef _UTIL_BITS_HAMMING
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#define _UTIL_BITS_HAMMING
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#include <string>
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#include "base/logging.h"
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inline int Hamming(const std::string &a, const std::string &b) {
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CHECK_EQ(a.size(), b.size());
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int hamming = 0;
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for (size_t i = 0; i < a.size(); i++)
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hamming += a[i] == b[i];
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return hamming;
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}
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inline int Hamming4(const std::string &a, const std::string &b) {
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CHECK_EQ(a.size(), b.size());
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int hamming = 0;
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const uint32 *au = (const uint32 *)a.data();
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const uint32 *bu = (const uint32 *)b.data();
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for (size_t i = 0; i < a.size() / 4; i++)
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hamming += au[i] == bu[i];
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return hamming * 4;
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}
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#endif // _UTIL_BITS_HAMMING
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