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annotate BitArray.hpp @ 69:9161e9fd5b3f

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Taking code out of class definition.
author Tom Fredrik Blenning Klaussen <bfg@bfgconsult.no>
date Sat, 12 Jan 2013 11:50:42 +0100
parents f339499ecd79
children
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b23f04d4a276 Test a custom BitArray.
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1 #ifndef BITARRAY_HPP
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2 #define BITARRAY_HPP
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4 #include <ostream>
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5
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6 #include <cassert>
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7
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8 typedef unsigned char uchar;
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9 typedef unsigned int uint;
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10
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11 class BitArray
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12 {
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13 uint size_;
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14 unsigned char* bits;
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15
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16 public:
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17 BitArray(uint size, bool val);
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18
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19 BitArray(uint size);
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20 BitArray();
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21 BitArray(const BitArray& );
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22
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23 ~BitArray();
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24 bool testBit(uint i) const;
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25 void setBit(uint i, bool val);
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26 uint size() const;
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27 uchar getPaddedChar(size_t offset = 0) const;
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28
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29 bool operator==(const BitArray& rhs) const;
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30 BitArray& operator=(const BitArray& rhs);
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31 };
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32
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33 //We should remove these defines from the header, but we keep them for
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34 //now until we have stabilized the API and removed any bugs.
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35 #define HIGH(B) ((B) >> 3)
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36 #define LOW(B) ((B) & 0x07)
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37 #define MASK(X) (0x1 << (7 - X))
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38 #define SELECTMASK(X) (uchar(MASK(X)))
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39 #define DESELECTMASK(X) (uchar(~MASK(X)))
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40 #define NUMCHARS(X) HIGH(X + 7)
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43
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44 inline BitArray::BitArray(uint size, bool val) : size_(size), bits(new uchar[NUMCHARS(size)])
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45 {
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46 uint n = NUMCHARS(size);
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47 for (uint i = 0; i < n; ++i) {
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48 bits[i] = (val) ? 0xff : 0;
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49 }
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50 }
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51
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52 inline BitArray::BitArray(uint size) : size_(size), bits(new uchar[NUMCHARS(size)])
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53 {
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54 //We need to initialize the bits beyond size, since they are
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55 //implicitly used in certain functions.
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56 bits[NUMCHARS(size) - 1] = 0;
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57 }
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58
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59 inline BitArray::BitArray() : size_(0), bits(0)
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60 {
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61 }
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62
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63 inline bool BitArray::testBit(uint i) const
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64 {
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65 assert(i < size_);
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66 return bits[HIGH(i)] & MASK(LOW(i));
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67 }
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68
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69 inline void BitArray::setBit(uint i, bool val)
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70 {
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71 assert(i < size_);
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72 if (val) {
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73 bits[HIGH(i)] |= SELECTMASK(LOW(i));
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74 }
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75 else {
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76 bits[HIGH(i)] &= DESELECTMASK(LOW(i));
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77 }
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78 }
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79
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80 inline uint BitArray::size() const
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81 {
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82 return size_;
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83 }
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84
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85 inline uchar BitArray::getPaddedChar(size_t offset) const
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86 {
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87 assert(size_ > 0);
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88 assert(HIGH(offset) < NUMCHARS(size_));
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89 if (LOW(offset) == 0)
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90 return bits[HIGH(offset)];
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91
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92 uchar next = ((HIGH(offset) + 1) < NUMCHARS(size_)) ?
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93 bits[HIGH(offset) + 1] : 0;
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94 return ((bits[HIGH(offset)] << 8) | next) >> (8 - LOW(offset));
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95 }
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97 std::ostream& operator<<(std::ostream& out, const BitArray& rhs);
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98
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99 #endif //BITARRAY_HPP