BitArray.h Example File

 // -*- mode:c++; tab-width:2; indent-tabs-mode:nil; c-basic-offset:2 -*-
 #ifndef __BIT_ARRAY_H__
 #define __BIT_ARRAY_H__

 /*
  *  Copyright 2010 ZXing authors. All rights reserved.
  *
  * 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.
  */

 #include <zxing/ZXing.h>
 #include <zxing/common/Counted.h>
 #include <zxing/common/IllegalArgumentException.h>
 #include <zxing/common/Array.h>
 #include <vector>
 #include <limits>
 #include <iostream>

 namespace zxing {

 class BitArray : public Counted {
 public:
     static const int bitsPerWord = std::numeric_limits<unsigned int>::digits;

 private:
     int size;
     ArrayRef<int> bits;
     static const int logBits = ZX_LOG_DIGITS(bitsPerWord);
     static const int bitsMask = (1 << logBits) - 1;

 public:
     BitArray();
     BitArray(int size);
     BitArray(std::vector<int> other);
     ~BitArray();
     int getSize() const;
     int getSizeInBytes() const;

     bool get(int i) const {
         return (bits[i / 32] & (1 << (i & 0x1F))) != 0;
     }

     void set(int i) {
         bits[i / 32] |= 1 << (i & 0x1F);
     }

     void flip(int i) {
         bits[i / 32] ^= 1 << (i & 0x1F);
       }

     int getNextSet(int from);
     int getNextUnset(int from);

     void setBulk(int i, int newBits);
     void setRange(int start, int end);
     void clear();
     bool isRange(int start, int end, bool value);
     std::vector<int>& getBitArray();

     void appendBit(bool bit);
     void appendBits(int value, int numBits);
     void appendBitArray(const BitArray& other);
     void ensureCapacity(int size);

     void xor_(const BitArray& other);

     void toBytes(int bitOffset, std::vector<byte>& array, int offset, int numBytes) const;

     const std::string toString() const;

     static ArrayRef<int> makeArray(int size) {
         return ArrayRef<int>((size + 31) / 32);
       }

     void reverse();

     class Reverse {
     private:
         Ref<BitArray> array;
     public:
         Reverse(Ref<BitArray> array);
         ~Reverse();
     };

 private:
     static int makeArraySize(int size);
 };

 std::ostream& operator << (std::ostream&, BitArray const&);

 }

 #endif // __BIT_ARRAY_H__