src/java/org/apache/cassandra/utils/obs/OpenBitSet.java
/**
   * flips a bit.
   * The index should be less than the OpenBitSet size.
   */
flips a bit.
The index should be less than the OpenBitSet size.
flips a bit . The index should be less than the OpenBitSet size .
public void flip(long index) {
    int wordNum = (int)(index >> 6);   
    int bit = (int)index & 0x3f;       
    long bitmask = 1L << bit;
    bits[wordNum / PAGE_SIZE][wordNum % PAGE_SIZE] ^= bitmask;
  }
public void flip ( long index ) { int wordNum = ( int ) ( index >> 6 ) ; int bit = ( int ) index & 0x3f ; long bitmask = 1L << bit ; bits [ wordNum / PAGE_SIZE ] [ wordNum % PAGE_SIZE ] ^= bitmask ; }
flips a bit.
flips a bit .
// div 64 // mod 64