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Microsoft Access VBA and VB6 Module Library

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Class: BitArray in Category General VBA/VB6 : Abstract Data Types from Total Visual SourceBook

Class that implements a bit array in VBA and VB6.

A bit array is an array of bit values, defined as 0 or 1. This class allocates 1 bit for each value you wish to store, resulting in significant memory savings. For example, suppose you wanted to maintain an array of 100 Boolean values. A single Boolean requires 2 bytes of memory, resulting in 200 bytes of memory. Using the bit-array technique available with this class, only 13 bytes of memory are consumed. A zero in the bit array would represent False, and a 1, True.

Procedure List

Procedure Name	Type	Description
(Declarations)	Declarations	Declarations and private variables for the CBitArray class.
Bit	Property	Get the value of the bit specified in the lngBitNumber parameter.
BitCount	Property	Get the number of bits that are set in the bit array.
Count	Property	Get the number of bits represented in this class.

Example Code for Using Class: BitArray

' Example of CBitArray
'
' To try this example, do the following:
' 1. Create a new form
' 2. Add a command button 'cmdTest'
' 3. Paste all the code from this example to the new form's module
' 4. Run the form

Private Sub cmdTest_Click()
  Dim BitOps As CBitArray
  Dim lngCounter As Long

  Set BitOps = New CBitArray

  ' Set the number of bits to hold
  BitOps.Count = 100

  ' Set every 10 bits
  For lngCounter = 0 To 100 Step 10
    BitOps.Bit(lngCounter) = True
  Next lngCounter

  ' Test every five bits
  For lngCounter = 0 To 100 Step 5
    Debug.Print "Bit Number " & lngCounter & " is " & BitOps.Bit(lngCounter)
  Next lngCounter

  ' Indicate how many bits are set
  Debug.Print BitOps.BitCount & " bits are set to true"
End Sub

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