Shared functions vs Non-Shared Functions
- From: "tshad" <tscheiderich@xxxxxxxxxxxxxxx>
- Date: Thu, 26 May 2005 11:05:08 -0700
I am setting up some of my functions in a class called MyFunctions.
I am not clear as to the best time to set a function as Shared and when not
to. For example, I have the following bit manipulation routines in my
Class:
*******************************************************************************
imports System
NameSpace MyFunctions
Public Class BitHandling
'*----------------------------------------------------------*
'* Name : BitSet *
'*----------------------------------------------------------*
'* Purpose : Sets a given Bit in Number *
'*----------------------------------------------------------*
Public Shared Function BitSet(Number As Integer, _
ByVal Bit As Integer) As Long
If Bit = 31 Then
Number = &H80000000 Or Number
Else
Number = (2 ^ Bit) Or Number
End If
BitSet = Number
End Function
'*----------------------------------------------------------*
'* Name : BitClear *
'*----------------------------------------------------------*
'* Purpose : Clears a given Bit in Number *
'*----------------------------------------------------------*
Public Shared Function BitClear(Number As Integer, _
ByVal Bit As Integer) As Long
If Bit = 31 Then
Number = &H7FFFFFFF And Number
Else
Number = ((2 ^ Bit) Xor &HFFFFFFFF) And Number
End If
BitClear = Number
End Function
'*----------------------------------------------------------*
'* Name : BitIsSet *
'*----------------------------------------------------------*
'* Purpose : Test if bit 0 to bit 31 is set *
'*----------------------------------------------------------*
Public Shared Function BitIsSet(ByVal Number As Integer, _
ByVal Bit As Integer) As Boolean
BitIsSet = False
If Bit = 31 Then
If Number And &H80000000 Then BitIsSet = True
Else
If Number And (2 ^ Bit) Then BitIsSet = True
End If
End Function
End Class
End Namespace
********************************************************************************
Now I have these set up as shared so I don't have to create an instance of
the class:
temp = BitHandling.BitSet(temp,3)
vs.
dim MyBits as new BitHandling
temp = MyBits.BitSet(temp,3)
I am also setting up my function to send out various emails which entails
reading an Sql Record and reading a text file from disk, as well as sending
the email:
SmtpMail.SmtpServer = mailServer
smtpMail.Send(message)
What would tell me that I need to make this a non-shared function vs a
shared one?
Thanks,
Tom
.
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