Groups > comp.lang.basic.visual.misc > #839

Re: What is a class?

From	"Stuart McCall" <smccall@myunrealbox.com>
Newsgroups	comp.lang.basic.visual.misc
References	(7 earlier) <jicag2$87f$1@dont-email.me> <5odjk75idm6fgl98vbmabap2djd38nvum5@4ax.com> <jicjab$6ta$1@dont-email.me> <6sD2r.204924$WX2.187127@newsfe28.ams2> <jig2oc$mui$1@dont-email.me>
Subject	Re: What is a class?
Message-ID	<_TQ2r.205696$WX2.13665@newsfe28.ams2> (permalink)
Date	2012-02-27 19:24 +0000

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"Bob Butler" <bob_butler@cox.invalid> wrote in message 
news:jig2oc$mui$1@dont-email.me...
>
> "Stuart McCall" <smccall@myunrealbox.com> wrote in message 
> news:6sD2r.204924$WX2.187127@newsfe28.ams2...
>> For instantiation in local scope, I tend to use the construct:
>>
>> With New ClassName
>>    .Property1 = <whatever>
>>    .Method1
>>    'etc
>>    Variable = .Result
>> End With
>>
>> No need for Dim, with or without As New.
>>
>> (just thought I'd throw this into the mix to see what the group make of 
>> it)
>
> I use it in some limited cases.  The only caution I have is that you have 
> to be careful of issues that can leave you with orphaned objects.
>
> In Class1:
> Private Sub Class_Initialize()
> MsgBox "init class"
> End Sub
>
> Private Sub Class_Terminate()
> MsgBox "term class"
> End Sub
>
> Public Sub DoSomething()
> Dim x As Long
> x = 1 / 0
> End Sub
>
> In Module1:
> Sub Main()
> On Error GoTo eh
> With New Class1
>  .DoSomething
> End With
> eh:
> MsgBox "at error handler"
> End Sub
>
> The error handler jumps over the 'End With' without releasing the object. 
> It has local scope so it goes away when the procedure ends but depending 
> on your logic that might not happen right away.  The same thing can happen 
> in other ways:
>
> Sub Main()
> Dim x As Long
> For x = 1 To 10
>  With New Class1
>    Exit For
>  End With
> Next
> MsgBox "post loop"
> End Sub
>
> If code like the above is inside another loop you could end up with 
> multiple orphans and if the logic doesn't allow the procedure to end they 
> will live until it does.  As long as you are sure that nothing will 
> prevent the code from hitting the 'End With' statement it can be a useful 
> consruct.  On the other hand it doesn't really save anything over 
> declaring an object variable and setting it explicitly since that's what 
> happens implicitly anyway.

I agree with all of the above. As I mentioned elsewhere, I only use it when 
I'm reasonably sure no errors will occur. The main attraction for me is 
readability.

Thanks for your comments.

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Thread

What is a class? Peter Nolan <peter.nolan40@gmail.com> - 2012-02-24 04:02 -0800
  Re: What is a class? "Auric__" <not.my.real@email.address> - 2012-02-24 14:06 +0000
    Re: What is a class? Peter Nolan <peter.nolan40@gmail.com> - 2012-02-25 03:07 -0800
      Re: What is a class? Helmut_Meukel <Helmut_Meukel@bn-hof.invalid> - 2012-02-25 14:19 +0100
      Re: What is a class? "Auric__" <not.my.real@email.address> - 2012-02-25 21:26 +0000
        Re: What is a class? Jim Mack <no-uce-ube@mdxi.com> - 2012-02-25 18:58 -0500
          Re: What is a class? GS <gs@somewhere.net> - 2012-02-25 19:39 -0500
          Re: What is a class? "Auric__" <not.my.real@email.address> - 2012-02-26 03:09 +0000
            Re: What is a class? Jim Mack <no-uce-ube@mdxi.com> - 2012-02-25 22:35 -0500
              Re: What is a class? GS <gs@somewhere.net> - 2012-02-25 22:55 -0500
                Re: What is a class? "Farnsworth" <nospam@nospam.com> - 2012-02-25 23:27 -0500
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-26 01:30 -0500
                Re: What is a class? "Auric__" <not.my.real@email.address> - 2012-02-26 04:41 +0000
                Re: What is a class? ralph <nt_consulting64@yahoo.net> - 2012-02-25 23:05 -0600
                Re: What is a class? "Henning" <computer_hero@coldmail.com> - 2012-02-26 11:24 +0100
                Re: What is a class? ralph <nt_consulting64@yahoo.net> - 2012-02-25 23:03 -0600
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-26 01:26 -0500
                Re: What is a class? "Stuart McCall" <smccall@myunrealbox.com> - 2012-02-27 04:15 +0000
                Re: What is a class? ralph <nt_consulting64@yahoo.net> - 2012-02-27 00:48 -0600
                Re: What is a class? "Mayayana" <mayayana@invalid.nospam> - 2012-02-27 08:57 -0500
                Re: What is a class? "Stuart McCall" <smccall@myunrealbox.com> - 2012-02-27 19:19 +0000
                Re: What is a class? "Stuart McCall" <smccall@myunrealbox.com> - 2012-02-27 19:12 +0000
                Re: What is a class? "Bob Butler" <bob_butler@cox.invalid> - 2012-02-27 06:06 -0800
                Re: What is a class? "Stuart McCall" <smccall@myunrealbox.com> - 2012-02-27 19:24 +0000
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-27 11:01 -0500
                Re: What is a class? ralph <nt_consulting64@yahoo.net> - 2012-02-27 11:07 -0600
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-27 13:10 -0500
                Re: What is a class? Schmidt <sss@online.de> - 2012-02-27 19:09 +0100
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-27 13:29 -0500
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-27 14:43 -0500
                Re: What is a class? Schmidt <sss@online.de> - 2012-02-27 22:14 +0100
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-27 16:45 -0500
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-27 18:23 -0500
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-27 23:26 -0500
                Re: What is a class? Schmidt <sss@online.de> - 2012-02-28 13:54 +0100
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-28 08:37 -0500
                Re: What is a class? ralph <nt_consulting64@yahoo.net> - 2012-02-28 09:19 -0600
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-28 10:42 -0500
                Re: What is a class? Schmidt <sss@online.de> - 2012-02-29 06:47 +0100
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-29 09:39 -0500
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-29 13:33 -0500
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-29 14:43 -0500
                Re: What is a class? Schmidt <sss@online.de> - 2012-02-29 21:39 +0100
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-29 16:15 -0500
                Re: What is a class? Schmidt <sss@online.de> - 2012-02-29 23:20 +0100
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-28 00:16 -0500
                Re: What is a class? Jim Mack <no-uce-ube@mdxi.com> - 2012-02-27 13:26 -0500
                Re: What is a class? "Stuart McCall" <smccall@myunrealbox.com> - 2012-02-27 19:33 +0000
                Re: What is a class? Jim Mack <no-uce-ube@mdxi.com> - 2012-02-27 15:50 -0500
                Re: What is a class? Helmut_Meukel <Helmut_Meukel@bn-hof.invalid> - 2012-02-26 11:02 +0100
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-26 14:23 -0500
                Re: What is a class? GS <gs@somewhere.net> - 2012-02-26 17:09 -0500
            Re: What is a class? ralph <nt_consulting64@yahoo.net> - 2012-02-25 22:21 -0600
              Re: What is a class? "Auric__" <not.my.real@email.address> - 2012-02-26 04:51 +0000
                Re: What is a class? ralph <nt_consulting64@yahoo.net> - 2012-02-25 23:10 -0600
        Re: What is a class? Peter Nolan <peter.nolan40@gmail.com> - 2012-02-26 04:11 -0800
          Re: What is a class? Helmut_Meukel <Helmut_Meukel@bn-hof.invalid> - 2012-02-26 16:37 +0100
          Re: What is a class? "Auric__" <not.my.real@email.address> - 2012-02-26 18:36 +0000
            Re: What is a class? ralph <nt_consulting64@yahoo.net> - 2012-02-26 14:11 -0600
            Re: What is a class? Peter Nolan <peter.nolan40@gmail.com> - 2012-02-27 03:11 -0800
              Re: What is a class? "Auric__" <not.my.real@email.address> - 2012-02-27 16:33 +0000
                Re: What is a class? Jim Mack <no-uce-ube@mdxi.com> - 2012-02-27 13:33 -0500
                Re: What is a class? Peter Nolan <peter.nolan40@gmail.com> - 2012-02-28 04:07 -0800
    Re: What is a class? Peter Nolan <peter.nolan40@gmail.com> - 2012-02-25 03:33 -0800
    Re: What is a class? Peter Nolan <peter.nolan40@gmail.com> - 2012-02-25 04:19 -0800
  Re: What is a class? "Ivar" <ivar.ekstromer000@ntlworld.com> - 2012-02-24 15:15 +0000
    Re: What is a class? GS <gs@somewhere.net> - 2012-02-24 14:52 -0500
      Re: What is a class? "Ivar" <ivar.ekstromer000@ntlworld.com> - 2012-02-24 23:10 +0000
        Re: What is a class? GS <gs@somewhere.net> - 2012-02-24 19:46 -0500
          Re: What is a class Way off Topic "Ivar" <ivar.ekstromer000@ntlworld.com> - 2012-02-25 02:20 +0000
            Re: What is a class Way off Topic GS <gs@somewhere.net> - 2012-02-25 16:57 -0500
        Re: What is a class? Helmut_Meukel <Helmut_Meukel@bn-hof.invalid> - 2012-02-25 11:36 +0100
    Re: What is a class? Peter Nolan <peter.nolan40@gmail.com> - 2012-02-25 03:35 -0800
  Re: What is a class? Jim Mack <no-uce-ube@mdxi.com> - 2012-02-24 15:23 -0500
    Re: What is a class? "Auric__" <not.my.real@email.address> - 2012-02-25 01:33 +0000
    Re: What is a class? Peter Nolan <peter.nolan40@gmail.com> - 2012-02-25 03:09 -0800
  Re: What is a class? "Mayayana" <mayayana@invalid.nospam> - 2012-02-24 20:05 -0500

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