Re: Structures not behaving as value types

> Mask1 = (formula for computing the next unused mask value)
> Debug.WriteLine(Mask1.ToString))
> Mask2 = (same formula)
> Debug.WriteLine(Mask1.ToString)) ' Yes, Mask1, not Mask2
>

It might be a simple typo. Your Writelines both call Mask1 instead of Mask1
and Mask2.

P

--------------------------------------------------
From: "Richard Kucia" <[email protected]>
Sent: Friday, February 22, 2008 12:54 PM
To: <[email protected]>
Subject: [DOTNET-CLR] Structures not behaving as value types

> I have a VB.Net declaration of a structure strFieldMask. The intended
> purpose is to store a bunch of bits, like a bit vector. The structure also
> has operator declarations for =, <>, And, Or, Not and <<, plus some other
> methods for bit manipulation.
>
> The problem is that variables of type strFieldMask seem to behave as
> though there was a singleton strFieldMask and all instances shared it.
>
> Consider this:
>
> Dim Mask1 as strFieldMask
> Dim Mask2 as strFieldMask
>
> Mask1 = (formula for computing the next unused mask value)
> Debug.WriteLine(Mask1.ToString))
> Mask2 = (same formula)
> Debug.WriteLine(Mask1.ToString)) ' Yes, Mask1, not Mask2
>
> The result from the first WriteLine might be "0x10" and the result from
> the second WriteLine might be "0x20".
>
> I've successfully used structures before, but this is the first time I've
> tried overloading the operators. Has that caused the behavior I'm seeing?
>
> Thanks.
>
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