Jake,
Thanks for the response I was just wondering what other people were doing.
----- Original Message -----
From: "Jake Donham" <[EMAIL PROTECTED]>
To: "Palm Developer Forum" <[EMAIL PROTECTED]>
Sent: Monday, December 03, 2001 3:36 PM
Subject: Re: use of new and delete
> On Mon, 3 Dec 2001, Richard Bell wrote:
>
> > I'm using C++ for my Palm OS application and was wondering if using new
and
> > delete for creating/destroying pointers to classes is the right
approach. I
> > would rather create a handle and lock unlock it when I access the class,
are
> > there any issues with this I should be aware of? I'm thinking that the
> > following code would work:
> >
> > MemHandle h;
> > MyClass *pClass;
> >
> > h=MemHandleNew(sizeof(MyClass));
> > if (h)
> > {
> > pClass = (MyClass*) MemHandleLock(h);
> > pClass->MyClass(); // call the constructor
> > MemHandleUnlock(h);
> > }
> >
> > ...
> > if (h)
> > {
> > pClass = (MyClass*) MemHandleLock(h);
> > pClass->~MyClass(); // call the destructor
> > MemHandleUnlock(h);
> > MemHandleFree(h);
> > }
>
> I don't think you can call a C++ constructor like that--think you need to
> overload the placement new operator to explicitly construct memory.
>
> If you really want handle behavior, you might think about defining some
> handle classes (MyClassHandle for each MyClass) so you don't have to cast
> things and explicitly call destructors etc. all over the place. These
> could provide lock/unlock methods or even auto-locking around method
> calls.
>
> But consider just using direct pointers. The handle business is an OK hack
> if you're really concerned about memory fragmentation, but that just isn't
> an issue on today's 8-Mb devices, particularly for small allocations like
> individual objects, and it's a lot of hassle.
>
> Jake
>
>
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