Re: [Help-smalltalk] segfault/abort in CPtr>>#value

[Paolo Bonzini]

Stephen Compall wrote:
> wcstok on ##smalltalk asked about a method on gst latest running on
> FreeBSD:
>
> |x y|
>     x := CPtrCType elementType: #int.
>     y := x new.
>     y value
> !
>
> whereas replacing the last statement with "Memory intAt: y address"
> would operate as expected.
>   
The reason is that you have to do "CPtrCType elementType: CIntType" instead.

A more complete example could be something like this:

   |x y|
   x := CPtrCType elementType: CIntType.
   y := x new.
   y value: (CInt value: 15).
   y value printNl.   "Print a CInt"
   y value value printNl.   "Print 15"
   y value free.    "Free the CInt"
   y free    "Free y too"!

Remember that CInt is itself a "int *", so "y" is more like a "int **".

While segfaults should be expected when tinkering with CObjects, getting 
one for an object of the wrong class is a bit too greedy indeed!  That 
will be fixed for 2.3, thanks.

Paolo