[squeak-dev] FFI | How to declare pointer to external structure in #fields?
Marcel Taeumel
marcel.taeumel at hpi.de
Tue May 19 06:46:35 UTC 2020
Hi Levente.
> Does MyStruct exist when you're writing this method?
Yes.
> If yes, is there a refence to that class in ExternalType's StructTypes class variable?
Yes.
**
The issue was that I wanted to make a pointer to the struct I am currently (re-)defining:
struct MyStruct {
MyStruct *foobar;
};
Works fine when pointing to other structs. Should code generation work for this case? :-)
Best,
Marcel
Am 18.05.2020 21:28:49 schrieb Levente Uzonyi <leves at caesar.elte.hu>:
Hi Marcel,
On Mon, 18 May 2020, Marcel Taeumel wrote:
> Hi, there!
>
> In the #fields method of a new ExternalStructure, how can I express a pointer to another external structure?
>
> First, non-pointer works as expected:
> ^ #( (other MyStruct) )
>
> Second, this just treats it as a void*, which returns a generic ExternalData:
> ^ #( (other 'MyStruct*') )
This is how it should be written. Does MyStruct exist when you're writing
this method? If yes, is there a refence to that class in ExternalType's
StructTypes class variable?
Levente
>
> Third, this gives me a debugger:
> ^ #( (other MyStruct *) )
>
> :-)
>
> Best,
> Marcel
>
>
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