[Vala] How to deal with "target" attribute in VAPI for C struct?

[mar...@saepia.net]

Hi,

I have a part of C code that I need to include in my Vala project.

It contains code +/- like that:

typedef void (*computing_finished_cb) (void *self);

typedef struct computer {
computing_finished_cb on_finished;
void* parent;
} computer;

size_t computer_compute(computer *c);

I've created VAPI file like that

namespace MyLib {
[CCode (cname="computer", cheader_filename="computer.h")]
public struct Computer {
ComputingFinishedCallback on_finished;
void* parent;

[CCode (cname="computer_compute")]
public compute();
}
[CCode (cname="computing_finished_cb", has_target=false)]
public delegate void ComputingFinishedCallback();
}

Now I can use it like that:

public class Example {
public MyLib.Computer computer;

public Example() {
computer = MyLib.Computer();
computer.parent = this; // code in compute() knows that it has to
pass this pointer to the callback when computing is finished
computer.on_finished = on_finished;
}

public void compute() {
computer.compute();
}

static void on_finished(void* sender) {
MyLib.Computer computer = sender as MyLib.Computer;

computer.do_something_else();
}

public void do_something_else() {
//...
}
}

It works but it breaks encapsulation as if I want to access anything
from on_finished() I have to mark it public.

Could you give me any advise how to modify that to achieve Vala-style
code? Like that...?

public class Example {
public MyLib.Computer computer;

public Example() {
computer = MyLib.Computer(this);
computer.on_finished = on_finished;
}

public void compute() {
computer.compute();
}

private void on_finished() {
do_something_else();
}

private void do_something_else() {
//...
}
}

The problem that I've encountered is that when I remove
"has_target=false" from VAPI, vala tries to initialize *_target and
*_target_destroy_notify functions per each callback member of the
struct, do a lot of ref & unrefs etc... Is there any clean way to do
that? Preferably without changing struct to full-flavored GObject?

Thank you in advance,

m.
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[mar...@saepia.net]

Ugh, sorry, obviously that code:

>  public delegate void ComputingFinishedCallback();

should be:

public delegate void ComputingFinishedCallback(void* sender);