[Gambas-devel] Proper way to the current object

[Randall Morgan]

Specifically,

In the GslComplex_Add method the line:

// Save the values of the current object into a.
GSL_SET_COMPLEX(&a, THIS->number.real, THIS->number.imagined);

Causes a seg fault while when replaced with:

 GSL_SET_COMPLEX(&a, 10.0, 12.0);

The method functions as expected.

Testing seems to indicate that the value of THIS is null. THIS is defined
in the class header file as:

#define THIS ((GSLCOMPLEX *)_object)

It was my understanding that the above line would result in a pointer to
the current object. And in the get/set property methods it seems to work
that way.




2012/2/11 Benoît Minisini <gambas at ...1...>

> Le 09/02/2012 15:56, Randall Morgan a écrit :
> > Hi Benoit,
> >
> > I am a bit perplexed. I have some code that works and some that
> > doesn't... I think I have been looking at the code too long to see the
> > issue. So I was hoping your eyes might help.
> >
> > I have used:
> >
> > #define THIS ((GSLCOMPLEX *) _object)  -- in c_complex.h
> >
> > to get a pointer to the current object of type GSLCOMPLEX.
> >
> > Next I use:
> >
> > THIS->number.real;
> >
> > to access the value stored in the real member of the number structure.
> > The number structure is a member of the GSLCOMPLEX structure
> >
> > The structures are defined as below:
> >
> > typedef
> >      struct __GSLCOMPLEXNUM
> >      {
> >          double real;
> >          double imagined;
> >      }
> >      GSLCOMPLEXNUM;
> >
> > typedef
> >      struct __GSLCOMPLEX
> >      {
> >          GB_BASE ob;
> >          GSLCOMPLEXNUM number;
> >      }
> >      GSLCOMPLEX;
> >
> > This seems to work when I am simply passing a value to store in the
> > property but causes seg faults when I try to pass the value of
> > THIS->number.real to a function.
> > I know I have missed something very elementary but simply can't see it
> > at this moment... Once you respond I know I will be kicking myself for
> > not seeing it!
> >
> > What I need to do is pass the values stored in GSLCOMPLEX->number.real,
> > and GSLCOMPLEX->number.imagined to c function.
> >
> > My guess is that my method of getting the current object is not working
> > as at times I seem to get a null value for THIS and a value of 0x8 for
> > THIS->number.
> >
> >
> > Thanks for the help!
> >
> >
>
> Please be more precise. Which code does not work exactly?
>
> --
> Benoît Minisini
>
>
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