Prev: TclOO. Some destructor questions
Next: CompIMAGE 2010: Call for Short Communications
From: Donal K. Fellows on 25 Jan 2010 07:59
On 25 Jan, 12:10, pmarin <pacog...(a)gmail.com> wrote:
> 1- have I got to unset explicitly all the variables that a I have set
> in the constructor?

No. They'll go very shortly afterwards when the namespace is torn down
(immediately after the destructor call is done).

> 2- Is there any case when the destructor is called automatically?

Anything that causes the command to be deleted (and which leaves the
interpreter itself working) will start the call of the destructor;
overwriting the object with a [proc] would do it. This is because the
call of the destructor is hung off a command delete trace; the destroy
method could be trivially scripted as just calling 'rename [self] {}'.

Donal.
From: pmarin on 25 Jan 2010 09:49
On Jan 25, 1:59 pm, "Donal K. Fellows"
<donal.k.fell...(a)manchester.ac.uk> wrote:
> On 25 Jan, 12:10, pmarin <pacog...(a)gmail.com> wrote:
>
> > 1- have I got to unset explicitly all the variables that a I have set
> > in the constructor?
>
> No. They'll go very shortly afterwards when the namespace is torn down
> (immediately after the destructor call is done).
>
> > 2- Is there any case when the destructor is called automatically?
>
> Anything that causes the command to be deleted (and which leaves the
> interpreter itself working) will start the call of the destructor;
> overwriting the object with a [proc] would do it. This is because the
> call of the destructor is hung off a command delete trace; the destroy
> method could be trivially scripted as just calling 'rename [self] {}'.
>
> Donal.

I destroy the objects but Tcl is not releasing the memory, The class
ony holds strings:

What am I doing wrong?

oo::class create Object {
constructor {_type _val} {
my variable type
my variable val
my variable marked
set type $_type
set val $_val
set marked 0
}
method val {} {
my variable val
return $val
}

method set_val {_val} {
my variable val
set val $_val
}

method marked {} {
my variable marked
return $marked
}

method set_marked {_val} {
my variable marked
set marked $_val
}
method type {} {
my variable type
return $type
}
destructor {
rename [self] {}
}
}

From: Alexandre Ferrieux on 25 Jan 2010 10:18
On Jan 25, 3:49 pm, pmarin <pacog...(a)gmail.com> wrote:
>
> I destroy the objects but Tcl is not releasing the memory, The class
> ony holds strings:
>
> What am I doing wrong?
>
>    destructor  {
>       rename [self] {}
>    }

The destructor itself will be called as a side-effect of the rename.
So you probably want:

oo::class ... {
destructor {puts DESTROY!!!}
}

proc destroyany ob {rename $ob {}}

::Object create o foo bar

destroyany ::o

=> DESTROY!!!

-Alex

From: pmarin on 25 Jan 2010 10:26
On Jan 25, 4:18 pm, Alexandre Ferrieux <alexandre.ferri...(a)gmail.com>
wrote:
> On Jan 25, 3:49 pm, pmarin <pacog...(a)gmail.com> wrote:
>
>
>
> > I destroy the objects but Tcl is not releasing the memory, The class
> > ony holds strings:
>
> > What am I doing wrong?
>
> >    destructor  {
> >       rename [self] {}
> >    }
>
> The destructor itself will be called as a side-effect of the rename.
> So you probably want:
>
>     oo::class ... {
>      destructor {puts DESTROY!!!}
>     }
>
>     proc destroyany ob {rename $ob {}}
>
>     ::Object create o foo bar
>
>     destroyany ::o
>
>     => DESTROY!!!
>
> -Alex

Ok, but I still not releasing the memory. I am counting
the objects with
llength [info class instances Object]
So I am sure that the objects are destroyed but Tcl does not free the
memory.
From: Alexandre Ferrieux on 25 Jan 2010 10:41
On Jan 25, 4:26 pm, pmarin <pacog...(a)gmail.com> wrote:
>
> >     proc destroyany ob {rename $ob {}}
>
> Ok, but I still not releasing the memory. I am counting
> the objects with
>   llength [info class instances Object]
> So I am sure that the objects are destroyed but Tcl does not free the
> memory.

Tested here, [info class instances Object] is empty after the
[destroyany].
I suspect you have another object, leftover from an earlier test.
Hint: instead of just reading [llength], print the actual list !

-Alex


 |  Next  |  Last
Pages: 1 2
Prev: TclOO. Some destructor questions
Next: CompIMAGE 2010: Call for Short Communications