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On 12/25/21 12:48 AM Rob McDonald wrote:
I have a class derived from Fl_Double_Window.
That Fl_Double_Window has a Fl_Group that ends up holding an
Fl_Text_Display.
The class also has a Fl_Text_Buffer associated with the Fl_Text_Display.
I am working on the destructor for my class.
If I call delete on the Fl_Text_Buffer, then the Buffer is destroyed
before the Fl_Text_Display destructor gets called (through the
Fl_Double_Window and Fl_Group destructors).
I've tried setting the Fl_Text_Display's buffer to NULL before
destructing the buffer. This seems to 'work', but also seems
extremely hacky.
Foo::~Foo()
{
m_Display->buffer( NULL );
delete m_Buffer;
}
Is this the proper way to clean up in this situation?
Yes, I think this is the correct solution. Think about the way you
create the two objects (Fl_Text_Display and Fl_Text_Buffer) and then
connect them. Destroying them correctly would be the opposite order:
break the connection, then delete the two objects. Since Fl_Text_Display
and Fl_Text_Buffer are independent of each other the order wouldn't matter.
However, if you deleted the Fl_Text_Display object first it should work
as well because it would break the connection in its destructor. The
only thing you must not do is to delete the Fl_Text_Buffer first while
it is still asscociated with the Fl_Text_Display.
I might be able to make the Fl_Text_Buffer a direct member variable
(instead of a pointer allocated with new), but I can still imagine
situations where this would arise.
Am I missing something?
Not really AFAICT, but remember the fact that one Fl_Text_Buffer can be
associated with more than one Fl_Text_Display or Fl_Text_Editor at the
same time or of course one after the other with the same
Fl_Text_Display. There's no automatism to destroy them together because
there's no "ownership". The Fl_Text_Buffer does not even "know" that it
is associated with one or more Fl_Text_Display's.
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