Re: Why this code doesn't work?

[Phil Wolff <adiabat centurylink net>]

Whereas you and I are running Linux, codekiddy appears to be working 
under Windows:

    Glib::RefPtr<Gtk::Application> app = Gtk::Application::create( 
argc, argv, "gtkmm.exe" );

Shouldn't matter, but....


On 12/21/2015 04:48 AM, Kjell Ahlstedt wrote:
> I have tested your original test case (without layout->reference()) 
> with two combinations of module versions. I have used valgrind to find 
> illegal memory accesses.
>
> Test 1: gtkmm 3.16.0, gtk+ 3.16.7, pangomm 2.36.0, pango 1.36.8, 
> glibmm 2.44.0, glib 2.46.1
> Test 2: gtkmm 3.19.3, gtk+ 3.19.5, pangomm 2.39.1, pango 1.39.0, 
> glibmm 2.47.4, glib 2.47.4
>
> No crash or other unexpected behavior. I've also tested by combining 
> gtkmm 3.16.0 with pangomm 2.39.1. Behaves as it should. I've also run 
> the test case gtkmm-documentation/examples/book/drawingarea/pango_text 
> that you asked about in a previous post on this mailing list. I only 
> tested with the newest versions of gtkmm etc. No crash or other sign 
> of illegal memory access.
>
> I don't understand what makes it behave differently when you test it.
>
> Kjell
>
> Den 2015-12-19 kl. 21:06, skrev codekiddy:
> > I also have gtkmm 3.16.0 but pango version is 2.38.1
> >
> > I also figured out there must some sort of forgotten reference count, 
> > after looking at stack trace layout destructor gets called twice (not 
> > sure), once by ~RefPtr::Layout and another time by Pango::Layout::~Layout
> >
> > to make the code work I have done this, but I'm not sure how safe is 
> > this. but it works ^^ and no throw is made from Layout's destructor.
> >
> > int main(int argc, char* argv[])
> > {
> > Glib::RefPtr<Gtk::Application> app = Gtk::Application::create( argc, 
> > argv, "gtkmm.exe" );
> >
> > class TestClass :
> > public Gtk::Window
> > {
> > public:
> > TestClass()
> > {
> > layout = (create_pango_layout("blah"));
> > layout->reference();
> > }
> >
> > Glib::RefPtr<Pango::Layout> layout;
> > };
> >
> > TestClass* instance = new TestClass;
> > app->run(*instance);
> > delete instance;
> > }
>
>
>
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