I'm implementing the --enable-api-exceptions=no functionality for
gnome-vfsmm. I don't see a mailing list dedicated to it, so I consult
the collective wisdom here instead.
Most of the wrapper methods in it have a pattern like this:
void foo()
{
GnomeVFSResult result = gnome_vfs_foo();
handle_result(result);
}
void handle_result(GnomeVFSResult result) throw(Gnome::Vfs::Exception)
{
if(result != GNOME_VFS_OK)
throw(Gnome::Vfs::exception(static_cast<Gnome::Vfs::Result>(result)));
}
To add the exception-less mode, I've converted those to
#ifdef GLIBMM_EXCEPTIONS_ENABLED
void foo()
#else
void foo(std::auto_ptr<Glib::Error>& error)
#endif
{
GnomeVFSResult result = gnome_vfs_foo();
#ifdef GLIBMM_EXCEPTIONS_ENABLED
handle_result(result);
#else
handle_result(result, error);
#endif
}
#ifdef GLIBMM_EXCEPTIONS_ENABLED
void handle_result(GnomeVFSResult result)
{
.. unchanged ...
}
#else
void handle_result(GnomeVFSResult result, std::auto_ptr<Glib::Error>& error)
{
if(result != GNOME_VFS_OK)
{
Gnome::Vfs::exception e(static_cast<Gnome::Vfs::Result>(result));
GError* gerror = NULL;
g_set_error(&gerror,
error_quark(), /* my own custom quark; none is
registered by GnomeVFS */
0, /* dummy code */
e.what().c_str());
error = ::Glib::Error::throw_exception(gerror);
}
}
I've registered a throw function for that custom GQuark above, and it
looks like this:
std::auto_ptr<Glib::Error> throw_func(GError* gobject)
{
Glib::Error* e = new Glib::Error(gobject);
printf ("checkpoint 1..."); fflush (stdout);
std::auto_ptr<Glib::Error> p(e); // this line crashes
printf ("checkpoint 2..."); fflush (stdout); // never appears
return p;
}
Any ideas why the construction of that auto_ptr would fail? I am
absolutely certain that the Glib::Error gets built; the first
checkpoint after it shows up.
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