Re: [gtkmm] Slots from non-Gtk subclasses.
- From: Paul Davis <paul linuxaudiosystems com>
- To: Robert Jan Schaper <r schaper chello nl>
- Cc: gtkmm-list <gtkmm-list gnome org>
- Subject: Re: [gtkmm] Slots from non-Gtk subclasses.
- Date: Tue, 25 Feb 2003 10:39:06 -0500
>> classes that use the same base class. The classic "diamond" inheritance
>> tree shows what happens.
>> A A(1) A(2)
>> / \ \ /
>> B C B C
>> \ / \ /
>> D D
>>
>> If B & C didn't inherit virtually from A, then calling B::foo propagates
>> to A(1)::foo, while calling C::foo propagates to A(2)::foo. So then
>> you've got two base classes (B & C) whose ancestors (A(1) & A(2)) are
>> easily in inconsistent states. These bugs cause wierd behavior more
>> often than segfaults, and it's not always clear when debugging why
>> variables became inconsistent.
>
>A good compiler will catch this bug at compile time. I know gcc 3.2 catches
>the bug.
and i can promise you that gcc2.9X does not. make of this what you will.
--p
[
Date Prev][
Date Next] [
Thread Prev][
Thread Next]
[
Thread Index]
[
Date Index]
[
Author Index]