[Qt-interest] qobject_cast Vs dynamic_cast

[Ramesh]

There is a brief info about how signal slot are work is given here

http://tokoe-kde.blogspot.com/2010/06/verktyg-or-how-to-tame-signals-and.htm
l





From: qt-interest-bounces at trolltech.com
[mailto:qt-interest-bounces at trolltech.com] On Behalf Of ??
Sent: Thursday, October 21, 2010 12:36 PM
To: Sarvesh Saran; qt-interest at trolltech.com
Subject: Re: [Qt-interest] qobject_cast Vs dynamic_cast



In my opinion, the best way to understand the implementation signals and
slots is to read source code. You can check the marco SIGNALS and SLOTS. The
SIGNALS makes function name to a string. I found Qt maintains a SIGNAL-SLOT
map. In fact, when Qt found an emit keyword, it will change it to the slot
function.

2010/10/21 Sarvesh Saran <Sarvesh.Saran at synopsys.com>

Hi All,



I am trying to understand the differences between the qobject_cast  and
dynamic_cast and the advantages offered by qobject_cast.



According to QT documentation:



The qobject_cast() function behaves similarly to the standard C++
dynamic_cast(), with the advantages that it doesn't require RTTI support and
it works across dynamic library boundaries.



Can someone explain the meaning of the underlined words “it works across
dynamic library boundaries” ?



I have another question,  related to signals and slots. I will appreciate it
if someone can give a conceptual overview of how QT implements signals and
slots internally?  ( the documentation says that we don’t use templates as
certain compilers do not support  advanced templates ). I was just curious
how signals and slots work under the hood.



Thanks!

Sarvesh






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