Signals And Slots Vs Observer

24-05-2021

Signals And Slots Vs Observer

Signals And Slots Observer
Signals And Slots Vs Observer Game
C++ Signals And Slots Vs Observer
Signals And Slots Vs Observer Live

Aug 23, 2017 Why are signals and slots better than plain old callbacks? Because signals are a lot like plain old callbacks, on top of having extra features and being deeply integrated with Qt APIs. It ain't rocket science - callbacks + extra features + deep integration is greater than callbacks alone.

Library to use the observer pattern in C++11 programs withobservable/observer classes or signals/slots.

Features

Generate an observable notification/signal from multiple threads
Add/remove observers/slots from multiple threads
Erase/disconnect an observer/slot from the same observable notification/signal
Reconnect an observer in the same notification

Observable

Signals And Slots Observer

An observable Widget:

An example

Signal

Tested Compilers

Visual Studio 2015
Xcode 7.3.1 (-std=c++11)
GCC 4.8.4 (-std=c++11)

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This article was nominated for deletion on 3 June 2007. The result of the discussion was invalid.

Signals and slots, Observer pattern and Signal programming cover very similar topics. Maybe we should merge some of them. What do y'all think? Chronist 14:46, 7 October 2005 (UTC)

this is just the observer pattern[edit]

AfD Wikidrone 22:34, 2 June 2007 (UTC)

Signal slot mechanism isn't introduced with Qt, you should cite a precise source for this.

Anyway these are examples of C++ applications that uses the mechanism since 1992http://portal.acm.org/citation.cfm?id=1125087&dl=GUIDE&coll=GUIDE&CFID=42502829&CFTOKEN=12543122

or 2004http://portal.acm.org/citation.cfm?id=192500&dl=GUIDE&coll=GUIDE&CFID=42502829&CFTOKEN=12543122

Previous work can also exist, but I have only found these as a part of the state-of-the-art of my project.

Really a stub?[edit]

This article is marked as stub but looks decently good to me. It's not that we want to create a manual of programming, I guess.--Qgil (talk) 15:53, 15 April 2011 (UTC)

'No common implementation in plain C'[edit]

GLib seems pretty commonly used to me...

Shouldn't this page also discuss advantages and inconveniences of signal/slot vs callback mechanism?[edit]

if a signal is misspelled, there won't be any warning, and nothing will happen at runtime. possibly a warning will be issued to indicate that a slot was not found.
callbacks explicitly indicate who is interacting. for example, a (C++) class could declare an interface (e.g. inner class) that it expects its callees implement. This enforces that all necessary callbacks are effectively implemented (otherwise the compiler or linker will complain about missing code).
signals/slots allow for an arbitrary set of connections — Preceding unsigned comment added by Axd (talk • contribs) 09:01, 1 August 2012 (UTC)