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POIs there a lightweight signal-slot implementation with basic reflection?
 

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  1. POIs there a lightweight signal-slot implementation with basic reflection?
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    <p><strong>Background</strong></p> <p>I need to implement a dynamically-configurable data-processing toolkit. There will be several data processing entities, which can be combined to a data-flow graph by using a GUI tool. The idea is similiar to Direct Show filter graphs (GraphEdit) or Apple's Quartz Composer.</p> <p>The GUI tool will store graph definitions in a file. When the actual processing is started, this definition file will be read, and data processing objects have to be created and connected at runtime.</p> <p>I have used Qt's signals and slots for similiar problems before, but this time the main program does not have any GUI. So I'd like to use something less bloated.</p> <p><strong>Question</strong></p> <p>What is the easiest way to have signal/slot functionality with basic reflection, without using Qt?</p> <p>I need to define a fixed number of slot types (each with a certain predefined function signature). For example, there will be an image-consuming slot, taking an image object as parameter, or a slot just taking an int as parameter.</p> <p>At runtime, I need to iterate through all signals/slots and connect them dynamically.</p> <p>I do not need to inspect Slot/Signal Parameters at runtime. It sufficient to have a fixed number of parameter sets. It would be ok to put some kind of hint in the slot's name to identify the signature type.</p> <p>I know that boost ships with signal2, which provides signal/slot functionality. But whats the fastest way to implement reflection? Should I build my own set of macro-hacks?</p>
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    1. COYou are aware that Qt's signals and slots are in [QtCore](http://developer.qt.nokia.com/doc/qt-4.8/qtcore.html) **not** in [QtGui](http://developer.qt.nokia.com/doc/qt-4.8/qtgui.html) and therefore do not need to `#include` or link to the GUI libraries at all, yes?
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      1. USSamuel Harmer
 

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