This is a simple C++ callback library. It's conceptually similar to FastDelegate, Qt, and countless other "typesafe callbacks in C++" articles across the web.

This library was developed with a primary goal of having an extremely simple, clean API. Secondary goals include low memory (low template bloat), zero external dependencies, and a high level of portability.

Using the library is incredibly simple. First, add the files to your project, Makefile, IDE, etc. Then, to use the library, simply include "signal.h".

Here's a simple example:

#include "signal.h"

void beep() { /* make speaker beep */ }

void flash() { /* make screen flash */ }

int main(int arg, char** argv)
{
	// create a signal which we'll emit any time a button is pressed
	signal<void> button_pressed;

	// connect (i.e. subscribe) functions to the signal
	button_pressed.connect(&beep);
	button_pressed.connect(&flash);

	// main loop, check for button press, and call signal
	while ( true )
	{
		if ( is_button_pressed() )
		{
			// call signal, which in turn calls all slot functionss (i.e. subscribers)
			button_pressed();
		}
	}
}

• better documentation
• consistent code cleanup
• generate.rb creates a single header file
• add License clause to source and LICENSE file