AngelScript function pointers now working

Andreas Jonsson · 2010-02-27T16:51:37

Hi guys, I'd just wanted to let you know that I've finally been able to get to the point where function pointers are now fully working. I welcome those that have been waiting for this feature to give it a try so I can root out as many bugs as possible before I release version 2.18.2. Here's a script example that shows the syntax for the function pointers: // Define a function signature for the function pointer funcdef bool CALLBACK(int, int); // An example function that to use this void main() { // Declare a function pointer, and set it // to point to the myCompare function. CALLBACK @func = @myCompare; // The function pointer can be compared with the 'is' operator if( func is null ) { print("The function pointer is null\n"); return; } // Call the function through the pointer, just as if it was a normal function if( func(1, 2) ) { print("The function returned true\n"); } else { print("The function returned false\n"); } } // This function matches the CALLBACK definition, since it has // the same return type and parameter types. bool myCompare(int a, int b) { return a > b; } One disclaimer though, while the function pointers are now fully working, they are still a bit limited in their usefulness as there is still no way for the application to define the function definitions, this means that the function pointers can really only be used within scripts, but not be passed to or from the application. This is a limitation that I'll address with version 2.19, when I'll update the application interface. There are also some other limitations that I plan on improving over the coming releases. For example, the addition of a generic function pointer type that can hold any function pointer, regardless of signature, and the addition of reference casts for this generic type to the real function pointer type. This will make it much more versatile. Regards, Andreas

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Started by WitchLord February 22, 2010 06:34 PM

10 comments, last by WitchLord 14 years, 9 months ago

WitchLord

Author

4,860

February 26, 2010 08:15 PM

Are you deliberately trying to destroy my morale? ;)

Just kidding. I'll look into both of these problems.

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WitchLord

Author

4,860

February 27, 2010 04:51 PM

This bug should have been fixed in revision 565.

As you suspected, it was not related to function pointers. It was a bug in the virtual machine. When dynamically growing the stack space, the object pointer for the class method call wasn't copied over to the new stack block, which caused the access violation.

AngelCode.com - game development and more - Reference DB - game developer references
AngelScript - free scripting library - BMFont - free bitmap font generator - Tower - free puzzle game

AngelScript function pointers now working

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