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If you have not done so, read this full tutorial on how to use SGEXTN to build an application.
Function pointers are used very extensively in SGEXTN as callback functions and replaces Qt's signal-slot mechanism.
A function pointer is a special pointer to the code of a function. It can be passed around like any other pointer and also be called like a function. Callback functions in SGEXTN refers to function pointers to static member functions of classes, and they must return void.
The arguments in a function are part of the type when a pointer to the function is created. Therefore you must match the arguments and return type when writing to a function pointer.
To make a function pointer, you literally make a function into a pointer using &.
#include <SGXDebug.h> // necessary for debug logging #include <SGXTimer.h> // for the timer void func(){ // a function SG("callback function called"); // log stuff } SGXTimer::singleCall(0.0f, &func); // &func is a function pointer to func
Function pointers are almost always exposed variables in SGEXTN and can be read from and written to directly. Modifying a function pointer property immediately changes the callback function being used. There is no need for connect or disconnect calls and no need for complicated MetaObject stuff that slow down compilation.
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