C ++ function pointer

1. function pointer Definition

INT (* FP) (int A); // defines a pointer to the function.

Int * FP (int A); // error. This is a function that returns an integer pointer instead of a function pointer.

Int _ tmain (INT argc, _ tchar * argv []) {/////////////////////////////////////// /// // example1cout <functestmethod <<Endl; // output function address int (* fptr) (int I); // defines the function pointer fptr = functestmethod ;//; // assign the address of the function functestmethod to the function pointer fptrcout <fptr (5) <"|" <(* fptr) (15) <Endl; // output FP (5) above, which is written in the Standard C ++. (* FP) (15) This is a standard writing method compatible with C. The two methods agree, but note the difference, avoid writing programs with portability issues! //////////////////////////////////////// /// // Example2cout <functestmethod <endl; // output function address: typedefint (* fptr) (int I); // defines the function pointer type. The type is fptr. Typedef definition can simplify the definition of function pointer fptr F; // use the type name fptr defined by yourself to define a function pointer of F! F = functestmethod; // assign the address of the function functestmethod to the function pointer fptrcout <fptr (5) <"|" <(* fptr) (15) <Endl; // output FP (5) above. This is the standard C ++ writing method. (* FP) (15) This is a standard writing method compatible with C language, however, be sure to differentiate to avoid portability issues for written programs! Return 0;} int functestmethod (int I) {return I ;}

　　

2. The function pointed to by the function pointer must be a global function or a static function of the class.

class FuncPtr{typedef int (*func)(void);public:void FuncPtrTet(func func1){(*func1)();};static int display(void){cout <<"display"<<endl;return 0;}};

　　

int display2(void){cout <<"display2"<<endl;return 2;}

Implementation

int _tmain(int argc, _TCHAR* argv[]){FuncPtr f;f.FuncPtrTet(FuncPtr::display);f.FuncPtrTet(display2);return 0;}