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How to use pointers to functions in c++ for passing functions as arguments to other functions. It covers the syntax for declaring, initializing, and invoking function pointers, as well as the benefits of using function pointers for passing around instructions and creating flexible functions and libraries. Examples are provided for pointers to functions with no parameters and pointers to functions with parameters.
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void one() { cout << "One \n "; } void two() { cout << "Two \n "; } int main() { void (*fptr)(); //Declare a function pointer to voids with no params
fptr = &one; //fptr - > one *fptr(); //=> one() fptr = &two; //fptr - > two *fptr(); //=> two() return 0 ; }
void one() { cout << "One \n "; } void two() { cout << "Two \n "; } int main() { void (*fptr)(); //Declare a function pointer to voids with no params fptr = one; //fptr - > one fptr(); //=> one() fptr = two; //fptr - > two fptr(); //=> two() return 0 ; }
void one(int a, int b) { cout << a+b << " \n "; } void two(int a, int b) { cout << a*b << " \n "; }