Void Pointer in C++

Void Pointer:
The void type of pointer is a special type of pointer. In C++, void represents the absence of type,
so void pointers are pointers that point to a value that has no type (and thus also an undetermined
length and undetermined dereference properties).

This allows void pointers to point to any data type, from an integer value or a float to a string of
characters. But in exchange they have a great limitation: the data pointed by them cannot be
directly dereferenced (which is logical, since we have no type to dereference to), and for that
reason we will always have to cast the address in the void pointer to some other pointer type that
points to a concrete data type before dereferencing it.

One of its uses may be to pass generic parameters to a function:

For example:
int a = 10;

char b = 'x';

void *p = &a; // void pointer holds address of int 'a'
p = &b; // void pointer holds address of char 'b'


Problem Statement:

Write a program using void pointer.
#include <iostream>
using namespace std;
void increase(void* data, int psize) {
if (psize == sizeof(char)) {
char* pchar; pchar = (char*)data; ++(*pchar);
}
else if (psize == sizeof(int)) {
int* pint; pint = (int*)data; ++(*pint);
}
}
int main() {
char a = 'x';
int b = 1000;
increase(&a, sizeof(a));
increase(&b, sizeof(b));
cout << a << ", " << b << endl;