#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 = 'a';
  int b = 2;
  increase(&a,sizeof(a));
  increase(&b,sizeof(b));
  cout << a << ", " << b << endl;
  return 0;
}