C overloading

#include <stdio.h>

///////////////////////////////////////
// Base

typedef struct _base
{
   char*(*GetName)(struct _base*);
   char* name;
} Base;

char* base_get_name(Base* base)
{
   return base->name;
}

void base_init(Base* base, char* name)
{
   base->name = name;
   base->GetName = &base_get_name;
}

///////////////////////////////////////
// Derived

typedef struct
{
   Base Base;
} Derived;

char* derived_get_name(Base* derived)
{
   return "derived";
}

void derived_init(Derived* derived)
{
   derived->Base.name = "";
   derived->Base.GetName = &derived_get_name;
}

//////////////////////////////////////
// Functions

void PrintName(Base* base)
{
   printf("%s\n", base->GetName(base));
}

int main()
{
   Base b;
   Base* bPtr = &b;
   base_init(bPtr, "base");
   PrintName(bPtr);

   Derived d;
   Derived* dPtr = &d;
   derived_init(dPtr);

   PrintName((Base*)(dPtr));

   return 0;
}

// output:
// base
// derived