I am in the process of porting the file rc_actor.c to rc_actor.cpp for the game Rise of the Triad (see my progress page). I had forgotten how flexible (or loose) C is compared to C++.

The difference in type checking between C and C++ can be maddening when porting simple function pointers:

In C, you can declare a function pointer as:

void (think *) (void *);

and

void gettarget(objtype *);

You can then assign:

think = gettarget;

In C++, you must declare gettarget as

void gettarget(void * tob)
{
    // Must assign ob to tob
     // tob is the void*, cast to objtype*
     objtype * ob = tob;
....
}

If you do not, then you will see the following error: 

error C2440: '=' : cannot convert from 'void (__cdecl *)(void *)' to 'void (__cdecl *)(objtype *)'

Converting the function calls, and handling any code changes neccessary for casting void* to objtype* is very tedious. I'm down to about 75 errors in my work with rt_actor.cpp. I certainly hope it all works after I complete the port. Surprised