Re: casting on 64/32-bit environment

["Mitja Ursic" <mitja dot ursic at email dot si>]

On Fri, 12 Oct 2007 at 15:46:14, Andrew Haley wrote:
> The problem here is that we don't know what you don't understand.
> 
> If you're casting a pointer to an (32-bit) int, then if you are on a
> 64-bit system, there will be overflow and some information will be
> lost.  If you're on a 32-bit system then there won't be a problem.
> This seems obvious: what's the problem?
> 
> Andrew.

Sorry for very late replay. My OS is 64 bit (Linux Red Hat 4 WS, Update 4, 64-
bit). I want to compile a program in 64-bit environment but due to casting I 
don't trust to the compiled program. So I want to figure out which steps are 
necessary to take and than to compiled program on 64-bit without casting 
warnings. So if you have any advice what to do I would be happy. Perhapse a 
part of a code would help to figure out what is the cause of my problems.

So, this is my casting warning:
func.cc: In function `void func()': func.cc:105: warning: cast to pointer from 
integer of different size
PtrF.h: In constructor `PtrF<Element>::PtrF(Element*) [with Element = el]': 
func.cc:105:   instantiated from here PtrF.h:39: warning: cast from pointer to 
integer of different size

Down I give a part of a code:

//FUNC.CC
void func ()
{
   â
   int iel=0;
   â
   PtrF <EL> el01 = (EL*) iel; 	//line 105
â
}

//PTRF.H
template <class Element> 
class PtrF : public PtrC<Element>
{
public:
   â
   //constructor at line 39
   PtrF(Element* ele):Ptr<Element>(ele),_vide((int)ele) {}
   â
private :
   int _vide;
};

//CLASS PTR
template <class Element> 
class Ptr : public Obj
{
public:
   â
   //constructor
   Ptr(Element *pointerEl = 0):_impP(new ImpP<Element>(pointerEl)){} 
   â

protected:
   ImpP<Element> *_impP;  
};

//CLASS IMPP
template <class Element> class ImpP
{
â
private:
   Element* _ptr;
   â
   //constructor 
   ImpP(Element * element = 0):_ptr(element) {}
} ;

//EL CLASS
class EL : public Obj
{
â
public :
   // constructor
   EL(int vi,int vj, int vk):i(vi),j(vj),k(vk) {}
   â
   int i,j,k;
   â
};

Mitja

____________________
http://www.email.si/