struct and class problem

ofer4 · 06-15-2012, 06:41 PM

hi

i created a header file:

Code:

#ifndef _DeliveryVehicleList
#define _DeliveryVehicleList


typedef struct _List* Plist;
typedef struct _List List;


struct _List 
{
	Plist next;
	Plist prev;
	DeliveryVehicle* deliveryvehicle;
};

class vehicle_list
{
protected:
	Plist first_list;
public:
	vehicle_list();
	bool add_list(Plist plist);
	Plist get_first_list();
	Plist create_list(DeliveryVehicle* deliveryvehicle);
	~vehicle_list()

};


#endif // !_DeliveryVehicleList

and this is the cpp file:

Code:

#include <iostream>
#include "DeliveryVehicleList.H"
#include "Parcel.H"
#include "DeliveryVehicle.H"
#include "FastDeliveryVehicle.H"
#include "ProfessionalDeliveryVehicle.H"

using namespace std;



vehicle_list::vehicle_list()
{
	first_list=(Plist) new(List);
	first_list->next=NULL;
	first_list->prev=NULL;
	first_list->deliveryvehicle=NULL;
}

vehicle_list::~vehicle_list()
{
	delete first_list;
}

bool vehicle_list::add_list(Plist plist)
{
	Plist temp;
	plist->prev=NULL;
	plist->next=first_list;
	first_list->prev=plist;
	return EXIT_SUCCESS;
}

Plist vehicle_list::create_list(DeliveryVehicle* deliveryvehicle)
{
	Plist plist= (Plist)new(sizeof(List));
}

however visual studio show me an error message:

http://img13.imageshack.us/img13/1825/17971379.jpg

please someone can help me to resolve this issue?

i dont knwo what am i doing wrong...

thanks alot

Nylex · 06-16-2012, 01:25 AM

It looks like you're trying to use new how one would use malloc(), I think. You don't use new that way; you simply give your class constructor with any arguments. Since I guess you just want to use _List's default constructor (I believe structs in C++ are really classes, but with public members), you just give the class name:

Code:

Plist plist = new List;

I've not really looked at the rest of the code, so won't comment on it.

Also "alot" is really two words (see link in my sig).

Mara · 06-25-2012, 04:17 PM

I cannot see any constructor with size_t/int as parameter. Why won't you just write:

Code:

Plist plist= new List;