подскажите пожалуйста как дописать удаление из списка
| C++ |
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| #include "stdafx.h"
#include <iostream>
#include <string>
using namespace std;
class Base;
class ListObjects;
class ListObjects
{
public:
ListObjects();
~ListObjects();
struct BasePlace {
Base *value;
BasePlace *next;
};
static BasePlace *top;
static void print();
private:
};
ListObjects::BasePlace* ListObjects::top = 0;
class Base
{
protected:
string name;
public:
Base(string name)
{
this->name = name;
}
virtual ~Base()
{
while (this)
{
name=this->name;
delete this;
}
//me='\0';
};
virtual void show()
{
cout << name << endl;
}
void Add();
};
void ListObjects::print() //вывод списка
{
ListObjects::BasePlace* cur = ListObjects::top;
Base* value;
while (cur)
{
//{
//cout<<"32"<<endl;
cout<<"23"<<endl;
value = cur->value;
if (cur==0)
cout<<"пусто"<<endl;
break;
value->show();
cur = cur->next;
}
//if (cur=0)
//cout<<"32"<<endl;
}
void Base::Add()
{//Добавление ы пустой список
ListObjects::BasePlace* el = new ListObjects::BasePlace;
el->value = this;
if (!ListObjects::top)
{
el->next = 0;
ListObjects::top = el;
}
else//в непустой
{
el->next = ListObjects::top;
ListObjects::top = el;
}
}
// Класс Place
class Place : public Base
{
public:
Place(string name) :Base(name) {};
void show() {
cout << name << " is a place" << endl;
}
~Place() {
name='\0';
cout << "delete Place object" << endl;
}
};
// Класс Region
class Region : public Base
{
public:
Region(string name) :Base(name) {};
void show() {
cout << this->name << " is a region" << endl;
}
~Region() {
name='\0';
cout << "delete Region object" << endl;
}
};
// Класс City
class City :public Base
{
public:
City(string name) :Base(name) {};
void show() {
cout << this->name << " is a city" << endl;
}
~City()
{
name='\0';
cout << "delete City object" << endl;
}
};
// Класс Megapolis
class Megapolis : public Base
{
public:
Megapolis(string name) :Base(name) {}
void show() {
cout <<'\n'<< this->name << " is a megalopolis" << endl;
}
~Megapolis()
{
name='\0';
cout << "delete Megapolis object" << endl;
}
};
int main()
{
string s;
cout<<"Enter Place:"<<endl;
cin>>s;
Place *p = new Place(s);
cout<<"Enter City:"<<endl;
cin>>s;
City *c = new City(s);
cout<<"Enter Region:"<<endl;
cin>>s;
Region *r = new Region(s);
cout<<"Enter Megapolis:"<<endl;
cin>>s;
Megapolis *m = new Megapolis(s);
p->Add();
c->Add();
r->Add();
m->Add();
ListObjects::print();
delete p;
delete c;
delete r;
delete m;
ListObjects::print();
system("pause");
return 0;
} |
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