#include <vcl>
#include <iostream>
#include <list>
#pragma hdrstop
using namespace std;
class A {
int x, y; A *p;
public:
A(int xx, int yy, A *p);
A(int xx = -1, int yy = -1) :
x(xx), y(yy), p(0) {}
A& operator =(const A&);
A operator +(const A&);
bool operator ==(const A&);
void show();
A get_p_value() const { return *p; }
};
void A::show() {
if (p != 0)
cout << x << " " << y << " Right was: " << p->x << " " << p->y << endl;
else
cout << x << " " << y << " Right was: unknown" << endl;
}
A::A(int xx, int yy, A *pp) {
x = xx;
y = yy;
p = pp;
}
A& A::operator =(const A& right) {
if (this != &right) {
p = right.p;
x = right.x;
y = right.y;
}
return *this;
}
A A::operator +(const A &right) {
return A(x + right.x, y + right.y, const_cast<A*>(&right));
}
bool A::operator ==(const A &right) {
return x == right.x && y == right.y && p == right.p;
}
#pragma argsused // No warning if function args are not in use.
// But there is no warning while compiling project. Why?
int _tmain(int argc, _TCHAR* argv[]) {
list<A> lst = list<A>();
A a1 = A(10, 10), a2(5, 7), a3;
lst.push_back(a1);
lst.push_back(a2);
cout << "List before processing" << endl;
for (list<A>::iterator it = lst.begin(); it != lst.end(); it++)
it->show();
a3 = a1 + a2;
lst.remove(a3.get_p_value());
cout << endl << "List after processing" << endl;
for (list<A>::iterator it = lst.begin(); it != lst.end(); it++)
it->show();
system("pause");
} |
