в 14:21, 25 мая 2010

2010-05-25T14:21:17Z

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2010-05-25T10:30:37Z

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==Overloaded "delete" operator relative to Pointer==

<source lang="cpp">#include <iostream>
#include <cstdlib>
#include <new>
using namespace std;
class Point {
int x, y;
public:
Point() {}
Point(int px, int py) {
x = px;
y = py;
}
void show() {
cout << x << " ";
cout << y << "\n";
}
void *operator new(size_t size);
void operator delete(void *p);
};
// new overloaded relative to Point.
void *Point::operator new(size_t size)
{
void *p;
cout << "In overloaded new.\n";
p = malloc(size);
if(!p) {
bad_alloc ba;
throw ba;
}
return p;
}
// delete overloaded relative to Point.
void Point::operator delete(void *p)
{
cout << "In overloaded delete.\n";
free(p);
}
int main()
{
Point *p1, *p2;
try {
p1 = new Point (10, 20);
} catch (bad_alloc xa) {
cout << "Allocation error for p1.\n";
return 1;
}
try {
p2 = new Point (-10, -20);
} catch (bad_alloc xa) {
cout << "Allocation error for p2.\n";
return 1;;
}
p1->show();
p2->show();
delete p1;
delete p2;
return 0;
}</source>
<pre class=codeResult>In overloaded new.
In overloaded new.
10 20
-10 -20
In overloaded delete.
In overloaded delete.</pre>

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в 14:21, 25 мая 2010

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