placement2.cpp
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#include <new>
#include <string>
#include <iostream>
using namespace std;
class Arena
{
public:
virtual void *alloc (size_t s)
{
return malloc (s);
};
virtual void free (void *s)
{
::free (s);
};
};
class object
{
public:
object ()
{
throw 0;
}
};
void *operator
new (size_t sz, Arena * a)
{
return a->alloc (sz);
}
void operator
delete (void *s, Arena * a)
{
a->free (s);
cout << "operator delete called" << endl;
}
int
main ()
{
Arena a;
try
{
string *s = new (&a) string ("s");
object *o = new (&a) object;
s->~string ();
o->~object ();
a.free (s);
a.free (o);
}
catch(int)
{
cout << "Exception of type int caught"<<endl;
}
}