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handle_example.cc
/************************************************************************/
/* */
/* Centre for Speech Technology Research */
/* University of Edinburgh, UK */
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/*************************************************************************/
/* */
/* Author: Richard Caley (rjc@cstr.ed.ac.uk) */
/* Date: Wed Mar 18 1998 */
/* */
/* -------------------------------------------------------------------- */
/* Example of using the THandle reference counted pointer type. */
/* */
/*************************************************************************/
#include <cstdlib>
#include <fstream>
#include <iostream>
#include "EST_Handleable.h"
#include "EST_THandle.h"
#include "EST_TBox.h"
#include "EST_String.h"
/**@name EST_THandle:example
*
* Example of using the THandle reference counted pointer type.
*
* @see EST_THandle
*/
//@{
/** A simple object which can be handled and reference counted.
*/
class HandleableThing : public EST_Handleable
{
private:
EST_String p_name;
public:
HandleableThing(EST_String name)
{
p_name=name;
start_refcounting();
cout << "[create-" << name << "]\n";
}
~HandleableThing(void)
{ cout << "[destroy-" << p_name << "]\n"; }
EST_String name(void) const { return p_name; }
friend ostream& operator << (ostream &st, const HandleableThing &t);
HandleableThing *object_ptr() { return this; }
const HandleableThing *object_ptr() const { return this; }
};
ostream &operator << (ostream &st, const HandleableThing &t)
{
return st << "<<" << (const char *)t.name() << "/" << t.refcount() << ">>";
}
typedef EST_THandle<HandleableThing,HandleableThing> HandleableThingP; // decl
/** A simple object which doesn't understand reference counting.
*/
class Thing
{
private:
EST_String p_name;
public:
Thing(EST_String name)
{
p_name=name;
cout << "[create-" << name << "]\n";
}
~Thing(void)
{ cout << "[destroy-" << p_name << "]\n"; }
EST_String name(void) const { return p_name; }
friend ostream& operator << (ostream &st, const EST_TBox<Thing> &t);
friend ostream& operator << (ostream &st, const Thing &t);
Thing *object_ptr() { return this; }
const Thing *object_ptr() const { return this; }
};
ostream &operator << (ostream &st, const EST_TBox<Thing> &t)
{
return st << "<<[[" << t.c()->name() << "/" << t.refcount() << "]]>>";
}
ostream &operator << (ostream &st, const Thing &t)
{
return st << "{" << t.name() << "}";
}
typedef EST_TBox<Thing> BoxedThing; // decl
typedef EST_THandle<BoxedThing,Thing> BoxedThingP; // decl
void unboxed(void)
{
cout << "\n\nUnboxed Examples\n";
HandleableThingP pa;
HandleableThingP pb;
pa = new HandleableThing("apple");
pb = new HandleableThing("banana");
HandleableThingP pc = new HandleableThing("cherry");
cout << *pa
<< " " << *pb
<< "\n";
pc=pa;
cout << *pa
<< " " << *pb
<< "\n";
pc = pb;
cout << *pa
<< " " << *pb
<< "\n";
pa = NULL;
cout << "NULL"
<< " " << *pb
<< "\n";
pa = new HandleableThing("pie");
cout << *pa
<< " " << *pb
<< "\n";
pb = new HandleableThing("split");
pc = new HandleableThing("cheesecake");
cout << *pa
<< " " << *pb
<< "\n";
}
void boxed(void)
{
cout << "\n\nBoxed Examples\n";
BoxedThingP pa;
BoxedThingP pb;
pa = new BoxedThing(new Thing("aubergene"));
pb = new BoxedThing(new Thing("brocoli"));
BoxedThingP pc = new BoxedThing(new Thing("cauliflower"));
cout << *pa
<< " " << *pb
<< "\n";
pc=pa;
cout << *pa
<< " " << *pb
<< "\n";
pc = pb;
cout << *pa
<< " " << *pb
<< "\n";
pa = NULL;
cout << "NULL"
<< " " << *pb
<< "\n";
pa = new BoxedThing(new Thing("pate"));
cout << *pa
<< " " << *pb
<< "\n";
pb = new BoxedThing(new Thing("quiche"));
pc = new BoxedThing(new Thing("cheese"));
cout << *pa
<< " " << *pb
<< "\n";
}
int main(void)
{
unboxed();
boxed();
exit(0);
}
#ifdef INSTANTIATE_TEMPLATES
template class EST_THandle<HandleableThing,HandleableThing>;
template class EST_THandle<BoxedThing,Thing>;
template class EST_TBox<Thing>;
#endif
//@}
EST_Handleable
Definition EST_Handleable.h:55
EST_TBox
Definition EST_TBox.h:49