135 lines
2.5 KiB
C++
135 lines
2.5 KiB
C++
// Step 1: create the class loc.
|
||
|
||
// Step 2: Declare the constructor loc .which initialize the member variables.
|
||
|
||
// Step 3: Declare the delete and new operator functions with the keyword operator.
|
||
|
||
// Step 4: Define the user specified operator’s behavior in operator function definitions.
|
||
|
||
// Step 5: Create the objects for the class loc.
|
||
|
||
// Step 6: Use the user defined operators for objects.
|
||
|
||
// Step 7: Monitoring the output values.
|
||
|
||
#include <iostream.h>
|
||
#include <cstlib>
|
||
#include <new>
|
||
|
||
class loc
|
||
{
|
||
int longtitude,latitude;
|
||
public :
|
||
loc()
|
||
{
|
||
longtitude=latitude=0;
|
||
}
|
||
loc (int lg,int lt)
|
||
{
|
||
longtitude=lg;
|
||
latitude=lt;
|
||
}
|
||
void show()
|
||
{
|
||
cout<< logitude << " ";
|
||
cout<< latitude <<"\n";
|
||
}
|
||
|
||
void *operator new(size_t size);
|
||
void operator delete(void *p);
|
||
void *operator new[](size_t size);
|
||
void operator delete[](void *p);
|
||
};
|
||
|
||
// new overloaded relative to loc
|
||
|
||
void *loc :: operator new(size_t size)
|
||
{
|
||
void *p;
|
||
cout<<"In overloaded new.\n";
|
||
p=malloc(size);
|
||
if(!p)
|
||
{
|
||
bad_alloc ba;
|
||
throw ba;
|
||
}
|
||
return p;
|
||
}
|
||
|
||
void loc :: operator delete (void *p)
|
||
{
|
||
cout<< "In overloaded delete. \n";
|
||
free(p);
|
||
}
|
||
|
||
//new overloaded for loc arrays.
|
||
void *loc :: operator new[](size_t size)
|
||
{
|
||
void *p;
|
||
cout<<"Using overload new[].\n";
|
||
p=malloc(size);
|
||
if(!p)
|
||
{
|
||
bad_alloc ba;
|
||
throw ba;
|
||
}
|
||
return p;
|
||
}
|
||
|
||
//delete overloaded for loc arrays.
|
||
|
||
void loc :: operator delete[](void *p)
|
||
{
|
||
cout<<"Freeing array using overloaded delete[]\n";
|
||
free(p);
|
||
}
|
||
|
||
int main()
|
||
{
|
||
loc *p1,*p2;
|
||
int i;
|
||
try
|
||
{
|
||
p1=new loc(10,20); //allocate an object
|
||
}
|
||
catch (bad_alloc xa)
|
||
{
|
||
cout<<"Allocation error for p1.\n";
|
||
return 1;
|
||
}
|
||
try
|
||
{
|
||
p2=new loc[10];
|
||
}
|
||
catch(bad_alloc xa)
|
||
{
|
||
cout<<"Allocation error for p2 .\n";
|
||
return 1;
|
||
}
|
||
p1->show();
|
||
for(i=0; i<10; i++)
|
||
p2[i].show();
|
||
delete p1;
|
||
delete [] p2;
|
||
return 0;
|
||
}
|
||
|
||
// SAMPLE INPUT AND OUTPUT:
|
||
|
||
// In overloaded new
|
||
// Using overload new[].
|
||
|
||
// 10 20
|
||
// 0 0
|
||
// 0 0
|
||
// 0 0
|
||
// 0 0
|
||
// 0 0
|
||
// 0 0
|
||
// 0 0
|
||
// 0 0
|
||
// 0 0
|
||
// 0 0
|
||
// In overloaded delete.
|
||
// Freeing array using overloaded delete.
|