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