cus_arr.cpp

不错书对C++/C程序员很有用的大家不要错过.

#include <iostream.h>
#include <stdlib.h>

class loc 
{
  int longitude, latitude;
  public:
    loc(void) {}                //  Used to construct temporaries
    loc (int lg, int lt)
      {
      longitude = lg;
      latitude = lt;
      }

    void show(void)
      {
      cout << longitude << " ";
      cout << latitude << endl;
      }

    void *operator new(size_t size);
    void operator delete(void *p);
    void *operator new[](size_t size);
    void operator delete[](void *p);
 };

void *loc::operator new(size_t size)
 {
	cout << "In the custom new function." << endl;
	return malloc(size);
 }

void loc::operator delete(void *p)
 {
	cout << "In the custom delete function." << endl;
	free(p);
 }

void *loc::operator new[](size_t size)
 {
	cout << "In the custom new ARRAY allocator function." << endl;
	return malloc(size);
 }

void loc::operator delete[](void *p)
 {
	cout << "Freeing the ARRAY in the custom delete function." << endl;
	free(p);
 }

void main(void)
  {
  loc *p1, *p2;
  int i;

  p1 = new loc(10,20);
  if (!p1)
	{
  		cout << "Allocation error\n";
  		exit(1);
  	}

  p2 = new loc[10];
  if (!p2)
  	{
   	cout << "Allocation error\n";
      exit(1);
   }
  p1->show();
  for(i=0; i<10; i++)
  	 p2[i].show();
  delete p1;
  delete [] p2;
 }