arr_des.cpp

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#delete #allocation #destructor #include #function #class

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本文介绍了一个C++示例程序，该程序定义了一个名为loc的类，用于演示如何使用自定义new和delete运算符来管理内存。loc类包含了经纬度属性，并实现了自定义的new和delete操作符以显示这些操作的过程。

name="google_ads_frame" marginwidth="0" marginheight="0" src="http://pagead2.googlesyndication.com/pagead/ads?client=ca-pub-5572165936844014&dt=1194442938015&lmt=1194190197&format=336x280_as&output=html&correlator=1194442937843&url=file%3A%2F%2F%2FC%3A%2FDocuments%2520and%2520Settings%2Flhh1%2F%E6%A1%8C%E9%9D%A2%2FCLanguage.htm&color_bg=FFFFFF&color_text=000000&color_link=000000&color_url=FFFFFF&color_border=FFFFFF&ad_type=text&ga_vid=583001034.1194442938&ga_sid=1194442938&ga_hid=1942779085&flash=9&u_h=768&u_w=1024&u_ah=740&u_aw=1024&u_cd=32&u_tz=480&u_java=true" frameborder="0" width="336" scrolling="no" height="280" allowtransparency="allowtransparency"> #include <iostream.h>
#include <stdlib.h>

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

loc::~loc(void)
{
cout << "In the destructor function" << endl;
}

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

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