测试代码
#include <iostream>
using namespace std;
void test()
{
int *p;
p = new int;
*p = 5;
cout <<" *p = " <<*p <<endl;
cout <<" p = " <<p <<endl;
cout <<" &p = " <<&p <<endl;
delete p;
cout << "after delete" <<endl;
cout << " *p = " <<*p <<endl;
cout << " p = " <<p <<endl;
cout << " &p = " <<&p <<endl;
}
int main(int argc, char *argv[])
{
test();
return 0;
}
测试结果
结论
从运行结果上看,delete p;这个操作并没有改变p的指向,也没有改变p指向的内容,应该是向操作系统表明一个消息: p指向的这片内存操作系统可以回收了。