深度剖析new/delete & new[]/delete[]

new/delete & new[]/delete[]

代码测试 new/delete & new[]/delete[]到底在执行过程中做了些啥

#include <iostream>

using namespace std;

class Array

{

public:

       Array(size_t size = 10) :_size(size), _a(0)

       {

              cout << "Array()" << endl;

              if (_size > 0)

              {

                     _a = new int[size];

              }

       }

       ~Array()

       {

              cout << "~Array()" << endl;

              if (_a)

              {

                     delete[] _a;

                     _a = 0;

                     _size = 0;

              }

       }

private:

       int* _a;

       size_t _size;

};

int main()

{

       //调用相应的构造和析构函数

       int* p1 = new int;

       delete p1;

       //调用造函数和析构函数

       Array* p2 = new Array;

       delete p2;

       int* p3 = new int[10];

       delete[] p3;

       //调用十次构造函数

       Array* p4 = new Array[10];

       //调用十次析构函数

       delete[] p4;

       system("pause");

       return 0;

}

运行结果：