深度剖析new/delete & new[]/delete[]

最新推荐文章于 2025-12-01 21:11:34 发布

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本文通过代码实例演示了new/delete及new[]/delete[]的操作过程，包括动态内存分配与释放的基本用法，展示了构造函数与析构函数的调用时机。

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;
}