new 和 delete 用法

1、

这两个其实是 C++ 语言标准库的库函数，原型分别如下：

void *operator new(size_t);     //allocate an object
void *operator delete(void *);    //free an object

void *operator new[](size_t);     //allocate an array
void *operator delete[](void *);    //free an array

2、基本数据类型

int *p = new int;

delete p;

3、类

class *pA = new A(10);

delete pA;

4、动态数组

string *psa = new string[10];      //array of 10 empty strings
int *pia = new int[10];           //array of 10 uninitialized ints

delete [] psa;
delete [] pia;