动态分配的标准写法(new, delete; malloc, free)
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1、可能有的人涉及到动态分配只用到下面的这句:
#include <iostream>using namespace std;int main(void){int *p;p = new int(1);//1cout << *p << endl;int *q;q = (int *)malloc(sizeof(int));*q = 1;cout << *q << endl;return 0;}
漏洞百出,不想多说。
(补充一句,上面用的是new的plain new用法)
2、自己总结了一下动态分配的写法(当然还有其他写法),以后就这么写了:
#include <iostream>using namespace std;int main(void){int *p = NULL;p = new(nothrow) int(1);//1if (p == NULL) {//2cerr << "Allocate failed!" << endl;exit(OVERFLOW);}cout << *p << endl;delete p;//3p = NULL;//4/*----------------------------------------------------*/int *q = NULL;q = (int *)malloc(sizeof(int));//1if (q == NULL) {//2cerr << "Allocate failed!" << endl;exit(OVERFLOW);}*q = 1;cout << *q << endl;free(q);//3q = NULL;//4return 0;}
扩展阅读:林锐
http://blog.sina.com.cn/s/blog_446b43c10100d7ci.html
2012/8/10
p= new (nothrow) int[i];if (p == 0) cout << "Error: memory could not be allocated";
http://www.cplusplus.com/doc/tutorial/dynamic/
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