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完善0707.设计链表C++版本，在delete指针之后赋值为null，在注释中 说明了野指针问题

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dongyunpeng
2023-03-09 01:36:30 +08:00
parent 2e216c1bd7
commit 60d585f4ee
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problems/0707.设计链表.md
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@ -133,6 +133,11 @@ public:
LinkedNode* tmp = cur->next; LinkedNode* tmp = cur->next;
cur->next = cur->next->next; cur->next = cur->next->next;
delete tmp; delete tmp;
//delete命令指示释放了tmp指针原本所指的那部分内存，
//被delete后的指针tmp的值（地址）并非就是NULL，而是随机值。也就是被delete后，
//如果不再加上一句tmp=nullptr,tmp会成为乱指的野指针
//如果之后的程序不小心使用了tmp，会指向难以预想的内存空间
tmp=nullptr;
_size--; _size--;
} }
@ -1447,3 +1452,4 @@ impl MyLinkedList {
<a href="https://programmercarl.com/other/kstar.html" target="_blank"> <a href="https://programmercarl.com/other/kstar.html" target="_blank">
<img src="../pics/网站星球宣传海报.jpg" width="1000"/> <img src="../pics/网站星球宣传海报.jpg" width="1000"/>
</a> </a>