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8 changes: 6 additions & 2 deletions docs/notes/03-hunting_job/02-interview/01-01-01-basic.md
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Expand Up @@ -266,11 +266,15 @@ void main()

## 4、在传递函数参数时，什么时候该使用指针，什么时候该使用引用呢？

* 需要返回函数内局部变量的内存的时候用指针。使用指针传参需要开辟内存，用完要记得释放指针，不然会内存泄漏。而返回局部变量的引用是没有意义的
* 需要利用参数获取函数内部动态分配的内存时用指针。同时无论是指针还是引用，都不应该返回函数内局部变量的地址，因为局部变量在函数结束时会被销毁，返回后访问会导致未定义行为

* 当需要表示"可选"或"可能为空"的语义时，使用指针

* 对栈空间大小比较敏感（比如递归）的时候使用引用。使用引用传递不需要创建临时变量，开销要更小

* 类对象作为参数传递的时候使用引用，这是C++类对象传递的标准方式
* 类对象作为参数传递的时候使用引用，这样可以避免大对象的拷贝开销，同时要注意此时参数不能为空；如果对象不需要修改，则再加上const修饰

* 实现多态时的动态分配对象使用指针



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