《Cracking the Coding Interview》——第13章：C和C++——题目4

2014-04-25 19:50

题目：深拷贝和浅拷贝有什么区别？如何应用？

解法：深拷贝传值，浅拷贝传引用。java里对此做了限制，而C++里面用起来更自由。大结构不宜传值，因为拷贝过程效率低。

代码：

 // 13.4 What's deep copy and shallow copy? Expain their appications in different cases.
 // Answer:
 //    deep copy:
 //        1. pass by value, often used on small data type, built-in data types.
 //        2. data is usually persistent, can be seriailzed directly.
 //        3. the data to be deep-copied usually represents objects and entities.
 //    shallow copy:
 //        1. pass by reference or pointer, often used on large struct or class.
 //        2. data is volatile, serialization must be done with the help of persistent data type.
 //        3. the data to be shallow-copied usually represents relations and mappings between entities.
 int main()
 {
     return ;
 }