问题描述
我做了这个构造函数,我需要做一个深的副本。我真的不明白一个深的副本的意思。我知道它使一个对象的独立副本有自己的动态内存,但我不明白这是需要什么。我也不知道如何实际实现深拷贝。任何建议?
I made this constructor, and I need to make a deep copy of it. I don't really understand the meaning of a deep copy. I know it makes independent copy of an object that has its own dynamic memory, but I don't understand what the need is for this. I'm also not sure how to actually implement the deep copy. Any suggestions?
这里是我的构造函数,我需要做的深拷贝:
任何人都可以提供一些语法帮助,像一个骨架?
Here is my constructor that I need to make deep copy of:Could anyone provide some syntax help, like a skeleton?
template<class t_type>
inline ALIST<t_type>::ALIST()
{
t_type value;
capacity=10;
DB = new t_type[capacity];
count=capacity;
cout<<"Enter value: ";
cin.clear();
cin>>value;
for(int i=0; i<capacity; i++)
{
DB[i]=value;
}
}
推荐答案
a href =http://stackoverflow.com/questions/3279543/what-is-the-copy-and-swap-idiom>什么是复制和交换惯用语?
What is the copy-and-swap idiom?
使用深度副本,以便您可以复制对象具有的所有信息,然后更改副本而不更改原始副本。一般来说,浅拷贝只会复制指针本身,但仍指向相同的信息。如果您不小心,这可能会导致数据发生意外更改。
Deep copies are used so that you can copy all the information that an object has, and then alter the copy without altering the original. Broadly speaking, a shallow copy will copy only the pointer itself, but still point to the same information. This can lead to unexpected changes in data if you're not careful.
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