Understanding of deep copies and shallow copies

1. The two copies are used primarily for copying between objects!

2. Differences

No pointers:

Deep copy and shallow copy are no different;

With pointers:

Shallow copy: That is, the default copy function of the object, just copy the address of the pointer to the object, two variables point to an address at the same time, so when the destruction of the process will inevitably lead to the program crash;

1 classA2 {3  Public:4 A ()5     {6M_data =New Char[ -];7     }8~A ()9     {Ten         Delete[]m_data; OneM_data =NULL; A     } -  - protected: the Private: -     Char*m_data; - }; -  + int_tmain (intARGC, _tchar*argv[]) - { + A; A a B (a); at  -     return 0; - 

Deep copy: That is, to customize the copy function, save the pointer new section of memory, so that the destruction will not collapse;

　　

Understanding of deep copies and shallow copies