Understanding of deep copy and light copy

Understanding of deep copy and light copy

1. The two copies are mainly used for copying objects!

2. Differences

No pointer:

There is no difference between deep copy and light copy;

Pointer:

Shallow copy: the default copy function of the object. It only copies the pointer address to the object, and the two variables point to the same address at the same time. This will inevitably lead to program crash during the analysis;

1 class A 2 {3 public: 4 A () 5 {6 m_Data = new char [100]; 7} 8 ~ A () 9 {10 delete [] m_Data; 11 m_Data = NULL; 12} 13 14 protected: 15 private: 16 char * m_Data; 17 }; 18 19 int _ tmain (int argc, _ TCHAR * argv []) 20 {21 A; 22 a B (A); 23 24 return 0; 25

Deep copy: You need to customize the copy function and save the pointer to a new memory segment. In this way, the structure will not crash;