Home > DeveloperSection > Interviews > Difference between shallow copy and deep copy?

Posted on    August-31-2015 12:10 AM

 iPhone iPhone  Ios  Objective C 
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Glen Martin
Glen Martin

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Posted on    August-31-2015 12:10 AM

Shallow copy is also known as address copy. In this process you only copy address not actual data while in deep copy you copy data.

Suppose there are two objects A and B. A is pointing to a different array while B is pointing to different array. Now what I will do is following to do shallow copy.

  Char *A = { a, b, c};

  Char *B = { x, y, z};

  B = A;

Now B is pointing is at same location where A pointer is pointing. Both A and B in this case sharing same data. if change is made both will get altered value of data. Advantage is that coping process is very fast and is independent of size of array.

while in deep copy data is also copied. This process is slow but Both A and B have their own copies and changes made to any copy, other will copy will not be affected.


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