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Copy one object to another


Copy one object to another

By : user3855652
Date : January 02 2021, 06:48 AM
like below fixes the issue Can you create a constructor on UserProfile that takes a User instance as a parameter and do it there? Not sure that is the best approach or if that violates good design. There is a utility called AutoMapper out there that is good at inferring links between two seemingly unrelated objects, you may want to check that out because it is pretty cool.
code :


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Why Copy constructor is NOT called to copy the temporary object to the new defined object

Why Copy constructor is NOT called to copy the temporary object to the new defined object


By : Bharadwaj Jannu
Date : March 29 2020, 07:55 AM
hope this fix your issue ,
Why?
Java clone shallow-copy deep-copy copy-constructor nested object

Java clone shallow-copy deep-copy copy-constructor nested object


By : Michael Grabow
Date : March 29 2020, 07:55 AM
will be helpful for those in need That's how the copy constructor and the clone method should be:
For the student:
code :
 //Copy constructor for the student
 Student(Student copyCons){
    this._rollNo = copyCons._rollNo;
    this._name = copyCons._name;
    this._address = copyCons._address;
    this._teacher = copyCons._teacher.clone();
}

 //Clone for the student
 protected Student clone(){
     return new Student(this);
 }
//This is the copy constructor
Teacher(Teacher t){
        setName(t.getName());
 }

//That's how you clone an object of type teacher
protected Teacher clone(){
   return new Teacher(this);
}
Teacher t1 =  new teacher("Teacher 1");
Teacher t1Clone = t1.clone();

Student s1 = new Student(15007, "Amit", "Chirimiri", t1);
Student s1Clone = s1.clone();
How to append/copy an STL container object to another object when its value is not copy constructible e.g. std::thread

How to append/copy an STL container object to another object when its value is not copy constructible e.g. std::thread


By : Sibu Stephen
Date : March 29 2020, 07:55 AM
help you fix your problem std::thread is not copy-constructible, you'll have to use an iterator that allows moves:
code :
m1.insert(std::make_move_iterator(m2.begin()),
          std::make_move_iterator(m2.end());
copy object with objects avoiding mutation of the initial object (avoid copy references)

copy object with objects avoiding mutation of the initial object (avoid copy references)


By : Dheeraj Mittal
Date : March 29 2020, 07:55 AM
I wish this help you I have a question regarding copy of object by reference , use this way:
code :
let a = {
  "0": {
    "sortPluginSettings": {
      "columnSortType": "numeric",
      "sortingOrder": "noSort"
    }
  }
}

var b= JSON.parse(JSON.stringify(a));

b[0].sortPluginSettings.columnSortType=null;

console.log(a);
console.log(b);
Why is a copy of a pandas object altering one column on the original object? (Slice copy)

Why is a copy of a pandas object altering one column on the original object? (Slice copy)


By : Programmer
Date : March 29 2020, 07:55 AM
may help you .
As I understand, a copy by slicing copies the upper levels of a structure, but not the lower ones.
code :
In [44]: lst = [[1, 2], 3, 4]                                                      

In [45]: lst2 = lst[:]                                                             

In [46]: lst2[1] = 100                                                             

In [47]: lst  # unchanged                                                          
Out[47]: [[1, 2], 3, 4]

In [48]: lst2[0].append(3)                                                         

In [49]: lst  # changed                                                            
Out[49]: [[1, 2, 3], 3, 4]
In [50]: arr = np.array([1, 2, 3])                                                 

In [51]: arr2 = arr[:]                                                             

In [52]: arr2[0] = 100                                                             

In [53]: arr                                                                       
Out[53]: array([100,   2,   3])
In [62]: df = pd.DataFrame([[1, 2, 3], [4, 5, 6]])                                 

In [63]: df                                                                        
Out[63]: 
   0  1  2
0  1  2  3
1  4  5  6

In [64]: df2 = df[:]                                                               

In [65]: df2.iloc[0, 0] = 100                                                      

In [66]: df                                                                        
Out[66]: 
     0  1  2
0  100  2  3
1    4  5  6
dfmi['one']['second'] = value
# becomes
dfmi.__getitem__('one').__setitem__('second', value)
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