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Questions tagged [shallow-copy]

A shallow copy of an object is a duplicate that may not be fully independent of the original, in the sense that any references / pointers it holds to other objects refer to the same objects that the original's do. Use this tag for questions regarding implementing or using shallow copying methods.

Shallow copying is a process by which an object is duplicated to create a copy that may not be wholly independent of the original. Also known as "field by field" copying, this differs from deep copying with respect to the treatment of references / pointers to other objects: shallow copying copies the references / pointers held by the original, whereas deep copying makes a deep copy of each referenced object, too. Shallow copying is "shallow" in the sense that it copies only the original object itself, not any appearing deeper in its reference graph.

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Shallow copy in java?

As if we pass predefined list to the new ArrayList constructor it will SHALLOW-COPY that list which means reference to that list , so if we modify the new list ,the changes should also tends to modify at the old list .but in this programme it isnot…
sparsh goyal
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in c# code why below copy didn't work as reference copy?

Below c# code I run in Visual Studio 2019 Mac, I am a little surprise for the result: using System; namespace Test { public struct Point { public int x; private int y; public Point(int x, int y) { …
Penny
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What is the relation between move semantics and deep/shallow copy?

We can implement our own copy constructor if we don't want a shallow copy. So copy constructurs and copy assignment operators are used to implement deep copy. What sort of relation/interaction do move constructors and assignment operators have with…
JohnDo
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Create a shallow copy without leaking memory and dangling pointer in C++

Or is it not possible, and I have to do a deep copy. Lets say I have an object A, and I want to make a shallow copy of A into B. If I delete A, and A destroys all if its members, then B would have dangling pointers. If A doesn't destroy its…
Blubber
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JAVA it does not clone well

I tried to clone the object of Test2 using the "KUROONN" method. I expected the second line of the output to read [0,0], but the real result shows [33,4]. I have no idea why this happens, so can anyone explain this? import…
Nayuta Ito
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GO - Is array copy a deep copy or shallow copy?

For the below array, var a[2][3]int a[0][0] = 55 a[0][1] = 56 a[0][2] = 57 a[1][0] = 65 a[1][1] = 66 a[1][2] = 67 on performing array copy, a[0] = a[1] Question: Is the array(a[0]) copy a deep copy or shallow copy? After copy, Does a[0] have…
overexchange
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keeping lists separate and avoiding shallow copy in python

Here's my pseudo-code: class foo(bar): def __init__(self, aList): bar.__init__(self, aList) self.initialList = aList def clock(self): modify(self.workingList) if(something): self.workingList =…
Tayyar R
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VB .NET Textbox Shallow Copy into Dictionary

While there are many questions about shallow copy vs. deep copy, I couldn't find one specific to TextBoxes and Dictionaries in VB .NET. I believe my problem is unique enough to deserve it's own thread. In VB .NET I am trying to implement a…
Murky Macadamian
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Why deep copy with putAll() is invalid in this example?

import java.util.HashMap; public class test { public static void main(String[] args) { HashMap map1 = new HashMap<>(); HashMap map2 = new HashMap<>(); HashMap map3 = new…
speed milo
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Questions about a Segmentation Fault in C++ most likely caused by a custom copy constructor

I'm getting a segmentation fault which I believe is caused by the copy constructor. However, I can't find an example like this one anywhere online. I've read about shallow copy and deep copy but I'm not sure which category this copy would fall…
lightswitch05
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Deep copy vs shallow copy for structs

I had deep dived in some comparisons about deep or shallow copy while passing a struct with primitive and pointer fields. Like: type Copy struct { age int ac *AnotherCopy } type AnotherCopy struct { surname string } func main() { …
Serhat Yılmaz
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passing of structure with pointer member in function is shallow copy or deep copy In C

In C++, there is overloaded copy constructor and assignment overloading for a deep copy. Since default available is a shallow copy. In C, the structure which has pointer member, if passed to a function or assigned to already created new struct…
Laxmi Kadariya
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How to implement an assignment operator so multiple instances share common data?

I am working on C++11 application. I am implementing assignment operator. I want that if I modify one value after the assignment both objects get modified. Example: Object o1, o2; o1.setId("id1"); o2 = o1; o2.setId("id2"); cout << o1.getId(); …
RuLoViC
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How to reverse shallow copy a javascript array (container)?

Need help creating a custom object type that performs a reverse shallow copy? For example: arrayobj.slice(0) returns a new array object with the same length but each index maintains a reference to the object found at the same index of the original…
Benjamin McFerren
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Jave: trouble with my shallow copy constructor

I have trouble with my java homework. I am making a Matrice class and i have trouble with the shallow constructor that take another Matrice as argument. Public class Matrice implements IMatrice{ private static int numLignes ; private static int…
user3508287
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