C#•2y ago

❔ C# Fundamental: does setting one object to another point or copy?

public SomeType someObject = new SomeType();
public SomeType anotherObject = someObject;

public SomeType someObject = new SomeType();
public SomeType anotherObject = someObject;

this is probably a braindead question but in this code, is anotherObject "pointing" to someObject (changing the instance variables of one will change the other's) or does anotherObject copy the values of someObject into a new object? im new to the language and trying to develop an understanding

9 Replies

mtreit•2y ago

Yes it's pointing to it

ero•2y ago

this doesn't compile but it would point, yes

PacrombieOP•2y ago

i know it doesn't compile, i was just trying to get the point across thank you

Unknown User•2y ago

Message Not Public

MODiX•2y ago

tebeco#0205

REPL Result: Success

int i = 3;
int j = i;
Console.WriteLine((i, j));
j = 5;
Console.WriteLine((i, j));
i = 1;
Console.WriteLine((i, j));

int i = 3;
int j = i;
Console.WriteLine((i, j));
j = 5;
Console.WriteLine((i, j));
i = 1;
Console.WriteLine((i, j));

Console Output

(3, 3)
(3, 5)
(1, 5)

(3, 3)
(3, 5)
(1, 5)

Compile: 602.492ms | Execution: 76.052ms | React with ❌ to remove this embed.

MODiX•2y ago

mtreit#6470

REPL Result: Success

SomeType someObject = new SomeType();
SomeType anotherObject = someObject;
Console.WriteLine(object.ReferenceEquals(someObject, anotherObject));

class SomeType
{
}

SomeType someObject = new SomeType();
SomeType anotherObject = someObject;
Console.WriteLine(object.ReferenceEquals(someObject, anotherObject));

class SomeType
{
}

Console Output

True

True

Compile: 649.891ms | Execution: 74.328ms | React with ❌ to remove this embed.

mtreit•2y ago

You can use ReferenceEquals if you want to see if two variables point to the same object on the heap

Unknown User•2y ago

Message Not Public

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ C# Fundamental: does setting one object to another point or copy?