C
C#•3y ago
Pacrombie

❔ 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
mtreit•3y ago
Yes it's pointing to it
ero
ero•3y ago
this doesn't compile but it would point, yes
Pacrombie
PacrombieOP•3y ago
i know it doesn't compile, i was just trying to get the point across thank you
Unknown User
Unknown User•3y ago
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MODiX
MODiX•3y 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
MODiX•3y 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
mtreit•3y ago
You can use ReferenceEquals if you want to see if two variables point to the same object on the heap
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Unknown User•3y ago
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Accord
Accord•3y 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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