create new object of type... seems like it a reference?

[Guest]

probably something really stupid but.... I have created a 2 classes

public class PegBoard
{
public int Status;
}
public class BFSPegBoardNode
{
public PegBoard[,] BFSBoard;
public int rowFrom;
public int colFrom;
}

I have created a new object of this type
BFSPegBoardNode CurrentNode = new BFSPegBoardNode();
push it on a Queue
MyMoveQueue.Enqueue(CurrentNode);
then deQueue later on
CurrentNode = (BFSPegBoardNode)(MyMoveQueue.Dequeue());

What is happening is that the objects that exist on the queue are being
changed when i edit CurrentNode

Keep in mind... i am looking at CurrentNode... Enqueueing... Still edit
CurrentNode... then trying to push a seaparate instance.. is this not how it
works? is the queue just a queue of pointers or is my object declaration
wrong?

 

[Guest]

That's right - your queue contains pointers to the objects. In C# classes are
reference types, passed by reference, and structs are value types, passed by
value by defaut.

 

[Jon Skeet [C# MVP]]

That's right - your queue contains pointers to the objects. In C# classes are
reference types, passed by reference, and structs are value types, passed by
value by defaut.

No, reference type expressions are passed by value by default as well.
It's just that the value of a reference type expression is a reference.

See http://www.pobox.com/~skeet/csharp/parameters.html

 

[Jon Skeet [C# MVP]]

probably something really stupid but.... I have created a 2 classes

public class PegBoard
{
public int Status;
}
public class BFSPegBoardNode
{
public PegBoard[,] BFSBoard;
public int rowFrom;
public int colFrom;
}

I have created a new object of this type
BFSPegBoardNode CurrentNode = new BFSPegBoardNode();
push it on a Queue
MyMoveQueue.Enqueue(CurrentNode);
then deQueue later on
CurrentNode = (BFSPegBoardNode)(MyMoveQueue.Dequeue());

What is happening is that the objects that exist on the queue are being
changed when i edit CurrentNode

Keep in mind... i am looking at CurrentNode... Enqueueing... Still edit
CurrentNode... then trying to push a seaparate instance.. is this not how it
works? is the queue just a queue of pointers or is my object declaration
wrong?

The queue is a queue of references - all classes are reference types,
whereas structs are value types.

See http://www.pobox.com/~skeet/csharp/parameters.html and
http://www.pobox.com/~skeet/csharp/memory.html for a bit of discussion
around the subject. Some day I'll get round to writing an article just
on types themselves...