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pass by reference in JScript.NET
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cool pal via .Net Guru (VIP)
Hi folks,

I am trying to use "pass by reference" of variables such as byte array, integers etc in JScript.NET.

Is this possible in JScript.NET?

If not, please help me out by any other approach by which we can pass the variables by reference.

Thanks a lot folks.
-Chandru

--------------------------------
From: cool pal

-----------------------
Posted by a user from .Net Guru (http://www.dot-net-guru.com/)

<Id>k992MJxrYkO5WJLxbFTN8Q==</Id>
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bruce barker
in .net all objects are passed by reference, only value types are by value.
pass by ref in .net means the variable pointer is passed, so the called
method can change what object the variable is pointing to. javascript.net
does not support this.

-- bruce (sqlwork.com)

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Martin Honnen
cool pal via .Net Guru wrote:

[Original message clipped]

If you use .NET arrays then these are passed by reference as they are
members of a reference type, e.g. the following

import System;

public class Test2004080501 {
public static function ArrayTest (array: byte[]) : void {
Console.WriteLine("ArrayTest received array: {0}.", array);
array[0] = 32;
}

public static function Main () : void {
var array : byte[] = new byte[3];
array[0] = 2;
array[1] = 4;
array[2] = 8;
Console.WriteLine("array[0]: {0}.", array[0]);
ArrayTest(array);
Console.WriteLine("array[0]: {0}.", array[0]);
}
}

Test2004080501.Main();

outputs

array[0]: 2.
ArrayTest received array: System.Byte[].
array[0]: 32.

--

    Martin Honnen
    http://JavaScript.FAQTs.com/
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Richard A. Lowe
If you mean pass by reference in the same way the the "ref" or "out"
keywords in C# or ByRef keyword in VB.NET do, then I don't think you can.

It appears all parameters are passed by value - the actual value in the case
of struct or primative value types and the value of the reference to an
object for heap-based class types. I don't think, for example, creating a
"Swap" function in JScript.NET would be possible, directly, where a function
swaps the value of two variables passed in.

An alternative is to create objects that act as parameter passers - i.e.
create a class with fields (or just an object array) and then get the values
out of that when the called function is finished.

Richard

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System.Byte
System.Console




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