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ByRef explanation

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Can someone explain me what ByRef really means?
For example

_MyFunc(ByRef $a, ByRef $b, ByRef $c)
...
...
EndFunc

 

I don't quiet understand the explanations of the help file.

I had some trouble with ByRef lately that is why i am asking this.

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Normally when you pass a value to a function, the value stays inside the function as the variable you assigned to it. When you pass it ByRef, a copy of the original variable is passed and anything done to the byref variable is reflected in the value of the variable you passed to that function.

Global $test = 123
FuncNotByRef($test)
ConsoleWrite("Value of $test after the function = " & $test & @CRLF)
FuncByRef($test)
ConsoleWrite("Value of $test after the function = " & $test & @CRLF)
Func FuncNotByRef($incoming)
    ConsoleWrite("Value of $incoming = " & $incoming & @CRLF)
    $incoming = 456
    ConsoleWrite("Value of $incoming is now = " & $incoming & @CRLF)
EndFunc   ;==>FuncNotByRef
Func FuncByRef(ByRef $incoming)
    ConsoleWrite("Value of $incoming = " & $incoming & @CRLF)
    $incoming = 456
    ConsoleWrite("Value of $incoming is now = " & $incoming & @CRLF)
EndFunc   ;==>FuncByRef

If I posted any code, assume that code was written using the latest release version unless stated otherwise. Also, if it doesn't work on XP I can't help with that because I don't have access to XP, and I'm not going to.
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Back up and restore Windows user files _Array.au3 - Modified array functions that include support for 2D arrays.  -  ColorChooser - An add-on for SciTE that pops up a color dialog so you can select and paste a color code into a script.  -  Customizable Splashscreen GUI w/Progress Bar - Create a custom "splash screen" GUI with a progress bar and custom label.  -  _FileGetProperty - Retrieve the properties of a file  -  SciTE Toolbar - A toolbar demo for use with the SciTE editor  -  GUIRegisterMsg demo - Demo script to show how to use the Windows messages to interact with controls and your GUI.  -   Latin Square password generator

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Did you get that backwards there?

Oops, yeah, in ByRef a pointer to the original is passed, and when not ByRef a copy is passed. 

I knew what I meant, just can't seem to put it on the page the way I was thinking it. :D

 

At least the script was right LOL


If I posted any code, assume that code was written using the latest release version unless stated otherwise. Also, if it doesn't work on XP I can't help with that because I don't have access to XP, and I'm not going to.
Give a programmer the correct code and he can do his work for a day. Teach a programmer to debug and he can do his work for a lifetime - by Chirag Gude
How to ask questions the smart way!

I hereby grant any person the right to use any code I post, that I am the original author of, on the autoitscript.com forums, unless I've specifically stated otherwise in the code or the thread post. If you do use my code all I ask, as a courtesy, is to make note of where you got it from.

Back up and restore Windows user files _Array.au3 - Modified array functions that include support for 2D arrays.  -  ColorChooser - An add-on for SciTE that pops up a color dialog so you can select and paste a color code into a script.  -  Customizable Splashscreen GUI w/Progress Bar - Create a custom "splash screen" GUI with a progress bar and custom label.  -  _FileGetProperty - Retrieve the properties of a file  -  SciTE Toolbar - A toolbar demo for use with the SciTE editor  -  GUIRegisterMsg demo - Demo script to show how to use the Windows messages to interact with controls and your GUI.  -   Latin Square password generator

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