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rizaado

Call function without parentheses

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rizaado

Hello. What is the aim of the #Region II:

#include <MsgBoxConstants.au3>

Func func1 ()

   Return True

EndFunc

#Region I(call function with parentheses)

MsgBox($MB_SYSTEMMODAL, "", func1())

#EndRegion

#Region II(call function without parentheses)

MsgBox($MB_SYSTEMMODAL, "", func1)

#EndRegion

I know that #Region II func1 returns itself by reference(its address) to MsgBox(nothing to see but fact).

I am going to prove what I said before:

#include <MsgBoxConstants.au3>

Func func1 ()

   Return True

EndFunc

Global $varFunc1 = func1

MsgBox($MB_SYSTEMMODAL, "", $varFunc1())

What is the aim of calling function without parentheses? Give example. Thank you...

Edited by rizaado

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Melba23

rizaado,

Welcome to the AutoIt forums.

I think you have answered your own question - you use the function name without parentheses to assign it to a variable. One advantage is that you can then pass this variable as a parameter to another function which can then internally call whatever function was assigned to the variable - look at the use of $hUserFunction in  _ArrayDisplay to see this in action.

I am afraid that you will have to wait for someone more knowledgeable than me to get more info than that.

M23


Any of my own code posted anywhere on the forum is available for use by others without any restriction of any kind._______My UDFs:

Spoiler

ArrayMultiColSort ---- Sort arrays on multiple columns
ChooseFileFolder ---- Single and multiple selections from specified path treeview listing
Date_Time_Convert -- Easily convert date/time formats, including the language used
ExtMsgBox --------- A highly customisable replacement for MsgBox
GUIExtender -------- Extend and retract multiple sections within a GUI
GUIFrame ---------- Subdivide GUIs into many adjustable frames
GUIListViewEx ------- Insert, delete, move, drag, sort, edit and colour ListView items
GUITreeViewEx ------ Check/clear parent and child checkboxes in a TreeView
Marquee ----------- Scrolling tickertape GUIs
NoFocusLines ------- Remove the dotted focus lines from buttons, sliders, radios and checkboxes
Notify ------------- Small notifications on the edge of the display
Scrollbars ----------Automatically sized scrollbars with a single command
StringSize ---------- Automatically size controls to fit text
Toast -------------- Small GUIs which pop out of the notification area

 

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rizaado

Melba23, thank you once again for your comment but if someone wants to continue discussing this topic try on I will be waiting. I think I understand my misunderstood before. Some days I have professional deviation... I think that there are parts of the documentation that must be updated and must be written for the first time. I offer my services...

Edited by rizaado

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Malkey

..... What is the aim of the #Region II:

....
#Region II(call function without parentheses)
MsgBox($MB_SYSTEMMODAL, "", func1)
#EndRegion

....

My understanding is there are two way to call a function ( maybe 3 ways when using Execute):-

"function name" followed by parentheses; and,

Call ( "function name" [, param1 [, param2 [, paramN]]] ).

In all cases the "function name" may be stored in a variable.

An example.

#include <MsgBoxConstants.au3>

func2(MsgBox, func1) ; The two parameters are names of functions.

#region II(Is not calling a function when without parentheses)
MsgBox($MB_SYSTEMMODAL, "2", func1) ; Meaningless - just a function name
#endregion II(Is not calling a function when without parentheses)

#region III(function names without parentheses as parameters)
MsgBox($MB_SYSTEMMODAL, "3", func1, MsgBox, Chr) ; More meaningless function names.
#endregion III(function names without parentheses as parameters)


Func func2($sBuiltInFunc, $Func)
    $sBuiltInFunc($MB_SYSTEMMODAL, "1", $Func()) ; Function name in variable with following parentheses, calls that function.
    Return True
EndFunc   ;==>func2

Func func1()
    Return True
EndFunc   ;==>func1

 

 

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jaberwacky

I guess you could go this route too.

; the practices you see here aren't exactly always the best
; only meant for demonstration purposes

#include <Array.au3>

Const $numbers[10] = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Const $numbers_by_two = Map($numbers, MultByTwo)

_ArrayDisplay($numbers_by_two)

Func Map(Const $list, Const $function)
    Local Const $u_bound = UBound($list) 
    
    Local $new_list[$u_bound]
    
    For $i = 0 To $u_bound - 1
        $new_list[$i] = $function($list[$i])
    Next
    
    Return $new_list
EndFunc

Func MultByTwo(Const $number)
    Return $number * 2
EndFunc

 

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rizaado

Thank you. I examined this examples...

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