Abs: Difference between revisions

Latest revision as of 17:22, 15 August 2012

A very simple macro to get an integer's absolute value.

!define Abs "!insertmacro _Abs"
!macro _Abs _RetVal_ _Value_
   IntOp ${_RetVal_} ${_Value_} & 0x7FFFFFFFFFFFFFFF
!macroend

Usage:

StrCpy $0 -40
${ABS} $0 $0  ; $0 = 40

@@ Line 1: / Line 1: @@
 {{PageAuthor|Lloigor}}
-Very simple macro to get the absolute value of an integer, without the math plugin.
+A very simple macro to get an integer's absolute value.
-<highlight-nsis>;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+<highlight-nsis>!define Abs "!insertmacro _Abs"
-;; Get Absolute value of an Integer
+!macro _Abs _RetVal_ _Value_
-;; P1 :io: Integer
+    IntOp ${_RetVal_} ${_Value_} & 0x7FFFFFFFFFFFFFFF
-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-!define Abs "!insertmacro _Abs"
-!macro _Abs _Value_
-   IntCmp ${_Value_} -1 0 0 +2       ;; Is it negative?
-    IntOp ${_Value_} ${_Value_} * -1  ;; Yes. Make it positive
 !macroend</highlight-nsis>
-Usage:<highlight-nsis>IntOp $IntVar 0 - 21   ; $IntVar = -21
+Usage:<highlight-nsis>StrCpy $0 -40
-${ABS} $IntVar         ; $IntVar = 21</highlight-nsis>
+${ABS} $0 $0  ; $0 = 40</highlight-nsis>
 [[Category:Math Functions]]