This method is 10x faster, and more accurate (although the word is
meaningless at such scale due to the nature of IEEE floats):
private function safeBitCheck2(l : Number, r : Number) : Boolean
{
if (r > l)
return false;
if (r == l)
return true;
if ((l <= uint.MAX_VALUE) && (r <= uint.MAX_VALUE))
return (l & r) == r;
var rs : String = r.toString(32);
var ls : String = l.toString(32).substring(-rs.length);
var split : uint = uint(rs.length) >> 1;
if (safeBitCheck2(parseInt(ls.substr(0, split), 32),
parseInt(rs.substr(0, split), 32)))
return safeBitCheck2(parseInt(ls.substr(split), 32),
parseInt(rs.substr(split), 32));
return false;
}
What on earth do you actually need this function for?
-Josh
2009/1/20 Rafael Faria <[email protected]>
> Thanks Josh.
>
> I kinda managed to get it working.
> so for the records if someone else need it, it seems to work fine.
>
>
> private function
> safeBitCheck(num:Number,comparison:Number):Boolean
> {
> if(num < 2147483647 ) {
> return (num & comparison)==comparison;
> } else {
> var binNumber:String = strrev(base_convert(num,10,2));
> var binComparison:String =
> strrev(base_convert(comparison,10,2));
> for(var i:uint=0; i<binComparison.length; i++ ) {
> if( binNumber.length < i ||
> (binComparison.charAt(i)==="1"
> && binNumber.charAt(i)==="0") ) {
> return false;
> }
> }
> return true;
> }
> }
>
> public function strrev(str:String):String {
> return str.split("").reverse().join("");
> }
>
> public function base_convert(num:Number, frombase:Number,
> tobase:Number):String {
> return parseInt(num+'',
> frombase+0).toString(tobase+0);
> }
>
>
>
>
> --- In [email protected], Josh McDonald <dzn...@...> wrote:
> >
> > Does "result = (uint(number) & uint(comparison))" work?
> >
> > -Josh
> >
> > 2009/1/20 Rafael Faria <rafaelfaria.gru...@...>
> >
> > >
> > > Please,
> > >
> > > anyone with skills to convert the following php function to flex? i'm
> > > killing myself trying...
> > >
> > > please... anyone?
> > >
> > > thanks
> > > rafael
> > >
> > > -----
> > >
> > > /**
> > > * Perform a float-safe bitwise AND comparison
> > > *
> > > * @param int/float $number The number to which to perform a
> bitwise AND
> > > * @param int/float $comparison The number with which to perform a
> > > bitwise AND
> > > * @return bool
> > > */
> > > function safeBitCheck($number,$comparison) {
> > > if( $number < 2147483647 ) {
> > > return ($number & $comparison)==$comparison;
> > > } else {
> > > $binNumber = strrev(base_convert($number,10,2));
> > > $binComparison = strrev(base_convert($comparison,10,2));
> > > for( $i=0; $i<strlen($binComparison); $i++ ) {
> > > if( strlen($binNumber)<$i || ($binComparison{$i}==="1" &&
> > > $binNumber{$i}==="0") ) {
> > > return false;
> > > }
> > > }
> > > return true;
> > > }
> > > }
> > >
> > > safeBitCheck(17,16); // true
> > > safeBitCheck(17,2); // false
> > > safeBitCheck((4294967296+8589934592),4294967296); // true
> > > safeBitCheck(2,8589934592); // false
> > >
> > >
> > > ------------------------------------
> > >
> > > --
> > > Flexcoders Mailing List
> > > FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt
> > > Alternative FAQ location:
> > >
>
> https://share.acrobat.com/adc/document.do?docid=942dbdc8-e469-446f-b4cf-1e62079f6847
> > > Search Archives:
> > > http://www.mail-archive.com/flexcoders%40yahoogroups.comYahoo! Groups
> > > Links
> > >
> > >
> > >
> > >
> >
> >
> > --
> > "Therefore, send not to know For whom the bell tolls. It tolls for
> thee."
> >
> > Like the cut of my jib? Check out my Flex blog!
> >
> > :: Josh 'G-Funk' McDonald
> > :: 0437 221 380 :: j...@...
> > :: http://flex.joshmcdonald.info/
> > :: http://twitter.com/sophistifunk
> >
>
>
>
> ------------------------------------
>
> --
> Flexcoders Mailing List
> FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt
> Alternative FAQ location:
> https://share.acrobat.com/adc/document.do?docid=942dbdc8-e469-446f-b4cf-1e62079f6847
> Search Archives:
> http://www.mail-archive.com/flexcoders%40yahoogroups.comYahoo! Groups
> Links
>
>
>
>
--
"Therefore, send not to know For whom the bell tolls. It tolls for thee."
Like the cut of my jib? Check out my Flex blog!
:: Josh 'G-Funk' McDonald
:: 0437 221 380 :: [email protected]
:: http://flex.joshmcdonald.info/
:: http://twitter.com/sophistifunk
