[Development] Comparing two reals in Qt code

Dominik Holland dominik.holland at pelagicore.com
Mon Dec 3 08:52:09 CET 2012


can we please go back to the initial question of whether it is worth the 
effort to use a more robust way of real comparison in qquickitem ?


P.S.: I'm aware of it that how we compare the reals is also important, 
but that's not the aim of that mail

On 11/30/2012 01:36 PM, Samuel Rødal wrote:
> On 11/30/2012 09:51 AM, Jedrzej Nowacki wrote:
>> On Friday 30. November 2012 09.23.32 Samuel Rødal wrote:
>>> Yep, having something similar to AlmostEqualUlpsAndAbs() would be great.
>>> I've had some ideas of making qFuzzyCompare work that way in the past,
>>> but gave them up due to not wanting to risk subtly breaking a lot of
>>> existing code. Introducing a new function, with default but customizable
>>> arguments for the max differences, sounds like the way to go.
>>> The following tasks might be relevant:
>>> https://bugreports.qt-project.org/browse/QTBUG-26453
>>> https://bugreports.qt-project.org/browse/QTBUG-16819
>> Hi,
>>      Is qFuzzyCompare compatible with ECMAScript standard for float comparision?
>> It would not be good if sometimes two, const floats are equals and somtimes
>> not.
> ECMAScript float comparison doesn't seem to be fuzzy, at least from what
> I can tell here: http://www.ecma-international.org/ecma-262/5.1/#sec-11.9.3
> --
> Samuel
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