Re: [dotNetRDF-bugs] incorrect usage of Single.NaN and Double.NaN constants in numeric comparisons

[Rob V. <rv...@do...>]

Thanks for reporting this

This has been tracked as CORE-412
(http://dotnetrdf.org/tracker/Issues/IssueDetail.aspx?id=412) and is fixed
in default and will be included in our next release

Thanks,

Rob

From:  "Rassokhin, Dmitrii [JRDUS]" <DRA...@it...>
Reply-To:  dotNetRDF Bug Report tracking and resolution
<dot...@li...>
Date:  Saturday, 10 May 2014 02:30
To:  "dot...@li..."
<dot...@li...>
Subject:  [dotNetRDF-bugs] incorrect usage of Single.NaN and Double.NaN
constants in numeric comparisons

> For example, this type of error is encountered at line 102 in NumericNode.cs
> (version 1.04 stable):
>  
> return this.AsFloat() != 0.0f && this.AsFloat() != Single.NaN;
>  
> The second part of the expression, this.AsFloat() != Single.NaN, will always
> return true, even when this.AsFloat() returns the Single.NaN.
> NaN does not equal to any floating-point number, including self. Use
> !Single.IsNan(this.AsFloat()) instead.
>  
> I have found errors of this type in several other places throughout the source
> code. Please search for all usages of double.NaN, float.NaN, Double.NaN and
> Single.NaN.
>  
> Regards,
> Dmitrii Rassokhin.
> ------------------------------------------------------------------------------
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