Re: Negation Error

I have version 0.4304 of DateTime (the latest). In that version, line 1651 is the return from _compare_overload:

sub _compare_overload
{
    # note: $_[1]->compare( $_[0] ) is an error when $_[1] is not a
    # DateTime (such as the INFINITY value)
    return $_[2] ? - $_[0]->compare( $_[1] ) : $_[0]->compare( $_[1] )
+;
}
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_compare_overload is overloaded to <=> and cmp for DateTime objects. So a good place to start tracking this down would be any place you compare DateTime objects (recognizing that the offending call/comparison may be coming from some other module that you are using).

Comment on Re: Negation Error Select or Download Code

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Re^2: Negation Error by Herkum (Parson) on Sep 21, 2008 at 01:13 UTC
OK, that is bizarre, considering I don't see it anywhere else in my application, but at least you pointed something to look at. The issue is that I take Date/Time from a database and cast all the rows as DateTime objects. So when I see a generic error like this, it makes me nervous as hell because I have no idea where to start because I am not doing anything special on the web server. Poking around for DT comparisons, that I can do. I certainly hope it is not in something that I did not write. :)	[reply]
Re^3: Negation Error by ikegami (Patriarch) on Sep 21, 2008 at 01:35 UTC
Do you sort DateTime objects? The default sorter is `$a cmp $b`.	[reply] [d/l]
Re^4: Negation Error by Herkum (Parson) on Sep 21, 2008 at 16:50 UTC
I was going to say no, but then I realized I do some sorting of dates on the web site. I am also using Template Toolkit so it might contribute to the problem also(based upon the type of sorting I am doing).	[reply]