[Bioperl-l] Grrrr. Another subtle overloading bug ...

[Ewan Birney]

On Wed, 9 Jan 2002, Steve Chervitz wrote:

> 
> My guess is that it won't work starting with 5.005,
> based on this note from the perl 5.005 delta docs:
> 
> "die() now accepts a reference value, and $@ gets set
> to that value in exception traps. This makes it
> possible to propagate exception objects. This is an
> undocumented experimental feature."
> 
> Anyway, I did some more digging and I'm pleased to
> report that I figured it out and there's a simple
> solution.
> 
> Turns out that Error.pm overloads numeric operations
> to call Error::value(), and this is triggered by
> if($@). So if you didn't have a -value parameter when
> you created the Error object, Error::value() returns
> undef and if($@) fails. 
> 
> The simple fix is for Bio::Root::Root::throw() to
> check whether or not a -value parameter was supplied,
> and if not (as when calling throw('string')), create a
> non-zero dummy value before calling Error::throw(). 
> I've got a fix for this that I'll commit soon.


just noticed the commit. Very nice Steve!



> 
> Steve
> 
> 
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Ewan Birney. Mobile: +44 (0)7970 151230, Work: +44 1223 494420
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