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Re: bug or not? constants warn only once

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Nicholas Clark
April 24, 2008 10:39
Re: bug or not? constants warn only once
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On Thu, Apr 24, 2008 at 07:23:50PM +0200, H.Merijn Brand wrote:

> > The implementation caches the numeric result, and uses that next time round,
> > before it gets a chance to warn. It's been this way since (at least) 5.005_03
> > (which is the oldest perl I have hanging around)
> > 
> > So is this a bug? Advice from Klortho #11943 suggests not:
> Not a bug. I recall relying on this behaviour somewhere to speed up
> loops. When you add 0 to a string value, it fills the IV/NV, so inside
> the loop it doesn't have to convert.

Oh, I didn't mean that the caching was a bug. No, caching is key.
I meant that not warning felt buggy.

Although, this is a simpler example:

$ ./perl -lwe '$a = "Pie"; print 0 + $a; print 0 + $a'
Argument "Pie" isn't numeric in addition (+) at -e line 1.

Nicholas Clark

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