Re: [boost] [chrono] patch for VC9 duration conversions

Subject: Re: [boost] [chrono] patch for VC9 duration conversions
From: Vicente Botet (vicente.botet_at_[hidden])
Date: 2011-02-23 07:40:00

David Deakins wrote:
> 
> Currently the enable_if expressions that restrict implicit duration type 
> conversion to only conversions that will not reduce resolution are 
> disabled on VC9 because they trigger a compiler error.  I have come up 
> with a slight adjustment to the expression that VC9 appears to be able 
> to digest more favorably.  Attached is a patch.  I also opened ticket 
> 5214 in Trac with this information.  Vincent, if the patch looks good, 
> let me know if you want to apply it or if you would like me to.
> 
> -Dave
> 
> 

Hi,

thanks for looking at this VC9 issue. And congratulation for the first
Chrono ticket I'm aware off :)

I was unable to find out why VC9 had some problems with these enable_if
expressions.

I see that you have removed 2 cases, but there are others. Have you tried to
analyze them?

The patch seem good to me except that we are adding a ratio detail. Maybe it
will be better to add the is_evenly_divisible_by metafunction in the details
of Boost.Chrono for the moment. 

Please be free to apply the patch yourself. I will try to see if similar
workarounds can solve the other cases.

Many thanks Dave,
Vicente

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