Re: [boost] numeric_cast

Subject: Re: [boost] numeric_cast
From: Vicente Botet (vicente.botet_at_[hidden])
Date: 2011-06-22 12:50:44

Brandon Kohn wrote:
> 
> Hello,
> 
> Recently I was creating a new numeric type which I wanted to use along 
> with boost::numeric_cast. I read over the docs and examples and found 
> that it seemed to support (at least partially) the notion of policy 
> driven casting operations. I was unable to figure out how one might use 
> a custom conversion or overflow policy along with the actual 
> boost::numeric_cast<N>(x) function. In the end I created a workaround 
> which seemed to work nicely:
> 
> template <typename ConversionTraits, typename EnableIf = void>
> struct numeric_cast_traits
> {
>    typedef def_overflow_handler overflow_handler;
>    typedef UseInternalRangeChecker range_checker;
>    typedef Trunc
>      <
>          typename ConversionTraits::source_type
>      > rounding_policy;
> };
> 
> 

Hi,

I would prefer that numeric_cast_traits is templated with 

  typename Target, typename Source, typename EnableIf = void

as it seems to me more natural than using another trait as parameter.

Best,
Vicente

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