Re: [boost] saturated casts..

From: Jonathan Wakely (cow_at_[hidden])
Date: 2005-01-13 13:22:22

On Thu, Jan 13, 2005 at 05:02:33PM +0100, Kristian Dupont wrote:

> Forgive me if this topic has been discussed before - searching for "casts"
> and the like in the archives bring out quite a lot of results :)
> 
> Although numeric_cast allows you to safely cast between numeric types, I
> find that it can sometimes come in handy to just receive the saturated value
> in the case of an overflow. A simplified solution would look something like
> this:
> 
> template<class Source, class Target>

Should that be 
    template<class Target, class Source>
because you want Source to be deduced?

jon

> inline Target saturated_cast(Source val)
> {
>     BOOST_STATIC_ASSERT(std::numeric_limits<Target>::is_specialized);
> 
>     if(val < (std::numeric_limits<Target>::min)())
>         return (std::numeric_limits<Target>::min)();
> 
>     if(val > (std::numeric_limits<Target>::max)())
>         return (std::numeric_limits<Target>::max)();
> 
>     return static_cast<Target>(val);
> }
> 
> I think that this would fit nicely into cast.hpp. Any comments?
> 
> Kristian Dupont

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