On Thu, Nov 24, 2011 at 10:56:57AM +0100, Lionel Elie Mamane wrote:
> I understand we don't want to touch that in stable branch, but anyone
> opposing me pushing something like that in master, and similar for
> llimit_cast and limit_cast?
> // assumptions:
> // \forall typename Type:
> // ( (::std::numeric_limits< Type >::min() == 0) XOR (
> ::std::numeric_limits< Type >::min() < 0 && ::std::numeric_limits< Type
> >::is_signed ))
> // && (::std::numeric_limits< Type >::max() > 0 )
> template< typename ReturnType, typename Type >
> inline ReturnType ulimit_cast( Type nValue, ReturnType nMax )
> {
> if ( ! ::std::numeric_limits< ReturnType >::is_signed &&
> ::std::numeric_limits< Type >::is_signed && nValue < 0 )
> return nMax;
> // Due to implicit type conversion, the comparison in the if occurs in
> the type
> // that has the biggest ::max()
> // -> safe; compiler gives a warning for mixed signed/unsigned, though
> // Assuming unbounded signed types are unbounded towards both infinities.
> else if ( ! ::std::numeric_limits< ReturnType >::is_bounded ||
> ::std::numeric_limits< ReturnType >::max() >
> ::std::numeric_limits< Type >::max() )
That should be:
else if ( ! ::std::numeric_limits< ReturnType >::is_bounded ||
nMax > ::std::numeric_limits< Type >::max() )
Obviously.
> // nValue fits, and it is unsafe to compare nMax to nValue within Type:
> // nMax would be converted
> return static_cast < ReturnType >(nValue);
> else
> // nMax fits in Type; safe to compare to nValue within Type
> return static_cast< ReturnType >(::std::min<Type>(nValue, nMax));
> }
--
Lionel
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