From: "Ovanes Markarian" <om_boost@keywallet.com>
Ok, I see. This is a bit more complex. ;) Can you influence a type passed to numeric_limits? If yes you can do this:
Thought about that, but it's suboptimal - see my response to me22 for more on this. Basically, I'd like any existing usage of numeric_limits<double> to be able to be replaced by numeric_limits<DecimalType> without any other changes. It wouldn't be *too* bad to do this: template< class T, class Enable = void > decimal_limits {}; template <> decimal_limits <double> : public std::numeric_limits <double> {}; template <> decimal_limits <float> : public std::numeric_limits <float> {}; template <class T> decimal_limits <T, enable_if<is_decimal_type<T> > > { // my decimal_limits implementation }; However, this would require users of my library to replace all references to numeric_limits with decimal_limits, so this is also less than ideal. Suppose the user has the following code: template<typename T = double> int f(const T& x) { x = abs(x); int i = 0; while(x > std::numeric_limits<T>::epsilon()) ++i; return i; } Ideally, the user should be able to do this: f<new_decimal_type> (some_new_decimal_value); and it should work with no modifications to the original function. - James Jones Administrative Data Mgmt. Webmaster 375 Raritan Center Pkwy, Suite A Data Architect Edison, NJ 08837