I'm writing a class template where the template parameter is a type that should represent real numbers. It started choking when using boost::rational when I needed Boolean conversion, e.g. template < typename T > void my_class<T>::my_func() { if ( this->s_ ) //... } Looking at boost::rational, I noticed that it does NOT have a Boolean conversion operator (i.e. an unspecified numeric/pointer type). Before anyone says that's proper, realize that boost::rational DOES have "operator not()" defined! This is a surprise to the typical C++ programmer. Either both should be defined, or neither. I think that boost::rational should add a Boolean conversion. (It's a quick fix, and it is critical, so it should be done for this release.) Incidentally, maybe we should define another helper template for <boost/operators.hpp>. If a type supports default construction and equality via "operator ==()", then a Boolean conversion and "operator not()" will be added. (It's up to the user to make sure the type is numeric and the default value is equivalent to zero.) -- Daryle Walker Mac, Internet, and Video Game Junkie darylew AT hotmail DOT com