id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
443	no Boolean conversion for boost::rational	Daryle Walker	Jonathan Turkanis	"{{{
The boost::rational class template, in header file <boost/
rational.hpp>, does not support conversion to a Boolean value.  It 
does have an ""operator !"" defined, though.  It is a surprise for a type 
to have one of these operations but not the other.  Currently code 
like ""if ( !r )"" works but not ""if ( r )"", which should be expected.  A 
solution is to add a conversion operator to a type that can be used in 
Boolean contexts, but as little else as possible.  A suggestion is to 
use a pointer-to-member (to data or function) type that is unique to 
each version of boost::rational, where the exact values are private.

}}}"	Bugs	closed		None	None		Fixed