[Boost-users] extending boost::rational to represent infinities

From: Jedediah Smith (jedediah_at_[hidden])
Date: 2005-04-03 05:08:02

I need a type equivelant to rational<int> but supporting two special 
values, +inf and -inf which compare greater and less (respectively) to 
all other values besides themselves. I don't need to perform any 
arithmetic on the inf values so those operations can be undefined.

What is the best strategy for creating such a type? Would it be better 
to subclass rational or create an underlying integer type with the inf 
values and use rational based on that underlying type? If the former 
option, how exactly would I do it?