[Boost-users] how to make fusion::pair less-than-comparable?

From: Zeljko Vrba (zvrba_at_[hidden])
Date: 2008-08-21 10:27:35

Related to my previous question: fusion::map is a sequence and instances of it
could be directly compared with operator < , thus vectors of instances also 
sorted if fusion::pair supported relational operators other than == and !=
(which it doesn't).

So, two questions:

1. What is the recommended way of defining operator< for particular pair
   instances (e.g. for pair<net, int>) ?

2. An explanation of why doesn't fusion::pair define at least operator< would
   be welcome. 

Thanks.

(Yes, I know, I can pass an explicit predicate to std::sort..  )