Re: protocol for using InputRanges

[Daniel Murphy]

"Regan Heath"  wrote in message 
news:op.xdb9a9v354x...@puck.auriga.bhead.co.uk...

What guarantees range2 is longer than range1?  The isArray case checks 
explicitly, but the generic one doesn't.  Is it a property of being an 
output range that it will expand as required, or..

Some ranges will give you their length...