[Boost-users] [Range] Single Pass Range functionality

Subject: [Boost-users] [Range] Single Pass Range functionality
From: Edward Diener (eldiener_at_[hidden])
Date: 2009-02-22 19:32:47

In the Boost Range documentation describing the Range concepts for a 
single pass range it lists in the expression semantics post-condition 
for boost::begin(a):

"boost::begin(a) is either dereferenceable or past-the-end. It is 
past-the-end if and only if boost::distance(a) == 0."

However the documentation for single pass range does not list 
boost::distance as a valid expression nor in the reference section is 
boost::distance listed as a single pass range function.

Is boost::distance a valid function when applied to a single pass range ?