From: Richard Peters (r.a.peters_at_[hidden])
Date: 2004-05-04 07:32:01
The documentation of enable_if reads:
3 Using enable_if
The enable_if templates are defined in boost/utility/enable_if.hpp, which
is included by boost/utility.hpp.
but the header boost/utility/enable_if.hpp is not included by
Boost list run by bdawes at acm.org, gregod at cs.rpi.edu, cpdaniel at pacbell.net, john at johnmaddock.co.uk