Add addrmap_mutable::clear

It was convenient to add a 'clear' method to addrmap_mutable.  The
cleanest way to do this was to change the class to lazily initialize
its 'tree' member.  This also makes addrmap_mutable::operator= a bit
less weird.

Approved-By: Simon Marchi <simon.marchi@efficios.com>


2 files changed