- Add History::clear() to empty an existing history (equivalent

to removing all of its resources and all of its processes, but
faster)


git-svn-id: svn://svn.gna.org/svn/sgpemv2/trunk@887 3ecf2c5c-341e-0410-92b4-d18e462d057c

src/backend/concrete_history.cc

@@ -290,6 +290,17 @@ ConcreteHistory::remove(SubRequest& subrequest)
 }
 
 
+void
+ConcreteHistory::clear()
+{
+  for_each(_snapshots.begin(), _snapshots.end(),
+           deletor<ConcreteEnvironment>());
+  _snapshots.clear();
+  _snapshots.push_back(new ConcreteEnvironment());
+  assert(_snapshots.size() == 1);
+}
+
+
 ConcreteHistory::ResourcePair
 ConcreteHistory::add_resource(const Glib::ustring& name,
                               bool   preemptable,