/** \brief
Force the pointer for the object in store to be a specific pointer.
This can be useful for singleton values.
These usually must be removed from the store explicitly.
\pre No object with this value is already in the store.
*/
void set (std::shared_ptr <Value const> pointer) {
// The value must not be in the store yet.
assert (objects_.find (*pointer,
boost::hash <Value>(), EqualToWeakPtr()) == objects_.end());
objects_.insert (std::move (pointer));
}
// Rvalue reference.
std::shared_ptr <Value const> get (Value && value) {
auto existing = objects_.find (value,
boost::hash <Value>(), EqualToWeakPtr());
if (existing != objects_.end())
return existing->get();
// The value is not in the store yet; insert it.
auto sole = SoleType::construct (*this, std::move (value));
Pointer newElement (sole);
objects_.insert (std::move (newElement));
return sole;
}
bool remap(ID source,ID target) // change ID from source to target
{
// source->target
// target->new id
if(!contains(source))
return false; // remap failed
// find object
Objects::iterator it=objects.find(source);
// get pointer
Object *object=it->second;//objects[source];
// remove
objects.erase(it);
if(contains(target)) // if <target> is valid object -> remap it to new ID
remap(target,generator->generate(getTarget(objects[target])));
objects[target]=object;
// set new ID
object->localID=target;
object->back=objects.find(target);
return true;
}
// called in Stored constructor
// assignes new unique ID and back iterator
virtual ID add(Target * object)
{
assert(generator);
if(!valid(object->id()))
object->localID=generator->generate(object);
else if(contains(object->id()))
{
assert(false);
}
objects.insert(std::make_pair(object->id(),object));
Objects::iterator it=objects.find(object->id());
object->back=it;
onAdd(object); // raise onAdd event.
return object->id();
}
/** \brief
Retrieve the sole object with value \a value.
If an object with this value is already in the store, return a pointer
to that object.
If not, return a pointer to a newly allocated object.
*/
std::shared_ptr <Value const> get (Value const & value) {
auto existing = objects_.find (value,
boost::hash <Value>(), EqualToWeakPtr());
if (existing != objects_.end())
return existing->get();
// The value is not in the store yet; insert it.
auto sole = SoleType::construct (*this, value);
Pointer newElement (sole);
// Note that this insertion involves a mere copy of newElement into
// another place in memory.
// No objects will therefore be deleted, and no objects will
// therefore attempt to remove themselves from the store.
objects_.insert (std::move (newElement));
return sole;
}
bool contains(ID id)
{
return objects.find(id)!=objects.end();
}
void destroy(ID id)
{
Objects::iterator it=objects.find(id);
if(it!=objects.end())
delete it->second;
}
