Collection* generate() {
CollectionType *result = new CollectionType(numa::util::MmapAllocator<T>(thisBase()->from()));
result->reserve(thisBase()->elements());
for (int i = 0; i < thisBase()->elements(); i++) {
result->push_back(thisBase()->construct());
}
return new Collection(result);
}
void migrate(Collection *c) {
// build new collection, with newly constructed members
CollectionType *newcol = new CollectionType(numa::util::MmapAllocator<T>(thisBase()->to()));
CollectionType &old = **c;
newcol->reserve(old.size());
for (size_t i = 0; i < old.size(); i++) {
newcol->push_back(T(old[i]));
}
delete *c;
*c = newcol;
}