Further optimization of PackedColumnStorage when get entities_with_components?

[vrecluse]

Is optimization like this possible?

auto& column = getSmallestSizeColumn<Components...>();
for (auto& component in column)
{
   auto entity = getEntity(component)
   if (entity.Contains<Components...>()) { f(entity, cs...); }
}

When finding entities_with_components, iterate over the smallest size column to find entities instead of iterate all entities should get performance benefits when some components rarely exist.