virtual bool operator==(Structure const& rhs) const
{
return id_ == rhs.id();
}
// virtual bool operator==(Structure<typename Ttraits_::world_type::traits_type> const& rhs) const
virtual bool operator==(Structure<Ttraits_> const& rhs) const
{
BasicSurfaceImpl const* _rhs(dynamic_cast<BasicSurfaceImpl const*>(&rhs));
return _rhs && base_type::id_ == rhs.id() && shape_ == _rhs->shape();
}