code: func NewHfscClass(attrs ClassAttrs) *HfscClass {
  	return &HfscClass{
  		ClassAttrs: attrs,
  		Rsc:        ServiceCurve{},
  		Fsc:        ServiceCurve{},
  		Usc:        ServiceCurve{},
  	}
  }
docs: // NewHfscClass returns a new HFSC struct with the set parameters