public VHDLPhysicalType(Int64 left, Int64 right, RangeDirection direction)
 {
     defPhysicalType = this;
     Range           = new PhysicalRange <T>(left, right, direction);
 }
 public VHDLPhysicalType()
 {
     defPhysicalType = this;
     Range           = new PhysicalRange <T>();
 }
 public VHDLPhysicalType(PhysicalRange <T> range)
 {
     defPhysicalType = this;
     Range           = range;
 }