using enums for flags

[Marco Leise]

Delphi: http://delphi.about.com/od/beginners/a/delphi_set_type.htm |  
Scroll to: "Sets with Enumerations"
Sets use the smallest integer type that can hold enough bits for the  
number of elements in an enum. So up to 8 enum flags use a byte for  
example. TDaySet in the example code would also be 1 byte in size. As the  
syntax suggests they don't implicitly convert forth or back to integers.