gistfile1.nim

## Store multiple "bool" values in an integer
# http://blog.millermedeiros.com/using-integers-to-store-multiple-boolean-values/
type foos = enum 
  foo = 1.shl 0, # 1 
  baa = 1.shl 1, # 2
  baz = 1.shl 2  # 4

echo foo.int
echo baa.int
echo baz.int

let fooAndBaa = foo.int or baa.int # compose an option 
echo "fooAndBaa: ", fooAndBaa
assert (fooAndBaa.int and foo.int) > 0 == true
assert (fooAndBaa.int and baa.int) > 0 == true
assert (fooAndBaa.int and baz.int) > 0 == false

let fooAndBaaAndBaz = fooAndBaa.int or baz.int # add another option to the int
assert (fooAndBaaAndBaz.int and foo.int) > 0 == true
assert (fooAndBaaAndBaz.int and baa.int) > 0 == true
assert (fooAndBaaAndBaz.int and baz.int) > 0 == true

let fooAndBaz = fooAndBaaAndBaz.int xor baa.int # remove an option from the int
assert (fooAndBaz.int and foo.int) > 0 == true
assert (fooAndBaz.int and baa.int) > 0 == false
assert (fooAndBaz.int and baz.int) > 0 == true