flagset

flagset, data type

The flagset data type is supported by Envision:

a = flag(1) // {1}
b = union(a, flag(2)) // {1,2}
c = intersection(b, flag(2)) // {2}
show summary "" with a, b, c

Under the hood, the flagset is implemented as uint64 values.

The keyword flagset appears in user-defined functions:

def pure set42(f : flagset) with
  return union(f, flag(42))

show scalar "" with set42(flag(13)) // {13, 42}

and in read blocks:

read "/sample.csv" as Sample with
  MyFlagset : flagset