Hey, I want to use an iterator as argument for a function. I know, that
iterators cant be passed around, and they need to be wrapped in functions.
However, I cant get it to work. I something like this:
import tables, sugar
type Iterable[T] = proc: iterator: T
proc iterSomething(xs: Iterable[int])=
for x in xs()():
echo x
let dict = toTable {1:2, 3:4}
iterSomething(() => dict.values)
Run
which will produce the following error:
Error: undeclared field: 'values'
found 'tables.values(t: OrderedTableRef[values.A, values.B]) [declared in
/home/felix/.choosenim/toolchains/nim-1.4.0/lib/pure/collections/tables.nim(2118,
10)]' of kind 'iterator'
found 'tables.values(t: CountTable[values.A]) [declared in
/home/felix/.choosenim/toolchains/nim-1.4.0/lib/pure/collections/tables.nim(2529,
10)]' of kind 'iterator'
found 'tables.values(t: OrderedTable[values.A, values.B]) [declared in
/home/felix/.choosenim/toolchains/nim-1.4.0/lib/pure/collections/tables.nim(1710,
10)]' of kind 'iterator'
found 'tables.values(t: CountTableRef[values.A]) [declared in
/home/felix/.choosenim/toolchains/nim-1.4.0/lib/pure/collections/tables.nim(2805,
10)]' of kind 'iterator'
found 'tables.values(t: Table[values.A, values.B]) [declared in
/home/felix/.choosenim/toolchains/nim-1.4.0/lib/pure/collections/tables.nim(708,
10)]' of kind 'iterator'
found 'tables.values(t: TableRef[values.A, values.B]) [declared in
/home/felix/.choosenim/toolchains/nim-1.4.0/lib/pure/collections/tables.nim(1136,
10)]' of kind 'iterator'
Run
I don't really understand how this error comes to be. How can I pass arbitrary
iterators without converting them to a sequence?
