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add enumutils.items for sparse enums, typetraits.SomeSparseEnum (#17080)

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* add enumutils.items for enum with holes
* changelog
* ref in lib.rst
* use `type SomeSparseEnum* = (not Ordinal) and enum` instead of concept
* address comment: rename back to enum with holes
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Timothee Cour 2021-02-23 11:25:35 -08:00 • committed by GitHub
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9
lib/system/iterators.nim
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@ -82,8 +82,13 @@ iterator mitems*(a: var cstring): var char {.inline.} =
yield a[i]
inc(i)
iterator items*[T: enum](E: typedesc[T]): T =
## Iterates over the values of the enum ``E``.
iterator items*[T: enum and Ordinal](E: typedesc[T]): T =
## Iterates over the values of `E`.
## See also `enumutils.items` for enums with holes.
runnableExamples:
type Goo = enum g0 = 2, g1, g2
from std/sequtils import toSeq
assert Goo.toSeq == [g0, g1, g2]
for v in low(E) .. high(E):
yield v