Nim/tests/generics/texplicitgeneric1.nim

discard """
  output: "Key: 12 value: 12Key: 13 value: 13 Key: A value: 12 Key: B value: 13"
"""
# test explicit type instantiation

type
  TDict*[TKey, TValue] = object
    data: seq[tuple[k: TKey, v: TValue]]
  PDict*[TKey, #with `==`(a, b: TKey): bool
               #     hash(a: TKey): int,
         TValue] = ref TDict[TKey, TValue]

proc newDict*[TKey, TValue](): PDict[TKey, TValue] =
  new(result)
  result.data = @[]

proc add*[TKey, TValue](d: PDict[TKey, TValue], k: TKey, v: TValue) =
  d.data.add((k, v))

iterator items*[Tkey, TValue](d: PDict[TKey, TValue]): tuple[k: TKey,
               v: TValue] =
  for k, v in items(d.data): yield (k, v)

var d = newDict[int, string]()
d.add(12, "12")
d.add(13, "13")
for k, v in items(d):
  stdout.write("Key: ", $k, " value: ", v)

var c = newDict[char, string]()
c.add('A', "12")
c.add('B', "13")
for k, v in items(c):
  stdout.write(" Key: ", $k, " value: ", v)

stdout.write "\n"