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take/takeWhile iterators for Counttables #13428

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take/takeWhile iterators for Counttables #13428

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9870cbf
adds take iterator to CountTable.
mkohlhaas Feb 17, 2020
c437132
adds take and takeWhile to CountTable.
mkohlhaas Feb 18, 2020
f8c5064
adds take and takeWhile to CountTable.
mkohlhaas Feb 18, 2020
48cb412
adds take and takeWhile to CountTable.
mkohlhaas Feb 18, 2020
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22 changes: 22 additions & 0 deletions lib/pure/collections/tables.nim
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Original file line number Diff line number Diff line change
Expand Up @@ -2619,6 +2619,28 @@ iterator mvalues*[A](t: var CountTable[A]): var int =
yield t.data[h].val
assert(len(t) == L, "the length of the table changed while iterating over it")

iterator take*[A](t: CountTable[A], n: Natural): (A, int) =
let L = len(t)
var n = n
for h in 0 .. high(t.data):
if n == 0: break
if t.data[h].val != 0:
dec n
yield (t.data[h].key, t.data[h].val)
assert(len(t) == L, "the length of the table changed while iterating over it")

iterator takeWhile*[A](t: CountTable[A], fn: proc(key: A, val: int): bool): (A, int) =
let L = len(t)
for h in 0 .. high(t.data):
let
key = t.data[h].key
val = t.data[h].val
if val != 0:
if fn(key, val):
yield (key, val)
assert(len(t) == L, "the length of the table changed while iterating over it")
else: break




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