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[backport] pseudorandom probing for hash collision (#13418)

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Timothee Cour 2020-02-19 08:19:55 -08:00 • committed by GitHub
commit 8c22518d67
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12 changed files with 258 additions and 178 deletions
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31
tests/collections/ttables.nim
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@ -8,7 +8,12 @@ And we get here
'''
joinable: false
"""
import hashes, sequtils, tables, algorithm
import hashes, sequtils, tables, algorithm, testutils
block tableDollar:
# other tests should use `sortedPairs` to be robust to future table/hash
# implementation changes
doAssert ${1: 'a', 2: 'b'}.toTable in ["{1: 'a', 2: 'b'}", "{2: 'b', 1: 'a'}"]
# test should not be joined because it takes too long.
block tableadds:
@ -188,6 +193,23 @@ block ttables2:
run1()
echo "2"
block allValues:
var t: Table[int, string]
var key = 0
let n = 1000
for i in 0..<n: t.add(i, $i)
const keys = [0, -1, 12]
for i in 0..1:
for key in keys:
t.add(key, $key & ":" & $i)
for i in 0..<n:
if i notin keys:
t.del(i)
doAssert t.sortedPairs == @[(-1, "-1:0"), (-1, "-1:1"), (0, "0"), (0, "0:0"), (0, "0:1"), (12, "12"), (12, "12:0"), (12, "12:1")]
doAssert sortedItems(t.allValues(0)) == @["0", "0:0", "0:1"]
doAssert sortedItems(t.allValues(-1)) == @["-1:0", "-1:1"]
doAssert sortedItems(t.allValues(12)) == @["12", "12:0", "12:1"]
doAssert sortedItems(t.allValues(1)) == @[]
block tablesref:
const
@ -232,8 +254,8 @@ block tablesref:
for x in 0..1:
for y in 0..1:
assert t[(x,y)] == $x & $y
assert($t ==
"{(x: 1, y: 1): \"11\", (x: 0, y: 0): \"00\", (x: 0, y: 1): \"01\", (x: 1, y: 0): \"10\"}")
assert t.sortedPairs ==
@[((x: 0, y: 0), "00"), ((x: 0, y: 1), "01"), ((x: 1, y: 0), "10"), ((x: 1, y: 1), "11")]
block tableTest2:
var t = newTable[string, float]()
@ -340,7 +362,7 @@ block tablesref:
block anonZipTest:
let keys = @['a','b','c']
let values = @[1, 2, 3]
doAssert "{'c': 3, 'a': 1, 'b': 2}" == $ toTable zip(keys, values)
doAssert zip(keys, values).toTable.sortedPairs == @[('a', 1), ('b', 2), ('c', 3)]
block clearTableTest:
var t = newTable[string, float]()
@ -369,3 +391,4 @@ block tablesref:
orderedTableSortTest()
echo "3"

5
tests/collections/ttablesthreads.nim
View file

@ -3,7 +3,7 @@ discard """
output: '''true'''
"""
import hashes, tables, sharedtables
import hashes, tables, sharedtables, testutils
const
data = {
@ -47,8 +47,7 @@ block tableTest1:
for x in 0..1:
for y in 0..1:
assert t[(x,y)] == $x & $y
assert($t ==
"{(x: 1, y: 1): \"11\", (x: 0, y: 0): \"00\", (x: 0, y: 1): \"01\", (x: 1, y: 0): \"10\"}")
assert t.sortedPairs == @[((x: 0, y: 0), "00"), ((x: 0, y: 1), "01"), ((x: 1, y: 0), "10"), ((x: 1, y: 1), "11")]
block tableTest2:
var t = initTable[string, float]()