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Add hash proc for cstrings (#5386)

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This commit is contained in:
Ruslan Mustakov 2017-02-13 19:38:30 +07:00 • committed by Andreas Rumpf
commit 92665e6e9a
2 changed files with 15 additions and 1 deletions
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10
lib/pure/hashes.nim
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@ -127,6 +127,15 @@ proc hash*(x: string): Hash =
h = h !& ord(x[i])
result = !$h
proc hash*(x: cstring): Hash =
## efficient hashing of null-terminated strings
var h: Hash = 0
var i = 0
while x[i] != 0.char:
h = h !& ord(x[i])
inc i
result = !$h
proc hash*(sBuf: string, sPos, ePos: int): Hash =
## efficient hashing of a string buffer, from starting
## position `sPos` to ending position `ePos`
@ -239,6 +248,7 @@ proc hash*[A](x: set[A]): Hash =
when isMainModule:
doAssert( hash("aa bb aaaa1234") == hash("aa bb aaaa1234", 0, 13) )
doAssert( hash("aa bb aaaa1234") == hash(cstring("aa bb aaaa1234")) )
doAssert( hashIgnoreCase("aa bb aaaa1234") == hash("aa bb aaaa1234") )
doAssert( hashIgnoreStyle("aa bb aaaa1234") == hashIgnoreCase("aa bb aaaa1234") )
let xx = @['H','e','l','l','o']