Re: Why does Swift crash my CFBitVector ?
Re: Why does Swift crash my CFBitVector ?
- Subject: Re: Why does Swift crash my CFBitVector ?
- From: "Clark S. Cox III" <email@hidden>
- Date: Mon, 07 Jul 2014 10:06:04 -0700
On Jul 6, 2014, at 02:14, Gerriet M. Denkmann < email@hidden> wrote:
class CrashVector
{
let lengthInBits : CFIndex = 133 // must be > 128
let badIndex : CFIndex = 129 // 128 ≤ badIndex < lengthInBits
func makeCrash()
{
let bitVector = CFBitVectorCreateMutable( kCFAllocatorDefault, lengthInBits )
let bitCount = CFBitVectorGetCount( bitVector )
println("got BitVector with \(bitCount) bits") // why does it say 0 instead of 133 ?
Because you’ve just set the *capacity* to 133, not the actual size. println("makeCrash will set bit \(badIndex) in BitVector of size \(lengthInBits)") // why does this crash ?
CFBitVectorSetBitAtIndex( bitVector, badIndex, 1 )
Why would you expect this to work? The documentation clearly states: "The index must be in the range 0…N-1, where N is the count of the vector.”
}
}
What am I doing wrong?
You’re trying to set a bit at a bad index. |
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