Re: Seeding random() randomly
Re: Seeding random() randomly
- Subject: Re: Seeding random() randomly
- From: Graham Cox <email@hidden>
- Date: Fri, 27 May 2011 11:54:12 +1000
Weird.
Setting a breakpoint on srandom, setstate or srandomdev never triggers except for my own call of it. Using srandomdev doesn't change anything.
Switching to arc4random() gives me a varying random sequence, so that's a usable solution to my problem. But the behaviour with random() I'm seeing is mysterious.
--Graham
On 27/05/2011, at 11:15 AM, Dave Keck wrote:
>> I'm using random(), but every time I run my app I get the same sequence, despite having this code in my app delegate's -appDidFinishLaunching method. Clearly I'm not seeding it right, though I can't see why - I get a different value for seed every time. What gives?
>>
>>
>> unsigned seed = (unsigned)([NSDate timeIntervalSinceReferenceDate] * 10000.0);
>>
>> NSLog(@"launched, seed = %ld", seed );
>> srandom( seed );
>
> I'm not sure what your problem is, but I believe arc4random() has
> superseded random() for a while now.
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