On 10/30/05 2:51 PM, Lawrence Sanbourne didst favor us with:
> On 10/30/05, Laurence Harris <email@hidden> wrote:
>> On 10/30/05 1:28 AM, Lawrence Sanbourne didst favor us with:
>>
>>>> A few thoughts:
>>>>
>>>> - The CFArray approach doesn't seem very efficient since for each directory
>>>> you add to the array you have to create a CFDataRef, and then later in the
>>>> same function reverse the process by calling CFDataGetBytes.
>>>
>>> This is my way of copying the FSRefs. I have to copy them instead of
>>> storing their memory addresses because they are in the array, which I
>>> keep reusing during the loop. This was the cause of the error I wrote
>>> to carbon-dev about originally.
>>
>> I had a feeling it might be something like that, which is why I originally
>> suggested using something that didn't involve CF.
>
> Do the STL stacks, vectors, and other collections automatically copy
> the memory referenced by a pointer? This would surprise me.
No, but as David says, and as I pointed out in a couple of previous posts,
my stack stores the FSRef's 80-byte struct, not pointers to FSRefs. There
are no allocations or deallocations.
>>> The STL is software, just as Core Foundation is.
>>
>> True, but what evidence do you have that CF is faster?
>
> I know CF is "faster" only in that I don't have to rewrite anything!
Fine.
>> In any case, don't get fixated on STL. If you don't like or want to use STL,
>> that's fine. It would be simple enough to write code for an efficient stack
>> that would do the same thing. You're just storing a bunch of 80-byte structs.
>> Nothing is going to be more efficient than copying them to or reading from
>> slots in an array.
>>
>> My code:
>>
>> folderStack.push_back( fsRefArray[ idx ] );
>
> This code (internally) still has to allocate some new memory, use copy
> the stuff at the FSRef * to it.
No, as I've said repeatedly, all it does is copy 80 bytes to an offset in an
array.
> So, I'm well aware of the convenience of the STL, but I have no reason
> to believe it's faster than CF.
Fine. I think you should forget everything I've said and use your code just
the way it is.
Larry
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