Le 14 août 2012 à 09:09, Vincent Habchi vi...@macports.org a écrit :
Le 13 août 2012, à 23:47, Mike Abdullah cocoa...@mikeabdullah.net scripsit:
An idea I've vaguely wondered about would be turning the isa variable into a
tagged pointer. If you know nothing is accessing it directly (to do
On 16 août 2012, at 03:11, Britt Durbrow
bdurb...@rattlesnakehillsoftworks.com wrote:
objects must be 16-byte aligned - and that alignment requirement isn't likely
to go down, but rather up in the future; using the low bits doesn't really
cause the same issue that using the high bits did.
On Aug 16, 2012, at 4:37 AM, Vincent Habchi vi...@macports.org wrote:
On 16 août 2012, at 03:11, Britt Durbrow
bdurb...@rattlesnakehillsoftworks.com wrote:
objects must be 16-byte aligned - and that alignment requirement isn't
likely to go down, but rather up in the future; using the low
Le 13 août 2012, à 23:47, Mike Abdullah cocoa...@mikeabdullah.net scripsit:
An idea I've vaguely wondered about would be turning the isa variable into a
tagged pointer. If you know nothing is accessing it directly (to do so was
deprecated with the modern runtime), then, say, the last 4 bits
On 13 Aug 2012, at 16:56, Kyle Sluder k...@ksluder.com wrote:
On Aug 13, 2012, at 8:42 AM, Ben ben_cocoa_dev_l...@yahoo.co.uk wrote:
I see in the documentation - and from a compiler error - that some classes
are not compatible with weak references.
What makes these classes incompatible?
Ahh the Atari ST… Now those are fond memories indeed…
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www.sunsetmagicwerks.com
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On Aug 14, 2012, at 12:09 AM, Vincent Habchi wrote:
Le 13 août 2012, à 23:47, Mike Abdullah cocoa...@mikeabdullah.net scripsit:
An idea I've vaguely
On Tue, Aug 14, 2012, at 12:09 AM, Vincent Habchi wrote:
Using part of pointer to do something else than record an address is
perilous.
NSNumber does exactly that on 10.7 and higher. Tagged pointers are a
well-understood technique.
You just have to be careful not to dereference them directly.
On Aug 14, 2012, at 2:09 AM, Vincent Habchi vi...@macports.org wrote:
Le 13 août 2012, à 23:47, Mike Abdullah cocoa...@mikeabdullah.net scripsit:
An idea I've vaguely wondered about would be turning the isa variable into a
tagged pointer. If you know nothing is accessing it directly (to do
That exists already in Lion with NSNumber objects: some types of pointers to
NSNumbers actually use the low bits of the pointer to indicate the type and the
rest of the pointer to pack the value; resulting in not needing to actually
allocate an object off the heap (which is why direct isa
I see in the documentation - and from a compiler error - that some classes are
not compatible with weak references.
What makes these classes incompatible?
Perhaps I'm using the wrong search terms, but I can't seem to find information
on why this should be the case. Can anyone shed some light
On Aug 13, 2012, at 8:42 AM, Ben ben_cocoa_dev_l...@yahoo.co.uk wrote:
I see in the documentation - and from a compiler error - that some classes
are not compatible with weak references.
What makes these classes incompatible?
They have custom implementations of -retain and -release.
When
Le 13 août 2012 à 17:56, Kyle Sluder k...@ksluder.com a écrit :
On Aug 13, 2012, at 8:42 AM, Ben ben_cocoa_dev_l...@yahoo.co.uk wrote:
I see in the documentation - and from a compiler error - that some classes
are not compatible with weak references.
What makes these classes
On Aug 13, 2012, at 9:29 AM, Jean-Daniel Dupas wrote:
Le 13 août 2012 à 17:56, Kyle Sluder k...@ksluder.com a écrit :
On Aug 13, 2012, at 8:42 AM, Ben ben_cocoa_dev_l...@yahoo.co.uk wrote:
I see in the documentation - and from a compiler error - that some classes
are not compatible with
Le 13 août 2012 à 19:54, John McCall rjmcc...@apple.com a écrit :
On Aug 13, 2012, at 9:29 AM, Jean-Daniel Dupas wrote:
Le 13 août 2012 à 17:56, Kyle Sluder k...@ksluder.com a écrit :
On Aug 13, 2012, at 8:42 AM, Ben ben_cocoa_dev_l...@yahoo.co.uk wrote:
I see in the documentation - and
On Mon, Aug 13, 2012, at 11:30 AM, Jean-Daniel Dupas wrote:
Thanks for the details. I know what the fragile ABI, and the modern ABI
are but where I don't agree is when Kyle says that it was not possible to
add a refcount ivar when retain/release was introduced. As retain/release
was already
On 13 Aug 2012, at 19:30, Jean-Daniel Dupas devli...@shadowlab.org wrote:
Le 13 août 2012 à 19:54, John McCall rjmcc...@apple.com a écrit :
On Aug 13, 2012, at 9:29 AM, Jean-Daniel Dupas wrote:
Le 13 août 2012 à 17:56, Kyle Sluder k...@ksluder.com a écrit :
On Aug 13, 2012, at 8:42 AM,
On Mon, Aug 13, 2012, at 02:47 PM, Mike Abdullah wrote:
An idea I've vaguely wondered about would be turning the isa variable
into a tagged pointer. If you know nothing is accessing it directly (to
do so was deprecated with the modern runtime), then, say, the last 4 bits
of the pointer could
On Aug 13, 2012, at 9:29 AM, Jean-Daniel Dupas devli...@shadowlab.org wrote:
Le 13 août 2012 à 17:56, Kyle Sluder k...@ksluder.com a écrit :
On Aug 13, 2012, at 8:42 AM, Ben ben_cocoa_dev_l...@yahoo.co.uk wrote:
I see in the documentation - and from a compiler error - that some classes
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