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From: Peter Dimov (pdimov_at_[hidden])
Date: 2005-06-01 05:58:48

Alexander Terekhov wrote:
> Maksym Motornyy wrote:
>> Thanks for articles. Well, I understand that multithreaded
>> environment can be a bad place for COW optimization.
> That's a myth.

It depends on the interface of the class. Returning pointers and references
into the object is bad, as is const/non-const overloading where the
non-const version can be used for read access.

Non-const member functions of the begin()/end() variety are worse than just
returning a single reference into the object, because you can't "copy on
write" between the two, or they'll get out of sync.

Reference-counting immutable objects is fine, but COW can be a pain.

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