--- Gregory Colvin <[EMAIL PROTECTED]> wrote:For shared_ptr the count is allocated by the following line in the shared_count constructor:
new sp_counted_base_impl<P, D>(p, d);
So it might be possible to make the allocation customizable by specializing sp_counted_base_impl.
I think it would be great.
Then I suggest giving it a try.
However there is another problem. You have to new your object. shared_ptr<MyClass> s( new MyClass );
You cannot use allocator like you would expect: shared_ptr< MyClass, std::allocator<MyClass> > s;
Right. The shared_ptr design carefully avoids any extra class template parameters, in favor of parameterizing the constructor.
My idea, if it works, would be to specialize sp_counted_base_impl on the pointer type P, e.g. MyClass*, so you just write
shared_ptr<MyClass> s( new MyClass );
or on the deleter type D, so you would write, e.g.
shared_ptr<MyClass> s( new MyClass, MyDeleter<MyAllocator<MyClass>> );
The idea is that your sp_counted_base_impl specialization provides a custom operator new and operator delete that uses your allocator.
Alternatively, we could consider adding shared_ptr constructor that takes an allocator argument.
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