ref semantics with hashes

[H. S. Teoh]

On Wed, May 02, 2012 at 09:38:35PM +0200, Andrej Mitrovic wrote:
[...]
> So if the hash wasn't already initialized then the reference in the
> Foo struct is a reference to null, and if you duplicate that reference
> and add a key the old reference still points to null.
> 
> The only way to ensure a proper link with a hash is to initialize it
> with a key and then immediately remove that key, which makes the hash
> not-null but empty:
[...]
> Why do we have such error-prone semantics?

I was told that this was expected behaviour.

Should the new AA implementation change this, so that it always
allocates an empty AA upon instantiation?


T

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