[Issue 4475] Improving the compiler 'in' associative array can return just a bool

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=4475



--- Comment #12 from bearophile_hugs at eml.cc 2013-08-15 12:52:19 PDT ---
(In reply to comment #11)

> the hash table itself doesn't contain the
> actual key/value pairs; it just contains pointers to linked-lists of these
> key/value pairs. So the hash table can be modified however you like, but the
> key/value pairs stays in the same memory address.

I see. But that's just an implementation detail (you could design an AA that
keeps small keys-value pairs in an array, plus a pointer to a chain for the
collisions, this is how I have created associative arrays in C), D specs can't
assert that implementation, so D code that relies on that implementation detail
goes into the realm of undefined behavour.

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