[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 #8 from bearophile_hugs at eml.cc 2012-01-08 06:47:39 PST ---
(In reply to comment #7)

> I don't see why pointers are so bad. While, yes, D is a high-level language, it
> is not C# or Java.

Pointers are not evil, but they are usually more bug-prone. An example from
simendsjo:

http://www.digitalmars.com/webnews/newsgroups.php?art_group=digitalmars.D.learn&article_id=31482

> aa["a"] = new C();
> auto c = "a" in aa;
> aa["b"] = new C();
> // Using c here is undefined as an element was added to aa

This can't happen if "in" returns a bool.

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