[Issue 8408] Purity calculation should be improved

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=8408



--- Comment #3 from Kenji Hara <k.hara.pg at gmail.com> 2012-09-09 07:24:46 PDT ---
(In reply to comment #2)
> This rule makes more functions (tagged as pure) become strongly pure, this is
> positive.

Thanks. But, I've been filed this as a part of issue 8409, so the pull request
doesn't cover all cases.

> On the other hand for the programmer it's increasingly harder to know if a
> function is weak pure or strongly pure just looking at it.

I think it is not so difficult if you summarize it.

- If the function can modify function argument through its parameters, it is
weakly pure.

- If the function arguments don't appear in the part of the returned value, or
the returned value is not a part of arguments, then it is strongly pure.

- Otherwise, it is constant pure.

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