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From: Joel de Guzman (joel_at_[hidden])
Date: 2007-11-21 21:13:00

shunsuke wrote:
> Joel de Guzman wrote:
>> shunsuke wrote:
>>> Hi,
>>> I'm trying to fix ticket #1396:
>>> Any hint?
>> I just replied to that in the ticket :-) HTH.
> Hmm, your `identity` implementation seems wrong.
> `result<Fun(int)>` invocation means that the argument is rvalue
> by the definition of result_of behavior.
> Therefore, you can't return mutable reference to `int`.

Well, it's just for that specific case. Did you intend the
transform to be generic? I didn't think so when you had
it hard coded to int. I guess, it really depends on what
your intent is. A transform cannot, in general, return a
reference. What if the input is computed on the fly,
like, say:

     mpl::vector_c<int, 1, 2, 3>



Joel de Guzman

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