Re: [lex][boost 1.44] 2 oddities

> That seems to be a cut&paste error. It's fixed in SVN (and I added a couple
> of missing specializations while I was at it as well).

Great!  Thanks.

>> Oddity #2:  It seems that I have to define
>> assign_to_attribute_from_iterators<> for new types, even if I define a
>> semantic action that does the assignment.
>
> Yes, that's true. It's the only way the lexer could know how to convert a
> certain input character sequence into your type. Or do I misunderstand
> something?

No, I was just making sure that *my* understanding of that was correct.

>> This further means that any
>> semantic action [_val = ...] is useless, because the conversion will
>> happen later and overwrite the token's value anyway, right?
>
> Hmmm, I think these two things are unrelated. The conversion from the input
> iterators to your type is one thing, while the assignment inside the
> semantic action is another one. Could you elaborate why you believe the
> semantic action to be useless?

To me, the fact that they are unrelated leads to some slightly wonky
behavior.  For instance if I:

(1) define an assignment to the token value in a semantic action,
(2) I still have to specialize assign_to_attribute_from_iterators<>,
which is fine, except that
(3) my specialization of assign_to_attribute_from_iterators<> gets
invoked at parse-time, overwriting the assignment I did at lex-time
(1).

Am I misunderstanding how it works?  That was the behavior I saw, if
I'm not mistaken.

Zach

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