[Proto] Accessing nary_expr tag in transform
I have a nary_expr grammar rule and in its associated tranform, I want
to retrieves the actual tag.
when< nary_expr<_ , bp::vararg
Joel Falcou wrote:
I have a nary_expr grammar rule and in its associated tranform, I want to retrieves the actual tag.
when< nary_expr<_ , bp::vararg
> , some_transform_using_the_tag(bp::_tag) > obviously proto::_tag doesn't exist. How can I retrieve this information ?
Well, there isn't a tag object, just a tag type. To get the tag's type in a transform, you can use proto::tag_of<_>. If you want a default-constructed object of that type, use proto::tag_of<_>(). HTH, -- Eric Niebler BoostPro Computing http://www.boostpro.com
participants (2)
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Eric Niebler
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Joel Falcou