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From: Larry Evans (cppljevans_at_[hidden])
Date: 2008-04-27 15:56:05

On 04/27/08 06:01, Larry Evans wrote:
> On case where this would be
Should read "one use case"
> useful is for algebraic morphisms where n-ary ops in a
> source algebra are mapped to n-ary ops in a target algebra.
> This *includes* 0-ary ops. An op would be the equivalent
> to proto tags. I think this could be done by another
> transform similar to the pass_through transform but
> allowing transformation of the tag.
The attached compiles and runs an does this algebraic
type morphism. Maybe one thing about the attachment
is that it requires proto::expr CTOR's to be specialized
to allow the mapping. Also, I'm wondering whether
using something other than tag::terminal for 0-ary
args, i.e. args0, will lead to problems.

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