On 12/05/07 21:23, Joel de Guzman wrote:
Larry Evans wrote: [snip]
A prototype of such an extension is available in variant_tagged.zip here:
http://www.boost-consulting.com/vault/index.php?&directory=Data%20Structures
Use of the variant_tagged could be used whenever non-string processing is required in a spirit parser. Each tag in the using corresponds to a token-id and each value associated with that token-id is the attribute for that token-id. This closely emulates the way yacc does it, IIRC, except it just uses a union and the tag is somehow "implicit".
Is there any interest in using this in spirit or boost in general?
There's definitely interest in Spirit :-) Thanks for your work on this. Very useful. Thanks for the feedback. However, I've thought about it some more and I think maybe the original variant with fusion::pair's as the template arguments would work as well and would avoid the duplication of the tag (variant::which() and variant_taggged:tag()).