Re: Design/structure X3 parser more like Qi parser

Hi,

> I think this is the problem described here:
> http://boost.2283326.n4.nabble.com/x3-devel-why-2-methods-linking-rule-to-RHS-tp4688021.html
> which is another reason, besides the assumed compile time penalty, for using BOOST_SPIRIT_DEFINE.

yes, it covers this topic, too (btw interesting post). In order to write such recursive parsers, in general one has to use BOOST_SPIRIT_DEFINE, yet by doing so the parser has to be defined in a namespace (at least with the current version of BOOST_SPIRIT_DEFINE).

> I've updated the code to use an Ops template parameter to the calc1_gram::gram_deriv:
> https://github.com/cppljevans/spirit/blob/ExagonLinkingError/workbench/x3/rule_defns/parse_rule_crtp.cpp#L160
> The Ops parameter shows how to change the character use for the arithmetic operators somewhat like the main_x3's make_csv_parser's fieldSep argument.
> That method is not as "clean" as passing a runtime parameter thru the argument list, but it's close.

Yeah, good idea. Seth did something for the CSV parser, too.
 
> I failed to find documentation for the x3::with; hence, I couldn't try that.  I even tried grepping the source code; however, all I found was names beginning with with_ but no x3::with.
> That was with boost_1_61_0.  Do you know where I could find examples or documentation of x3::with?

Currently it's not contained in the documentation. I can offer you another example, my CSV parser in the X3 variant (main_x3.cpp), to be found as attachement in this previous mail: https://sourceforge.net/p/spirit/mailman/message/35546745/

Best regards,
Sandro

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