Re: X3 problem

Hi!

Thanks for your answer! I made a new example with using a rule as you suggested, but that doesn't work either...

http://coliru.stacked-crooked.com/a/990cbbaf3551d072

( Doesn't work even if I make it non-optional:  http://coliru.stacked-crooked.com/a/8ded10bcf9d4db41 )

#include <iostream>
#include <string>
#include <vector>
#include <boost/spirit/home/x3.hpp>
#include <boost/optional.hpp>
#include <boost/fusion/include/adapt_struct.hpp>

using std::string;
using std::vector;
using std::pair;

namespace x3 = boost::spirit::x3;

int parse_input(vector<string> v);

int main(int argc, const char* argv[]) {
    if (argc > 1) {
      return parse_input(vector<string>(&argv[1], &argv[argc + !argc]));
    }
    return 1;
}

struct XXX {
  int a;
  boost::optional<pair<int, int>> b;
};

BOOST_FUSION_ADAPT_STRUCT(XXX, a, b)

class apair_class;
using apair_type = x3::rule<apair_class, std::pair<int, int>>;
const apair_type apair = "pair";
const auto apair_def = x3::int_ >> x3::int_;

int parse_input(vector<string> v) {
  std::stringstream ss;
  std::copy(v.begin(), v.end(), std::ostream_iterator<string>(ss, " "));
  string s = ss.str();
  auto iter = s.begin();
  auto end = s.end();
  XXX x;
  bool success = x3::phrase_parse(iter, end, x3::int_ >> -apair, x3::space, x);
  return !success;
}

BOOST_SPIRIT_DEFINE(apair)


-----Original Message-----
From: Joel de Guzman [mailto:[email protected]] 
Sent: Wednesday, March 9, 2016 00:47
To: [email protected]
Subject: Re: [Spirit-general] X3 problem

On 08/03/2016 6:23 AM, Mikael Asplund wrote:
> Hi!
>
> I really can't figure out what's wrong with this... Can anyone figure out what's wrong?
> Using boost 1.60.
>
> It seem to be exactly as prescribed, and the error messages that X3 
> produce are less then
> helpful:
>
> http://coliru.stacked-crooked.com/a/5c128d4f02379eb8
>
[...]

Looks like a bug. I'll have to investigate deeper. For now, please use a separate rule for the optional part.

Regards,
--
Joel de Guzman
http://www.ciere.com
http://boost-spirit.com
http://www.cycfi.com/


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