On 12/12/2013 15:24, TONGARI J wrote: Hi TJ,
Thanks for this fast answer.
The problem is (at least what I see): your key_rule/value_rule have no attribute, so qi::_1 eventually evaluates to nothing (i.e. unused_type). To give them attr, for example:
boost::spirit::qi::rule<std::__string::iterator, std::vector<char>()> key_rule;
I have added to second template attribute for rules and it works ! <pre> boost::spirit::qi::rule<std::string::iterator, std::vector<char>()> key_rule = +(char_ - '='); boost::spirit::qi::rule<std::string::iterator, std::vector<char>()> value_rule = lexeme[+(char_ - ';')]; bool r = phrase_parse( strbegin, s.end(), key_rule[boost::phoenix::ref(vkey) = boost::spirit::qi::_1 ] >> '=' >> *space >> value_rule[boost::phoenix::ref(vvalue) = boost::spirit::qi::_1 ], space ); </pre> However I don't understand the "()" after the "std::vector<char>". what does it mean ? Does it refer to the std::vector constructor ? Also I have implemented the following to play directly with std::strings and not use temporary vectors of char anymore: <pre> boost::spirit::qi::rule<std::string::iterator, std::string()> key_rule = as_string[+(char_ - '=')]; boost::spirit::qi::rule<std::string::iterator, std::string()> value_rule = as_string[lexeme[+(char_ - ';')]]; std::string key; std::string value; bool r = phrase_parse( strbegin, s.end(), key_rule[boost::phoenix::ref(key) = boost::spirit::qi::_1 ] >> '=' >> *space >> value_rule[boost::phoenix::ref(value) = boost::spirit::qi::_1 ], space ); </pre> Guess what... it works... obviously. Many thanks for the fix.
And I'd suggest using attr propagation instead of the explicit semantic action if possible.
Thanks you for the suggestion but I'm afraid I don't understand that much what you speak about !!! ;-| I just had a quick look at this article: http://boost-spirit.com/home/articles/attribute_handling/attribute-propagati... but I need more time to allow this science to percolate in my brain (if possible!). Do you mean I should discard "...[boost::phoenix::ref(...) = ...]" stuff in my rules and use a "sink" data structure (some kind of fusion "container") <pre> Foo bar; bool r = phrase_parse( strbegin, s.end(), my_rule, bar); </pre> where Foo could be a sort of tuple aggregating more basic attributes ? Maybe can you show me an URL where I will find some "simple" code snippet... I'm ready to RTFM but first I should find it (at least the right one... there are so many confusing informations about Spirit for a newbie). Thanks. Best frc -- François Mauger