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POBoost Spirit Rule's assignment operator
 

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  1. POBoost Spirit Rule's assignment operator
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    <p>this is my first time asking a question here. It has already taken me a lot of time and research to get this working and I can't. I really hope you can help me with it. I am a newbie using Spirit, I do not fully understand all the terms; however, even after reading tons of articles and posts I do not know what am I missing.</p> <p>So, I have the following struct and class in a header file.</p> <pre><code>typedef std::string::const_iterator iterator_type; struct GrammarRules { qi::rule&lt;iterator_type, ascii::space_type&gt; create_char; }; class Parser { public: Parser(); bool parse(std::string const&amp; to_parse); private: GrammarRules rules_; gtor::World * world_; }; </code></pre> <p>Then I have the following in the .cpp file:</p> <pre><code>Parser::Parser() : rules_() , world_(nullptr) { world_ = new gtor::World(); qi::rule&lt;iterator_type, std::string(), ascii::space_type&gt; qg_string; qg_string %= qi::lexeme[ +(ascii::alnum) ]; rules_.create_char = ( qi::lit("CreateChar") &gt;&gt; '(' &gt;&gt; qg_string &gt;&gt; ',' &gt;&gt; qg_string &gt;&gt; ',' &gt;&gt; qi::int_ &gt;&gt; ')' ) [ phx::bind(&amp;gtor::World::createCharacter, world_, qi::_1, qi::_2, qi::_3) ] ; } ... bool Parser::parse(std::string const&amp; to_parse) { iterator_type it = to_parse.begin(); iterator_type end = to_parse.end(); bool success = qi::phrase_parse(it, end, rules_.create_char, ascii::space); /*qi::rule&lt;iterator_type, std::string(), ascii::space_type&gt; qg_string; qg_string %= qi::lexeme[ +(ascii::alnum) ]; qi::rule&lt;iterator_type, ascii::space_type&gt; create_char1 = ( qi::lit("CreateChar") &gt;&gt; '(' &gt;&gt; qg_string &gt;&gt; ',' &gt;&gt; qg_string &gt;&gt; ',' &gt;&gt; qi::int_ &gt;&gt; ')' ) [ phx::bind(&amp;gtor::World::createCharacter, world_, qi::_1, qi::_2, qi::_3) ] ; bool success = qi::phrase_parse(it, end, create_char1, ascii::space);*/ if (success &amp;&amp; it == end) return true; return false; } </code></pre> <p>The code which is not commented on the <code>parse()</code> method doesn't work, I get an <code>Access Violation</code> as soon as the parser gets to the <code>qg_string</code> rule. However, the code that is commented works perfectly. It looks exactly the same to me, except for the obvious differences. Maybe I am missing something very obvious, but I am unable to find it.</p> <p>It already took me a lot to find that my code worked if I used everything as local variables. And still can't find the problem.</p> <p>Thank you in advance for any help. Sorry if there are any mistakes in the post (5AM).</p>
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    1. COI solved it by adding the `qg_string` rule to the structure. Although I do not fully understand why that solved it. Any hints will be greatly appreciated.
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