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POboost::qi::parse seems to cause compilation errors
 

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  1. POboost::qi::parse seems to cause compilation errors
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    <p>I'm trying to write a parser using Boost::Spirit, and I have the parser written and compiling. The problem is, when I try to compile the parsing function, the compiler throws out a bunch of template errors. Here's the Qi grammar:</p> <pre><code>template&lt;typename Iterator&gt; struct etf_parser : qi::grammar&lt;Iterator, std::map&lt;std::string, etfnode&gt;(), ascii::space_type&gt; { etf_parser() : etf_parser::base_type(start) { using qi::int_; using qi::lit; using qi::double_; using qi::bool_; using qi::lexeme; using ascii::char_; quoted_string %= lexeme['"' &gt;&gt; +(char_ - '"') &gt;&gt; '"']; dataVal %= (quoted_string | double_ | int_ | bool_ | listObj | pairObj | mapObj); pairObj %= ('&lt;' &gt;&gt; dataVal &gt;&gt; ',' &gt;&gt; dataVal &gt;&gt; '&gt;'); listObj %= '{' &gt;&gt; dataVal % ',' &gt;&gt; '}'; mapKey %= +qi::char_("a-zA-Z_-0-9."); mapPair %= mapKey &gt;&gt; lit('=') &gt;&gt; dataVal; mapObj %= '(' &gt;&gt; mapPair % ',' &gt;&gt; ')'; start %= mapPair &gt;&gt; ';'; } qi::rule&lt;Iterator, std::string(), ascii::space_type&gt; quoted_string; // Data value parsers qi::rule&lt;Iterator, etfnode(), ascii::space_type&gt; dataVal; qi::rule&lt;Iterator, std::vector&lt;etfnode&gt;(), ascii::space_type&gt; listObj; qi::rule&lt;Iterator, std::pair&lt;etfnode, etfnode&gt;(), ascii::space_type&gt; pairObj; qi::rule&lt;Iterator, std::map&lt;std::string, etfnode&gt;(), ascii::space_type&gt; mapObj; qi::rule&lt;Iterator, std::pair&lt;std::string, etfnode&gt;(), ascii::space_type&gt; mapPair; qi::rule&lt;Iterator, std::string(), ascii::space_type&gt; mapKey; qi::rule&lt;Iterator, std::map&lt;std::string, etfnode&gt;(), ascii::space_type&gt; start; }; </code></pre> <p>And here's the parsing function. When I comment out the qi::parse call, the code compiles fine:</p> <pre><code>ETFDocument::ETFDocument(std::string content) { etf_parser&lt;std::string::const_iterator&gt; parser; std::map&lt;std::string, rwnode&gt; results; std::string::const_iterator begin = content.begin(); std::string::const_iterator end = content.end(); bool result = qi::parse(begin, end, parser, results); if(result) printf("Parsing succeeded\n"); else printf("Parsing failed\n"); m_root = etfnode(results); } </code></pre> <p>The compiler spits out the following error when I try to compile:</p> <pre><code>In file included from /usr/include/boost/spirit/home/qi/nonterminal.hpp:14:0, from /usr/include/boost/spirit/home/qi.hpp:20, from /usr/include/boost/spirit/include/qi.hpp:16, from libmcg/etf.cpp:8: /usr/include/boost/spirit/home/qi/nonterminal/rule.hpp: In instantiation of ‘bool boost::spirit::qi::rule&lt;Iterator, T1, T2, T3, T4&gt;::parse(Iterator&amp;, const Iterator&amp;, Context&amp;, const Skipper&amp;, Attribute&amp;) const [with Context = boost::spirit::context&lt;boost::fusion::cons&lt;std::map&lt;std::basic_string&lt;char&gt;, boost::recursive_wrapper&lt;ETFDocument::etfnode&gt; &gt;&amp;, boost::fusion::nil&gt;, boost::spirit::locals&lt;&gt; &gt;; Skipper = boost::spirit::unused_type; Attribute = std::map&lt;std::basic_string&lt;char&gt;, boost::recursive_wrapper&lt;ETFDocument::etfnode&gt; &gt;; Iterator = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char&gt; &gt;; T1 = std::map&lt;std::basic_string&lt;char&gt;, boost::recursive_wrapper&lt;ETFDocument::etfnode&gt; &gt;(); T2 = boost::proto::exprns_::expr&lt;boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term&lt;boost::spirit::tag::char_code&lt;boost::spirit::tag::space, boost::spirit::char_encoding::ascii&gt; &gt;, 0l&gt;; T3 = boost::spirit::unused_type; T4 = boost::spirit::unused_type]’: /usr/include/boost/spirit/home/qi/reference.hpp:43:71: required from ‘bool boost::spirit::qi::reference&lt;Subject&gt;::parse(Iterator&amp;, const Iterator&amp;, Context&amp;, const Skipper&amp;, Attribute&amp;) const [with Iterator = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char&gt; &gt;; Context = boost::spirit::context&lt;boost::fusion::cons&lt;std::map&lt;std::basic_string&lt;char&gt;, boost::recursive_wrapper&lt;ETFDocument::etfnode&gt; &gt;&amp;, boost::fusion::nil&gt;, boost::spirit::locals&lt;&gt; &gt;; Skipper = boost::spirit::unused_type; Attribute = std::map&lt;std::basic_string&lt;char&gt;, boost::recursive_wrapper&lt;ETFDocument::etfnode&gt; &gt;; Subject = const boost::spirit::qi::rule&lt;__gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char&gt; &gt;, std::map&lt;std::basic_string&lt;char&gt;, boost::recursive_wrapper&lt;ETFDocument::etfnode&gt; &gt;(), boost::proto::exprns_::expr&lt;boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term&lt;boost::spirit::tag::char_code&lt;boost::spirit::tag::space, boost::spirit::char_encoding::ascii&gt; &gt;, 0l&gt;, boost::spirit::unused_type, boost::spirit::unused_type&gt;]’ /usr/include/boost/spirit/home/qi/parse.hpp:86:82: required from ‘bool boost::spirit::qi::parse(Iterator&amp;, Iterator, const Expr&amp;, Attr&amp;) [with Iterator = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char&gt; &gt;; Expr = etf_parser&lt;__gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char&gt; &gt; &gt;; Attr = std::map&lt;std::basic_string&lt;char&gt;, boost::recursive_wrapper&lt;ETFDocument::etfnode&gt; &gt;]’ libmcg/etf.cpp:113:53: required from here /usr/include/boost/spirit/home/qi/nonterminal/rule.hpp:303:17: error: no match for call to ‘(const function_type {aka const boost::function&lt;bool(__gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char&gt; &gt;&amp;, const __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char&gt; &gt;&amp;, boost::spirit::context&lt;boost::fusion::cons&lt;std::map&lt;std::basic_string&lt;char&gt;, boost::recursive_wrapper&lt;ETFDocument::etfnode&gt; &gt;&amp;, boost::fusion::nil&gt;, boost::fusion::vector0&lt;&gt; &gt;&amp;, const boost::spirit::qi::char_class&lt;boost::spirit::tag::char_code&lt;boost::spirit::tag::space, boost::spirit::char_encoding::ascii&gt; &gt;&amp;)&gt;}) (__gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char&gt; &gt;&amp;, const __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char&gt; &gt;&amp;, boost::spirit::qi::rule&lt;__gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char&gt; &gt;, std::map&lt;std::basic_string&lt;char&gt;, boost::recursive_wrapper&lt;ETFDocument::etfnode&gt; &gt;(), boost::proto::exprns_::expr&lt;boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term&lt;boost::spirit::tag::char_code&lt;boost::spirit::tag::space, boost::spirit::char_encoding::ascii&gt; &gt;, 0l&gt;, boost::spirit::unused_type, boost::spirit::unused_type&gt;::context_type&amp;, const boost::spirit::unused_type&amp;)’ In file included from /usr/include/boost/function/detail/maybe_include.hpp:33:0, from /usr/include/boost/function/detail/function_iterate.hpp:14, from /usr/include/boost/preprocessor/iteration/detail/iter/forward1.hpp:67, from /usr/include/boost/function.hpp:64, from /usr/include/boost/spirit/home/qi/nonterminal/rule.hpp:16, from /usr/include/boost/spirit/home/qi/nonterminal.hpp:14, from /usr/include/boost/spirit/home/qi.hpp:20, from /usr/include/boost/spirit/include/qi.hpp:16, from libmcg/etf.cpp:8: /usr/include/boost/function/function_template.hpp:1021:7: note: candidate is: /usr/include/boost/function/function_template.hpp:754:17: note: boost::function4&lt;R, T1, T2, T3, T4&gt;::result_type boost::function4&lt;R, T1, T2, T3, T4&gt;::operator()(T0, T1, T2, T3) const [with R = bool; T0 = __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char&gt; &gt;&amp;; T1 = const __gnu_cxx::__normal_iterator&lt;const char*, std::basic_string&lt;char&gt; &gt;&amp;; T2 = boost::spirit::context&lt;boost::fusion::cons&lt;std::map&lt;std::basic_string&lt;char&gt;, boost::recursive_wrapper&lt;ETFDocument::etfnode&gt; &gt;&amp;, boost::fusion::nil&gt;, boost::fusion::vector0&lt;&gt; &gt;&amp;; T3 = const boost::spirit::qi::char_class&lt;boost::spirit::tag::char_code&lt;boost::spirit::tag::space, boost::spirit::char_encoding::ascii&gt; &gt;&amp;; boost::function4&lt;R, T1, T2, T3, T4&gt;::result_type = bool] /usr/include/boost/function/function_template.hpp:754:17: note: no known conversion for argument 4 from ‘const boost::spirit::unused_type’ to ‘const boost::spirit::qi::char_class&lt;boost::spirit::tag::char_code&lt;boost::spirit::tag::space, boost::spirit::char_encoding::ascii&gt; &gt;&amp;’ </code></pre> <p>As far as I can tell, it's looking for a Skipper, but getting boost::spirit::unused_type instead. I'm not sure why this would happen, since I specified a Skipper in my parser definition. I'm using boost v1.49.0 on gcc 4.7.1.</p> <p><strong>EDIT</strong>: Here's the definition for etfnode. There's a typedef at the beginning of the cpp file (containing the other code fragments) that aliases "etfnode" to "rwnode".</p> <pre><code>enum DataType { DT_INT, DT_STRING, DT_FLOAT, DT_BOOL, DT_LIST, DT_PAIR, DT_MAP }; struct etfnode; typedef boost::recursive_wrapper&lt;etfnode&gt; rwnode; typedef boost::variant&lt; int, std::string, double, bool, std::vector&lt;rwnode&gt;, std::pair&lt;rwnode, rwnode&gt;, std::map&lt;std::string, rwnode&gt; &gt; etfvalue; struct etfnode { DataType type; etfvalue value; etfnode(const std::string&amp; s); etfnode(const int i); etfnode(const double d); etfnode(const bool b); etfnode(const std::vector&lt;rwnode&gt;&amp; n); etfnode(const std::pair&lt;rwnode, rwnode&gt;&amp; p); etfnode(const std::map&lt;std::string, rwnode&gt;&amp; p); etfnode(); }; </code></pre> <p>And a test string:</p> <pre><code>foo = 6; bar = &lt;"bar", 16.5&gt;; baz = { ( foobar = "foo", bar = 12 ), "foobar" }; </code></pre>
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    1. COYour error seems to be located in one of the rules that have an attribute of `std::map<std::string,etfnode>()`. Shouldn't your `start` rule be `start %= mapObj >> ';';`?
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    2. COThanks for pointing that out, although it actually should be `start %= mapPair % ';';`. I changed it and the problem still occurs though.
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    3. COcould you add the definition of etfnode and a test string to be parsed?
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