i'm trying compile simple grammar using boost spirit, compilation error , after spending hour trying figure out reason hope community sees problem or be. source code viper.h:
#pragma once #include <string> #include <vector> #define boost_spirit_unicode #include <boost/spirit/include/qi.hpp> #include <boost/spirit/include/phoenix_core.hpp> #include <boost/fusion/adapted/boost_tuple.hpp> namespace nsunic = boost::spirit::unicode; namespace nsqi = boost::spirit::qi; namespace viper { struct identifier { std::wstring name; }; struct identifier2 { std::wstring name; }; struct function { boost::variant<identifier, identifier2> func; }; struct program { std::vector<function> functions; }; } boost_fusion_adapt_struct( viper::identifier, (std::wstring, name) ) boost_fusion_adapt_struct( viper::identifier2, (std::wstring, name) ) boost_fusion_adapt_struct( viper::function, (boost::variant<viper::identifier,viper::identifier2>, func) ) boost_fusion_adapt_struct( viper::program, (std::vector<viper::function>, functions) ) namespace viper { template<typename iterator> struct function_parser : nsqi::grammar<iterator, program(), nsqi::space_type> { function_parser() : function_parser::base_type(program) { identifier %= nsqi::eps >> (char_('a') > *(nsqi::alnum | nsqi::char_('_'))); identifier2 %= nsqi::eps >> (char_('b') > *(nsqi::alnum | nsqi::char_('_'))); function %= identifier | identifier2; program %= nsqi::eps >> +function; } nsqi::rule<iterator, identifier()> identifier; nsqi::rule<iterator, identifier2()> identifier2; nsqi::rule<iterator, function(), nsqi::space_type> function; nsqi::rule<iterator, program(), nsqi::space_type> program; }; std::wstring render(const program& f) { std::wostringstream s; const auto functions_count = f.functions.size(); for(auto j=0; j<functions_count; ++j) { if(j>0) { s << l","; } s << f.functions[j].name; } return s.str(); } template<typename iterator> std::wstring parse(iterator first, iterator last) { using nsqi::phrase_parse; program f; function_parser<iterator> fp; auto b = phrase_parse(first, last, fp, nsqi::space, f); if(b) { return render(f); } return std::wstring(l"fail"); } } the output of compiler this:
1>------ build started: project: viper.notepad, configuration: debug win32 ------ 1>build started 24-jan-16 17:40:29. 1>initializebuildstatus: 1> touching "debug\viper.notepad.unsuccessfulbuild". 1>clcompile: 1> outputs up-to-date. 1> viper.notepad.cpp 1>c:\users\srzmtl\local_copies\visual studio\visual studio 2010\viper\viper\viper.h(51): warning c4002: many actual parameters macro 'boost_fusion_adapt_struct_filler_0' 1>c:\users\srzmtl\local_copies\visual studio\visual studio 2010\viper\viper\viper.h(51): error c2146: syntax error : missing ',' before identifier 'attribute_type' 1>c:\users\srzmtl\local_copies\visual studio\visual studio 2010\viper\viper\viper.h(51): error c2065: 'attribute_type' : undeclared identifier 1>c:\users\srzmtl\local_copies\visual studio\visual studio 2010\viper\viper\viper.h(51): error c2143: syntax error : missing '>' before ';' 1>c:\users\srzmtl\local_copies\visual studio\visual studio 2010\viper\viper\viper.h(51): error c2208: 'boost::variant' : no members defined using type 1>c:\users\srzmtl\local_copies\visual studio\visual studio 2010\viper\viper\viper.h(51): fatal error c1903: unable recover previous error(s); stopping compilation 1> 1>build failed. 1> 1>time elapsed 00:00:23.25 ========== build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ========== line 51 closing ')' of 3rd boost_fusion_adapt_struct() macro.
the problem boost::variant<viper::identifier,viper::identifier2> contains comma (,) , such interpreted 2 arguments preprocessor.
a workaround:
typedef boost::variant<viper::identifier,viper::identifier2> variant; boost_fusion_adapt_struct( viper::function, (variant, func) ) some other workarounds listed here.
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