What version are you using? Boost 1.42? 1.43? Trunk? This looks like it should work in 1.43, or at least the trunk, but there was a known bug with single element structs before that.
I am using Boost 1.42 and hence Spirit 2.2. single-elem struct is just a coincidence my problem still appears if I use a two-elem struct (again, the code enclosed and relevant extracts follow): struct Data { char val1; char val2; }; BOOST_FUSION_ADAPT_STRUCT(Data,(char, val1)(char, val2)); struct TestGrammar : qi::grammar<Iter, std::map<int,Data>(), ascii::space_type> { qi::rule<Iter, std::map<int,Data>(), ascii::space_type> list; qi::rule<Iter, Data(), ascii::space_type> value; TestGrammar() : TestGrammar::base_type(list) { value = qi::char_[ at_c<0>(_val) = _1 ] >> qi::char_[ at_c<1>(_val) = _1 ]; list = (qi::int_ >> value)[ _val[_1] = _2 ]; } }; int main( ) { std::string input = "2 c d"; Iter iter = input.begin(), end = input.end(); TestGrammar grammar; std::map<int,Data> map; bool ans = phrase_parse( iter, end, grammar, space, map ); assert( ans ); assert( iter == end ); BOOST_AUTO( it, map.find(2) ); assert( it != map.end() ); assert( it->second.val1 == 'c' ); // FAILS! assert( it->second.val2 == 'd' ); // FAILS! }
This is usually better to ask on the Spirit mailing list. :) Thanks for the advice, I will try that.
Regards, &rzej