Filter the synthesized attribute through a std::map in a boost spirit semantic action

Question

I have a case where I\'d like to filter the value that comes up as a synthesized attribute inside of a rule through a std::map.

• The map is pre-generated and wi

Answer 1

_{Reposting from comment}

Try qi::_val = phx::ref(myMap)[qi::_1] rather than qi::_val = phx::at(myMap, qi::_1).