I'm new to spirit x3 and was wondering what x3::raw is good for. I experimented with a simple parser following an example from qi:
const auto rule= (x3::alpha | '_') >> *(x3::alnum | '_');
const auto rule_raw= x3::raw[ rule ];
string in = "Jame007 "; // trailing spaces
string result;
auto r= x3::phrase_parse( in.begin(), in.end(), rule, x3::ascii::space, result );
cerr << "rule: " << r << " result:'" << result << "'\n";
result= "";
r= x3::phrase_parse( in.begin(), in.end(), rule_raw, x3::ascii::space, result );
cerr << "rule_raw: " << r << " result:'" << result << "'\n";
The output is
rule: 1 result:'Jame007'
rule_raw: 1 result:'Jame007 ' <--- includes spaces
The outcome of parsing with rule is as expected, but why does the result of rule_raw contain the trailing spaces?
