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const auto grammar = (-terminalSet('+', '-') >> terminalRange('0', '9')) == std::string("int");
std::string input = "123";
ParseContext<> pc(input);
const bool ok = grammar(pc);
for(const auto& match : pc.matches()) {
    if (match.id() == "int") {
	    const auto parsedString = match.content();
    	//process int
    }
}

match.id() == "int"

enum class token { aa, bb, cc};    
auto rule = token::aa >> token::bb >> -token::cc;
std::vector<token> tokens{token::aa, token:bb, token:cc};
auto ok = parse(tokens.cbegin(), tokens.cend(), rule);

extern Rule<> add;

const auto val = +terminalRange('0', '9');

const auto num = val
               | '(' >> add >> ')';

Rule<> mul = mul >> '*' >> num
           | mul >> '/' >> num
           | num;

Rule<> add = add >> '+' >> mul
           | add >> '-' >> mul
           | mul;

#define JAVA_LETTER (range('a', 'z') | range('A', 'Z') | set("$_"))
#define JAVA_DIGIT range('0', '9')
#define JAVA_LETTER_OR_DIGIT (JAVA_LETTER | JAVA_DIGIT)
#define NEWLINE nl(expr("\r\n") | "\n\r" | '\n' | '\r')
#define EVERYTHING_TO(endChar) *(!expr(endChar) >> range(0, 255))

rule whitespace = *(NEWLINE | range(0, 32));
rule identifier = (JAVA_LETTER >> *JAVA_LETTER_OR_DIGIT);
//rule identifier = *JAVA_LETTER;
rule qualifiedName = identifier >> *('.' >> identifier);
rule annotationText = expr('(') >> EVERYTHING_TO(')') >> ')';
rule annotation = expr('@') >> qualifiedName >> annotationText;
rule packageDeclaration = *annotation >> "package" >> qualifiedName >> ';';
rule importDeclaration = expr("import") >> -expr("static") >> qualifiedName >> -expr(".*") >> ';';
rule classOrInterfaceModifier = expr("public") | "protected" | "private" | "static" | "abstract" | "final" | "strictfp";
rule templateBlockText = EVERYTHING_TO(set("<>"));
rule templateBlock = expr('<') >> templateBlockText >> -templateBlock >> '>';
rule classDeclaration = term("class") >> identifier /* -templateBlock >>*/ >> "extends" /* >> identifier >> "implements" >> identifier >> '{' >> '}'*/;
rule typeDeclaration = *classOrInterfaceModifier >> classDeclaration;
rule compilationUnit = /*packageDeclaration >> *importDeclaration >>*/ typeDeclaration;

found 1 error:
    line 1, col 51:

error_list errors;
RootCompilationUnit *root;
string str = "protected abstract static class ClassName extends \n";
input input(str.begin(), str.end());
parse(input, compilationUnit, whitespace, errors, root);