我想更改语义操作中的局部变量值,如下所示:
#define BOOST_SPIRIT_USE_PHOENIX_V3
#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/phoenix.hpp>
#include <string>
namespace qi = boost::spirit::qi;
namespace spirit = boost::spirit;
namespace ascii = boost::spirit::ascii;
using boost::phoenix::ref;
using boost::phoenix::bind;
void dummy(const std::vector<char>& v, int& var)
{
var = 7;
}
template <typename Iterator>
struct x_grammar : public qi::grammar<Iterator, std::string(), ascii::space_type>
{
public:
x_grammar() : x_grammar::base_type(start_rule, "x_grammar")
{
using namespace qi;
int local_var = 0;
start_rule = (+(char_ - ";"))[bind(dummy, _1, ref(local_var))];
//repeat(ref(local_var))[some_rule];
}
private:
qi::rule<Iterator, std::string(), ascii::space_type> start_rule;
};
int main()
{
typedef std::string::const_iterator iter;
std::string storage("string;aaa");
iter it_begin(storage.begin());
iter it_end(storage.end());
std::string read_data;
using boost::spirit::ascii::space;
x_grammar<iter> g;
try {
bool r = qi::phrase_parse(it_begin, it_end, g, space, read_data);
std::cout << "Pass!\n";
} catch (const qi::expectation_failure<iter>& x) {
std::cout << "Error!\n";
}
}
我在使用 GCC 4.6.1 和 boost 1.55 时遇到了一些烦人的编译错误。