如何使用qi创建一个泛型解析器？

#include <boost/spirit/include/qi.hpp>
#include <iostream>
#include <string>

namespace qi = boost::spirit::qi;

int main()
{
    std::string input = "42 3.14";
    int intValue;
    double floatValue;

    // 定义解析规则
    qi::rule<std::string::iterator, int()> intRule = qi::int_;
    qi::rule<std::string::iterator, double()> floatRule = qi::double_;

    // 创建解析器对象
    qi::rule<std::string::iterator> parser = intRule | floatRule;

    // 解析数据
    std::string::iterator iter = input.begin();
    std::string::iterator end = input.end();
    bool success = qi::parse(iter, end, parser, intValue, floatValue);

    // 处理解析结果
    if (success && iter == end)
    {
        std::cout << "解析成功：" << intValue << ", " << floatValue << std::endl;
    }
    else
    {
        std::cout << "解析失败" << std::endl;
    }

    return 0;
}