如何使用boost spirit x3实现自定义解析器对象，使其与skipper配合得很好？

#include <boost/spirit/home/x3.hpp>
namespace x3 = boost::spirit::x3;

struct custom_parser : x3::parser<custom_parser> {
    typedef boost::spirit::unused_type attribute_type;
    static bool const has_attribute = false;
    
    template <typename Iterator, typename Context, typename RContext, typename Attribute>
    bool parse(Iterator& first, Iterator const& last, Context const& context, RContext& rcontext, Attribute& attr) const {
        // 解析逻辑
        // 使用context和rcontext访问上下文信息
        // 更新attr传递解析结果
        return true; // 解析成功返回true，否则返回false
    }
};

auto const custom = x3::rule<class custom_rule, custom_parser>{"custom"};
auto const custom_def = custom_parser{}; // 或者自定义解析器对象的初始化
BOOST_SPIRIT_DEFINE(custom)

auto const skipper = x3::space;

auto const parser = x3::skip(skipper)[custom];

std::string input = "Your Input String";
auto iter = input.begin();
auto end = input.end();
auto result = x3::parse(iter, end, parser);