c++ - 使用 Boost Spirit 解析带有数组的结构

Question

在我开始之前，是的，我知道有很多与这个主题相关的帖子，我花了一天多的时间阅读但我对 Boost::spirit 的了解是有限的，所以我可以弄清楚如何解决我的问题。

我拿Boost Employee这个例子修改一下，给大家看

#include <boost/config/warning_disable.hpp>
#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/phoenix_core.hpp>
#include <boost/spirit/include/phoenix_operator.hpp>
#include <boost/spirit/include/phoenix_object.hpp>
#include <boost/fusion/include/adapt_struct.hpp>
#include <boost/fusion/include/io.hpp>

#include <iostream>
#include <string>
#include <complex>

namespace client
{
    namespace qi = boost::spirit::qi;
    namespace ascii = boost::spirit::ascii;

    ///////////////////////////////////////////////////////////////////////////
    //  Our employee struct
    ///////////////////////////////////////////////////////////////////////////
    //[tutorial_employee_struct
struct employee
{
    char user[31];
    char pass[34];
    uint16_t page;        // Pagina de usuarios
    uint16_t port;        // Puerto por donde es realiza la comunicación
    uint8_t  ip[4];       // Direccion del socket de juego
    uint16_t amount;
    uint16_t cents;
    char nick[9];
    uint8_t already_logged;
    uint8_t version;
    uint8_t extension;
};
}

// We need to tell fusion about our employee struct
// to make it a first-class fusion citizen. This has to
// be in global scope.

//[tutorial_employee_adapt_struct
BOOST_FUSION_ADAPT_STRUCT(
    client::employee,
    (char, user[31])
    (char, pass[34])
    (uint16_t, page)
    (uint16_t, port)
    (uint8_t, ip[4])
    (uint16_t, amount)
    (uint16_t, cents)
    (char, nick[9])
    (uint8_t, already_logged)
    (uint8_t, version)
    (uint8_t, extension)
)
//]

namespace client
{
    ///////////////////////////////////////////////////////////////////////////////
    //  Our employee parser
    ///////////////////////////////////////////////////////////////////////////////
    //[tutorial_employee_parser
    template <typename Iterator>
    struct employee_parser : qi::grammar<Iterator, employee(), ascii::space_type>
    {
        employee_parser() : employee_parser::base_type(start)
        {
            using boost::spirit::qi::ushort_;
            using ascii::char_;

            start %=
                char_ >> ','
                >> char_ >> ','
                >> ushort_ >> ','

                ;
        }

        qi::rule<Iterator, employee(), ascii::space_type> start;
    };
    //]
}

////////////////////////////////////////////////////////////////////////////
//  Main program
////////////////////////////////////////////////////////////////////////////
int
main()
{
    std::cout << "/////////////////////////////////////////////////////////\n\n";
    std::cout << "\t\tAn employee parser for Spirit...\n\n";
    std::cout << "/////////////////////////////////////////////////////////\n\n";

    std::cout
        << "Give me an employee of the form :"
        << "employee{age, \"surname\", \"forename\", salary } \n";
    std::cout << "Type [q or Q] to quit\n\n";

    using boost::spirit::ascii::space;
    typedef std::string::const_iterator iterator_type;
    typedef client::employee_parser<iterator_type> employee_parser;

    employee_parser g; // Our grammar
    std::string str;
    while (getline(std::cin, str))
    {
        if (str.empty() || str[0] == 'q' || str[0] == 'Q')
            break;

        client::employee emp;
        std::string::const_iterator iter = str.begin();
        std::string::const_iterator end = str.end();
        bool r = phrase_parse(iter, end, g, space, emp);

        if (r && iter == end)
        {
            std::cout << boost::fusion::tuple_open('[');
            std::cout << boost::fusion::tuple_close(']');
            std::cout << boost::fusion::tuple_delimiter(", ");

            std::cout << "-------------------------\n";
            std::cout << "Parsing succeeded\n";
            std::cout << "got: " << boost::fusion::as_vector(emp) << std::endl;
            std::cout << "\n-------------------------\n";
        }
        else
        {
            std::cout << "-------------------------\n";
            std::cout << "Parsing failed\n";
            std::cout << "-------------------------\n";
        }
    }

    std::cout << "Bye... :-) \n\n";
    return 0;
}

但是我得到了这个编译错误，我不知道如何解决它或如何编写解析器

In file included from /usr/include/boost/fusion/include/as_vector.hpp:11:0,
                 from /usr/include/boost/spirit/home/support/attributes.hpp:24,
                 from /usr/include/boost/spirit/home/qi/detail/attributes.hpp:12,
                 from /usr/include/boost/spirit/home/qi/action/action.hpp:16,
                 from /usr/include/boost/spirit/home/qi/action.hpp:14,
                 from /usr/include/boost/spirit/home/qi.hpp:14,
                 from /usr/include/boost/spirit/include/qi.hpp:16,
                 from user.cpp:17:
/usr/include/boost/fusion/container/vector/convert.hpp: In instantiation of ‘struct boost::fusion::result_of::as_vector<const client::employee>’:
/usr/include/boost/fusion/container/vector/convert.hpp:43:5:   required by substitution of ‘template<class Sequence> typename boost::fusion::result_of::as_vector<const Sequence>::type boost::fusion::as_vector(const Sequence&) [with Sequence = client::employee]’
user.cpp:140:65:   required from here
/usr/include/boost/fusion/container/vector/convert.hpp:27:13: error: invalid use of incomplete type ‘struct boost::fusion::detail::as_vector<11>’
             type;
             ^
In file included from /usr/include/boost/fusion/container/vector/convert.hpp:11:0,
                 from /usr/include/boost/fusion/include/as_vector.hpp:11,
                 from /usr/include/boost/spirit/home/support/attributes.hpp:24,
                 from /usr/include/boost/spirit/home/qi/detail/attributes.hpp:12,
                 from /usr/include/boost/spirit/home/qi/action/action.hpp:16,
                 from /usr/include/boost/spirit/home/qi/action.hpp:14,
                 from /usr/include/boost/spirit/home/qi.hpp:14,
                 from /usr/include/boost/spirit/include/qi.hpp:16,
                 from user.cpp:17:
/usr/include/boost/fusion/container/vector/detail/as_vector.hpp:26:12: error: declaration of ‘struct boost::fusion::detail::as_vector<11>’
     struct as_vector;
            ^
In file included from /usr/include/boost/fusion/include/as_vector.hpp:11:0,
                 from /usr/include/boost/spirit/home/support/attributes.hpp:24,
                 from /usr/include/boost/spirit/home/qi/detail/attributes.hpp:12,
                 from /usr/include/boost/spirit/home/qi/action/action.hpp:16,
                 from /usr/include/boost/spirit/home/qi/action.hpp:14,
                 from /usr/include/boost/spirit/home/qi.hpp:14,
                 from /usr/include/boost/spirit/include/qi.hpp:16,
                 from user.cpp:17:
/usr/include/boost/fusion/container/vector/convert.hpp: In instantiation of ‘struct boost::fusion::result_of::as_vector<client::employee>’:
/usr/include/boost/fusion/container/vector/convert.hpp:34:5:   required by substitution of ‘template<class Sequence> typename boost::fusion::result_of::as_vector<Sequence>::type boost::fusion::as_vector(Sequence&) [with Sequence = client::employee]’
user.cpp:140:65:   required from here
/usr/include/boost/fusion/container/vector/convert.hpp:27:13: error: invalid use of incomplete type ‘struct boost::fusion::detail::as_vector<11>’
             type;
             ^
In file included from /usr/include/boost/fusion/container/vector/convert.hpp:11:0,
                 from /usr/include/boost/fusion/include/as_vector.hpp:11,
                 from /usr/include/boost/spirit/home/support/attributes.hpp:24,
                 from /usr/include/boost/spirit/home/qi/detail/attributes.hpp:12,
                 from /usr/include/boost/spirit/home/qi/action/action.hpp:16,
                 from /usr/include/boost/spirit/home/qi/action.hpp:14,
                 from /usr/include/boost/spirit/home/qi.hpp:14,
                 from /usr/include/boost/spirit/include/qi.hpp:16,
                 from user.cpp:17:
/usr/include/boost/fusion/container/vector/detail/as_vector.hpp:26:12: error: declaration of ‘struct boost::fusion::detail::as_vector<11>’
     struct as_vector;
            ^
user.cpp: In function ‘int main()’:
user.cpp:140:65: error: no matching function for call to ‘as_vector(client::employee&)’
             std::cout << "got: " << boost::fusion::as_vector(emp) << std::endl;
                                                                 ^
user.cpp:140:65: note: candidates are:
In file included from /usr/include/boost/fusion/include/as_vector.hpp:11:0,
                 from /usr/include/boost/spirit/home/support/attributes.hpp:24,
                 from /usr/include/boost/spirit/home/qi/detail/attributes.hpp:12,
                 from /usr/include/boost/spirit/home/qi/action/action.hpp:16,
                 from /usr/include/boost/spirit/home/qi/action.hpp:14,
                 from /usr/include/boost/spirit/home/qi.hpp:14,
                 from /usr/include/boost/spirit/include/qi.hpp:16,
                 from user.cpp:17:
/usr/include/boost/fusion/container/vector/convert.hpp:34:5: note: template<class Sequence> typename boost::fusion::result_of::as_vector<Sequence>::type boost::fusion::as_vector(Sequence&)
     as_vector(Sequence& seq)
     ^
/usr/include/boost/fusion/container/vector/convert.hpp:34:5: note:   substitution of deduced template arguments resulted in errors seen above
/usr/include/boost/fusion/container/vector/convert.hpp:43:5: note: template<class Sequence> typename boost::fusion::result_of::as_vector<const Sequence>::type boost::fusion::as_vector(const Sequence&)
     as_vector(Sequence const& seq)
     ^
/usr/include/boost/fusion/container/vector/convert.hpp:43:5: note:   substitution of deduced template arguments resulted in errors seen above

我只需要有一个固定大小的结构，这就是使用 char XXX[31] 的原因，但我可以为任何具有固定大小的声明更改它。

提前致谢

Answer 1

您有超过 10 个字段。您需要提高 fusion/container/vector/limits.hpp 中的默认序列大小限制。

在包含任何 boost 融合 header (或任何 boost header ，因为许多库可能隐式包含它)之前包含它:

#define FUSION_MAX_VECTOR_SIZE 15