我正在使用Boost.Spirit进行IRC消息解析器，但是当我尝试解析输入时，我收到了（非常长的）错误。我遵循了“Roman Numerals”的例子。另外，我正在g++4.7使用-std=c++11。仅当我在phrase_parse()上调用test.cpp时才会出现此错误，而不是在我创建message_grammar的实例时。
语法课是：
class message_grammar : qi::grammar<std::string::const_iterator, std::string()>
{
public:
message_grammar() : base_type(m_message)
{
using qi::_val;
using qi::_1;
using boost::spirit::ascii::char_;
using qi::lit;
qi::rule<std::string::const_iterator, std::string()> alpha, graph, number, special, user,
nick, chn, channel;
alpha = qi::as_string[qi::alpha];
graph = qi::as_string[qi::graph];
number = qi::as_string[char_('0', '9')];
chn = qi::as_string[(char_('#') | char_('$'))];
special = qi::as_string[
char_('-') | char_('[') | char_(']') | char_('\\')
| char_('`') | char_('^') | char_('{') | char_('}')
];
user = (
graph [_val = std::string("USER%% ") + _1]
>> *graph[_val += _1]
);
nick = (
alpha[_val = std::string("NICK%% ") + _1]
>>
*(
alpha
| number
| special
)[_val += _1]
);
channel = (
chn [_val = std::string("CHAN%% ") + _1]
>> +(alpha | number | special) [_val += _1]
);
m_message = (
nick [_val = _1]
>> alpha [_val += std::string(" ") + _1]
>> channel [_val += std::string(" ") + _1]
>> user [_val += std::string(" ") + _1]
);
}
qi::rule<std::string::const_iterator, std::string()> m_message;
};
，测试功能是：
int main()
{
string str, parsed_str;
getline(cin, str);
irc::message_grammar grammar;
auto it = str.begin();
auto end = str.end();
bool ok = qi::phrase_parse(it, end,
grammar
, qi::space, parsed_str);
if (ok && it == end) {
cout << "OK" << endl;
cout << parsed_str << endl;
}
else {
cout << "NO " << ok << endl;
}
}
错误信息：
murilo@mac:cleverbot$ g++-mp-4.7 -std=c++11 test.cpp -Wall
In file included from /opt/local/include/boost/proto/core.hpp:23:0,
from /opt/local/include/boost/proto/proto.hpp:12,
from /opt/local/include/boost/spirit/home/support/meta_compiler.hpp:19,
from /opt/local/include/boost/spirit/home/qi/meta_compiler.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi.hpp:14,
from /opt/local/include/boost/spirit/include/qi.hpp:16,
from ircparser.h:6,
from test.cpp:1:
/opt/local/include/boost/proto/domain.hpp: In instantiation of 'struct boost::proto::domainns_::domain<>::as_expr<irc::message_grammar>':
/opt/local/include/boost/proto/traits.hpp:266:71: required from 'struct boost::proto::result_of::as_expr<irc::message_grammar, boost::proto::domainns_::default_domain>'
/opt/local/include/boost/spirit/home/support/meta_compiler.hpp:221:16: required from 'struct boost::spirit::traits::matches<boost::spirit::qi::domain, irc::message_grammar>'
/opt/local/include/boost/spirit/home/qi/parse.hpp:155:9: required from 'bool boost::spirit::qi::phrase_parse(Iterator&, Iterator, const Expr&, const Skipper&, boost::spirit::qi::skip_flag, Attr&) [with Iterator = __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >; Expr = irc::message_grammar; Skipper = boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::tag::char_code<boost::spirit::tag::space, boost::spirit::char_encoding::standard> >, 0l>; Attr = std::basic_string<char>]'
/opt/local/include/boost/spirit/home/qi/parse.hpp:197:86: required from 'bool boost::spirit::qi::phrase_parse(Iterator&, Iterator, const Expr&, const Skipper&, Attr&) [with Iterator = __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >; Expr = irc::message_grammar; Skipper = boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::tag::char_code<boost::spirit::tag::space, boost::spirit::char_encoding::standard> >, 0l>; Attr = std::basic_string<char>]'
test.cpp:20:25: required from here
/opt/local/include/boost/proto/extends.hpp:551:13: error: 'typedef void boost::proto::exprns_::extends<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::qi::reference<const boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>(), boost::spirit::unused_type, boost::spirit::unused_type, boost::spirit::unused_type> > >, 0l>, boost::spirit::qi::grammar<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>()>, boost::proto::domainns_::default_domain, 0l>::proto_is_expr_' is inaccessible
In file included from /opt/local/include/boost/proto/traits.hpp:32:0,
from /opt/local/include/boost/proto/expr.hpp:27,
from /opt/local/include/boost/proto/core.hpp:17,
from /opt/local/include/boost/proto/proto.hpp:12,
from /opt/local/include/boost/spirit/home/support/meta_compiler.hpp:19,
from /opt/local/include/boost/spirit/home/qi/meta_compiler.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi.hpp:14,
from /opt/local/include/boost/spirit/include/qi.hpp:16,
from ircparser.h:6,
from test.cpp:1:
/opt/local/include/boost/proto/domain.hpp:141:13: error: within this context
In file included from /opt/local/include/boost/proto/core.hpp:23:0,
from /opt/local/include/boost/proto/proto.hpp:12,
from /opt/local/include/boost/spirit/home/support/meta_compiler.hpp:19,
from /opt/local/include/boost/spirit/home/qi/meta_compiler.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi.hpp:14,
from /opt/local/include/boost/spirit/include/qi.hpp:16,
from ircparser.h:6,
from test.cpp:1:
/opt/local/include/boost/proto/extends.hpp:551:13: error: 'typedef void boost::proto::exprns_::extends<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::qi::reference<const boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>(), boost::spirit::unused_type, boost::spirit::unused_type, boost::spirit::unused_type> > >, 0l>, boost::spirit::qi::grammar<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>()>, boost::proto::domainns_::default_domain, 0l>::proto_is_expr_' is inaccessible
In file included from /opt/local/include/boost/proto/traits.hpp:32:0,
from /opt/local/include/boost/proto/expr.hpp:27,
from /opt/local/include/boost/proto/core.hpp:17,
from /opt/local/include/boost/proto/proto.hpp:12,
from /opt/local/include/boost/spirit/home/support/meta_compiler.hpp:19,
from /opt/local/include/boost/spirit/home/qi/meta_compiler.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi.hpp:14,
from /opt/local/include/boost/spirit/include/qi.hpp:16,
from ircparser.h:6,
from test.cpp:1:
/opt/local/include/boost/proto/domain.hpp:141:13: error: within this context
In file included from /opt/local/include/boost/proto/core.hpp:23:0,
from /opt/local/include/boost/proto/proto.hpp:12,
from /opt/local/include/boost/spirit/home/support/meta_compiler.hpp:19,
from /opt/local/include/boost/spirit/home/qi/meta_compiler.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi.hpp:14,
from /opt/local/include/boost/spirit/include/qi.hpp:16,
from ircparser.h:6,
from test.cpp:1:
/opt/local/include/boost/proto/extends.hpp:551:13: error: 'typedef void boost::proto::exprns_::extends<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::qi::reference<const boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>(), boost::spirit::unused_type, boost::spirit::unused_type, boost::spirit::unused_type> > >, 0l>, boost::spirit::qi::grammar<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>()>, boost::proto::domainns_::default_domain, 0l>::proto_is_expr_' is inaccessible
In file included from /opt/local/include/boost/proto/traits.hpp:32:0,
from /opt/local/include/boost/proto/expr.hpp:27,
from /opt/local/include/boost/proto/core.hpp:17,
from /opt/local/include/boost/proto/proto.hpp:12,
from /opt/local/include/boost/spirit/home/support/meta_compiler.hpp:19,
from /opt/local/include/boost/spirit/home/qi/meta_compiler.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi.hpp:14,
from /opt/local/include/boost/spirit/include/qi.hpp:16,
from ircparser.h:6,
from test.cpp:1:
/opt/local/include/boost/proto/domain.hpp:142:17: error: within this context
In file included from /opt/local/include/boost/proto/core.hpp:23:0,
from /opt/local/include/boost/proto/proto.hpp:12,
from /opt/local/include/boost/spirit/home/support/meta_compiler.hpp:19,
from /opt/local/include/boost/spirit/home/qi/meta_compiler.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi.hpp:14,
from /opt/local/include/boost/spirit/include/qi.hpp:16,
from ircparser.h:6,
from test.cpp:1:
/opt/local/include/boost/proto/extends.hpp:551:13: error: 'typedef void boost::proto::exprns_::extends<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::qi::reference<const boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>(), boost::spirit::unused_type, boost::spirit::unused_type, boost::spirit::unused_type> > >, 0l>, boost::spirit::qi::grammar<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>()>, boost::proto::domainns_::default_domain, 0l>::proto_is_expr_' is inaccessible
In file included from /opt/local/include/boost/proto/traits.hpp:32:0,
from /opt/local/include/boost/proto/expr.hpp:27,
from /opt/local/include/boost/proto/core.hpp:17,
from /opt/local/include/boost/proto/proto.hpp:12,
from /opt/local/include/boost/spirit/home/support/meta_compiler.hpp:19,
from /opt/local/include/boost/spirit/home/qi/meta_compiler.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi.hpp:14,
from /opt/local/include/boost/spirit/include/qi.hpp:16,
from ircparser.h:6,
from test.cpp:1:
/opt/local/include/boost/proto/domain.hpp:143:56: error: within this context
In file included from /opt/local/include/boost/proto/core.hpp:23:0,
from /opt/local/include/boost/proto/proto.hpp:12,
from /opt/local/include/boost/spirit/home/support/meta_compiler.hpp:19,
from /opt/local/include/boost/spirit/home/qi/meta_compiler.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi.hpp:14,
from /opt/local/include/boost/spirit/include/qi.hpp:16,
from ircparser.h:6,
from test.cpp:1:
/opt/local/include/boost/proto/extends.hpp:551:13: error: 'typedef void boost::proto::exprns_::extends<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::qi::reference<const boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>(), boost::spirit::unused_type, boost::spirit::unused_type, boost::spirit::unused_type> > >, 0l>, boost::spirit::qi::grammar<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>()>, boost::proto::domainns_::default_domain, 0l>::proto_is_expr_' is inaccessible
In file included from /opt/local/include/boost/proto/traits.hpp:32:0,
from /opt/local/include/boost/proto/expr.hpp:27,
from /opt/local/include/boost/proto/core.hpp:17,
from /opt/local/include/boost/proto/proto.hpp:12,
from /opt/local/include/boost/spirit/home/support/meta_compiler.hpp:19,
from /opt/local/include/boost/spirit/home/qi/meta_compiler.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi.hpp:14,
from /opt/local/include/boost/spirit/include/qi.hpp:16,
from ircparser.h:6,
from test.cpp:1:
/opt/local/include/boost/proto/domain.hpp:146:29: error: within this context
In file included from /opt/local/include/boost/proto/core.hpp:23:0,
from /opt/local/include/boost/proto/proto.hpp:12,
from /opt/local/include/boost/spirit/home/support/meta_compiler.hpp:19,
from /opt/local/include/boost/spirit/home/qi/meta_compiler.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi.hpp:14,
from /opt/local/include/boost/spirit/include/qi.hpp:16,
from ircparser.h:6,
from test.cpp:1:
/opt/local/include/boost/proto/extends.hpp:551:13: error: 'typedef void boost::proto::exprns_::extends<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::qi::reference<const boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>(), boost::spirit::unused_type, boost::spirit::unused_type, boost::spirit::unused_type> > >, 0l>, boost::spirit::qi::grammar<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>()>, boost::proto::domainns_::default_domain, 0l>::proto_is_expr_' is inaccessible
In file included from /opt/local/include/boost/proto/traits.hpp:32:0,
from /opt/local/include/boost/proto/expr.hpp:27,
from /opt/local/include/boost/proto/core.hpp:17,
from /opt/local/include/boost/proto/proto.hpp:12,
from /opt/local/include/boost/spirit/home/support/meta_compiler.hpp:19,
from /opt/local/include/boost/spirit/home/qi/meta_compiler.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi.hpp:14,
from /opt/local/include/boost/spirit/include/qi.hpp:16,
from ircparser.h:6,
from test.cpp:1:
/opt/local/include/boost/proto/domain.hpp:146:29: error: within this context
In file included from /opt/local/include/boost/proto/core.hpp:23:0,
from /opt/local/include/boost/proto/proto.hpp:12,
from /opt/local/include/boost/spirit/home/support/meta_compiler.hpp:19,
from /opt/local/include/boost/spirit/home/qi/meta_compiler.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi.hpp:14,
from /opt/local/include/boost/spirit/include/qi.hpp:16,
from ircparser.h:6,
from test.cpp:1:
/opt/local/include/boost/proto/extends.hpp:551:13: error: 'typedef void boost::proto::exprns_::extends<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::qi::reference<const boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>(), boost::spirit::unused_type, boost::spirit::unused_type, boost::spirit::unused_type> > >, 0l>, boost::spirit::qi::grammar<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>()>, boost::proto::domainns_::default_domain, 0l>::proto_is_expr_' is inaccessible
In file included from /opt/local/include/boost/proto/traits.hpp:32:0,
from /opt/local/include/boost/proto/expr.hpp:27,
from /opt/local/include/boost/proto/core.hpp:17,
from /opt/local/include/boost/proto/proto.hpp:12,
from /opt/local/include/boost/spirit/home/support/meta_compiler.hpp:19,
from /opt/local/include/boost/spirit/home/qi/meta_compiler.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi.hpp:14,
from /opt/local/include/boost/spirit/include/qi.hpp:16,
from ircparser.h:6,
from test.cpp:1:
/opt/local/include/boost/proto/domain.hpp:146:46: error: within this context
In file included from /opt/local/include/boost/proto/core.hpp:23:0,
from /opt/local/include/boost/proto/proto.hpp:12,
from /opt/local/include/boost/spirit/home/support/meta_compiler.hpp:19,
from /opt/local/include/boost/spirit/home/qi/meta_compiler.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi/action.hpp:14,
from /opt/local/include/boost/spirit/home/qi.hpp:14,
from /opt/local/include/boost/spirit/include/qi.hpp:16,
from ircparser.h:6,
from test.cpp:1:
/opt/local/include/boost/proto/matches.hpp: In instantiation of 'struct boost::proto::matches<irc::message_grammar, boost::spirit::meta_compiler<boost::spirit::qi::domain>::meta_grammar>':
/opt/local/include/boost/spirit/home/support/meta_compiler.hpp:221:16: required from 'struct boost::spirit::traits::matches<boost::spirit::qi::domain, irc::message_grammar>'
/opt/local/include/boost/spirit/home/qi/parse.hpp:155:9: required from 'bool boost::spirit::qi::phrase_parse(Iterator&, Iterator, const Expr&, const Skipper&, boost::spirit::qi::skip_flag, Attr&) [with Iterator = __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >; Expr = irc::message_grammar; Skipper = boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::tag::char_code<boost::spirit::tag::space, boost::spirit::char_encoding::standard> >, 0l>; Attr = std::basic_string<char>]'
/opt/local/include/boost/spirit/home/qi/parse.hpp:197:86: required from 'bool boost::spirit::qi::phrase_parse(Iterator&, Iterator, const Expr&, const Skipper&, Attr&) [with Iterator = __gnu_cxx::__normal_iterator<char*, std::basic_string<char> >; Expr = irc::message_grammar; Skipper = boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::tag::char_code<boost::spirit::tag::space, boost::spirit::char_encoding::standard> >, 0l>; Attr = std::basic_string<char>]'
test.cpp:20:25: required from here
/opt/local/include/boost/proto/extends.hpp:551:13: error: 'typedef struct boost::spirit::qi::grammar<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>()> boost::proto::exprns_::extends<boost::proto::exprns_::expr<boost::proto::tagns_::tag::terminal, boost::proto::argsns_::term<boost::spirit::qi::reference<const boost::spirit::qi::rule<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>(), boost::spirit::unused_type, boost::spirit::unused_type, boost::spirit::unused_type> > >, 0l>, boost::spirit::qi::grammar<__gnu_cxx::__normal_iterator<const char*, std::basic_string<char> >, std::basic_string<char>()>, boost::proto::domainns_::default_domain, 0l>::proto_derived_expr' is inaccessible
答案 0 :(得分：7)
您应该将message_grammar声明为结构而不是类。
此外，您可以从qi::grammar公开派生您的课程：
class message_grammar : public qi::grammar<std::string::const_iterator, std::string()>
{
}
你也可能会发现这个article很有用。