Question

我有一个巨大的语法用于xml解析，但是在pre 2.x boost精神中写了一段时间。我想要稍微有意义的错误消息，所以我想说：

#include <boost/spirit/core.hpp>
#include <boost/spirit/iterator/multi_pass.hpp>

const char* sourcefile;

typedef const char* base_iteratory_type
typedef boost::spirit::multi_pass<base_iterator_type> forward_iterator_type;
typedef boost::spirit::position_iterator2<forward_iterator_type> pos_iterator_t;

base_iterator_type begin(m_document.c_str());
base_iterator_type end = m_document.c_str() + m_document.size();

forward_iterator_type fwd_begin = boost::spirit::make_multi_pass(begin);
forward_iterator_type fwd_end;

pos_iterator_t pos_begin(fwd_begin, fwd_end, sourcefile);
pos_iterator_t pos_end;

try{
parse(pos_begin, pos_end, document_p);
}
catch(const boost::spirit::qi::expectation_failure<pos_iterator_t>& e)
{
//retrieve info from e.first.get_position of type file_position_base;
}

然而，这并没有在捕获异常的行上编译错误并抱怨expected unqualified-id before :: token ...我可以在2.x之前的精神中解决这个问题吗？所谓的“经典”界面？如果是这样，需要进行哪些修改？

Answer 1

AFAICT expectal_failure类在经典精神中不存在：

http://www.boost.org/doc/libs/1_41_0/libs/spirit/classic/doc/error_handling.html

您需要查看explcitily指定的parse_error，例如来自boost 1.41的 error_handling.cpp sample 。

此外，如果有人想花更多时间在上面的例子上工作，这里有一个实际编译的修改版本（以破坏的异常处理为模）：

#include <boost/spirit/include/classic_core.hpp>
#include <boost/spirit/include/classic_multi_pass.hpp>
#include <boost/spirit/include/classic_position_iterator.hpp>

typedef const char* base_iterator_type;
typedef boost::spirit::classic::multi_pass<base_iterator_type> forward_iterator_type;
typedef boost::spirit::classic::position_iterator2<forward_iterator_type> pos_iterator_t;

int main()
{
    const char* sourcefile;


    std::string m_document;
    base_iterator_type begin(m_document.c_str());
    base_iterator_type end = m_document.c_str() + m_document.size();

    forward_iterator_type fwd_begin = boost::spirit::classic::make_multi_pass(begin);
    forward_iterator_type fwd_end;

    pos_iterator_t pos_begin(fwd_begin, fwd_end, sourcefile);
    pos_iterator_t pos_end;

    try{
        parse(pos_begin, pos_end, boost::spirit::classic::real_p);
    }
    catch(...) {}
    //catch(const boost::spirit::classic::expectation_failure<pos_iterator_t>& e)
    //{
        ////retrieve info from e.first.get_position of type file_position_base;
    //}

}

如何在2.x前提升精神中编译这个想法？

1 个答案: