[Boost-users] Simple XML parser - error handling - line number

Subject: [Boost-users] Simple XML parser - error handling - line number
From: AndrzejB (borucki.andrzej_at_[hidden])
Date: 2018-06-29 18:43:30

I see tutorial sample:
https://www.boost.org/doc/libs/1_67_0/libs/spirit/example/qi/mini_xml3.cpp
<https://www.boost.org/doc/libs/1_67_0/libs/spirit/example/qi/mini_xml3.cpp>  
                        on_error<fail>
                                (
                                        xml
                                        , std::cout
                                        << val("Error! Expecting ")
                                        << _4                               // what failed?
                                        << val(" here: \"")
                                        << construct<std::string>(_3, _2)   // iterators to error-pos, end
                                        << val("\"")
                                        << std::endl
                                        );
How print line number, or how print _2 and _3 . If I write _2 instead _4, is
compiler error.

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