Re: [Boost-users] Boost-users Digest, Vol 2359, Issue 1

Subject: Re: [Boost-users] Boost-users Digest, Vol 2359, Issue 1
From: Mauricio Gomes (mgpensar_at_[hidden])
Date: 2010-05-14 12:12:14

  Hi Harmut,

Did you uncomment the line:
//#include <boost/spirit/include/qi_no_skip.hpp> ?

It is commented out in the code below. If I include this line, compilation
fails.
You also have to check optimizations because the code below is not using
no_skip[] in the grammar so there is a chance that a smart compiler that is
not in debug mode might ignore the non-used code.
In my case I am in debug mode, no optmizations and including the
qi_no_skip.hpp header suffices to get the error.

Thanks for your attention !

1. Re: Spirit: parsing tab separated values and      no_skip

>      compilation error. (Hartmut Kaiser)
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 13 May 2010 18:28:19 -0500
> From: "Hartmut Kaiser" <hartmut.kaiser_at_[hidden]>
> To: <boost-users_at_[hidden]>
> Subject: Re: [Boost-users] Spirit: parsing tab separated values and
>        no_skip compilation error.
> Message-ID: <0d5301caf2f3$fa1c64e0$ee552ea0$@gmail.com>
> Content-Type: text/plain;       charset="iso-8859-1"
>
> > I am a beginner with Spirit. I just read the tutorial and I am playing
> > around with some examples.
> > Environment: boost 1.43, Windows Vista, Code::Blocks, mingw, gcc 4.5.
> >
> > My goal is to build a tab separated values parser.
> > If you have an example on how to parse something like:
> > string/t/tdouble/tdouble
> > it would be great. Contiguous tabs should be considered as one tab, not
> an
> > empty field.
> >
> > To start I just tried to parse a tab separated list of strings but I am
> > having some difficulties.
> >
> > Is there another skip parser to be used instead of space (for full code
> > see the end of the message below) ?
> > I have changed the commas to tabs in the code below but it failed. I
> guess
> > it was because it was skipping them (space skipper).
> >
> > ??????? bool r = phrase_parse(first, last,
> >
> > ??????????? //? Begin grammar
> > ??????????? (
> > ??????????????? +(char_ - ',') % ','
> > ??????????? )
> > ??????????? ,
> > ??????????? //? End grammar
> >
> > ??????????? space, v);
> >
> > This code works with commas but it fails with '\t'.
> >
> > I tried to use no_skip[] but it failed to compile the header #include
> > <boost/spirit/include/qi_no_skip.hpp>:
> >
> > C:\boost_1_43_0\boost\spirit\home\qi\directive\no_skip.hpp|30|error:
> > 'no_skip' is not a member of 'boost::spirit::tag'|
> >
> > For full error message see the end of the message below.
> >
> > Any suggestions ?
> >
> > Thank you for your attention,
> > Mau.
> >
> > #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_stl.hpp>
> > //#include <boost/spirit/include/qi_no_skip.hpp>
> >
> > #include <iostream>
> > #include <string>
> > #include <vector>
> >
> > #define VECTOR_TYPE std::string
> >
> > namespace client
> > {
> > ??? namespace qi = boost::spirit::qi;
> > ??? namespace ascii = boost::spirit::ascii;
> >
> > ???
> //////////////////////////////////////////////////////////////////////
> > /////
> > ??? //? Our number list compiler
> > ???
> //////////////////////////////////////////////////////////////////////
> > /////
> > ??? //[tutorial_numlist4
> > ??? template <typename Iterator>
> > ??? bool parse_numbers(Iterator first, Iterator last,
> > std::vector<VECTOR_TYPE>& v)
> > ??? {
> > ??????? using qi::double_;
> > ??????? using qi::phrase_parse;
> > ??????? using qi::_1;
> > ??????? using ascii::space;
> > ??????? using qi::char_;
> >
> > ??????? bool r = phrase_parse(first, last,
> >
> > ??????????? //? Begin grammar
> > ??????????? (
> > ??????????????? +(char_ - ',') % ','
> > ??????????? )
> > ??????????? ,
> > ??????????? //? End grammar
> >
> > ??????????? space, v);
> >
> > ??????? if (first != last) // fail if we did not get a full match
> > ??????????? return false;
> > ??????? return r;
> > ??? }
> > ??? //]
> > }
> >
> >
> //////////////////////////////////////////////////////////////////////////
> > //
> > //? Main program
> >
> //////////////////////////////////////////////////////////////////////////
> > //
> > int
> > main()
> > {
> > ??? std::cout <<
> > "/////////////////////////////////////////////////////////\n\n";
> > ??? std::cout << "\t\tA comma separated list parser for Spirit...\n\n";
> > ??? std::cout <<
> > "/////////////////////////////////////////////////////////\n\n";
> >
> > ??? std::cout << "Give me a comma separated list of numbers.\n";
> > ??? std::cout << "The numbers will be inserted in a vector of numbers\n";
> > ??? std::cout << "Type [q or Q] to quit\n\n";
> >
> > ??? std::string str;
> > ??? while (getline(std::cin, str))
> > ??? {
> > ??????? if (str.empty() || str[0] == 'q' || str[0] == 'Q')
> > ??????????? break;
> >
> > ??????? std::vector<VECTOR_TYPE> v;
> > ??????? if (client::parse_numbers(str.begin(), str.end(), v))
> > ??????? {
> > ??????????? std::cout << "-------------------------\n";
> > ??????????? std::cout << "Parsing succeeded\n";
> > ??????????? std::cout << str << " Parses OK: " << std::endl;
> >
> > ??????????? for (std::vector<VECTOR_TYPE>::size_type i = 0; i < v.size();
> > ++i)
> > ??????????????? std::cout << i << ": " << v[i] << 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;
> > }
>
> This example compiles fine for me (VC10, g++ 4.5). Is it supposed to fail?
>
> Regards Hartmut
>
> ---------------
> Meet me at BoostCon
> www.boostcon.com
>
>
>
>
>