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From: Jonathan Turkanis (turkanis_at_[hidden])
Date: 2008-02-14 12:58:58

Next message: Jonathan Turkanis: "Re: [Boost-users] getline from boost::iostream::filtering_streambuf"
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Reply: Holger Bast: "Re: [Boost-users] getline from boost::iostream::filtering_streambuf"

Holger Bast wrote:
> --===============0292832754==
> Content-Type: multipart/alternative;
> boundary="----=_Part_3129_20232071.1202996981254"
>
> ------=_Part_3129_20232071.1202996981254
> Content-Type: text/plain; charset=ISO-8859-1
> Content-Transfer-Encoding: 7bit
> Content-Disposition: inline
>
> Hi All,
>
>
> - I have built STL5.1.4 with VC8.
>
>
> - boost against stlport with the following command -> make -
> fvc8-stlport.mak
>
>
> *It created all the necessary libs and dlls. *
>
>
> I have defined the following in my application.
>
> *#define __STL_DEBUG
> #define BOOST_REGEX_DYN_LINK
> *
> But I am still getting the following linker errors. Any one can help me
> with these errors ?
>
> *Appreciate your help in advance*
>
>
> Error 3 error LNK2019: unresolved external symbol
> "__declspec(dllimport) public: __thiscall boost::match_results<char const
> *,class stlp_std::allocator<struct boost::sub_match<char const *> >
>> ::~match_results<char const *,class stlp_std::allocator<struct
> boost::sub_match<char const *> > >(void)" (__imp_??1?$match_results@
> PBDV?$allocator_at_U?$sub_match_at_PBD@boost@@@stlp_std@@@boost@@QAE_at_XZ)
> referenced in function "public: static bool __cdecl
> ExprEvaluator::doesStringMatchRegExpr(char const *,class
> boost::basic_regex<char,struct boost::regex_traits<char,class
> boost::w32_regex_traits<char> > >)" (?doesStringMatchRegExpr_at_ExprEvaluator@@
> SA_NPBDV?$basic_regex_at_DU?$regex_traits_at_DV?$w32_regex_traits_at_D@boost@@@boost@@@boost@@@Z)
> ExprEvaluator.obj
> Error 4 error LNK2019: unresolved external symbol
> "__declspec(dllimport) public: __thiscall boost::match_results<char const
> *,class stlp_std::allocator<struct boost::sub_match<char const *> >
>> ::match_results<char const *,class stlp_std::allocator<struct
> boost::sub_match<char const *> > >(class stlp_std::allocator<struct
> boost::sub_match<char const *> > const &)" (__imp_??0?$match_results@
> PBDV?$allocator_at_U?$sub_match_at_PBD@boost@@@stlp_std@@@boost@@QAE_at_ABV
> ?$allocator_at_U?$sub_match_at_PBD@boost@@@stlp_std@@@Z) referenced in function
> "public: static bool __cdecl ExprEvaluator::doesStringMatchRegExpr(char
> const *,class boost::basic_regex<char,struct boost::regex_traits<char,class
> boost::w32_regex_traits<char> > >)" (?doesStringMatchRegExpr_at_ExprEvaluator@@
> SA_NPBDV?$basic_regex_at_DU?$regex_traits_at_DV?$w32_regex_traits_at_D@boost@@@boost@@@boost@@@Z)
> ExprEvaluator.obj
> Error 5 error LNK2019: unresolved external symbol
> "__declspec(dllimport) public: __thiscall
> boost::re_detail::perl_matcher<char const *,class stlp_std::allocator<struct
> boost::sub_match<char const *> >,struct boost::regex_traits<char,class
> boost::w32_regex_traits<char> > >::~perl_matcher<char const *,class
> stlp_std::allocator<struct boost::sub_match<char const *> >,struct
> boost::regex_traits<char,class boost::w32_regex_traits<char> > >(void)"
> (__imp_??1?$perl_matcher_at_PBDV?$allocator_at_U?$sub_match_at_PBD@boost@@@stlp_std@@
> U?$regex_traits_at_DV?$w32_regex_traits_at_D@boost@@@boost@@@re_detail_at_boost@@
> QAE_at_XZ) referenced in function "bool __cdecl boost::regex_match<char const
> *,class stlp_std::allocator<struct boost::sub_match<char const *>
>> ,char,struct boost::regex_traits<char,class boost::w32_regex_traits<char> >
>> (char const *,char const *,class boost::match_results<char const *,class
> stlp_std::allocator<struct boost::sub_match<char const *> > > &,class
> boost::basic_regex<char,struct boost::regex_traits<char,class
> boost::w32_regex_traits<char> > > const &,enum
> boost::regex_constants::_match_flags)" (??$regex_match_at_PBDV?$allocator_at_U
> ?$sub_match_at_PBD@boost@@@stlp_std@@DU?$regex_traits_at_DV?$w32_regex_traits@
> D_at_boost@@@boost@@@boost@@YA_NPBD0AAV?$match_results_at_PBDV?$allocator@
> U?$sub_match_at_PBD@boost@@@stlp_std@@@0_at_ABV?$basic_regex_at_DU?$regex_traits_at_DV
> ?$w32_regex_traits_at_D@boost@@@boost@@@0_at_W4_match_flags_at_regex_constants_at_0@@Z)
> ExprEvaluator.obj
> Error 6 error LNK2019: unresolved external symbol
> "__declspec(dllimport) public: bool __thiscall
> boost::re_detail::perl_matcher<char const *,class stlp_std::allocator<struct
> boost::sub_match<char const *> >,struct boost::regex_traits<char,class
> boost::w32_regex_traits<char> > >::match(void)"
> (__imp_?match@?$perl_matcher_at_PBDV?$allocator_at_U?$sub_match_at_PBD@boost
> @@@stlp_std@@U?$regex_traits_at_DV?$w32_regex_traits_at_D@boost@@@boost@@@
> re_detail_at_boost@@QAE_NXZ) referenced in function "bool __cdecl
> boost::regex_match<char const *,class stlp_std::allocator<struct
> boost::sub_match<char const *> >,char,struct boost::regex_traits<char,class
> boost::w32_regex_traits<char> > >(char const *,char const *,class
> boost::match_results<char const *,class stlp_std::allocator<struct
> boost::sub_match<char const *> > > &,class boost::basic_regex<char,struct
> boost::regex_traits<char,class boost::w32_regex_traits<char> > > const
> &,enum boost::regex_constants::_match_flags)" (??$regex_match@
> PBDV?$allocator_at_U?$sub_match_at_PBD@boost@@@stlp_std@@DU?$regex_traits_at_DV
> ?$w32_regex_traits_at_D@boost@@@boost@@@boost@@YA_NPBD0AAV?$match_results_at_PBDV
> ?$allocator_at_U?$sub_match_at_PBD@boost@@@stlp_std@@@0_at_ABV?$basic_regex@
> DU?$regex_traits_at_DV?$w32_regex_traits_at_D@boost@@@boost@@@0_at_W4_match_flags@
> regex_constants_at_0@@Z) ExprEvaluator.obj
> Error 7 error LNK2019: unresolved external symbol
> "__declspec(dllimport) public: __thiscall
> boost::re_detail::perl_matcher<char const *,class stlp_std::allocator<struct
> boost::sub_match<char const *> >,struct boost::regex_traits<char,class
> boost::w32_regex_traits<char> > >::perl_matcher<char const *,class
> stlp_std::allocator<struct boost::sub_match<char const *> >,struct
> boost::regex_traits<char,class boost::w32_regex_traits<char> > >(char const
> *,char const *,class boost::match_results<char const *,class
> stlp_std::allocator<struct boost::sub_match<char const *> > > &,class
> boost::basic_regex<char,struct boost::regex_traits<char,class
> boost::w32_regex_traits<char> > > const &,enum
> boost::regex_constants::_match_flags,char const *)"
> (__imp_??0?$perl_matcher_at_PBDV?$allocator_at_U?$sub_match_at_PBD@boost@@@stlp_std@@
> U?$regex_traits_at_DV?$w32_regex_traits_at_D@boost@@@boost@@@re_detail_at_boost@@
> QAE_at_PBD0AAV?$match_results_at_PBDV?$allocator_at_U?$sub_match_at_PBD@boost
> @@@stlp_std@@@2_at_ABV?$basic_regex_at_DU?$regex_traits_at_DV?$w32_regex_traits@
> D_at_boost@@@boost@@@2_at_W4_match_flags_at_regex_constants_at_2@0_at_Z) referenced in
> function "bool __cdecl boost::regex_match<char const *,class
> stlp_std::allocator<struct boost::sub_match<char const *> >,char,struct
> boost::regex_traits<char,class boost::w32_regex_traits<char> > >(char const
> *,char const *,class boost::match_results<char const *,class
> stlp_std::allocator<struct boost::sub_match<char const *> > > &,class
> boost::basic_regex<char,struct boost::regex_traits<char,class
> boost::w32_regex_traits<char> > > const &,enum
> boost::regex_constants::_match_flags)" (??$regex_match_at_PBDV?$allocator_at_U
> ?$sub_match_at_PBD@boost@@@stlp_std@@DU?$regex_traits_at_DV?$w32_regex_traits@
> D_at_boost@@@boost@@@boost@@YA_NPBD0AAV?$match_results_at_PBDV?$allocator@
> U?$sub_match_at_PBD@boost@@@stlp_std@@@0_at_ABV?$basic_regex_at_DU?$regex_traits_at_DV
> ?$w32_regex_traits_at_D@boost@@@boost@@@0_at_W4_match_flags_at_regex_constants_at_0@@Z)
> ExprEvaluator.obj
>
>
> thanks & regards
> Srinivas Chamarthi
>
> ------=_Part_3129_20232071.1202996981254
> Content-Type: text/html; charset=ISO-8859-1
> Content-Transfer-Encoding: quoted-printable
> Content-Disposition: inline
>
> Hi All,<br><br><ul><li>I have built STL5.1.4 with VC8. </li></ul><ul><li>bo=
> Path: news.gmane.org!not-for-mail
> From: Holger Bast <bast_at_[hidden]>
> Newsgroups: gmane.comp.lib.boost.user
> Subject: getline from boost::iostream::filtering_streambuf
> Date: Thu, 14 Feb 2008 08:40:11 +0100
> Lines: 26
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> Cc: Holger Bast <bast_at_[hidden]>
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>
> I want to read line by line from a gzipped document.
>
> I first do:
>
> std::ifstream file(fileName.c_str());
> boost::iostreams::filtering_streambuf<boost::iostreams::input> in;
> in.push(boost::iostreams::gzip_decompressor());
> in.push(documentFile);
>
> However, then the obvious:
>
> string line;
> while(std::getline(in, line)) { ... }
>
> does not compile.
>
> Is there really no getline for filtering_streambuf?

getline() is provided by the C++ standard library for use with input
streams. The above should compile if you use filtering_stream instead of
filtering_streambuf (and possibly make some unrelated changes -- e.g.,
it doesn't look like "documentFile" is defined).

> If not, what is the best way to write one?

You shouldn't need to.

> I tried reading character by character using boost::iostream::get(in)
> but that looks terribly inefficient to me, and is not nice code.

boost::iostreams::get() just calls streambuf::sgetc() in this case. It
is just as efficient as calling sgetc() directly, if you are using an
optimizing compiler.

> Thanks for your help,
>
> Holger

-- 
Jonathan Turkanis
CodeRage
http://www.coderage.com

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