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Boost Users : |
Subject: Re: [Boost-users] Program Options of Filesystem Path's - confused!
From: John Dlugosz (JDlugosz_at_[hidden])
Date: 2010-08-16 17:58:03
> > lexical_cast<fs::wpath>(fs::wpath("the path that fails"))
Making the string literal a L-string (L"the path that fails"), it won't compile. The spiel is attached at the end of this message.
> >
> > If that fails, it means operator>> is mishandling spaces in paths.
>
> lexical_cast<fs::wpath>("the path that fails")
>
Correcting to make the string L, it throws an exception "bad lexical cast: source type value could not be interpreted as target"
You ask if it's version 2 or version 3 of the fs library:
It doesn't say! However, the href for the docs says "this is version 2", which was "default for Boost 1.44 only". But I have Boost 1.43. The headers don't show version numbers, but do show a date of 2005. Should I move to version 3? I guess Boost 1.44 is hot off the press so it's normal enough that I don't have it?
===
Compiler output for line 13 which is
fs::wpath p1= lexical_cast<fs::wpath>(fs::wpath(L"the first path that fails"));
Microsoft (R) C/C++ Optimizing Compiler Version 15.00.30729.01 for x64
Copyright (C) Microsoft Corporation. All rights reserved.
fs_test.cpp
D:\boost_1_43_0\boost\lexical_cast.hpp(595) : error C2679: binary '<<' : no operator found which takes a right-hand operand of type 'const src' (or there is no acceptable conversion)
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(653): could be 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(700): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<char,std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(738): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const char *)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(785): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,char)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(909): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const signed char *)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(916): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,signed char)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(923): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,const unsigned char *)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(930): or 'std::basic_ostream<_Elem,_Traits> &std::operator <<<std::char_traits<char>>(std::basic_ostream<_Elem,_Traits> &,unsigned char)' [found using argument-dependent lookup]
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
D:\boost_1_43_0\boost/filesystem/path.hpp(584): or 'std::basic_ostream<_Elem,_Traits> &boost::filesystem::operator <<<T>(std::basic_ostream<_Elem,_Traits> &,const Path &)' [found using argument-dependent lookup]
with
[
_Elem=wchar_t,
_Traits=std::char_traits<wchar_t>,
T=src,
Path=src
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(170): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::basic_ostream<_Elem,_Traits> &(__cdecl *)(std::basic_ostream<_Elem,_Traits> &))'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(176): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::basic_ios<_Elem,_Traits> &(__cdecl *)(std::basic_ios<_Elem,_Traits> &))'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(183): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::ios_base &(__cdecl *)(std::ios_base &))'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(190): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::_Bool)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(210): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(short)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(243): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned short)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(263): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(int)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(288): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned int)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(308): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(long)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(328): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned long)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(349): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(__int64)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(369): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(unsigned __int64)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(390): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(float)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(410): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(double)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(430): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(long double)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(450): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(const void *)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\INCLUDE\ostream(470): or 'std::basic_ostream<_Elem,_Traits> &std::basic_ostream<_Elem,_Traits>::operator <<(std::basic_streambuf<_Elem,_Traits> *)'
with
[
_Elem=char,
_Traits=std::char_traits<char>
]
while trying to match the argument list '(std::basic_stringstream<_Elem,_Traits,_Alloc>, const src)'
with
[
_Elem=char,
_Traits=std::char_traits<char>,
_Alloc=std::allocator<char>
]
D:\boost_1_43_0\boost\lexical_cast.hpp(594) : while compiling class template member function 'bool boost::detail::lexical_stream<Target,Source,Traits>::operator <<(const Source &)'
with
[
Target=boost::filesystem::wpath,
Source=src,
Traits=traits
]
D:\boost_1_43_0\boost\lexical_cast.hpp(1148) : see reference to class template instantiation 'boost::detail::lexical_stream<Target,Source,Traits>' being compiled
with
[
Target=boost::filesystem::wpath,
Source=src,
Traits=traits
]
D:\boost_1_43_0\boost\lexical_cast.hpp(1174) : see reference to function template instantiation 'Target boost::detail::lexical_cast<Target,src,true,char_type>(const boost::filesystem::basic_path<String,Traits> &,CharT *,size_t)' being compiled
with
[
Target=boost::filesystem::wpath,
String=std::wstring,
Traits=boost::filesystem::wpath_traits,
CharT=char_type
]
fs_test.cpp(13) : see reference to function template instantiation 'Target boost::lexical_cast<boost::filesystem::wpath,boost::filesystem::basic_path<String,Traits>>(const Source &)' being compiled
with
[
Target=boost::filesystem::wpath,
String=std::wstring,
Traits=boost::filesystem::wpath_traits,
Source=boost::filesystem::basic_path<std::wstring,boost::filesystem::wpath_traits>
]
D:\boost_1_43_0\boost\lexical_cast.hpp(595) : error C2228: left of '.fail' must have class/struct/union
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