Re: [Boost-users] invalid conversion from 'bool

Subject: Re: [Boost-users] invalid conversion from 'bool
From: Eric Lin (kingdavid1_at_[hidden])
Date: 2011-07-19 02:09:33

________________________________
> Date: Tue, 19 Jul 2011 13:48:16 +0800 
> From: tongari95_at_[hidden] 
> To: boost-users_at_[hidden] 
> Subject: Re: [Boost-users] invalid conversion from 'bool 
>  
> 2011/7/19 Eric Lin <kingdavid1_at_[hidden]<mailto:kingdavid1_at_[hidden]>> 
>  
> Dear Advanced c/g++ on boost programers: 
>  
>    I have copied and testd a simple (Copy a file with Boost) program  
> from page 372, Example10-10, book(C++ cookbook) 
> but I got compile error 
> ----------------------------- 
> eric_at_eric-laptop:~/cppcookbook/ch10$ g++ Example10-10.cpp 
> Example10-10.cpp: In function ‘int main(int, char**)’: 
> Example10-10.cpp:17:47: error: invalid conversion from ‘bool (*)(const  
> std::string&)’ to ‘boost::enable_if_c<true, void>::type*’ 
> Example10-10.cpp:17:47: error:   initializing argument 2 of  
> ‘boost::filesystem3::path::path(const Source&, typename  
> boost::enable_if<boost::filesystem3::path_traits::is_pathable<typename  
> boost::decay<Source>::type> >::type*) [with Source = char*, typename  
> boost::enable_if<boost::filesystem3::path_traits::is_pathable<typename  
> boost::decay<Source>::type> >::type = void]’ 
> Example10-10.cpp:18:47: error: invalid conversion from ‘bool (*)(const  
> std::string&)’ to ‘boost::enable_if_c<true, void>::type*’ 
> Example10-10.cpp:18:47: error:   initializing argument 2 of  
> ‘boost::filesystem3::path::path(const Source&, typename  
> boost::enable_if<boost::filesystem3::path_traits::is_pathable<typename  
> boost::decay<Source>::type> >::type*) [with Source = char*, typename  
> boost::enable_if<boost::filesystem3::path_traits::is_pathable<typename  
> boost::decay<Source>::type> >::type = void]’ 

> ----------------------------- 
> This is my program, you can download and test by your self from 
> http://examples.oreilly.com/9780596007614/ 
> ----------------------------------------------------- 
> // Example 10-10.  Copying a file with Boost 
> #include <iostream> 
> #include <string> 
> #include <boost/filesystem/operations.hpp> 
> #include <boost/filesystem/fstream.hpp> 
> #include <boost/filesystem/path.hpp> 
>  
> using namespace std; 
> using namespace boost::filesystem; 
>  
> int main(int argc, char** argv) { 
>  
>     // Parameter checking... 
>  
>     try { 
>        // Turn the args into absolute paths using native formatting 
>        path src = complete(path(argv[1], native)); 
>        path dst = complete(path(argv[2], native)); 
>        copy_file(src, dst); 
>     } 
>     catch (exception& e) { 
>       cerr << e.what() << endl; 
>     } 
>  
>     return(EXIT_SUCCESS); 
> } 
> ---------------------------------------------------------------------------- 
> I ever check around web, there is some suggestion ask me to get rid  
> native, but in my test/system, it only 
> generate more errors. 
> my boost version probably is 1.46.1 
> and I am on g++ 4.5.2 and Ubuntu10.04/linuxKernel2.6.35-25 
> Need and thanks your help a lot in advance, Eric 
>  
> Removing the "native" does work well for me, what are the errors you  
> saw then? 
> Link errors? You must link against the boost filesystem & system lib. 

Thanks your reply, but how to (link against the boost filesystem & system lib)? I am on linux/g++
these are errors I got, after I eliminate native
----------------
eric_at_eric-laptop:~/cppcookbook/ch10$ g++ -lboost_system  Example10-10.cpp
/tmp/ccF2cJsO.o: In function `boost::filesystem3::path::codecvt()':
Example10-10.cpp:(.text._ZN5boost11filesystem34path7codecvtEv[boost::filesystem3::path::codecvt()]+0x7): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
/tmp/ccF2cJsO.o: In function `boost::filesystem3::complete(boost::filesystem3::path const&)':
Example10-10.cpp:(.text._ZN5boost11filesystem38completeERKNS0_4pathE[boost::filesystem3::complete(boost::filesystem3::path const&)]+0x2d): undefined reference to `boost::filesystem3::absolute(boost::filesystem3::path const&, boost::filesystem3::path const&)'
/tmp/ccF2cJsO.o: In function `boost::filesystem3::copy_file(boost::filesystem3::path const&, boost::filesystem3::path const&)':
Example10-10.cpp:(.text._ZN5boost11filesystem39copy_fileERKNS0_4pathES3_[boost::filesystem3::copy_file(boost::filesystem3::path const&, boost::filesystem3::path const&)]+0x24): undefined reference to `boost::filesystem3::detail::copy_file(boost::filesystem3::path const&, boost::filesystem3::path const&, boost::filesystem3::copy_option::enum_type, boost::system::error_code*)'
/tmp/ccF2cJsO.o: In function `boost::filesystem3::initial_path()':
Example10-10.cpp:(.text._ZN5boost11filesystem312initial_pathEv[boost::filesystem3::initial_path()]+0x18): undefined reference to `boost::filesystem3::detail::initial_path(boost::system::error_code*)'
collect2: ld returned 1 exit status
eric_at_eric-laptop:~/cppcookbook/ch10$
-------------------
looking to see any expert's help again and thank a lot in advance, Eric

>  
>  
> _______________________________________________ Boost-users mailing  
> list Boost-users_at_[hidden]  
> http://lists.boost.org/mailman/listinfo.cgi/boost-users