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

Subject: Re: [Boost-users] invalid conversion from 'bool
From: TONGARI (tongari95_at_[hidden])
Date: 2011-07-19 01:48:16

2011/7/19 Eric Lin <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]’
> Example10-10.cpp:18:48: error: expected ‘)’ before ‘;’ token
> -----------------------------
> 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.