Re: [Boost-users] [uuid] to string problem

Subject: Re: [Boost-users] [uuid] to string problem
From: Saygin Arkan (saygenius_at_[hidden])
Date: 2010-05-12 04:24:57

I've done exactly the same thing, using lexical. Here's my method:

string GeneratorUtils::getRandomID(){

    random_generator gen;
    uuid u = gen();

    string str = boost::lexical_cast<std::string>(u);

    return 0;
}

And I've received the errors belove.
I have 2 ideas about the problem:
1 - did I do something wrong while installing boost?
2 - did I do something wrong while compiling? I've just written g++ -c
GeneratorClasses.h GeneratorClasses.cpp and after this command here's the
output:

/usr/local/include/boost/lexical_cast.hpp: In member function ‘bool
boost::detail::lexical_stream<Target, Source, Traits>::operator<<(const
Source&) [with Target = std::basic_string<char, std::char_traits<char>,
std::allocator<char> >, Source = boost::uuids::uuid, Traits =
std::char_traits<char>]’:
/usr/local/include/boost/lexical_cast.hpp:1151:   instantiated from ‘Target
boost::detail::lexical_cast(typename boost::call_traits<Source>::param_type,
CharT*, size_t) [with Target = std::basic_string<char,
std::char_traits<char>, std::allocator<char> >, Source = boost::uuids::uuid,
bool Unlimited = true, CharT = boost::lexical_cast::char_type]’
/usr/local/include/boost/lexical_cast.hpp:1174:   instantiated from ‘Target
boost::lexical_cast(const Source&) [with Target = std::basic_string<char,
std::char_traits<char>, std::allocator<char> >, Source =
boost::uuids::uuid]’
GeneratorClasses.cpp:93:   instantiated from here
/usr/local/include/boost/lexical_cast.hpp:595: error: no match for
‘operator<<’ in ‘((boost::detail::lexical_stream<std::basic_string<char,
std::char_traits<char>, std::allocator<char> >, boost::uuids::uuid,
std::char_traits<char>
>*)this)->boost::detail::lexical_stream<std::basic_string<char,
std::char_traits<char>, std::allocator<char> >, boost::uuids::uuid,
std::char_traits<char> >::stream << input’
/usr/include/c++/4.4/ostream:108: note: candidates are:
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(std::basic_ostream<_CharT, _Traits>&
(*)(std::basic_ostream<_CharT, _Traits>&)) [with _CharT = char, _Traits =
std::char_traits<char>]
/usr/include/c++/4.4/ostream:117: note:
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(std::basic_ios<_CharT, _Traits>&
(*)(std::basic_ios<_CharT, _Traits>&)) [with _CharT = char, _Traits =
std::char_traits<char>]
/usr/include/c++/4.4/ostream:127: note:
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(std::ios_base& (*)(std::ios_base&)) [with _CharT =
char, _Traits = std::char_traits<char>]
/usr/include/c++/4.4/ostream:165: note:
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(long int) [with _CharT = char, _Traits =
std::char_traits<char>]
/usr/include/c++/4.4/ostream:169: note:
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(long unsigned int) [with _CharT = char, _Traits =
std::char_traits<char>]
/usr/include/c++/4.4/ostream:173: note:
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(bool) [with _CharT = char, _Traits =
std::char_traits<char>]
/usr/include/c++/4.4/bits/ostream.tcc:91: note:
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(short int) [with _CharT = char, _Traits =
std::char_traits<char>]
/usr/include/c++/4.4/ostream:180: note:
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(short unsigned int) [with _CharT = char, _Traits =
std::char_traits<char>]
/usr/include/c++/4.4/bits/ostream.tcc:105: note:
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(int) [with _CharT = char, _Traits =
std::char_traits<char>]
/usr/include/c++/4.4/ostream:191: note:
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(unsigned int) [with _CharT = char, _Traits =
std::char_traits<char>]
/usr/include/c++/4.4/ostream:200: note:
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(long long int) [with _CharT = char, _Traits =
std::char_traits<char>]
/usr/include/c++/4.4/ostream:204: note:
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(long long unsigned int) [with _CharT = char, _Traits =
std::char_traits<char>]
/usr/include/c++/4.4/ostream:209: note:
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(double) [with _CharT = char, _Traits =
std::char_traits<char>]
/usr/include/c++/4.4/ostream:213: note:
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(float) [with _CharT = char, _Traits =
std::char_traits<char>]
/usr/include/c++/4.4/ostream:221: note:
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(long double) [with _CharT = char, _Traits =
std::char_traits<char>]
/usr/include/c++/4.4/ostream:225: note:
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(const void*) [with _CharT = char, _Traits =
std::char_traits<char>]
/usr/include/c++/4.4/bits/ostream.tcc:119: note:
std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT,
_Traits>::operator<<(std::basic_streambuf<_CharT, _Traits>*) [with _CharT =
char, _Traits = std::char_traits<char>]

On Mon, May 10, 2010 at 11:04 PM, Andy Tompkins <atompkins_at_[hidden]>wrote:

>  On Mon, 10 May 2010 14:26 +0300, "Saygin Arkan" <saygenius_at_[hidden]>
> wrote:
>
> Hi,
> I'm a newbie on boost.
> I've downloaded and used some features.
>
> I couldn't find how to cast uuid into string.
>
> #include "boost/date_time/gregorian/gregorian.hpp"
> #include <boost/uuid/uuid.hpp>
> #include <boost/uuid/uuid_generators.hpp>
> #include <boost/uuid/random_generator.hpp>
> #include <boost/uuid/string_generator.hpp>
>
> ...
>
> date GeneratorUtils::getRandomDate() {
>     int year, month ,day;
>     day = rand() % 30;
>     month = rand() % 12;
>     year = 1980 + rand() % 25;
>     string str_date = "" + day + month + year ;
>     date d(from_simple_string(str_date));
>
>     return d;
>
> string GeneratorUtils::getRandomID(){
>
>     random_generator gen;
>     uuid u = gen();
>
>     return u.uuid_to_string(); // ERROR
> }
>
>
> It does not accept any to_string() function. Is there a way to convert from
> uuid to string in C++?
> (by the way, I can use the other things such as date d, uuid u etc.)
>
>
>  see
> http://www.boost.org/doc/libs/1_43_0/libs/uuid/uuid.html#boost/uuid/uuid_io.hpp
> one can also use lexical_cast eg:
>
> uuid u;
> string s = lexical_cast<string>(u);
>
> I'll update the documentation to include this example.
>
> Regards,
> Andy.
>
> _______________________________________________
> Boost-users mailing list
> Boost-users_at_[hidden]
> http://lists.boost.org/mailman/listinfo.cgi/boost-users
>

-- 
Saygin