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@fastmail.fm>wrote:
On Mon, 10 May 2010 14:26 +0300, "Saygin Arkan" <saygenius@gmail.com> 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.... 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.
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-- Saygin