[Boost-users] Serializing UUIDs into text archives

Subject: [Boost-users] Serializing UUIDs into text archives
From: Matthias Vallentin (vallentin_at_[hidden])
Date: 2012-03-06 20:16:10

Serializing a UUID into a boost::archive::binary_[io]archive works fine.
However, when changing to a text archive, I get a compiler error with
gcc 4.7 in C++11 mode on Darwin. Here is a small example:

    #include <boost/archive/text_oarchive.hpp>
    #include <boost/iostreams/device/back_inserter.hpp>
    #include <boost/iostreams/filtering_stream.hpp>
    #include <boost/uuid/uuid_generators.hpp>
    #include <boost/uuid/uuid_serialize.hpp>

    int main()
    {
        std::vector<char> v;
        boost::iostreams::filtering_ostream
stream(boost::iostreams::back_inserter(v));
        boost::archive::text_oarchive oa(stream);

        boost::uuids::uuid id = boost::uuids::random_generator()();
        oa << id;

        return 0;
    }

The error is in basic_text_oprimitive line 92:

    cannot bind 'std::basic_ostream<char>' lvalue to
'std::basic_ostream<char>&&'

Any ideas what's going on? (I attached the full error message below.)

    Matthias

In file included from /opt/local/include/boost/archive/text_oarchive.hpp:30:0,
                 from test.cc:2:
/opt/local/include/boost/archive/basic_text_oprimitive.hpp: In
instantiation of 'void
boost::archive::basic_text_oprimitive<OStream>::save(const T&) [with T
= boost::uuids::uuid; OStream = std::basic_ostream<char>]':
/opt/local/include/boost/archive/text_oarchive.hpp:61:9:   required
from 'void boost::archive::text_oarchive_impl<Archive>::save(const T&)
[with T = boost::uuids::uuid; Archive =
boost::archive::text_oarchive]'
/opt/local/include/boost/archive/detail/oserializer.hpp:88:9:
required from 'static void
boost::archive::save_access::save_primitive(Archive&, const T&) [with
Archive = boost::archive::text_oarchive; T = boost::uuids::uuid]'
/opt/local/include/boost/archive/detail/oserializer.hpp:232:13:
required from 'static void
boost::archive::detail::save_non_pointer_type<Archive>::save_primitive::invoke(Archive&,
const T&) [with T = boost::uuids::uuid; Archive =
boost::archive::text_oarchive]'
/opt/local/include/boost/archive/detail/oserializer.hpp:308:9:
required from 'static void
boost::archive::detail::save_non_pointer_type<Archive>::invoke(Archive&,
const T&) [with T = boost::uuids::uuid; Archive =
boost::archive::text_oarchive]'
/opt/local/include/boost/archive/detail/oserializer.hpp:314:9:
required from 'static void
boost::archive::detail::save_non_pointer_type<Archive>::invoke(Archive&,
T&) [with T = boost::uuids::uuid; Archive =
boost::archive::text_oarchive]'
/opt/local/include/boost/archive/detail/oserializer.hpp:525:5:
required from 'void boost::archive::save(Archive&, T&) [with Archive =
boost::archive::text_oarchive; T = boost::uuids::uuid]'
/opt/local/include/boost/archive/detail/common_oarchive.hpp:69:9:
required from 'void
boost::archive::detail::common_oarchive<Archive>::save_override(T&,
int) [with T = boost::uuids::uuid; Archive =
boost::archive::text_oarchive]'
/opt/local/include/boost/archive/basic_text_oarchive.hpp:80:9:
required from 'void
boost::archive::basic_text_oarchive<Archive>::save_override(T&, int)
[with T = boost::uuids::uuid; Archive =
boost::archive::text_oarchive]'
/opt/local/include/boost/archive/detail/interface_oarchive.hpp:63:9:
required from 'Archive&
boost::archive::detail::interface_oarchive<Archive>::operator<<(T&)
[with T = boost::uuids::uuid; Archive =
boost::archive::text_oarchive]'
test.cc:15:11:   required from here
/opt/local/include/boost/archive/basic_text_oprimitive.hpp:92:9:
error: cannot bind 'std::basic_ostream<char>' lvalue to
'std::basic_ostream<char>&&'
In file included from /opt/local/include/boost/archive/text_oarchive.hpp:19:0,
                 from test.cc:2:
/opt/local/include/gcc47/c++/ostream:600:5: error:   initializing
argument 1 of 'std::basic_ostream<_CharT, _Traits>&
std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&)
[with _CharT = char; _Traits = std::char_traits<char>; _Tp =
boost::uuids::uuid]'