id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
6091,Not documented requirement about I/O operators,Mateusz Loskot,Joel de Guzman,"The Fusion documentation in Boost 1.47 does not mention that in order to make Fusion-adapted types usable with input and output operators, it is necessary to import these operators into type's namespace.

The problem is discussed in the thread [http://lists.boost.org/boost-users/2011/11/71518.php Adapted struct I/O].

Here is sample based on the [http://www.boost.org/doc/libs/1_47_0/libs/fusion/doc/html/fusion/adapted/adapt_tpl_struct.html demo::employee] example that shows correct use of Fusion-adapted type:
 
{{{
#include <iostream>
#include <string>
#include <boost/fusion/adapted/struct/adapt_struct.hpp>
#include <boost/fusion/include/adapt_struct.hpp>
#include <boost/fusion/sequence/io.hpp>
#include <boost/fusion/include/io.hpp>

namespace demo
{
    // This does the trick, but not documented
    using boost::fusion::operators::operator<<;
    using boost::fusion::operators::operator>>;


    template<typename Name, typename Age>
    struct employee
    {
        Name name;
        Age age;
    };
}

// Any instantiated demo::employee is now a Fusion sequence
BOOST_FUSION_ADAPT_TPL_STRUCT(
    (Name)(Age),
    (demo::employee) (Name)(Age),
    (Name, name)
    (Age, age))

int main()
{
    demo::employee<std::string, int> e;
    std::cin >> e;
    std::cout << e << std::endl;
}
}}}

",Bugs,closed,Boost 1.68.0,fusion,Boost 1.47.0,Problem,fixed,,