#include <boost/fusion/include/define_struct.hpp>
#include <boost/fusion/include/equal_to.hpp>

#include <boost/static_assert.hpp>

#include <iostream>
#include <iomanip>

namespace fusion = boost::fusion;

BOOST_FUSION_DEFINE_STRUCT(
    (),
    foo,
    (std::string,                   a)
    (std::string,                   b)
    )

bool operator==( const foo& lhs, const foo& rhs )
{
    return lhs == rhs;
}

int main()
{
    foo h1, h2, h3;
    h1.a = "Foo";
    h2.a = "Foo";
    h3.a = "Bar";

    std::cout << "h1 == h2: " << std::boolalpha << ( h1 == h2 ) << std::endl;
    std::cout << "h1 == h3: " << std::boolalpha << ( h1 == h3 ) << std::endl;
}