Splitting up the registration

It is possible to split up a module registration into several translation units without making each registration dependent on the module it’s being registered in.

a.cpp:

luabind::scope register_a()
{
    return
        class_<a>("a")
            .def("f", &a::f)
            ;
}

b.cpp:

luabind::scope register_b()
{
    return
        class_<b>("b")
            .def("g", &b::g)
            ;
}

module_ab.cpp:

luabind::scope register_a();
luabind::scope register_b();

void register_module(lua_State* L)
{
    module("b", L)
    [
        register_a(),
        register_b()
    ];
}