tostring() operator outside class?

Consider this:
 
,luabind::class_<Test>("Test")
.def(luabind::tostring(luabind::const_self))
 
ostream& operator << (ostream &os, const Test &test)
{
    os << test.value;
    return os;
}
 
Is it possible to NOT have this friend operator of class Test and map it in another way? Something like this:
 
,luabind::class_<Test>("Test")
.def(luabind::tostring(test_tostring_operator))
 
void test_tostring_operator() { blah }
 
 
Thanks

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