enum support had been incomplete.
This fix made enum support complete.
Replaced int with auto on c++11 scoped enum.
Replaced template specializations with function overloads on operator<< and operator>> for enum.
enum can convert to object with and without zone.
When you want to adapt enum, you need to write as follows:
// NOT msgpack.hpp
enum yourenum {
elem
};
MSGPACK_ADD_ENUM(yourenum);
// msgpack.hpp should be included after MSGPACK_ADD_ENUM(...)
int main() {
msgpack::object obj(yourenum::elem);
}