Added enum examples.

Added converting to zone with or without zone.

example/cpp03/enum.cpp

@@ -0,0 +1,68 @@
+// MessagePack for C++ example
+//
+// Copyright (C) 2015 KONDO Takatoshi
+//
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+//
+//        http://www.apache.org/licenses/LICENSE-2.0
+//
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+//
+
+#include <msgpack_fwd.hpp>
+#include <sstream>
+#include <iostream>
+#include <cassert>
+
+enum my_enum {
+    elem1,
+    elem2,
+    elem3
+};
+
+MSGPACK_ADD_ENUM(my_enum);
+
+#include <msgpack.hpp>
+
+int main(void)
+{
+    {   // pack, unpack
+        std::stringstream sbuf;
+        msgpack::pack(sbuf, elem1);
+        msgpack::pack(sbuf, elem2);
+        my_enum e3 = elem3;
+        msgpack::pack(sbuf, e3);
+
+        msgpack::unpacked result;
+        std::size_t off = 0;
+
+        msgpack::unpack(result, sbuf.str().data(), sbuf.str().size(), off);
+        std::cout << result.get().as<my_enum>() << std::endl;
+        assert(result.get().as<my_enum>() == elem1);
+
+        msgpack::unpack(result, sbuf.str().data(), sbuf.str().size(), off);
+        std::cout << result.get().as<my_enum>() << std::endl;
+        assert(result.get().as<my_enum>() == elem2);
+
+        msgpack::unpack(result, sbuf.str().data(), sbuf.str().size(), off);
+        std::cout << result.get().as<my_enum>() << std::endl;
+        assert(result.get().as<my_enum>() == elem3);
+    }
+    {   // create object without zone
+        msgpack::object obj(elem2);
+        std::cout << obj.as<my_enum>() << std::endl;
+        assert(obj.as<my_enum>() == elem2);
+    }
+    {   // create object with zone
+        msgpack::zone z;
+        msgpack::object objz(elem3, z);
+        std::cout << objz.as<my_enum>() << std::endl;
+        assert(objz.as<my_enum>() == elem3);
+    }
+}