Added an unpacking msgpack::object on an existing zone example.

example/cpp03/reuse_zone.cpp

@@ -0,0 +1,47 @@
+// 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 <iostream>
+#include <sstream>
+#include <cassert>
+
+#include <string>
+#include <vector>
+
+#include <msgpack.hpp>
+
+
+int main() {
+    std::vector<int> v;
+    v.push_back(1);
+    v.push_back(42);
+    std::string s("ABC");
+
+    std::stringstream ss;
+    msgpack::pack(ss, v);
+    msgpack::pack(ss, s);
+
+    msgpack::zone z;
+    std::size_t offset = 0;
+
+    // msgpack array is constructed on z.
+    msgpack::object obj = msgpack::unpack(z, ss.str().data(), ss.str().size(), offset);
+    assert(obj.as<std::vector<int> >() == v);
+
+    // msgpack str is constructed on z.
+    assert(msgpack::unpack(z, ss.str().data(), ss.str().size(), offset).as<std::string>() == s);
+}