Added an example of the non default constructible class.

Refined an intrusive example. It includes base class serialization. We can switch map based and array based serialization.

example/cpp11/non_def_con_class.cpp

@@ -0,0 +1,58 @@
+// 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 <cassert>
+#include <memory>
+
+#include <msgpack.hpp>
+
+struct my {
+    my() = delete;
+
+    // target class should be either copyable or movable (or both).
+    my(my const&) = delete;
+    my(my&&) = default;
+
+    my(int a):a(a) {}
+    int a;
+    MSGPACK_DEFINE(a);
+};
+
+namespace msgpack {
+MSGPACK_API_VERSION_NAMESPACE(MSGPACK_DEFAULT_API_NS) {
+namespace adaptor {
+
+template<>
+struct as<my> {
+    my operator()(msgpack::object const& o) const {
+        if (o.type != msgpack::type::ARRAY) throw msgpack::type_error();
+        if (o.via.array.size != 1) throw msgpack::type_error();
+        return my(o.via.array.ptr[0].as<int>());
+    }
+};
+
+} // namespace adaptor
+} // MSGPACK_API_VERSION_NAMESPACE(MSGPACK_DEFAULT_API_NS)
+} // namespace msgpack
+
+int main() {
+    my m1(42);
+    msgpack::zone z;
+    msgpack::object obj(m1, z);
+    auto m2 = obj.as<my>();
+    assert(m1.a == m2.a);
+}