Fixed #644.

Added `as()` checking to MSGPACK_DEFINE family.

Files.cmake

@@ -541,6 +541,7 @@ IF (MSGPACK_ENABLE_CXX)
         include/msgpack/v1/adaptor/detail/cpp03_define_map_decl.hpp
         include/msgpack/v1/adaptor/detail/cpp03_msgpack_tuple.hpp
         include/msgpack/v1/adaptor/detail/cpp03_msgpack_tuple_decl.hpp
+        include/msgpack/v1/adaptor/detail/cpp11_convert_helper.hpp
         include/msgpack/v1/adaptor/detail/cpp11_define_array.hpp
         include/msgpack/v1/adaptor/detail/cpp11_define_array_decl.hpp
         include/msgpack/v1/adaptor/detail/cpp11_define_map.hpp

include/msgpack/v1/adaptor/detail/cpp11_convert_helper.hpp

@@ -0,0 +1,45 @@
+//
+// MessagePack for C++ static resolution routine
+//
+// Copyright (C) 2017 KONDO Takatoshi
+//
+//    Distributed under the Boost Software License, Version 1.0.
+//    (See accompanying file LICENSE_1_0.txt or copy at
+//    http://www.boost.org/LICENSE_1_0.txt)
+//
+#ifndef MSGPACK_V1_CPP11_CONVERT_HELPER_HPP
+#define MSGPACK_V1_CPP11_CONVERT_HELPER_HPP
+
+#include <tuple>
+
+#include <msgpack/object_fwd.hpp>
+
+namespace msgpack {
+/// @cond
+MSGPACK_API_VERSION_NAMESPACE(v1) {
+/// @endcond
+namespace type {
+
+template <typename T>
+inline typename std::enable_if<
+    has_as<T>::value
+>::type
+convert_helper(msgpack::object const& o, T& t) {
+    t = o.as<T>();
+}
+template <typename T>
+inline typename std::enable_if<
+    !has_as<T>::value
+>::type
+convert_helper(msgpack::object const& o, T& t) {
+    o.convert(t);
+}
+
+}  // namespace type
+
+/// @cond
+}  // MSGPACK_API_VERSION_NAMESPACE(v1)
+/// @endcond
+}  // namespace msgpack
+
+#endif // MSGPACK_V1_CPP11_CONVERT_HELPER_HPP

include/msgpack/v1/adaptor/detail/cpp11_define_array.hpp

@@ -11,6 +11,7 @@
 #define MSGPACK_V1_CPP11_DEFINE_ARRAY_HPP
 
 #include "msgpack/v1/adaptor/detail/cpp11_define_array_decl.hpp"
+#include "msgpack/v1/adaptor/detail/cpp11_convert_helper.hpp"
 
 #include <tuple>
 
@@ -20,6 +21,39 @@ MSGPACK_API_VERSION_NAMESPACE(v1) {
 /// @endcond
 namespace type {
 
+namespace detail {
+template <int N, typename... Ts>
+struct get;
+
+template <int N, typename T, typename... Ts>
+struct get<N, std::tuple<T, Ts...>>
+{
+    using type = typename get<N - 1, std::tuple<Ts...>>::type;
+};
+
+template <typename T, typename... Ts>
+struct get<0, std::tuple<T, Ts...>>
+{
+    using type = T;
+};
+
+template <typename T>
+inline typename std::enable_if<
+    has_as<T>::value
+>::type
+unpack_impl(msgpack::object const& o, T& t) {
+    t = o.as<T>();
+}
+template <typename T>
+inline typename std::enable_if<
+    !has_as<T>::value
+>::type
+unpack_impl(msgpack::object const& o, T& t) {
+    o.convert(t);
+}
+
+} // namespace detail
+
 template <typename Tuple, std::size_t N>
 struct define_array_imp {
     template <typename Packer>
@@ -31,7 +65,7 @@ struct define_array_imp {
         define_array_imp<Tuple, N-1>::unpack(o, t);
         const size_t size = o.via.array.size;
         if(size <= N-1) { return; }
-        o.via.array.ptr[N-1].convert(std::get<N-1>(t));
+        convert_helper(o.via.array.ptr[N-1], std::get<N-1>(t));
     }
     static void object(msgpack::object* o, msgpack::zone& z, Tuple const& t) {
         define_array_imp<Tuple, N-1>::object(o, z, t);
@@ -48,7 +82,7 @@ struct define_array_imp<Tuple, 1> {
     static void unpack(msgpack::object const& o, Tuple& t) {
         const size_t size = o.via.array.size;
         if(size <= 0) { return; }
-        o.via.array.ptr[0].convert(std::get<0>(t));
+        convert_helper(o.via.array.ptr[0], std::get<0>(t));
     }
     static void object(msgpack::object* o, msgpack::zone& z, Tuple const& t) {
         o->via.array.ptr[0] = msgpack::object(std::get<0>(t), z);

include/msgpack/v1/adaptor/detail/cpp11_define_map.hpp

@@ -11,6 +11,7 @@
 #define MSGPACK_V1_CPP11_DEFINE_MAP_HPP
 
 #include "msgpack/v1/adaptor/detail/cpp11_define_map_decl.hpp"
+#include "msgpack/v1/adaptor/detail/cpp11_convert_helper.hpp"
 
 #include <tuple>
 #include <map>
@@ -34,7 +35,7 @@ struct define_map_imp {
         define_map_imp<Tuple, N-2>::unpack(o, t, kvmap);
         auto it = kvmap.find(std::get<N-2>(t));
         if (it != kvmap.end()) {
-            it->second->convert(std::get<N-1>(t));
+            convert_helper(*it->second, std::get<N-1>(t));
         }
     }
     static void object(msgpack::object* o, msgpack::zone& z, Tuple const& t) {