diff --git a/CMakeLists.txt b/CMakeLists.txt
index f984283b..af1aefe8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -84,6 +84,7 @@ LIST (APPEND msgpack_HEADERS
 IF (MSGPACK_ENABLE_CXX)
     LIST (APPEND msgpack_HEADERS
         include/msgpack.hpp
+        include/msgpack_forward.hpp
         include/msgpack/adaptor/bool.hpp
         include/msgpack/adaptor/char_ptr.hpp
         include/msgpack/adaptor/cpp11/array.hpp
@@ -115,6 +116,7 @@ IF (MSGPACK_ENABLE_CXX)
         include/msgpack/detail/cpp11_zone.hpp
         include/msgpack/fbuffer.hpp
         include/msgpack/object.hpp
+        include/msgpack/object_forward.hpp
         include/msgpack/pack.hpp
         include/msgpack/sbuffer.hpp
         include/msgpack/type.hpp
diff --git a/erb/cpp03_define.hpp.erb b/erb/cpp03_define.hpp.erb
index 2e4a9db6..e4350202 100644
--- a/erb/cpp03_define.hpp.erb
+++ b/erb/cpp03_define.hpp.erb
@@ -19,6 +19,7 @@
 #define MSGPACK_CPP03_DEFINE_HPP
 
 #include "msgpack/versioning.hpp"
+#include "msgpack_forward.hpp"
 
 #define MSGPACK_DEFINE(...) \
     template <typename Packer> \
diff --git a/erb/cpp03_msgpack_tuple.hpp.erb b/erb/cpp03_msgpack_tuple.hpp.erb
index c3e5006b..582762d2 100644
--- a/erb/cpp03_msgpack_tuple.hpp.erb
+++ b/erb/cpp03_msgpack_tuple.hpp.erb
@@ -19,7 +19,7 @@
 #define MSGPACK_CPP03_MSGPACK_TUPLE_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 
 namespace msgpack {
 
diff --git a/erb/cpp03_zone.hpp.erb b/erb/cpp03_zone.hpp.erb
index 25d69091..69261065 100644
--- a/erb/cpp03_zone.hpp.erb
+++ b/erb/cpp03_zone.hpp.erb
@@ -23,7 +23,7 @@
 #include <vector>
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/cpp_config.hpp"
+#include "msgpack_forward.hpp"
 
 #ifndef MSGPACK_ZONE_CHUNK_SIZE
 #define MSGPACK_ZONE_CHUNK_SIZE 8192
diff --git a/include/msgpack/adaptor/bool.hpp b/include/msgpack/adaptor/bool.hpp
index e2b50a7a..1d794dd1 100644
--- a/include/msgpack/adaptor/bool.hpp
+++ b/include/msgpack/adaptor/bool.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_BOOL_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 #include <vector>
 
 namespace msgpack {
diff --git a/include/msgpack/adaptor/char_ptr.hpp b/include/msgpack/adaptor/char_ptr.hpp
index 5566040a..cf013b34 100644
--- a/include/msgpack/adaptor/char_ptr.hpp
+++ b/include/msgpack/adaptor/char_ptr.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_CHAR_PTR_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 #include <cstring>
 
 namespace msgpack {
diff --git a/include/msgpack/adaptor/cpp11/array.hpp b/include/msgpack/adaptor/cpp11/array.hpp
index 5f7ac1b7..e9e1c972 100644
--- a/include/msgpack/adaptor/cpp11/array.hpp
+++ b/include/msgpack/adaptor/cpp11/array.hpp
@@ -20,12 +20,10 @@
 #define MSGPACK_CPP11_ARRAY_HPP
 
 #include "msgpack/versioning.hpp"
+#include "msgpack_forward.hpp"
 
 #include <array>
 
-#include "msgpack/object.hpp"
-#include "msgpack/cpp_config.hpp"
-
 namespace msgpack {
 
 MSGPACK_API_VERSION_NAMESPACE(v1) {
diff --git a/include/msgpack/adaptor/cpp11/array_char.hpp b/include/msgpack/adaptor/cpp11/array_char.hpp
index 17a8605e..34aa2761 100644
--- a/include/msgpack/adaptor/cpp11/array_char.hpp
+++ b/include/msgpack/adaptor/cpp11/array_char.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_ARRAY_CHAR_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 #include <array>
 
 namespace msgpack {
diff --git a/include/msgpack/adaptor/cpp11/forward_list.hpp b/include/msgpack/adaptor/cpp11/forward_list.hpp
index f1a442e2..d2dbebb9 100644
--- a/include/msgpack/adaptor/cpp11/forward_list.hpp
+++ b/include/msgpack/adaptor/cpp11/forward_list.hpp
@@ -20,12 +20,10 @@
 #define MSGPACK_CPP11_FORWARD_LIST_HPP
 
 #include "msgpack/versioning.hpp"
+#include "msgpack_forward.hpp"
 
 #include <forward_list>
 
-#include "msgpack/object.hpp"
-#include "msgpack/cpp_config.hpp"
-
 namespace msgpack {
 
 MSGPACK_API_VERSION_NAMESPACE(v1) {
diff --git a/include/msgpack/adaptor/cpp11/tuple.hpp b/include/msgpack/adaptor/cpp11/tuple.hpp
index 935c9fbf..704d81ab 100644
--- a/include/msgpack/adaptor/cpp11/tuple.hpp
+++ b/include/msgpack/adaptor/cpp11/tuple.hpp
@@ -19,12 +19,10 @@
 #define MSGPACK_CPP11_TUPLE_HPP
 
 #include "msgpack/versioning.hpp"
+#include "msgpack_forward.hpp"
 
 #include <tuple>
 
-#include "msgpack/object.hpp"
-#include "msgpack/cpp_config.hpp"
-
 namespace msgpack {
 
 MSGPACK_API_VERSION_NAMESPACE(v1) {
diff --git a/include/msgpack/adaptor/deque.hpp b/include/msgpack/adaptor/deque.hpp
index 11aad789..364baff3 100644
--- a/include/msgpack/adaptor/deque.hpp
+++ b/include/msgpack/adaptor/deque.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_DEQUE_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 #include <deque>
 
 namespace msgpack {
diff --git a/include/msgpack/adaptor/detail/cpp03_define.hpp b/include/msgpack/adaptor/detail/cpp03_define.hpp
index 5463b3a7..d9090236 100644
--- a/include/msgpack/adaptor/detail/cpp03_define.hpp
+++ b/include/msgpack/adaptor/detail/cpp03_define.hpp
@@ -19,6 +19,7 @@
 #define MSGPACK_CPP03_DEFINE_HPP
 
 #include "msgpack/versioning.hpp"
+#include "msgpack_forward.hpp"
 
 #define MSGPACK_DEFINE(...) \
     template <typename Packer> \
diff --git a/include/msgpack/adaptor/detail/cpp03_msgpack_tuple.hpp b/include/msgpack/adaptor/detail/cpp03_msgpack_tuple.hpp
index ac8c7807..3ffd0e29 100644
--- a/include/msgpack/adaptor/detail/cpp03_msgpack_tuple.hpp
+++ b/include/msgpack/adaptor/detail/cpp03_msgpack_tuple.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_CPP03_MSGPACK_TUPLE_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 
 namespace msgpack {
 
diff --git a/include/msgpack/adaptor/detail/cpp11_define.hpp b/include/msgpack/adaptor/detail/cpp11_define.hpp
index 8ec9b469..b8a0979f 100644
--- a/include/msgpack/adaptor/detail/cpp11_define.hpp
+++ b/include/msgpack/adaptor/detail/cpp11_define.hpp
@@ -19,6 +19,7 @@
 #define MSGPACK_CPP11_DEFINE_HPP
 
 #include "msgpack/versioning.hpp"
+#include "msgpack_forward.hpp"
 
 #include <type_traits>
 
diff --git a/include/msgpack/adaptor/detail/cpp11_msgpack_tuple.hpp b/include/msgpack/adaptor/detail/cpp11_msgpack_tuple.hpp
index 84d4ae0b..4f190a86 100644
--- a/include/msgpack/adaptor/detail/cpp11_msgpack_tuple.hpp
+++ b/include/msgpack/adaptor/detail/cpp11_msgpack_tuple.hpp
@@ -19,12 +19,10 @@
 #define MSGPACK_CPP11_MSGPACK_TUPLE_HPP
 
 #include "msgpack/versioning.hpp"
+#include "msgpack_forward.hpp"
 
 #include <tuple>
 
-#include "msgpack/object.hpp"
-#include "msgpack/cpp_config.hpp"
-
 namespace msgpack {
 
 MSGPACK_API_VERSION_NAMESPACE(v1) {
diff --git a/include/msgpack/adaptor/fixint.hpp b/include/msgpack/adaptor/fixint.hpp
index e1bc9306..ca5e6b02 100644
--- a/include/msgpack/adaptor/fixint.hpp
+++ b/include/msgpack/adaptor/fixint.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_FIXINT_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 #include "msgpack/adaptor/int.hpp"
 
 namespace msgpack {
diff --git a/include/msgpack/adaptor/float.hpp b/include/msgpack/adaptor/float.hpp
index 3a5404b9..bbace593 100644
--- a/include/msgpack/adaptor/float.hpp
+++ b/include/msgpack/adaptor/float.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_FLOAT_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 #include <vector>
 
 namespace msgpack {
diff --git a/include/msgpack/adaptor/int.hpp b/include/msgpack/adaptor/int.hpp
index 92135cd4..6491d274 100644
--- a/include/msgpack/adaptor/int.hpp
+++ b/include/msgpack/adaptor/int.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_INT_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 #include <limits>
 
 namespace msgpack {
diff --git a/include/msgpack/adaptor/list.hpp b/include/msgpack/adaptor/list.hpp
index 5d0169d6..b7690dd7 100644
--- a/include/msgpack/adaptor/list.hpp
+++ b/include/msgpack/adaptor/list.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_LIST_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 #include <list>
 
 namespace msgpack {
diff --git a/include/msgpack/adaptor/map.hpp b/include/msgpack/adaptor/map.hpp
index be5add20..de9f825e 100644
--- a/include/msgpack/adaptor/map.hpp
+++ b/include/msgpack/adaptor/map.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_MAP_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 #include <map>
 #include <vector>
 #include <algorithm>
diff --git a/include/msgpack/adaptor/nil.hpp b/include/msgpack/adaptor/nil.hpp
index af7f6308..c8f2a0c7 100644
--- a/include/msgpack/adaptor/nil.hpp
+++ b/include/msgpack/adaptor/nil.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_NIL_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 
 namespace msgpack {
 
diff --git a/include/msgpack/adaptor/pair.hpp b/include/msgpack/adaptor/pair.hpp
index 10784af0..238abb8e 100644
--- a/include/msgpack/adaptor/pair.hpp
+++ b/include/msgpack/adaptor/pair.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_PAIR_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 #include <utility>
 
 namespace msgpack {
diff --git a/include/msgpack/adaptor/raw.hpp b/include/msgpack/adaptor/raw.hpp
index c61e8cb5..52790519 100644
--- a/include/msgpack/adaptor/raw.hpp
+++ b/include/msgpack/adaptor/raw.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_RAW_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 #include <string.h>
 #include <string>
 
diff --git a/include/msgpack/adaptor/set.hpp b/include/msgpack/adaptor/set.hpp
index a714b4db..a01b1618 100644
--- a/include/msgpack/adaptor/set.hpp
+++ b/include/msgpack/adaptor/set.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_SET_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 
 #include <set>
 
diff --git a/include/msgpack/adaptor/string.hpp b/include/msgpack/adaptor/string.hpp
index f3fdd302..66068361 100644
--- a/include/msgpack/adaptor/string.hpp
+++ b/include/msgpack/adaptor/string.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_STRING_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 #include <string>
 
 namespace msgpack {
diff --git a/include/msgpack/adaptor/tr1/unordered_map.hpp b/include/msgpack/adaptor/tr1/unordered_map.hpp
index 228cc584..77399581 100644
--- a/include/msgpack/adaptor/tr1/unordered_map.hpp
+++ b/include/msgpack/adaptor/tr1/unordered_map.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_TR1_UNORDERED_MAP_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 
 #if defined(_LIBCPP_VERSION) || (_MSC_VER >= 1700)
 
diff --git a/include/msgpack/adaptor/tr1/unordered_set.hpp b/include/msgpack/adaptor/tr1/unordered_set.hpp
index 045bd0a9..e81fe590 100644
--- a/include/msgpack/adaptor/tr1/unordered_set.hpp
+++ b/include/msgpack/adaptor/tr1/unordered_set.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_TR1_UNORDERED_SET_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 
 #if defined(_LIBCPP_VERSION) || (_MSC_VER >= 1700)
 
diff --git a/include/msgpack/adaptor/vector.hpp b/include/msgpack/adaptor/vector.hpp
index 406b32f0..21f2f085 100644
--- a/include/msgpack/adaptor/vector.hpp
+++ b/include/msgpack/adaptor/vector.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_VECTOR_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 #include <vector>
 
 namespace msgpack {
diff --git a/include/msgpack/adaptor/vector_char.hpp b/include/msgpack/adaptor/vector_char.hpp
index 8675370b..a702f445 100644
--- a/include/msgpack/adaptor/vector_char.hpp
+++ b/include/msgpack/adaptor/vector_char.hpp
@@ -19,7 +19,7 @@
 #define MSGPACK_TYPE_VECTOR_CHAR_HPP
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/object.hpp"
+#include "msgpack_forward.hpp"
 #include <vector>
 
 namespace msgpack {
diff --git a/include/msgpack/detail/cpp03_zone.hpp b/include/msgpack/detail/cpp03_zone.hpp
index cc09b6a8..b2acd3d8 100644
--- a/include/msgpack/detail/cpp03_zone.hpp
+++ b/include/msgpack/detail/cpp03_zone.hpp
@@ -23,7 +23,7 @@
 #include <vector>
 
 #include "msgpack/versioning.hpp"
-#include "msgpack/cpp_config.hpp"
+#include "msgpack_forward.hpp"
 
 #ifndef MSGPACK_ZONE_CHUNK_SIZE
 #define MSGPACK_ZONE_CHUNK_SIZE 8192
diff --git a/include/msgpack/object.hpp b/include/msgpack/object.hpp
index f96543e2..7e22426c 100644
--- a/include/msgpack/object.hpp
+++ b/include/msgpack/object.hpp
@@ -1,7 +1,7 @@
 //
 // MessagePack for C++ static resolution routine
 //
-// Copyright (C) 2008-2010 FURUHASHI Sadayuki
+// Copyright (C) 2008-2014 FURUHASHI Sadayuki and KONDO Takatoshi
 //
 //    Licensed under the Apache License, Version 2.0 (the "License");
 //    you may not use this file except in compliance with the License.
@@ -19,9 +19,9 @@
 #define MSGPACK_OBJECT_HPP
 
 #include "msgpack/versioning.hpp"
-#include "object.h"
-#include "pack.hpp"
-#include "zone.hpp"
+#include "msgpack/object_forward.hpp"
+#include "msgpack/pack.hpp"
+#include "msgpack/zone.hpp"
 #include <string.h>
 #include <stdexcept>
 #include <typeinfo>
@@ -32,114 +32,6 @@ namespace msgpack {
 
 MSGPACK_API_VERSION_NAMESPACE(v1) {
 
-class type_error : public std::bad_cast { };
-
-
-namespace type {
-    enum object_type {
-        NIL                 = MSGPACK_OBJECT_NIL,
-        BOOLEAN             = MSGPACK_OBJECT_BOOLEAN,
-        POSITIVE_INTEGER    = MSGPACK_OBJECT_POSITIVE_INTEGER,
-        NEGATIVE_INTEGER    = MSGPACK_OBJECT_NEGATIVE_INTEGER,
-        DOUBLE              = MSGPACK_OBJECT_DOUBLE,
-        STR                 = MSGPACK_OBJECT_STR,
-        BIN                 = MSGPACK_OBJECT_BIN,
-        ARRAY               = MSGPACK_OBJECT_ARRAY,
-        MAP                 = MSGPACK_OBJECT_MAP,
-        EXT                 = MSGPACK_OBJECT_EXT
-    };
-}
-
-
-struct object;
-struct object_kv;
-
-struct object_array {
-    uint32_t size;
-    object* ptr;
-};
-
-struct object_map {
-    uint32_t size;
-    object_kv* ptr;
-};
-
-struct object_str {
-    uint32_t size;
-    const char* ptr;
-};
-
-struct object_bin {
-    uint32_t size;
-    const char* ptr;
-};
-
-struct object_ext {
-    int8_t type() const { return ptr[0]; }
-    const char* data() const { return &ptr[1]; }
-    uint32_t size;
-    const char* ptr;
-};
-
-struct object {
-    union union_type {
-        bool boolean;
-        uint64_t u64;
-        int64_t  i64;
-        double   dec;
-        object_array array;
-        object_map map;
-        object_str str;
-        object_bin bin;
-        object_ext ext;
-    };
-
-    type::object_type type;
-    union_type via;
-
-    bool is_nil() const { return type == type::NIL; }
-
-    template <typename T>
-    T as() const;
-
-    template <typename T>
-    void convert(T& v) const;
-    template <typename T>
-    void convert(T* v) const;
-
-    object();
-
-    object(msgpack_object o);
-
-    template <typename T>
-    explicit object(const T& v);
-
-    template <typename T>
-    object(const T& v, zone& z);
-
-    // obsolete
-    template <typename T>
-    object(const T& v, zone* z);
-
-    template <typename T>
-    object& operator=(const T& v);
-
-    operator msgpack_object() const;
-
-    struct with_zone;
-
-private:
-    struct implicit_type;
-
-public:
-    implicit_type convert() const;
-};
-
-struct object_kv {
-    object key;
-    object val;
-};
-
 struct object::with_zone : object {
     with_zone(msgpack::zone& zone) : zone(zone) { }
     msgpack::zone& zone;
diff --git a/include/msgpack/object_forward.hpp b/include/msgpack/object_forward.hpp
new file mode 100644
index 00000000..cad24f45
--- /dev/null
+++ b/include/msgpack/object_forward.hpp
@@ -0,0 +1,144 @@
+//
+// MessagePack for C++ static resolution routine
+//
+// Copyright (C) 2008-2014 FURUHASHI Sadayuki and 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.
+//
+
+#ifndef MSGPACK_OBJECT_FORWARD_HPP
+#define MSGPACK_OBJECT_FORWARD_HPP
+
+#include "msgpack/versioning.hpp"
+#include "msgpack/zone.hpp"
+#include "msgpack/object.h"
+
+#include <typeinfo>
+
+namespace msgpack {
+
+MSGPACK_API_VERSION_NAMESPACE(v1) {
+
+
+namespace type {
+    enum object_type {
+        NIL                 = MSGPACK_OBJECT_NIL,
+        BOOLEAN             = MSGPACK_OBJECT_BOOLEAN,
+        POSITIVE_INTEGER    = MSGPACK_OBJECT_POSITIVE_INTEGER,
+        NEGATIVE_INTEGER    = MSGPACK_OBJECT_NEGATIVE_INTEGER,
+        DOUBLE              = MSGPACK_OBJECT_DOUBLE,
+        STR                 = MSGPACK_OBJECT_STR,
+        BIN                 = MSGPACK_OBJECT_BIN,
+        ARRAY               = MSGPACK_OBJECT_ARRAY,
+        MAP                 = MSGPACK_OBJECT_MAP,
+        EXT                 = MSGPACK_OBJECT_EXT
+    };
+}
+
+
+struct object;
+struct object_kv;
+
+struct object_array {
+    uint32_t size;
+    object* ptr;
+};
+
+struct object_map {
+    uint32_t size;
+    object_kv* ptr;
+};
+
+struct object_str {
+    uint32_t size;
+    const char* ptr;
+};
+
+struct object_bin {
+    uint32_t size;
+    const char* ptr;
+};
+
+struct object_ext {
+    int8_t type() const { return ptr[0]; }
+    const char* data() const { return &ptr[1]; }
+    uint32_t size;
+    const char* ptr;
+};
+
+struct object {
+    union union_type {
+        bool boolean;
+        uint64_t u64;
+        int64_t  i64;
+        double   dec;
+        object_array array;
+        object_map map;
+        object_str str;
+        object_bin bin;
+        object_ext ext;
+    };
+
+    type::object_type type;
+    union_type via;
+
+    bool is_nil() const { return type == type::NIL; }
+
+    template <typename T>
+    T as() const;
+
+    template <typename T>
+    void convert(T& v) const;
+    template <typename T>
+    void convert(T* v) const;
+
+    object();
+
+    object(msgpack_object o);
+
+    template <typename T>
+    explicit object(const T& v);
+
+    template <typename T>
+    object(const T& v, zone& z);
+
+    // obsolete
+    template <typename T>
+    object(const T& v, zone* z);
+
+    template <typename T>
+    object& operator=(const T& v);
+
+    operator msgpack_object() const;
+
+    struct with_zone;
+
+private:
+    struct implicit_type;
+
+public:
+    implicit_type convert() const;
+};
+
+class type_error : public std::bad_cast { };
+
+struct object_kv {
+    object key;
+    object val;
+};
+
+} // MSGPACK_API_VERSION_NAMESPACE(v1)
+
+} // namespace msgpack
+
+#endif // MSGPACK_OBJECT_FORWARD_HPP
diff --git a/include/msgpack_forward.hpp b/include/msgpack_forward.hpp
new file mode 100644
index 00000000..90963fe6
--- /dev/null
+++ b/include/msgpack_forward.hpp
@@ -0,0 +1,26 @@
+/*
+ * MessagePack for C++ version switcher
+ *
+ * Copyright (C) 2014 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.
+ */
+#ifndef MSGPACK_FORWARD_HPP
+#define MSGPACK_FORWARD_HPP
+
+#include "msgpack/versioning.hpp"
+#include "msgpack/zone.hpp"
+#include "msgpack/object_forward.hpp"
+#include "msgpack/pack.hpp"
+
+#endif // MSGPACK_FORWARD_HPP
diff --git a/src/Makefile.am b/src/Makefile.am
index b3245236..df0a872c 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -53,6 +53,7 @@ nobase_include_HEADERS = \
 if ENABLE_CXX
 nobase_include_HEADERS += \
 		../include/msgpack.hpp \
+		../include/msgpack_forward.hpp \
 		../include/msgpack/adaptor/bool.hpp \
 		../include/msgpack/adaptor/char_ptr.hpp \
 		../include/msgpack/adaptor/cpp11/array.hpp \
@@ -84,6 +85,7 @@ nobase_include_HEADERS += \
 		../include/msgpack/detail/cpp11_zone.hpp \
 		../include/msgpack/fbuffer.hpp \
 		../include/msgpack/object.hpp \
+		../include/msgpack/object_forward.hpp \
 		../include/msgpack/pack.hpp \
 		../include/msgpack/sbuffer.hpp \
 		../include/msgpack/type.hpp \