diff --git a/example/speed_test.cc b/example/speed_test.cc
index 267c042b..589fbe40 100644
--- a/example/speed_test.cc
+++ b/example/speed_test.cc
@@ -36,6 +36,16 @@ void test_map_pack_unpack() {
 		std::cout << result << std::endl;
 	}
 	std::cout << "Unpack finished..." << std::endl;
+
+	msgpack::unpacked unpacked;
+	std::cout << "Start unpacking...by void unpack(unpacked* result, const char* data, size_t len, size_t* offset = NULL)" << std::endl;
+	{
+		boost::timer::cpu_timer timer;
+		msgpack::unpack(unpacked, str.data(), str.size());
+		std::string result = timer.format();
+		std::cout << result << std::endl;
+	}
+	std::cout << "Unpack finished..." << std::endl;
 }
 
 
diff --git a/src/msgpack/unpack.hpp b/src/msgpack/unpack.hpp
index 6b538760..694b75c4 100644
--- a/src/msgpack/unpack.hpp
+++ b/src/msgpack/unpack.hpp
@@ -542,8 +542,8 @@ public:
 	unpacked(object const& obj, msgpack::unique_ptr<msgpack::zone> z) :
 		m_obj(obj), m_zone(msgpack::move(z)) { }
 
-	object& get()
-		{ return m_obj; }
+	void set(object const& obj)
+		{ m_obj = obj; }
 
 	const object& get() const
 		{ return m_obj; }
@@ -670,7 +670,7 @@ private:
 };
 
 
-static void unpack(unpacked* result,
+static void unpack(unpacked& result,
 		const char* data, size_t len, size_t* offset = NULL);
 
 
@@ -824,12 +824,12 @@ inline bool unpacker::next(unpacked* result)
 
 	if(ret == 0) {
 		result->zone().reset();
-		result->get() = object();
+		result->set(object());
 		return false;
 
 	} else {
 		result->zone().reset( release_zone() );
-		result->get() = data();
+		result->set(data());
 		reset();
 		return true;
 	}
@@ -981,7 +981,7 @@ unpack_imp(const char* data, size_t len, size_t* off,
 
 } // detail
 
-inline void unpack(unpacked* result,
+inline void unpack(unpacked& result,
 		const char* data, size_t len, size_t* offset)
 {
 	object obj;
@@ -993,13 +993,13 @@ inline void unpack(unpacked* result,
 
 	switch(ret) {
 	case UNPACK_SUCCESS:
-		result->get() = obj;
-		result->zone() = msgpack::move(z);
+		result.set(obj);
+		result.zone() = msgpack::move(z);
 		return;
 
 	case UNPACK_EXTRA_BYTES:
-		result->get() = obj;
-		result->zone() = msgpack::move(z);
+		result.set(obj);
+		result.zone() = msgpack::move(z);
 		return;
 
 	case UNPACK_CONTINUE:
diff --git a/test/fixint.cc b/test/fixint.cc
index 63288a1b..a45edb90 100644
--- a/test/fixint.cc
+++ b/test/fixint.cc
@@ -30,7 +30,7 @@ void check_convert() {
 	msgpack::pack(sbuf, v1);
 
 	msgpack::unpacked msg;
-	msgpack::unpack(&msg, sbuf.data(), sbuf.size());
+	msgpack::unpack(msg, sbuf.data(), sbuf.size());
 
 	T v2;
 	msg.get().convert(&v2);
diff --git a/test/pack_unpack.cc b/test/pack_unpack.cc
index 6718a01b..fd42bc4d 100644
--- a/test/pack_unpack.cc
+++ b/test/pack_unpack.cc
@@ -81,13 +81,13 @@ TEST(unpack, sequence)
 
 	msgpack::unpacked msg;
 
-	msgpack::unpack(&msg, sbuf.data(), sbuf.size(), &offset);
+	msgpack::unpack(msg, sbuf.data(), sbuf.size(), &offset);
 	EXPECT_EQ(1, msg.get().as<int>());
 
-	msgpack::unpack(&msg, sbuf.data(), sbuf.size(), &offset);
+	msgpack::unpack(msg, sbuf.data(), sbuf.size(), &offset);
 	EXPECT_EQ(2, msg.get().as<int>());
 
-	msgpack::unpack(&msg, sbuf.data(), sbuf.size(), &offset);
+	msgpack::unpack(msg, sbuf.data(), sbuf.size(), &offset);
 	EXPECT_EQ(3, msg.get().as<int>());
 }