diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2b704043..8c2fad3f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,6 +1,13 @@
 cmake_minimum_required(VERSION 3.1.0 FATAL_ERROR)
 PROJECT(sioclient)
 
+option(BUILD_SHARED_LIBS "Build the shared library" OFF)
+option(Boost_USE_STATIC_LIBS "Use Boost static version" ON)
+
+set(MAJOR 1)
+set(MINOR 6)
+set(PATCH 0)
+
 if(NOT CMAKE_BUILD_TYPE )
 MESSAGE(STATUS "not define build type, set to release" )
 set(CMAKE_BUILD_TYPE Release )
@@ -11,7 +18,6 @@ endif()
 
 set(BOOST_VER "1.55.0" CACHE STRING "boost version" )
 
-set(Boost_USE_STATIC_LIBS ON) 
 set(Boost_USE_MULTITHREADED ON) 
 set(Boost_USE_STATIC_RUNTIME OFF) 
 find_package(Boost ${BOOST_VER} REQUIRED COMPONENTS system date_time random) 
@@ -21,7 +27,7 @@ aux_source_directory(${CMAKE_CURRENT_LIST_DIR}/src/internal ALL_SRC)
 file(GLOB ALL_HEADERS ${CMAKE_CURRENT_LIST_DIR}/src/*.h )
 set(SIO_INCLUDEDIR ${CMAKE_CURRENT_LIST_DIR})
 
-add_library(sioclient STATIC ${ALL_SRC}) 
+add_library(sioclient ${ALL_SRC})
 target_include_directories(sioclient PRIVATE ${Boost_INCLUDE_DIRS} 
     ${CMAKE_CURRENT_LIST_DIR}/src 
     ${CMAKE_CURRENT_LIST_DIR}/lib/websocketpp 
@@ -31,11 +37,18 @@ target_include_directories(sioclient PRIVATE ${Boost_INCLUDE_DIRS}
 set_property(TARGET sioclient PROPERTY CXX_STANDARD 11)
 set_property(TARGET sioclient PROPERTY CXX_STANDARD_REQUIRED ON)
 target_link_libraries(sioclient PRIVATE ${Boost_LIBRARIES})
+if(BUILD_SHARED_LIBS)
+set_target_properties(sioclient
+	PROPERTIES
+		SOVERSION ${MAJOR}
+		VERSION ${MAJOR}.${MINOR}.${PATCH}
+	)
+endif()
 list(APPEND TARGET_LIBRARIES sioclient)
 
 find_package(OpenSSL)
 if(OPENSSL_FOUND)
-add_library(sioclient_tls STATIC ${ALL_SRC})
+add_library(sioclient_tls ${ALL_SRC})
 target_include_directories(sioclient_tls PRIVATE ${Boost_INCLUDE_DIRS} 
     ${CMAKE_CURRENT_LIST_DIR}/src 
     ${CMAKE_CURRENT_LIST_DIR}/lib/websocketpp 
@@ -47,6 +60,13 @@ set_property(TARGET sioclient_tls PROPERTY CXX_STANDARD 11)
 set_property(TARGET sioclient_tls PROPERTY CXX_STANDARD_REQUIRED ON)
 target_link_libraries(sioclient_tls PRIVATE ${Boost_LIBRARIES} ${OPENSSL_LIBRARIES} )
 target_compile_definitions(sioclient_tls PRIVATE -DSIO_TLS)
+if(BUILD_SHARED_LIBS)
+set_target_properties(sioclient_tls
+	PROPERTIES
+		SOVERSION ${MAJOR}
+		VERSION ${MAJOR}.${MINOR}.${PATCH}
+	)
+endif()
 list(APPEND TARGET_LIBRARIES sioclient_tls)
 
 endif()
diff --git a/examples/Console/main.cpp b/examples/Console/main.cpp
index 1dc4e685..846f46fa 100755
--- a/examples/Console/main.cpp
+++ b/examples/Console/main.cpp
@@ -71,7 +71,7 @@ socket::ptr current_socket;
 
 void bind_events(socket::ptr &socket)
 {
-	current_socket->on("new message", sio::socket::event_listener_aux([&](string const& name, message::ptr const& data, bool isAck,message::ptr &ack_resp)
+	current_socket->on("new message", sio::socket::event_listener_aux([&](string const& name, message::ptr const& data, bool isAck,message::list &ack_resp)
                        {
                            _lock.lock();
                            string user = data->get_map()["username"]->get_string();
@@ -80,7 +80,7 @@ void bind_events(socket::ptr &socket)
                            _lock.unlock();
                        }));
     
-    current_socket->on("user joined",sio::socket::event_listener_aux([&](string const& name, message::ptr const& data, bool isAck,message::ptr &ack_resp)
+    current_socket->on("user joined",sio::socket::event_listener_aux([&](string const& name, message::ptr const& data, bool isAck,message::list &ack_resp)
                        {
                            _lock.lock();
                            string user = data->get_map()["username"]->get_string();
@@ -91,7 +91,7 @@ void bind_events(socket::ptr &socket)
                            HIGHLIGHT(user<<" joined"<<"\nthere"<<(plural?" are ":"'s ")<< participants<<(plural?" participants":" participant"));
                            _lock.unlock();
                        }));
-    current_socket->on("user left", sio::socket::event_listener_aux([&](string const& name, message::ptr const& data, bool isAck,message::ptr &ack_resp)
+    current_socket->on("user left", sio::socket::event_listener_aux([&](string const& name, message::ptr const& data, bool isAck,message::list &ack_resp)
                        {
                            _lock.lock();
                            string user = data->get_map()["username"]->get_string();
@@ -126,7 +126,7 @@ MAIN_FUNC
         
         getline(cin, nickname);
     }
-	current_socket->on("login", sio::socket::event_listener_aux([&](string const& name, message::ptr const& data, bool isAck,message::ptr &ack_resp){
+	current_socket->on("login", sio::socket::event_listener_aux([&](string const& name, message::ptr const& data, bool isAck,message::list &ack_resp){
         _lock.lock();
         participants = data->get_map()["numUsers"]->get_int();
         bool plural = participants !=1;
diff --git a/examples/QT/SioChatDemo/mainwindow.cpp b/examples/QT/SioChatDemo/mainwindow.cpp
index fe7532b4..83a41652 100644
--- a/examples/QT/SioChatDemo/mainwindow.cpp
+++ b/examples/QT/SioChatDemo/mainwindow.cpp
@@ -137,7 +137,7 @@ void MainWindow::RemoveListItem(QListWidgetItem* item)
 }
 
 
-void MainWindow::OnNewMessage(std::string const& name,message::ptr const& data,bool hasAck,message::ptr &ack_resp)
+void MainWindow::OnNewMessage(std::string const& name,message::ptr const& data,bool hasAck,message::list &ack_resp)
 {
 
     if(data->get_flag() == message::flag_object)
@@ -152,7 +152,7 @@ void MainWindow::OnNewMessage(std::string const& name,message::ptr const& data,b
     }
 }
 
-void MainWindow::OnUserJoined(std::string const& name,message::ptr const& data,bool hasAck,message::ptr &ack_resp)
+void MainWindow::OnUserJoined(std::string const& name,message::ptr const& data,bool hasAck,message::list &ack_resp)
 {
     if(data->get_flag() == message::flag_object)
     {
@@ -181,7 +181,7 @@ void MainWindow::OnUserJoined(std::string const& name,message::ptr const& data,b
 
 }
 
-void MainWindow::OnUserLeft(std::string const& name,message::ptr const& data,bool hasAck,message::ptr &ack_resp)
+void MainWindow::OnUserLeft(std::string const& name,message::ptr const& data,bool hasAck,message::list &ack_resp)
 {
     if(data->get_flag() == message::flag_object)
     {
@@ -209,7 +209,7 @@ void MainWindow::OnUserLeft(std::string const& name,message::ptr const& data,boo
     }
 }
 
-void MainWindow::OnTyping(std::string const& name,message::ptr const& data,bool hasAck,message::ptr &ack_resp)
+void MainWindow::OnTyping(std::string const& name,message::ptr const& data,bool hasAck,message::list &ack_resp)
 {
     if(m_typingItem == NULL)
     {
@@ -223,7 +223,7 @@ void MainWindow::OnTyping(std::string const& name,message::ptr const& data,bool
     }
 }
 
-void MainWindow::OnStopTyping(std::string const& name,message::ptr const& data,bool hasAck,message::ptr &ack_resp)
+void MainWindow::OnStopTyping(std::string const& name,message::ptr const& data,bool hasAck,message::list &ack_resp)
 {
     if(m_typingItem != NULL)
     {
@@ -232,7 +232,7 @@ void MainWindow::OnStopTyping(std::string const& name,message::ptr const& data,b
     }
 }
 
-void MainWindow::OnLogin(std::string const& name,message::ptr const& data,bool hasAck,message::ptr &ack_resp)
+void MainWindow::OnLogin(std::string const& name,message::ptr const& data,bool hasAck,message::list &ack_resp)
 {
     Q_EMIT RequestToggleInputs(true);
     int numUser = data->get_map()["numUsers"]->get_int();
diff --git a/examples/QT/SioChatDemo/mainwindow.h b/examples/QT/SioChatDemo/mainwindow.h
index 49147add..df32afe8 100644
--- a/examples/QT/SioChatDemo/mainwindow.h
+++ b/examples/QT/SioChatDemo/mainwindow.h
@@ -41,12 +41,12 @@ private Q_SLOTS:
     void NicknameAccept();
     void NicknameCancelled();
 private:
-    void OnNewMessage(std::string const& name,message::ptr const& data,bool hasAck,message::ptr &ack_resp);
-    void OnUserJoined(std::string const& name,message::ptr const& data,bool hasAck,message::ptr &ack_resp);
-    void OnUserLeft(std::string const& name,message::ptr const& data,bool hasAck,message::ptr &ack_resp);
-    void OnTyping(std::string const& name,message::ptr const& data,bool hasAck,message::ptr &ack_resp);
-    void OnStopTyping(std::string const& name,message::ptr const& data,bool hasAck,message::ptr &ack_resp);
-    void OnLogin(std::string const& name,message::ptr const& data,bool hasAck,message::ptr &ack_resp);
+    void OnNewMessage(std::string const& name,message::ptr const& data,bool hasAck,message::list &ack_resp);
+    void OnUserJoined(std::string const& name,message::ptr const& data,bool hasAck,message::list &ack_resp);
+    void OnUserLeft(std::string const& name,message::ptr const& data,bool hasAck,message::list &ack_resp);
+    void OnTyping(std::string const& name,message::ptr const& data,bool hasAck,message::list &ack_resp);
+    void OnStopTyping(std::string const& name,message::ptr const& data,bool hasAck,message::list &ack_resp);
+    void OnLogin(std::string const& name,message::ptr const& data,bool hasAck,message::list &ack_resp);
     void OnConnected(std::string const& nsp);
     void OnClosed(client::close_reason const& reason);
     void OnFailed();
diff --git a/examples/iOS/SioChatDemo/SioChatDemo/CRViewController.mm b/examples/iOS/SioChatDemo/SioChatDemo/CRViewController.mm
index 3b45442e..6bac43da 100644
--- a/examples/iOS/SioChatDemo/SioChatDemo/CRViewController.mm
+++ b/examples/iOS/SioChatDemo/SioChatDemo/CRViewController.mm
@@ -69,7 +69,7 @@ -(void) updateUser:(NSString*)user count:(NSInteger) num joinOrLeft:(BOOL) isJoi
 
 using namespace sio;
 
-void OnNewMessage(CFTypeRef ctrl,string const& name,sio::message::ptr const& data,bool needACK,sio::message::ptr ackResp)
+void OnNewMessage(CFTypeRef ctrl,string const& name,sio::message::ptr const& data,bool needACK,sio::message::list ackResp)
 {
     if(data->get_flag() == message::flag_object)
     {
@@ -82,7 +82,7 @@ void OnNewMessage(CFTypeRef ctrl,string const& name,sio::message::ptr const& dat
    
 }
 
-void OnTyping(CFTypeRef ctrl,string const& name,sio::message::ptr const& data,bool needACK,sio::message::ptr ackResp)
+void OnTyping(CFTypeRef ctrl,string const& name,sio::message::ptr const& data,bool needACK,sio::message::list ackResp)
 {
     if(data->get_flag() == message::flag_object)
     {
@@ -93,7 +93,7 @@ void OnTyping(CFTypeRef ctrl,string const& name,sio::message::ptr const& data,bo
     }
 }
 
-void OnStopTyping(CFTypeRef ctrl,string const& name,sio::message::ptr const& data,bool needACK,sio::message::ptr ackResp)
+void OnStopTyping(CFTypeRef ctrl,string const& name,sio::message::ptr const& data,bool needACK,sio::message::list ackResp)
 {
     if(data->get_flag() == message::flag_object)
     {
@@ -104,7 +104,7 @@ void OnStopTyping(CFTypeRef ctrl,string const& name,sio::message::ptr const& dat
     }
 }
 
-void OnUserJoined(CFTypeRef ctrl, string const& name, sio::message::ptr const& data, bool needACK, sio::message::ptr ackResp)
+void OnUserJoined(CFTypeRef ctrl, string const& name, sio::message::ptr const& data, bool needACK, sio::message::list ackResp)
 {
     if(data->get_flag() == message::flag_object)
     {
@@ -116,7 +116,7 @@ void OnUserJoined(CFTypeRef ctrl, string const& name, sio::message::ptr const& d
     }
 }
 
-void OnUserLeft(CFTypeRef ctrl, string const& name, sio::message::ptr const& data, bool needACK, sio::message::ptr ackResp)
+void OnUserLeft(CFTypeRef ctrl, string const& name, sio::message::ptr const& data, bool needACK, sio::message::list ackResp)
 {
     if(data->get_flag() == message::flag_object)
     {
@@ -129,7 +129,7 @@ void OnUserLeft(CFTypeRef ctrl, string const& name, sio::message::ptr const& dat
 }
 
 
-void OnLogin(CFTypeRef ctrl, string const& name, sio::message::ptr const& data, bool needACK, sio::message::ptr ackResp)
+void OnLogin(CFTypeRef ctrl, string const& name, sio::message::ptr const& data, bool needACK, sio::message::list ackResp)
 {
     if(data->get_flag() == message::flag_object)
     {
diff --git a/src/sio_message.h b/src/sio_message.h
index 6aaa6956..17ba2ad1 100755
--- a/src/sio_message.h
+++ b/src/sio_message.h
@@ -307,6 +307,12 @@ namespace sio
             m_vector(std::move(rhs.m_vector))
         {
 
+        }
+
+        list & operator= (const message::list && rhs)
+        {
+            m_vector = std::move(rhs.m_vector);
+            return *this;
         }
 
 		template <typename T>
@@ -385,6 +391,13 @@ namespace sio
             return arr;
         }
 
+        message::ptr to_array_message() const
+        {
+            message::ptr arr = array_message::create();
+            arr->get_vector().insert(arr->get_vector().end(),m_vector.begin(),m_vector.end());
+            return arr;
+        }
+
     private:
         vector<message::ptr> m_vector;
     };
diff --git a/src/sio_socket.cpp b/src/sio_socket.cpp
index 6be373da..b48134e9 100644
--- a/src/sio_socket.cpp
+++ b/src/sio_socket.cpp
@@ -67,10 +67,10 @@ namespace sio
         return m_need_ack;
     }
     
-    void event::put_ack_message(message::ptr const& ack_message)
+    void event::put_ack_message(message::list const& ack_message)
     {
         if(m_need_ack)
-            m_ack_message = ack_message;
+            m_ack_message = std::move(ack_message);
     }
     
     inline
@@ -91,13 +91,13 @@ namespace sio
     {
     }
     
-    message::ptr const& event::get_ack_message() const
+    message::list const& event::get_ack_message() const
     {
         return m_ack_message;
     }
     
     inline
-    message::ptr& event::get_ack_message_impl()
+    message::list& event::get_ack_message_impl()
     {
         return m_ack_message;
     }
@@ -155,7 +155,7 @@ namespace sio
         
         event_listener get_bind_listener_locked(string const& event);
         
-        void ack(int msgId,string const& name,message::ptr const& ack_message);
+        void ack(int msgId,string const& name,message::list const& ack_message);
         
         void timeout_connection(const boost::system::error_code &ec);
         
@@ -449,10 +449,9 @@ namespace sio
         }
     }
     
-    void socket::impl::ack(int msgId, const string &name, const message::ptr &ack_message)
+    void socket::impl::ack(int msgId, const string &name, const message::list &ack_message)
     {
-        message::list li(ack_message);
-        packet p(m_nsp, li.to_array_message(name),msgId,true);
+        packet p(m_nsp, ack_message.to_array_message(),msgId,true);
         send_packet(p);
     }
     
diff --git a/src/sio_socket.h b/src/sio_socket.h
index c7cc2359..53fa95a8 100644
--- a/src/sio_socket.h
+++ b/src/sio_socket.h
@@ -19,22 +19,22 @@ namespace sio
         
         bool need_ack() const;
         
-        void put_ack_message(message::ptr const& ack_message);
+        void put_ack_message(message::list const& ack_message);
         
-        message::ptr const& get_ack_message() const;
+        message::list const& get_ack_message() const;
         
     protected:
         event(std::string const& nsp,std::string const& name,message::list const& messages,bool need_ack);
         event(std::string const& nsp,std::string const& name,message::list&& messages,bool need_ack);
 
-        message::ptr& get_ack_message_impl();
+        message::list& get_ack_message_impl();
         
     private:
         const std::string m_nsp;
         const std::string m_name;
         const message::list m_messages;
         const bool m_need_ack;
-        message::ptr m_ack_message;
+        message::list m_ack_message;
         
         friend class event_adapter;
     };
@@ -46,7 +46,7 @@ namespace sio
     class socket
     {
     public:
-        typedef std::function<void(const std::string& name,message::ptr const& message,bool need_ack, message::ptr& ack_message)> event_listener_aux;
+        typedef std::function<void(const std::string& name,message::ptr const& message,bool need_ack, message::list& ack_message)> event_listener_aux;
         
         typedef std::function<void(event& event)> event_listener;