diff --git a/compatible_edition/include/st_asio_wrapper.h b/compatible_edition/include/st_asio_wrapper.h
index 199be78207ac27b758f489e3d7f5b97ed4c26269..ccba63f308cd019892ba0c3291cf6a2ed436fa0d 100644
--- a/compatible_edition/include/st_asio_wrapper.h
+++ b/compatible_edition/include/st_asio_wrapper.h
@@ -24,7 +24,7 @@
 
 #ifdef _MSC_VER
 	#if _MSC_VER >= 1600
-		#warning Your compiler is Visual C++ 10.0 or higher, you can use the standard edition to gain some performance improvement.
+		#pragma message("Your compiler is Visual C++ 10.0 or higher, you can use the standard edition to gain some performance improvement.")
 	#endif
 #elif defined(__GNUC__)
 	//After a roughly reading from gcc.gnu.org and clang.llvm.org, I believed that the minimum version of GCC and Clang that support c++0x
diff --git a/compatible_edition/include/st_asio_wrapper_base.h b/compatible_edition/include/st_asio_wrapper_base.h
index 08d406450d35a0a83fe31f5e59ffaf996af507b9..69dea7ff3b8e748c3ae27ec57c34cbc6a45b2bfc 100644
--- a/compatible_edition/include/st_asio_wrapper_base.h
+++ b/compatible_edition/include/st_asio_wrapper_base.h
@@ -157,9 +157,6 @@ public:
 protected:
 	buffer_type buffer;
 };
-typedef auto_buffer<i_buffer> replaceable_buffer;
-//replaceable_packer and replaceable_unpacker used replaceable_buffer as their msg type, so they're replaceable,
-//shared_buffer<i_buffer> is available too.
 
 //convert '->' operation to '.' operation
 //user need to allocate object, and shared_buffer will free it
@@ -193,6 +190,9 @@ protected:
 };
 //not like auto_buffer, shared_buffer is copyable, but auto_buffer is a bit more efficient.
 
+typedef auto_buffer<i_buffer> replaceable_buffer;
+//packer or/and unpacker used replaceable_buffer (or shared_buffer) as their msg type will be replaceable.
+
 //packer concept
 template<typename MsgType>
 class i_packer
diff --git a/file_server/file_server.cpp b/file_server/file_server.cpp
index 7b30fd15760b6f106da37de6f53f89db8c8c0861..c6ab086ff7ab441e768bf2eacd624859f453c4ca 100644
--- a/file_server/file_server.cpp
+++ b/file_server/file_server.cpp
@@ -12,11 +12,7 @@
 //but file_server only receive talking message, not send talking message proactively), the previous message has been
 //sent to file_client, so sending buffer will always be empty, which means we will never operate sending buffer concurrently,
 //so need no locks.
-#if !defined(_MSC_VER) || _MSC_VER > 1800
-#define ST_ASIO_DEFAULT_PACKER	replaceable_packer<> //before C++ 14.0, auto_buffer will lead compilation error, who can tell me why?
-#else
-#define ST_ASIO_DEFAULT_PACKER	replaceable_packer<shared_buffer<i_buffer>>
-#endif
+#define ST_ASIO_DEFAULT_PACKER	replaceable_packer<>
 //configuration
 
 #include "../include/st_asio_wrapper_server.h"
diff --git a/file_server/file_socket.cpp b/file_server/file_socket.cpp
index d0a2fd9cc845198493148a78bd012632103be7db..2e639f15c7d05d40bff96e6a469fb6b85dc24845 100644
--- a/file_server/file_socket.cpp
+++ b/file_server/file_socket.cpp
@@ -10,11 +10,7 @@
 //but file_server only receive talking message, not send talking message proactively), the previous message has been
 //sent to file_client, so sending buffer will always be empty, which means we will never operate sending buffer concurrently,
 //so need no locks.
-#if !defined(_MSC_VER) || _MSC_VER > 1800
-#define ST_ASIO_DEFAULT_PACKER	replaceable_packer<> //before C++ 14.0, auto_buffer will lead compilation error, who can tell me why?
-#else
-#define ST_ASIO_DEFAULT_PACKER	replaceable_packer<shared_buffer<i_buffer>>
-#endif
+#define ST_ASIO_DEFAULT_PACKER	replaceable_packer<>
 //configuration
 
 #include "file_socket.h"
diff --git a/include/st_asio_wrapper_base.h b/include/st_asio_wrapper_base.h
index 50c46f76a7fd22c30018c9377ba27f7d36433a27..46f008973dd2cdbf91f38c7acf1bd926b81ef4ce 100644
--- a/include/st_asio_wrapper_base.h
+++ b/include/st_asio_wrapper_base.h
@@ -154,9 +154,6 @@ public:
 protected:
 	buffer_type buffer;
 };
-typedef auto_buffer<i_buffer> replaceable_buffer;
-//replaceable_packer and replaceable_unpacker used replaceable_buffer as their msg type, so they're replaceable,
-//shared_buffer<i_buffer> is available too.
 
 //convert '->' operation to '.' operation
 //user need to allocate object, and shared_buffer will free it
@@ -193,6 +190,13 @@ protected:
 };
 //not like auto_buffer, shared_buffer is copyable, but auto_buffer is a bit more efficient.
 
+#if !defined(_MSC_VER) || _MSC_VER > 1800
+typedef auto_buffer<i_buffer> replaceable_buffer;
+#else
+typedef shared_buffer<i_buffer> replaceable_buffer; //before C++ 14.0, auto_buffer will lead compilation error, who can tell me why?
+#endif
+//packer or/and unpacker used replaceable_buffer as their msg type will be replaceable.
+
 //packer concept
 template<typename MsgType>
 class i_packer