Remove mutable_data_type from Dyanmic Buffers (API Change):

API Changes:

* Code that depends on mutable_data_type should be refactored to use
  mutable_buffers_type. Classes affected are:
  - buffers_adaptor
  - flat_buffer
  - flat_static_buffer
  - multi_buffer
  - static_buffer

refs #1934

CHANGELOG.md

@@ -1,3 +1,4 @@
+* Remove `mutable_data_type` from Dyanmic Buffers (API Change)
 * Remove deprecated lowest_layer from test::stream
 * Remove handler_pointer (API Change)
 * Remove websocket::role_type (API Change)
@@ -6,6 +7,14 @@
 
 API Changes:
 
+* Code that depends on `mutable_data_type` should be refactored to use
+  `mutable_buffers_type`. Classes affected are:
+  - `buffers_adaptor`
+  - `flat_buffer`
+  - `flat_static_buffer`
+  - `multi_buffer`
+  - `static_buffer`
+
 * handler_ptr has been removed. Users should use net::bind_handler and/or 
 bind_front_handler instead.
 

include/boost/beast/core/buffers_adaptor.hpp

@@ -112,10 +112,6 @@ public:
 #else
     using const_buffers_type = subrange<false>;
 
-#ifdef BOOST_BEAST_ALLOW_DEPRECATED
-    using mutable_data_type = subrange<true>;
-#endif
-
     using mutable_buffers_type = subrange<true>;
 #endif
 

include/boost/beast/core/flat_buffer.hpp

@@ -396,8 +396,6 @@ public:
     /// The ConstBufferSequence used to represent the readable bytes.
     using const_buffers_type = net::const_buffer;
 
-    using mutable_data_type = net::mutable_buffer;
-
     /// The MutableBufferSequence used to represent the writable bytes.
     using mutable_buffers_type = net::mutable_buffer;
 

include/boost/beast/core/flat_static_buffer.hpp

@@ -114,10 +114,6 @@ public:
     /// The ConstBufferSequence used to represent the readable bytes.
     using const_buffers_type = net::const_buffer;
 
-#ifdef BOOST_BEAST_ALLOW_DEPRECATED
-    using mutable_data_type = net::mutable_buffer;
-#endif
-
     /// The MutableBufferSequence used to represent the writable bytes.
     using mutable_buffers_type = net::mutable_buffer;
 

include/boost/beast/core/multi_buffer.hpp

@@ -166,11 +166,6 @@ public:
     using const_buffers_type = subrange<false>;
 
     using mutable_buffers_type = subrange<true>;
-
-#ifdef BOOST_BEAST_ALLOW_DEPRECATED
-    using mutable_data_type = subrange<true>;
-#endif
-
 #endif
 
     /// The type of allocator used.

include/boost/beast/core/static_buffer.hpp

@@ -99,10 +99,6 @@ public:
 #else
     using const_buffers_type   = detail::buffers_pair<false>;
 
-#ifdef BOOST_BEAST_ALLOW_DEPRECATED
-    using mutable_data_type    = detail::buffers_pair<true>;
-#endif
-
     using mutable_buffers_type = detail::buffers_pair<true>;
 #endif