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

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