Remove dynamic_buffer_ref:

* dynamic_buffer_ref is removed, because Asio / Networking
  has introduced the DynamicBuffer_v2 concept which is incompatible
  with Beast's storage types.

The next version of Beast (1.70) will provide changes to
interoperate with Asio / Networking's new concepts.

test/beast/core/CMakeLists.txt

@@ -44,7 +44,6 @@ add_executable (tests-beast-core
     buffers_suffix.cpp
     buffers_to_string.cpp
     detect_ssl.cpp
-    dynamic_buffer_ref.cpp
     error.cpp
     file.cpp
     file_base.cpp

test/beast/core/Jamfile

@@ -32,7 +32,6 @@ local SOURCES =
     buffers_suffix.cpp
     buffers_to_string.cpp
     detect_ssl.cpp
-    dynamic_buffer_ref.cpp
     error.cpp
     file.cpp
     file_base.cpp

test/beast/core/dynamic_buffer_ref.cpp

@@ -1,73 +0,0 @@
-//
-// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
-//
-// Distributed under the Boost Software License, Version 1.0. (See accompanying
-// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-// Official repository: https://github.com/boostorg/beast
-//
-
-// Test that header file is self-contained.
-#include <boost/beast/core/dynamic_buffer_ref.hpp>
-
-#include <boost/beast/_experimental/unit_test/suite.hpp>
-#include <boost/beast/_experimental/test/stream.hpp>
-#include <boost/beast/core/flat_buffer.hpp>
-#include <boost/asio/read_until.hpp>
-
-namespace boost {
-namespace beast {
-
-namespace {
-
-template <class SyncReadStream>
-std::size_t read_line (SyncReadStream& stream, flat_buffer& buffer)
-{
-    return net::read_until(stream, dynamic_buffer_ref(buffer), "\r\n");
-}
-
-} // (anon)
-
-class dynamic_buffer_ref_test : public beast::unit_test::suite
-{
-public:
-    void
-    testJavadocs()
-    {
-        BEAST_EXPECT(static_cast<
-            std::size_t(*)(test::stream&, flat_buffer&)>(
-                &read_line<test::stream>));
-    }
-
-    void
-    testBuffer()
-    {
-        flat_buffer b;
-        b.max_size(1000);
-        auto db = dynamic_buffer_ref(b);
-        BEAST_EXPECT(db.max_size() == 1000);
-        BEAST_EXPECT(db.size() == 0);
-        BEAST_EXPECT(db.capacity() == 0);
-        db.prepare(512);
-        BEAST_EXPECT(db.size() == 0);
-        BEAST_EXPECT(db.capacity() == 512);
-        db.commit(12);
-        BEAST_EXPECT(db.size() == 12);
-        BEAST_EXPECT(db.capacity() == 512);
-        BEAST_EXPECT(buffer_bytes(db.data()) == 12);
-        db.consume(12);
-        BEAST_EXPECT(db.size() == 0);
-        BEAST_EXPECT(db.capacity() == 512);
-    }
-
-    void run() override
-    {
-        testJavadocs();
-        testBuffer();
-    }
-};
-
-BEAST_DEFINE_TESTSUITE(beast,core,dynamic_buffer_ref);
-
-} // beast
-} // boost