New buffers() replaces to_string() (API Change):

A new function, buffers(), returns an implementation defined object
which wraps a ConstBufferSequence and supports formatting to a
std::ostream.

The function to_string is removed, as the new implementation allows
conversion to string using boost::lexical_cast on the return value
of the call to buffers(). Streaming to an output stream is more
efficient: no dynamic allocations are performed.

Example:

    streambuf sb;
    std::cout << buffers(sb.data()) << std::endl;

examples/ssl/websocket_ssl_example.cpp

@@ -5,7 +5,7 @@
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 //
 
-#include <beast/core/to_string.hpp>
+#include <beast/core/ostream.hpp>
 #include <beast/websocket.hpp>
 #include <beast/websocket/ssl.hpp>
 #include <boost/asio.hpp>
@@ -45,5 +45,5 @@ int main()
     beast::websocket::opcode op;
     ws.read(op, sb);
     ws.close(beast::websocket::close_code::normal);
-    std::cout << to_string(sb.data()) << "\n";
+    std::cout << beast::buffers(sb.data()) << "\n";
 }