Added virtual Callback Interface

- extracted inner class TLS::Channel::Callbacks to stand-alone class
  TLS::Callbacks.
- provided default implementations for TLS::Callbacks members executing
  calls to std::function members for backward compatibility.
- applied changes to cli, tests and TLS::Channel related classes to be
  compatible with new interface.

1 files changed, 4 insertions, 1 deletions

diff --git a/src/lib/tls/tls_client.cpp b/src/lib/tls/tls_client.cpp
index cc94aa11a..ab733d7a5 100644
--- a/src/lib/tls/tls_client.cpp
+++ b/src/lib/tls/tls_client.cpp
@@ -64,7 +64,10 @@ Client::Client(const Callbacks& callbacks,
 
 Handshake_State* Client::new_handshake_state(Handshake_IO* io)
    {
-   return new Client_Handshake_State(io, get_callbacks().handshake_msg());
+      return new Client_Handshake_State(io,
+                                        std::bind(&TLS::Callbacks::handshake_msg,
+                                                  get_callbacks(),
+                                                  std::placeholders::_1));
    }
 
 std::vector<X509_Certificate>