Add the isSSLConnection() method (#61)

Author: an-tao

trantor/net/TcpConnection.h

@@ -94,6 +94,11 @@ class TcpConnection
     virtual size_t bytesSent() const = 0;
     virtual size_t bytesReceived() const = 0;
 
+    virtual bool isSSLConnection() const
+    {
+        return false;
+    }
+
   private:
     std::shared_ptr<void> contextPtr_;
 };

trantor/net/ssl/SSLConnection.h

@@ -50,6 +50,10 @@ class SSLConnection : public TcpConnectionImpl
     virtual ~SSLConnection()
     {
     }
+    virtual bool isSSLConnection() const override
+    {
+        return true;
+    }
 
   private:
     void doHandshaking();