added type-save draw_connection method

Author: tanneberger

include/reactor-cpp/environment.hh

@@ -78,7 +78,9 @@ public:
   auto name() -> const std::string& { return name_; }
 
   // this method draw a connection between two graph elements with some properties
-  void draw_connection(BasePort& source, BasePort& sink, ConnectionProperties properties);
+  template <class T> void draw_connection(Port<T>& source, Port<T>& sink, ConnectionProperties properties) {
+    this->draw_connection(&source, &sink, properties);
+  }
   void draw_connection(BasePort* source, BasePort* sink, ConnectionProperties properties);
 
   void optimize();

lib/environment.cc

@@ -74,10 +74,6 @@ void recursive_assemble(Reactor* container) { // NOLINT
   }
 }
 
-void Environment::draw_connection(BasePort& source, BasePort& sink, ConnectionProperties properties) {
-  this->draw_connection(&source, &sink, properties);
-}
-
 void Environment::draw_connection(BasePort* source, BasePort* sink, ConnectionProperties properties) {
   if (top_environment_ == nullptr || top_environment_ == this) {
     log::Debug() << "drawing connection: " << source << " --> " << sink;