Replaced EventListener with signals based on libsigc++

This replaces the rather hard to understand event dispatcher with a
probably even harder to understand templated library, but fortunately
we can rely on the available documentation.

Hopefully it will also help with the readability of our code and with
adding additional signals to other classes.

Added libsigc++ to README and Travis CI configuration.

Reviewed-by: Erik Schilling

1 files changed, 0 insertions, 47 deletions

diff --git a/src/game-server/entity.cpp b/src/game-server/entity.cpp
index 671ef5e6..6cb61e58 100644
--- a/src/game-server/entity.cpp
+++ b/src/game-server/entity.cpp
@@ -18,51 +18,4 @@
  *  along with The Mana Server.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <cassert>
-
 #include "game-server/entity.h"
-
-#include "game-server/eventlistener.h"
-
-Entity::~Entity()
-{
-    /* As another object will stop listening and call removeListener when it is
-       deleted, the following assertion ensures that all the calls to
-       removeListener have been performed will this object was still alive. It
-       is not strictly necessary, as there are cases where no removal is
-       performed (e.g. ~SpawnArea). But this is rather exceptional, so keep the
-       assertion to catch all the other forgotten calls to removeListener. */
-    assert(mListeners.empty());
-}
-
-void Entity::addListener(const EventListener *l)
-{
-    mListeners.insert(l);
-}
-
-void Entity::removeListener(const EventListener *l)
-{
-    mListeners.erase(l);
-}
-
-void Entity::inserted()
-{
-    for (Listeners::iterator i = mListeners.begin(),
-         i_end = mListeners.end(); i != i_end;)
-    {
-        const EventListener &l = **i;
-        ++i; // In case the listener removes itself from the list on the fly.
-        if (l.dispatch->inserted) l.dispatch->inserted(&l, this);
-    }
-}
-
-void Entity::removed()
-{
-    for (Listeners::iterator i = mListeners.begin(),
-         i_end = mListeners.end(); i != i_end;)
-    {
-        const EventListener &l = **i;
-        ++i; // In case the listener removes itself from the list on the fly.
-        if (l.dispatch->removed) l.dispatch->removed(&l, this);
-    }
-}