Cleanup QtCore examples

Cleanup QtCore examples:
 - use new signal/slot syntax
 - use 0 instead nullptr
 - remove unneeded includes
 - use initializer lists
 - replace foreach with range-based-for loop

Change-Id: I5581f485fa0e9ccf3f4ce6f643908832bc6959bb
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

2 files changed, 2 insertions, 2 deletions

diff --git a/examples/corelib/serialization/savegame/game.cpp b/examples/corelib/serialization/savegame/game.cpp
index 226f6fda11..c39362bc68 100644
--- a/examples/corelib/serialization/savegame/game.cpp
+++ b/examples/corelib/serialization/savegame/game.cpp
@@ -185,7 +185,7 @@ void Game::write(QJsonObject &json) const
     json["player"] = playerObject;
 
     QJsonArray levelArray;
-    for (const Level level : mLevels) {
+    for (const Level &level : mLevels) {
         QJsonObject levelObject;
         level.write(levelObject);
         levelArray.append(levelObject);
diff --git a/examples/corelib/serialization/savegame/level.cpp b/examples/corelib/serialization/savegame/level.cpp
index c7adc6c8ff..6fe46e8938 100644
--- a/examples/corelib/serialization/savegame/level.cpp
+++ b/examples/corelib/serialization/savegame/level.cpp
@@ -97,7 +97,7 @@ void Level::write(QJsonObject &json) const
 {
     json["name"] = mName;
     QJsonArray npcArray;
-    for (const Character npc : mNpcs) {
+    for (const Character &npc : mNpcs) {
         QJsonObject npcObject;
         npc.write(npcObject);
         npcArray.append(npcObject);