qt,cpp: Consistently use nullptr and override

* lang/cpp/src/Makefile.am, lang/qt/src/Makefile.am (AM_CPPFLAGS):
Add suggest-override and zero-as-null-pointer-constant warnings.

* lang/cpp/src/*, lang/qt/src/*: Consistenly use nullptr and override.

--
This was especially important for the headers so that downstream
users of GpgME++ or QGpgME do not get flooded by warnings if
they have these warnings enabled.

It also improves compiler errors/warnings in case of accidental
mistakes.

1 files changed, 5 insertions, 5 deletions

diff --git a/lang/cpp/src/eventloopinteractor.cpp b/lang/cpp/src/eventloopinteractor.cpp
index a30b793c..09710ad4 100644
--- a/lang/cpp/src/eventloopinteractor.cpp
+++ b/lang/cpp/src/eventloopinteractor.cpp
@@ -77,10 +77,10 @@ public:
 
 const gpgme_io_cbs EventLoopInteractor::Private::iocbs = {
     &EventLoopInteractor::Private::registerIOCb,
-    0,
+    nullptr,
     &EventLoopInteractor::Private::removeIOCb,
     &EventLoopInteractor::Private::eventIOCb,
-    0
+    nullptr
 };
 
 //
@@ -114,7 +114,7 @@ void EventLoopInteractor::Private::removeIOCb(void *tag)
             it != instance()->d->mCallbacks.end() ; ++it) {
         if (*it == tag) {
             instance()->unregisterWatcher((*it)->externalTag);
-            delete *it; *it = 0;
+            delete *it; *it = nullptr;
             instance()->d->mCallbacks.erase(it);
             return;
         }
@@ -159,7 +159,7 @@ void EventLoopInteractor::Private::eventIOCb(void *data, gpgme_event_io_t type,
 // EventLoopInteractor Implementation
 //
 
-EventLoopInteractor *EventLoopInteractor::mSelf = 0;
+EventLoopInteractor *EventLoopInteractor::mSelf = nullptr;
 
 EventLoopInteractor::EventLoopInteractor() : d(new Private)
 {
@@ -170,7 +170,7 @@ EventLoopInteractor::EventLoopInteractor() : d(new Private)
 EventLoopInteractor::~EventLoopInteractor()
 {
     // warn if there are still callbacks registered
-    mSelf = 0;
+    mSelf = nullptr;
     delete d;
 }