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, 3 insertions, 3 deletions

diff --git a/lang/qt/src/multideletejob.cpp b/lang/qt/src/multideletejob.cpp
index 67f2a78e..c3e6520d 100644
--- a/lang/qt/src/multideletejob.cpp
+++ b/lang/qt/src/multideletejob.cpp
@@ -47,9 +47,9 @@
 #include <assert.h>
 
 QGpgME::MultiDeleteJob::MultiDeleteJob(const Protocol *protocol)
-    : Job(0),
+    : Job(nullptr),
       mProtocol(protocol),
-      mJob(0)
+      mJob(nullptr)
 {
     assert(protocol);
 }
@@ -83,7 +83,7 @@ void QGpgME::MultiDeleteJob::slotCancel()
 
 void QGpgME::MultiDeleteJob::slotResult(const GpgME::Error &err)
 {
-    mJob = 0;
+    mJob = nullptr;
     GpgME::Error error = err;
     if (error ||  // error in last op
             mIt == mKeys.end() || // (shouldn't happen)