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/qgpgmesecretkeyexportjob.cpp b/lang/qt/src/qgpgmesecretkeyexportjob.cpp
index 0a410179..d77a50ab 100644
--- a/lang/qt/src/qgpgmesecretkeyexportjob.cpp
+++ b/lang/qt/src/qgpgmesecretkeyexportjob.cpp
@@ -52,8 +52,8 @@
 #include <assert.h>
 
 QGpgME::QGpgMESecretKeyExportJob::QGpgMESecretKeyExportJob(bool armour, const QString &charset)
-    : ExportJob(0),
-      mProcess(0),
+    : ExportJob(nullptr),
+      mProcess(nullptr),
       mError(0),
       mArmour(armour),
       mCharset(charset)
@@ -114,7 +114,7 @@ void QGpgME::QGpgMESecretKeyExportJob::slotCancel()
     if (mProcess) {
         mProcess->kill();
     }
-    mProcess = 0;
+    mProcess = nullptr;
     mError = GpgME::Error::fromCode(GPG_ERR_CANCELED, GPG_ERR_SOURCE_GPGSM);
 }