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, 2 insertions, 2 deletions

diff --git a/lang/cpp/src/gpgsetexpirytimeeditinteractor.h b/lang/cpp/src/gpgsetexpirytimeeditinteractor.h
index 6a4c7373..6c96b214 100644
--- a/lang/cpp/src/gpgsetexpirytimeeditinteractor.h
+++ b/lang/cpp/src/gpgsetexpirytimeeditinteractor.h
@@ -39,8 +39,8 @@ public:
     ~GpgSetExpiryTimeEditInteractor();
 
 private:
-    /* reimp */ const char *action(Error &err) const;
-    /* reimp */ unsigned int nextState(unsigned int statusCode, const char *args, Error &err) const;
+    const char *action(Error &err) const override;
+    unsigned int nextState(unsigned int statusCode, const char *args, Error &err) const override;
 
 private:
     const std::string m_strtime;