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/cpp/src/defaultassuantransaction.h b/lang/cpp/src/defaultassuantransaction.h
index f294ffe2..5462f5f2 100644
--- a/lang/cpp/src/defaultassuantransaction.h
+++ b/lang/cpp/src/defaultassuantransaction.h
@@ -53,9 +53,9 @@ public:
     }
 
 private:
-    /* reimp */ Error data(const char *data, size_t datalen);
-    /* reimp */ Data inquire(const char *name, const char *args, Error &err);
-    /* reimp */ Error status(const char *status, const char *args);
+    Error data(const char *data, size_t datalen) override;
+    Data inquire(const char *name, const char *args, Error &err) override;
+    Error status(const char *status, const char *args) override;
 
 private:
     std::vector< std::pair<std::string, std::string> > m_status;