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/context.h b/lang/cpp/src/context.h
index d3700e03..b6b902a9 100644
--- a/lang/cpp/src/context.h
+++ b/lang/cpp/src/context.h
@@ -70,7 +70,7 @@ public:
     static Context *createForProtocol(Protocol proto);
     /** Same as above but returning a unique ptr. */
     static std::unique_ptr<Context> create(Protocol proto);
-    static std::unique_ptr<Context> createForEngine(Engine engine, Error *err = 0);
+    static std::unique_ptr<Context> createForEngine(Engine engine, Error *err = nullptr);
     virtual ~Context();
 
     //
@@ -161,7 +161,7 @@ public:
     // Key Listing
     //
 
-    GpgME::Error startKeyListing(const char *pattern = 0, bool secretOnly = false);
+    GpgME::Error startKeyListing(const char *pattern = nullptr, bool secretOnly = false);
     GpgME::Error startKeyListing(const char *patterns[], bool secretOnly = false);
 
     Key nextKey(GpgME::Error &e);