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/configuration.h b/lang/cpp/src/configuration.h
index 6993b6dd..2e577156 100644
--- a/lang/cpp/src/configuration.h
+++ b/lang/cpp/src/configuration.h
@@ -145,7 +145,7 @@ private:
 class GPGMEPP_EXPORT Option
 {
 public:
-    Option() : comp(), opt(0) {}
+    Option() : comp(), opt(nullptr) {}
     Option(const shared_gpgme_conf_comp_t &gpgme_comp, gpgme_conf_opt_t gpgme_opt)
         : comp(gpgme_comp), opt(gpgme_opt) {}
 
@@ -228,7 +228,7 @@ class GPGMEPP_EXPORT Argument
     friend class ::GpgME::Configuration::Option;
     Argument(const shared_gpgme_conf_comp_t &comp, gpgme_conf_opt_t opt, gpgme_conf_arg_t arg, bool owns);
 public:
-    Argument() : comp(), opt(0), arg(0) {}
+    Argument() : comp(), opt(nullptr), arg(nullptr) {}
     //Argument( const shared_gpgme_conf_comp_t & comp, gpgme_conf_opt_t opt, gpgme_conf_arg_t arg );
     Argument(const Argument &other);
     ~Argument();