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/vfsmountresult.cpp b/lang/cpp/src/vfsmountresult.cpp
index 60faa385..901ccfe2 100644
--- a/lang/cpp/src/vfsmountresult.cpp
+++ b/lang/cpp/src/vfsmountresult.cpp
@@ -40,7 +40,7 @@ using namespace GpgME;
 class VfsMountResult::Private
 {
 public:
-    explicit Private(const gpgme_vfs_mount_result_t r) : mountDir(0)
+    explicit Private(const gpgme_vfs_mount_result_t r) : mountDir(nullptr)
     {
         if (r && r->mount_dir) {
             mountDir = strdup(r->mount_dir);
@@ -81,7 +81,7 @@ const char *VfsMountResult::mountDir() const
     if (d) {
         return d->mountDir;
     }
-    return 0;
+    return nullptr;
 }
 
 std::ostream &GpgME::operator<<(std::ostream &os, const VfsMountResult &result)