get rid of Key() move operations

Because of Impl, there's no way this can work properly.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

app/actions.cpp

@@ -624,12 +624,9 @@ int Rename::run(const std::string& path) {
       std::cerr << path << ": " << _("No Exif data found in the file\n");
       return -3;
     }
-    Exiv2::ExifKey key("Exif.Photo.DateTimeOriginal");
-    auto md = exifData.findKey(key);
-    if (md == exifData.end()) {
-      key = Exiv2::ExifKey("Exif.Image.DateTime");
-      md = exifData.findKey(key);
-    }
+    auto md = exifData.findKey(Exiv2::ExifKey("Exif.Photo.DateTimeOriginal"));
+    if (md == exifData.end())
+      md = exifData.findKey(Exiv2::ExifKey("Exif.Image.DateTime"));
     if (md == exifData.end()) {
       std::cerr << _("Neither tag") << " `Exif.Photo.DateTimeOriginal' " << _("nor") << " `Exif.Image.DateTime' "
                 << _("found in the file") << " " << path << "\n";

include/exiv2/metadatum.hpp

@@ -33,6 +33,8 @@ class EXIV2API Key {
   //! Destructor
   virtual ~Key() = default;
   //@}
+  Key(Key&&) = delete;
+  Key& operator=(Key&&) = delete;
   //! @name Accessors
   //@{
   /*!
@@ -74,8 +76,6 @@ class EXIV2API Key {
  protected:
   Key() = default;
   Key(const Key&) = default;
-  Key(Key&&) = default;
-  Key& operator=(Key&&) = default;
   //! @name Manipulators
   //@{
   /*!

include/exiv2/tags.hpp

@@ -308,9 +308,6 @@ class EXIV2API ExifKey : public Key {
   ~ExifKey() override;
   //@}
 
-  ExifKey(ExifKey&& rhs);
-  ExifKey& operator=(ExifKey&& rhs);
-
   //! @name Manipulators
   //@{
   /*!

src/properties.cpp

@@ -5149,7 +5149,7 @@ XmpKey::XmpKey(const std::string& prefix, const std::string& property) : p_(std:
 
 XmpKey::~XmpKey() = default;
 
-XmpKey::XmpKey(const XmpKey& rhs) : p_(std::make_unique<Impl>(*rhs.p_)) {
+XmpKey::XmpKey(const XmpKey& rhs) : Key(rhs), p_(std::make_unique<Impl>(*rhs.p_)) {
 }
 
 XmpKey& XmpKey::operator=(const XmpKey& rhs) {

src/tags.cpp

@@ -264,9 +264,6 @@ ExifKey::ExifKey(const std::string& key) : p_(std::make_unique<Impl>()) {
 ExifKey::ExifKey(const ExifKey& rhs) : p_(std::make_unique<Impl>(*rhs.p_)) {
 }
 
-ExifKey::ExifKey(ExifKey&& rhs) : p_(std::make_unique<Impl>(*rhs.p_)) {
-}
-
 ExifKey::~ExifKey() = default;
 
 ExifKey& ExifKey::operator=(const ExifKey& rhs) {
@@ -277,14 +274,6 @@ ExifKey& ExifKey::operator=(const ExifKey& rhs) {
   return *this;
 }
 
-ExifKey& ExifKey::operator=(ExifKey&& rhs) {
-  if (this == &rhs)
-    return *this;
-  *p_ = *rhs.p_;
-  Key::operator=(std::move(rhs));
-  return *this;
-}
-
 void ExifKey::setIdx(int idx) {
   p_->idx_ = idx;
 }