delete copy constructors and assignment operators explicitly

libs/container/hashtable.h

@@ -289,10 +289,10 @@ private:
 	void size_decrement(){
 		--m_size;
 	}
-
-	HashTable( const HashTable& other );
-	HashTable& operator=( const HashTable& other );
 public:
+	HashTable( const HashTable& other ) = delete; // not copyable
+	HashTable& operator=( const HashTable& other ) = delete; // not assignable
+
 	HashTable() : m_bucketCount( 0 ), m_buckets( 0 ), m_size( 0 ){
 		initialise();
 	}

libs/gtkutil/widget.h

@@ -81,9 +81,6 @@ class ToggleShown
 {
 	bool m_shownDeferred;
 
-	ToggleShown( const ToggleShown& other ); // NOT COPYABLE
-	ToggleShown& operator=( const ToggleShown& other ); // NOT ASSIGNABLE
-
 	static gboolean notify_visible( GtkWidget* widget, gpointer dummy, ToggleShown* self ){
 		/* destroy = notify::visible with visible = 0, thus let's filter it out  */
 		if( gtk_main_level() > 0 ){ //== 0 at destroy time
@@ -103,6 +100,9 @@ public:
 	GtkWidget* m_widget;
 	ToggleItem m_item;
 
+	ToggleShown( const ToggleShown& other ) = delete; // NOT COPYABLE
+	ToggleShown& operator=( const ToggleShown& other ) = delete; // NOT ASSIGNABLE
+
 	ToggleShown( bool shown )
 		: m_shownDeferred( shown ), m_widget( 0 ), m_item( ActiveCaller( *this ) ){
 	}

libs/imagelib.h

@@ -34,12 +34,13 @@ struct RGBAPixel
 
 class RGBAImage : public Image
 {
-	RGBAImage( const RGBAImage& other );
-	RGBAImage& operator=( const RGBAImage& other );
 public:
 	RGBAPixel* pixels;
 	unsigned int width, height;
 
+	RGBAImage( const RGBAImage& other ) = delete; // not copyable
+	RGBAImage& operator=( const RGBAImage& other ) = delete; // not assignable
+
 	RGBAImage( unsigned int _width, unsigned int _height )
 		: pixels( new RGBAPixel[_width * _height] ), width( _width ), height( _height ){
 	}