diff --git a/src/sizenotifiable.cpp b/src/sizenotifiable.cpp
index 88ebb7b..3ba17ad 100644
--- a/src/sizenotifiable.cpp
+++ b/src/sizenotifiable.cpp
@@ -3,6 +3,7 @@
 #include "sdlmain.hpp"
 #include <cassert>
 #include <ciso646>
+#include <algorithm>
 
 namespace cloonel {
 	namespace implem {
@@ -30,6 +31,16 @@ namespace cloonel {
 			assert(m_sdlmain);
 			m_sdlmain->UnregisterForResChange(m_id);
 		}
+
+		///----------------------------------------------------------------------
+		///----------------------------------------------------------------------
+		void AutoRegister::Swap (AutoRegister& parOther) noexcept {
+			std::swap(m_sdlmain, parOther.m_sdlmain);
+			std::swap(m_id, parOther.m_id);
+#if !defined(NDEBUG)
+			std::swap(m_registered, parOther.m_registered);
+#endif
+		}
 	} //namespace regbehaviuors
 
 	///--------------------------------------------------------------------------
@@ -37,4 +48,11 @@ namespace cloonel {
 	void SizeNotifiableBase::NotifyResChanged (const SizeRatio& parSize) {
 		m_scaleRatio = parSize.Ratio();
 	}
+
+	///--------------------------------------------------------------------------
+	///--------------------------------------------------------------------------
+	void SizeNotifiableBase::swap (SizeNotifiableBase& parOther) noexcept {
+		std::swap(m_scaleRatio.x(), parOther.m_scaleRatio.x());
+		std::swap(m_scaleRatio.y(), parOther.m_scaleRatio.y());
+	}
 } //namespace cloonel
diff --git a/src/sizenotifiable.hpp b/src/sizenotifiable.hpp
index a945f06..0dea646 100644
--- a/src/sizenotifiable.hpp
+++ b/src/sizenotifiable.hpp
@@ -38,6 +38,7 @@ namespace cloonel {
 
 			void Register ( SizeNotifiableBase* ) const noexcept { return; }
 			void Unregister ( void ) const noexcept { return; }
+			void Swap ( DontRegister& ) noexcept { return; }
 		};
 
 		class AutoRegister {
@@ -55,9 +56,10 @@ namespace cloonel {
 
 			void Register ( SizeNotifiableBase* parNotifiable );
 			void Unregister ( void ) noexcept;
+			void Swap ( AutoRegister& parOther ) noexcept;
 
 		private:
-			SDLMain* const m_sdlmain;
+			SDLMain* m_sdlmain;
 			size_t m_id;
 #if !defined(NDEBUG)
 			bool m_registered;
@@ -71,12 +73,17 @@ namespace cloonel {
 	class SizeNotifiableBase {
 	protected:
 		SizeNotifiableBase ( void ) = default;
+		SizeNotifiableBase ( const SizeNotifiableBase& ) = delete;
 		virtual ~SizeNotifiableBase ( void ) noexcept = default;
+		SizeNotifiableBase& operator= ( const SizeNotifiableBase& ) = delete;
 
 	public:
 		virtual void NotifyResChanged ( const SizeRatio& parSize );
 		const float2& Ratio ( void ) const noexcept { return m_scaleRatio; }
 
+	protected:
+		void swap ( SizeNotifiableBase& parOther ) noexcept;
+
 	private:
 		float2 m_scaleRatio;
 	};
@@ -94,6 +101,8 @@ namespace cloonel {
 		virtual ~SizeNotifiable ( void ) noexcept {
 			this->Unregister();
 		}
+
+		void swap ( SizeNotifiable& parOther ) noexcept { SizeNotifiableBase::swap(parOther); RegisterBehaviour::swap(parOther); }
 	};
 
 	template <class RegisterBehaviour>
@@ -108,6 +117,8 @@ namespace cloonel {
 		virtual ~SizeNotifiable ( void ) noexcept {
 			this->Unregister();
 		}
+
+		void swap ( SizeNotifiable& parOther ) noexcept { SizeNotifiableBase::swap(parOther); RegisterBehaviour::swap(parOther); }
 	};
 } //namespace cloonel