add get proxy abstraction method

alib2common/src/abstraction/AnyaryOperationAbstraction.hpp

@@ -21,7 +21,7 @@ protected:
 private:
 	virtual bool attachInput ( const std::shared_ptr < OperationAbstraction > & input, unsigned index, bool move ) override {
-		std::shared_ptr < ValueProvider < ParamType > > validData = std::dynamic_pointer_cast < ValueProvider < ParamType > > ( input );
+		std::shared_ptr < ValueProvider < ParamType > > validData = std::dynamic_pointer_cast < ValueProvider < ParamType > > ( input->getProxyAbstraction ( ) );
 		if ( validData ) {
 			if ( m_params.size ( ) < index + 1 )
 				m_params.resize ( index + 1 );

alib2common/src/abstraction/NaryOperationAbstraction.hpp

@@ -30,7 +30,7 @@ private:
 			if ( param != nullptr )
 				return false;
-			typename std::decay < decltype ( param )>::type validData = std::dynamic_pointer_cast < typename std::decay < decltype ( param ) >::type::element_type > ( input );
+			typename std::decay < decltype ( param )>::type validData = std::dynamic_pointer_cast < typename std::decay < decltype ( param ) >::type::element_type > ( input->getProxyAbstraction ( ) );
 			if ( validData ) {
 				m_moves [ index ] = move;
 				param = validData;

alib2common/src/abstraction/OperationAbstraction.hpp

@@ -45,6 +45,9 @@ public:
 		return ext::to_string ( getRuntimeReturnTypeIndex ( ) );
 	}
+	virtual std::shared_ptr < abstraction::OperationAbstraction > getProxyAbstraction ( ) {
+		return shared_from_this();
+	}
 };
 } /* namespace abstraction */