fix some undefined behaviour errors 2

alib2std/src/extensions/vector.hpp

@@ -134,8 +134,10 @@ ext::vector < bool, Ts ... > & operator ^= ( ext::vector < bool, Ts ... > & A, c
 	while ( itB < B.end ( ) ) // A is longer or of the same size as B
 		* ( itA._M_p ++ ) ^= * ( itB._M_p ++ ); // word-at-a-time bitwise operation
-	while ( itA < A.end ( ) ) // The rest of A above the size of B shall be flipped
-		* ( itA._M_p ++ ) = ~ * ( itA._M_p );
+	while ( itA < A.end ( ) ) { // The rest of A above the size of B shall be flipped
+		* ( itA._M_p ) = ~ * ( itA._M_p );
+		itA._M_p ++;
+	}
 	return A;
 }