Lecture21 - Buffer Vector vs Stack Admin Todays topics...

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Admin Today’s topics Finish Editor Buffer case study Start Map implementation, trees Reading Ch 9 Ch 13 Café today after class Lecture #21 Buffer: Vector vs Stack Vector Stack Buffer() O(1) O(1) ~Buffer() O(1) O(1) moveCursorForward() O(1) O(1) moveCursorBackward() O(1) O(1) moveCursorToStart() O(1) O(N) moveCursorToEnd() O(1) O(N) insertCharacter() O(N) O(1) deleteCharacter() O(N) O(1) Space used 1N 2N Buffer as linked list Inspiration: contiguous memory is constraining Connect chars without locality Linked list to the rescue! Buffer contains: AB | CDE // for Buffer class private: struct cellT { char ch; cellT *next; }; cellT *head, *cursor; head cursor E A A B C C D Cursor design Where does cursor point? To cell before or after ? Where is cursor if between B & C? After E? Before A? 5 letters, 6 cursor positions… head cursor E A A B C C D
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Use of dummy cell for linked list Add "dummy cell" to front of list Simplifies logic Every cell holding actual data has a predecessor
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