?? pgm04_18.cpp
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//// This file contains the C++ code from Program 4.18 of// "Data Structures and Algorithms// with Object-Oriented Design Patterns in C++"// by Bruno R. Preiss.//// Copyright (c) 1998 by Bruno R. Preiss, P.Eng. All rights reserved.//// http://www.pads.uwaterloo.ca/Bruno.Preiss/books/opus4/programs/pgm04_18.cpp//template <class T>void LinkedList<T>::Extract (T const& item){ ListElement<T>* ptr = head; ListElement<T>* prevPtr = 0; while (ptr != 0 && ptr->datum != item) { prevPtr = ptr; ptr = ptr->next; } if (ptr == 0) throw invalid_argument ("item not found"); if (ptr == head) head = ptr->next; else prevPtr->next = ptr->next; if (ptr == tail) tail = prevPtr; delete ptr;}
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