pgm07_17.cpp

此文件为网络书籍数据结构的面向对象方法的源码

//
//   This file contains the C++ code from Program 7.17 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/pgm07_17.cpp
//
void ListAsLinkedList::Withdraw (Position const& arg)
{
    Pos const& position = dynamic_cast<Pos const&> (arg);

    if (count == 0)
	throw domain_error ("list is empty");
    if (&position.list != this || position.element == 0)
	throw invalid_argument ("invalid position");

    linkedList.Extract (position.element->Datum ());
    --count;
}