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returns 0 until init_iter() resets _current Here is our implementation:
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inline ilist_item* ilist:: next_iter() { ilist_item *next = _current _current = _current->next() : _current; return next; }
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Our support for iteration could be problematic if the item pointed to by _current is removed Our solution is to modify remove_front() and remove() to test whether _current addresses the item being removed If it does, _current is advanced to address the next item (or no item if the item removed is the last on the list) If all the items are removed, then _current is set to point to no item Here is our revised remove_front():
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inline void ilist::remove_front() { if ( _at_front ) { ilist_item *ptr = _at_front; _at_front = _at_front->next(); // don't want current to point to a deleted item if ( _current == ptr ) _current = _at_front; bump_down_size(); delete ptr; } }
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Here is the relevant portion of the revision of remove():
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while ( plist ) { if ( plist->value() == value ) { prev->next( plist->next() ); if ( _current == plist ) _current = prev->next();
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What if an item is inserted in front of the item _current addresses In this case, we do not modify _current To resynchronize the iteration, the user needs to invoke init_iter() On the other hand, when we initialize or copy one ilist class object with another, _current is not copied but rather is reset to address no object Here is a small program to exercise our copy constructor and copy assignment operator as well as our support of iteration:
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#include<iostream> #include "ilisth" int main() { ilist mylist; for ( int ix = 0; ix< 10; ++ix ) { mylistinsert_front( ix ); mylistinsert_end( ix ); } cout "\n" "Use of init_iter() and next_iter() " "to iterate across each list item:\n"; ilist_item *iter; for ( iter = mylistinit_iter(); iter; iter = mylistnext_iter() ) cout iter->value() " "; cout "\n" "Use of copy constructor\n"; ilist mylist2( mylist ); mylistremove_all(); for ( iter = mylist2init_iter(); iter; iter = mylist2next_iter() ) cout iter->value() " "; cout "\n" "Use of copy assignment operator\n"; mylist = mylist2; for ( iter = mylistinit_iter(); iter; iter = mylistnext_iter() ) cout iter->value() " "; cout "\n"; }
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When compiled and executed, this program generates the following output:
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Use 9 8 Use 9 8 Use 9 8
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of init_iter() and next_iter() to 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 8 of copy constructor 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 8 of copy assignment operator 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 8
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iterate across each list item: 9 9 9
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Providing a Generic List Class Our ilist class is severely constrained in that it currently can hold elements only of type int A more generally useful list type should provide support both for built-in and for class types How might we transform our ilist class to support a wider variety of element types without either extensive reprogramming or code duplication The class template mechanism provides a solution (it is discussed in detail in 16) Through parameterization, the class template factors out type-dependent aspects of our class design in our case, the underlying type of the element our list contains Later, the user, wishing a particular kind of list, provides the actual type for the template parameter For example:
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file:///F|/WinDDK/resources/CPPPrimer/c++primerhtm (235 / 1065) [2001-3-29 11:32:05]
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list< string > slist;
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creates an instance of our list template class capable of holding string objects, whereas
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list< int > ilist;
creates an instance the equivalent of our original hand-coded ilist class Using a class template definition, we can support an unlimited number of list element types with one class template implementation Let's step through how we might do that, focusing on our list_item class The definition of a class template begins with the keyword template followed by a list of parameters marked by angle brackets A type parameter consists of either typename or class, followed by an identifier For example:
template<class elemType> class list_item;
This declares list_item to be a class template with a single type parameter elemType is an arbitrary identifier with which we chose to name our type parameter The following is an equivalent declaration of our list_item class:
template<typename elemType> class list_item;
The keywords typename and class are interchangeable typename is new to Standard C++ It is more mnemonic but, as of this writing, less widely supported than the original class keyword We predominantly use the class keyword for this reason and because old habits are difficult to change consistently In any case, here is our definition of the list_item class template:
template<class elemType> class list_item { public: list_item( elemType value, list_item *item = 0 ) : _value( value ) { if ( !item ) _next = 0; else { _next = item->_next; item->_next = this; } } elemType value() { return _value; } list_item* next() { return _next; } void next( list_item *link ) { _next = link; } void value( elemType new_value ) { _value = new_value; } private:
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