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} inline void ilist:: insert_end( int value ) { if ( !_at_end ) _at_end = _at_front = new ilist_item( value ); else _at_end = new ilist_item( value, _at_end ); bump_up_size(); }
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find() searches the list for a value If it is present, find() returns a pointer to the value; otherwise, it returns 0 Here is its implementation:
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ilist_item* ilist:: find( int value ) { ilist_item *ptr = _at_front; while ( ptr ) { if ( ptr->value() == value ) break; ptr = ptr->next(); } return ptr; }
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find() can be used as follows:
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ilist_item *ptr = mylistfind( 8 ); mylistinsert( ptr, some_value ); or, more compactly, as mylistinsert( mylistfind( 8 ), some_value );
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Before exercising our insert operations, we'll need our display() function so that we can see just how badly or not we've fouled up our implementation display()'s algorithm is simple enough: beginning with the first element, we print each element in turn until we've printed them all Do you see why the following for loop design fails
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// oops! does not work correctly // intention: display all but last element of ilist for ( ilist_item *iter = _at_front; // start at front of list iter != _at_end; // terminate at end ++iter ) // advance one item cout iter->value() ' '; // now display last element cout iter->value();
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The reason this fails is that the elements of a list are not stored contiguously in memory The pointer arithmetic of
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++iter;
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does not advance iter to address the next element of the ilist Rather, it adds the size in bytes of one ilist_item object to iter's address We have no idea what object, if any, iter addresses after it is incremented or whether the loop ever terminates To advance to the next ilist_item, iter must be explicitly reset after each iteration to the next item pointed to by the _next ilist_item data member:
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iter = iter->_next;
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We've encapsulated access to the _value and _next members through a set of inline access functions Here is our revised ilist_item class definition:
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class ilist_item { public: ilist_item( int value, ilist_item *item_to_link_to = 0 ); int value() { return _value; } ilist_item* next() { return _next; } void next( ilist_item *link ) { _next = link; } void value( int new_value ) { _value = new_value; } private: int _value; ilist_item *_next; };
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Here is our display() implementation using the preceding ilist_item class definition:
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#include<iostream> class ilist { public: void display( ostream &os = cout ); // }; void ilist:: display( ostream &os ) { os "\n( " _size " )( "; ilist_item *ptr = _at_front; while ( ptr ) { os ptr->value() " "; ptr = ptr->next();
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} os ")\n"; }
Here is a small program exercising our ilist class as we've defined it so far
#include<iostream> #include "ilisth" int main() { ilist mylist; for ( int ix = 0; ix< 10; ++ix ) { mylistinsert_front( ix ); mylistinsert_end( ix ); } cout "Ok: after insert_front() and insert_end()\n"; mylistdisplay(); ilist_item *it = mylistfind( 8 ); cout "\n" "Searching for the value 8: found it " ( it " yes!\n" : " no!\n" ); mylistinsert( it, 1024 ); cout "\n" "Inserting element 1024 following the value 8\n"; mylistdisplay(); int elem_cnt = mylistremove( 8 ); cout "\n" "Removed " elem_cnt " of the value 8\n"; mylistdisplay(); cout "\n" "Removed front element\n"; mylistremove_front(); mylistdisplay(); cout "\n" "Removed all elements\n"; mylistremove_all(); mylistdisplay(); }
It generates the following results when compiled and executed:
Ok: after insert_front() and insert_end() ( 20 )( 9 8 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 8 9 ) Searching for the value 8: found it yes! Inserting element 1024 following the value 8 ( 21 )( 9 8 1024 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 8 9 ) Removed 2 of the value 8 ( 19 )( 9 1024 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 9 ) Removed front element ( 18 )( 1024 7 6 5 4 3 2 1 0 0 1 2 3 4 5 6 7 9 ) Removed all elements ( 0 )( )
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