template <class Object> list<Object>::list( const list<Object> in Java

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template <class Object> list<Object>::list( const list<Object>
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init( i ; *this = rhs;
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template <class Object> const list<Object> & list<Object>::operator= ( const list
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if ( this
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== &rhs 1 return *this;
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makeEmpty( 1 ; const-iterator itr = rhsbegin( 1 ; while ( itr ! = rhsend( i ) push-back( *itr++ ) ; return *this;
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Figure 1725 Constructor and Big Three for the STL 1ist class
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/ / Return iterator representing beginning of list / / Mutator version is first, then accessor version
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template <class Object> list<Object>: :iterator list<Object>::begin( ) 1: iterator itr ( *this, head ) ; return ++itr;
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template <class Object>
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l i s t < O b j e c t > : : c o n s t _ i t e r a t o r list<Object>::begin( ) const
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const-iterator itr( "his, return ++itr;
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/ / Return iterator representing endmarker of list / / Mutator version is first, then accessor version
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template <class Object> list<Object>::iterator list<Object>::end( )
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return iterator( *this, tail
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template <class Object> l i s t < O b j e c t > : : c o n s t _ i t e r a t o r list<Object>::end(
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return const-iterator( *this, tail
/ / Return number of elements currently in the list template <class Object> int list<Object>::size( ) const 1: return thesize;
/ / Return true if the list is empty, false otherwise template <class Object> boo1 list<Object>::empty( ) const 1: return size( ) == 0 ;
Figure 1726 The b e g i n , end, s i z e , and empty methods for the STL l i s t class
Implementing the STL list Class
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49
/ / front, back, push-front, push-back, pop-front, and POP-back / / are the basic double-ended queue operations
template <class Object> Object & list<Object>::front(
return *begin(
template <class Object> const Object & list<Object>::front( ) const
return *begin(
template <class Object> Object & list<Object>::back(
return *--end(
template <class Object> const Object & list<Object>::back( ) const
return *--end(
template <class Object> void list<Object>::push-front( const Object
insert ( begin (
x ) ;
template <class Object> void list<Object>: :push-back ( const Object
insert ( end(
, x )
template <class Object> void list<Object>::pop-front( )
erase ( begin (
template <class Object> void list<Object>::pop-back( )
erase( --end(
Figure 1727 Double-ended queue STL list class operations
1 2 3 4 5 6 7 8 9 10 11
/ / Insert x before itr template <class Object> list<Object>::iterator list<Object>::insert( iterator itr, const Object
itrassertIsValid( 1 ; if( itrhead ! = head ) / / itr is not in this list throw Iterator~ismatchException() ; node *p = itrcurrent; p->prev->next = new node( x , p->prev, p p->prev = p->prev->next; thesize++; return iterator( *this, p->prev ) ;
/ / Erase item at itr template <class Object> list<Object>::iterator list<object>::erase( iterator itr
13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44
itrassertIsValid( ) ; if( itr = = end( ) ) / / can't erase endmarker throw ~ t e r a t o r ~ u t ~ f ~ o u n d s ~ x c e p t)i o n ( ; if( itrhead ! = head ) / / itr is not in this list throw IteratorMismatchException( ) ; node *p = itrcurrent; iterator retval( *this, p->next p->prev->next = p->next; p->next->prev = p->prev; delete p; thesize--; return retval;
/ / Erase items in the range [from,to)
template <class Object> list<Object>::iterator list<Object>::erase( iterator from, iterator to
for( iterator itr = from; itr ! = to; itr = erase( itr ) ; return to;
Figure 1728 Methods for insertion and removal from the STL 1ist class
The first version of erase contains an additional error check After- The value of i t r is ward, we perform the standard deletion in a doubly linked list; we return an after the call to iterator representing the item after the deleted element Like insert,erase erase,which is why must update theSi zeThe second version of erase simply uses an iterator erase returns an to call the first version of eraseNote that we cannot simply use itr++ in iterator the for loop at line 4 and ignore the return value of erase at line 42The 1 value of itr is stale immediately after the call to erase, which is why erase returns an iterator Figure 1729shows the class interfaces for ConstListItr and ~ i s~ t rThe iterators store the current position and a pointer to the header t Of most interest is the use of inheritance We want to be able to send an iterator to any method that accepts a const-iterator, but not vice versa SO an iterator IS-A const-iterator As a result, the private assert methods need to be written only once for the two classes At line 6, the base class destructor is declared virtual, as is normal for base classes operator* is also declared virtual However, operator++and operator-- are not virtual, mostly because their return types change The versions that do not return references cannot be virtual, whereas those that return references can be virtual because they have compatible return types (the return type changes from a reference to a )However, our base class to a reference to a derived class; see Section 4 4 4 compilers did not agree with the newer rules The iterator classes each declare operator++ and operator - - to mirror advance and retreat (see Section 233for a discussion of operator overloading) The public comparison operators and the private helper retrieve are declared in const-iterator and are inherited unchanged The iterator constructors are shown in Figure 1730and are straightforward As we mentioned earlier, the zero-parameter constructor is public, whereas the two-parameter constructor that sets the current position and the header position, is private Various assertion methods are shown in Figure 1731 All test the validity of an iterator and throw an exception if the iterator is determined to be invalid Otherwise, these methods return safely we In Figure 1732, present three versions of operator*,which is used to get the Obj ec t stored at the current position Recall that we have an accessor method that returns a constant reference and a mutator method that returns a reference (through which the Objec t can be changed) The mutator method cannot be made available for const-iterator, so we have only three methods Except for the return type, they are identical and simply call the retrieve method Various implementations of operator++ are shown in Figure 1733 The postfix version (itr++)is implemented in terms of the prefix version (++itr), the derived class versions are identical to the base class versions
1 template <class Object> 2 class ConstListItr 3 ( 4 public: 5 ConstListItr( 1 ; 6 virtual -ConstListItr ( ) ( } 7 virtual const Object & operator* ( ) const; 8 9 ConstListItr & operator++ ( ) ; 10 ConstListItr operator++ ( int ) ; 11 ConstListItr & operator-- i ) ; 12 ConstListItr operator-- ( int ) ; 13 14 boo1 operator== ( const ConstListItr & rhs ) const; 15 boo1 operator!= ( const ConstListItr & rhs ) const; 16 17 protected: 18 typedef ListNode<Object> node; 19 node *head; 20 node *current; 2 1 22 friend class llst<Object>; 23 void assertIsInitialized( ) const; 24 void assertIsValid( ) const; 25 void assertCanAdvance( ) const; 26 void assertCanRetreat( ) const; 27 Object & retrieve( ) const; 28 29 ConstListItr( const list<Object> & source, node *p 1 ; 30 1 ; 31 32 template <class Object> 33 class ListItr : public ConstListItr<Object> 34 i 35 public: 36 ListItr( ) ; 37 38 Object & operator* ( ) ; 39 const Object & operator* i ) const; 40 ListItr & operator++ ( ) ; 41 ListItr operator++ ( int ) ; 42 ListItr & operator-- ( 1 ; 43 ListItr operator-- ( int 1 : 44 45 protected: 46 typedef ListNode<Object> node; 47 friend class list<Object>; 48 49 ~ist~tr( const list<Object> & source, node *p 1 ; 50 1 ;