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elemType _value; list_item *_next; };
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Each earlier occurrence of int in our ilist_item class definition is replaced with the elemType parameter in our list_item class template When we write
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list_item<double> *ptr = new list_item<double>( 314 );
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the compiler automatically binds elemType to the actual type double and creates a list_item class capable of supporting elements of that type The transformation of ilist into the class template list is carried out in a similar fashion Here is the class template definition:
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template<class elemType> class list { public: list() : _at_front( 0 ), _at_end( 0 ), _current( 0 ), _size( 0 ) {} list( const list& ); list& operator=( const list& ); ~list() { remove_all(); } void insert( list_item<elemType> *ptr, elemType value ); void insert_end( elemType value ); void insert_front( elemType value ); void insert_all( const list &rhs ); int remove( elemType value ); void remove_front(); void remove_all(); list_item<elemType> *find( elemType value ); list_item<elemType> *next_iter(); list_item<elemType>* init_iter( list_item<elemType> *it ); void display( ostream &os = cout ); void concat( const list& ); void reverse(); int size() { return _size; } private: void bump_up_size() { ++_size; } void bump_down_size() { --_size; } list_item<elemType> *_at_front; list_item<elemType> *_at_end; list_item<elemType> *_current; int _size; };
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The class template objects can be used in exactly the same way as our explicitly coded ilist class objects The primary advantage is our ability to support an unlimited number of list types with a single class template definition
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Templates make up a fundamental component of Standard C++ programming In the 6, in fact, we look at the collection of template container class types provided by the standard library Not surprisingly, this includes a class template list as well as the class template vector we've already looked at in s 2 and chapter 3 The presence of the standard library list class introduces something of a dilemma We've chosen to call our class "list" as well now rather than ilist Unfortunately, that conflicts with the standard library list class We cannot now use both classes in the same program One solution, of course, is to rename our list class to remove the conflict That works in this case because, after all, it's our code In many instances that solution is not open to us The more general solution is the C++ namespace mechanism Namespaces allow the library vendor to encapsulate otherwise global names in order to prevent name collisions In addition, namespaces provide access notation to allow use of those names within our programs The C++ standard library, for example, is packaged within the std namespace Our third edition code might also be placed in a uniquely named namespace:
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namespace Primer_Third_Edition { template<typename elemType> class list_item{ }; template<typename elemType> class list{ }; // }
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A user wishing to exercise our list class might write the following:
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// our list class header file #include "listh" // make definitions visible to program using namespace Primer_Third_Edition; // ok: accesses our list class list< int > ilist; //
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(Namespaces are discussed in detail in Sections 85 and 86)
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Exercise 516
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We do not define an ilist_item destructor, although the class contains a pointer member The reason is that the ilist_item class does not allocate the object addressed by _next, so it is not responsible for its deallocation A common beginner error is to provide an ilist destructor defined as follows:
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// a bad design choice ilist_item::~ilist_item() { delete _next; }
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Looking at remove_all() or remove_front(), explain why the presence of this destructor is a bad design choice
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Exercise 517
Our ilist class does not support either of these statements:
void ilist::remove_end(); void ilist::remove( ilist_item* );