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ListItem( int val = 0 ); ListItem *next; int value; }; ListItem *list; ListItem *at_end; };
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The ListItem constructor is not defined inline within the definition of the class ListItem It must be defined outside the class definition Where can one define it The constructor for ListItem is not a member of class List and therefore cannot be defined in the body of class List The constructor for ListItem must be defined in global scope the scope that contains the enclosing class definition When a member function of a nested class is not defined inline in the nested class body, it must be defined outside the outermost enclosing class Here is a possible definition for the ListItem constructor However, the following syntax for the global scope definition is not correct:
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class List { public: // private: class ListItem { public: ListItem( int val = 0 ); // }; }; // error: ListItem not in scope ListItem::ListItem( int val ) { }
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The problem is that the name ListItem is not visible in global scope The use of ListItem in global scope must indicate that ListItem is a nested class within the scope of class List This is done by qualifying the class name ListItem with the name of its enclosing class List Here is the correct syntax:
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// name of nested class qualified with name of enclosing class List::ListItem::ListItem( int val ) { value = val; next = 0; }
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Note that only the nested class name is qualified The first qualifier List:: names the enclosing class It qualifies the name that follows that of the nested class ListItem The second ListItem names the constructor, not the nested class The member name in the following definition is not correct:
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// error: the constructor name is ListItem not List::ListItem List::ListItem::List::ListItem( int val ) { value = val; next = 0;
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If ListItem had declared a static member, its definition would also need to be defined in global scope The static member name in such a definition could look like this:
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int List::ListItem::static_mem = 1024;
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Note that member functions and static data members do not have to be public members of the nested class to be defined outside the class definition Private members of the class ListItem can also be defined in global scope A nested class can also be defined outside its enclosing class For example, the definition of ListItem could be provided in global scope as follows:
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class List { public: // private: // this declaration is required class ListItem; ListItem *list; ListItem *at_end; }; // name of nested class qualified with name of enclosing class class List::ListItem { public: ListItem( int val = 0 ); ListItem *next; int value; };
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In the global definition, the name of the nested class ListItem must be qualified by the name of its enclosing class List Note that the declaration of ListItem in the body of class List cannot be omitted A definition in global scope cannot be specified for a nested class if that class was not first declared as a member of its enclosing class A nested class does not have to be a public member of its enclosing class to be defined in global scope Until the definition for the nested class has been seen, only pointers and references to the nested class can be declared The declarations of List's data members list and at_end are still valid even though the class ListItem is defined in global scope because both of these members are pointers If one of these members had been an object instead of a pointer, the member declaration in class List would cause a compiler error For example:
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class List { public: // private: // this declaration is required class ListItem;
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