28 lines
1012 B
C
28 lines
1012 B
C
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#ifndef __TLIST_H
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#define __TLIST_H
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// tlist.h
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// this is a base template class for lists
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// it is for a list of elements. An element can be of any class, but it must
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// have the operators == and = defined, so that the list can be searched
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// also the operator >> must be defined for write
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template <class Elem> class List {
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public:
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virtual Elem *Insert(const Elem &elem) {return NULL;}
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// insert elem into the list
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// returns a ptr to elem if elem inserted, NULL if elem was already there
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// i.e. doesn't put in duplicates and returns NULL for duplicates
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virtual Elem *Search(const Elem &elem) {return NULL;}
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// finds the element that matchs elem and returns it. This allows assoc
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// retrieval
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// returns NULL if the elem is not found
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virtual void Write(ostream &s) {;}
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// writes out the list of elements. Requires that the element overload the
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// stream output operator
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virtual int Empty(void) {return 0;}
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// returns true if the list is empty
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};
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#endif
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