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52 #ifndef _index_agent_h
53 #define _index_agent_h 1
55 #include "utility/funcs.h"
56 #include "utility/ostring.h"
57 #include "dynhash/data_t.h"
59 //**************************************************************
60 // A abstract index_agent class
61 //**************************************************************
67 virtual ~index_agent() ;
69 virtual Boolean insert(data_t& v) = 0; // insert a key
70 virtual Boolean remove(data_t& v) = 0; // remove a key
71 virtual Boolean member(data_t& v) = 0; // member test
72 virtual void clean() = 0; // remove all keys
74 virtual int no_keys() const { return n; }; // return key set size
76 virtual ostream& asciiOut(ostream& out) = 0;
77 virtual istream& asciiIn(istream& in) = 0;
80 unsigned int n; // current key set size