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RWTValHashSetIterator<T,H,EQ>

Data Type and Member Function Indexes
(exclusive of constructors and destructors)

Synopsis

#include<rw/tvhset.h>
RWTValHashSet<T,H,EQ> m;
RWTValHashSetIterator<T,H,EQ> itr(m);

Please Note!


If you have the Standard C++ Library, use the interface described here. Otherwise, use the restricted interface to RWTValHashTableIterator described in Appendix A. (When Tools.h++ is used without the Standard C++ Library, RWTValHashSetIterator is defined by RWTValHashTableIterator.)


Description

RWTValHashSetIterator is supplied with Tools.h++ 7 to provide an iterator interface to RWTValHashSetIterator that is backward compatible with the container iterators provided in Tools.h++ 6.x.

Iteration over an RWTValHashSet is pseudorandom and dependent on the capacity of the underlying hash table and the hash function being used. The only useable relationship between consecutive elements is that elements which are defined to be equivalent by the equivalence object, EQ, will remain adjacent.

The current item referenced by this iterator is undefined after construction or after a call to reset(). The iterator becomes valid after being advanced with either a pre-increment or an operator().

For both operator++ and operator(), iterating past the last element will return a value equivalent to boolean false. Continued increments will return a value equivalent to false until reset() is called.

The value type must have operator== defined. This requirement is imposed by the Standard C++ Library.

Persistence

None

Example

#include<rw/tvhset.h>
#include<rw/cstring.h>
#include<iostream.h>

struct silly_h{
   unsigned long operator()(const RWCString& x) const
   { return x.length() * (long)x(0); }
};

int main(){
   RWTValHashSet <RWCString, silly_h,equal_to<RWCString> > age;
   RWTValHashSetIterator
     <RWCString, silly_h, equal_to<RWCString > > itr(age);

   age.insert("John");
   age.insert("Steve");
   age.insert("Mark");

//Duplicate insertion rejected
   age.insert("Steve");

   for(;itr();) cout << itr.key() << endl;

   return 0;
}
Program Output (not necessarily in this order)
John
Steve
Mark

Public Constructors

RWTValHashSetIterator<T,H,EQ> (RWTValHashSet<T,H,EQ>&h);

Public Member Operators

RWBoolean
operator()();
RWBoolean
operator++();

Public Member Functions

RWTValHashSet<T,H,EQ>*
container() const; 
T
key() const; 
void
reset();
void
reset(RWTValHashSet<T,H,EQ>& h);


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