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RWTPtrHashMapIterator<K,T,H,EQ>

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

Synopsis

#include<rw/tphdict.h>
RWTPtrHashMap<K,T,H,EQ> m;
RWTPtrHashMap<K,T,H,EQ> itr(m); 

Please Note!


If you have the Standard C++ Library, use the interface described here. Otherwise, use the interface for RWTPtrHashDictionaryIterator described in Appendix A.


Description

RWTPtrHashMapIterator is supplied with Tools.h++ 7.x to provide an iterator interface to the Standard Library based collections that has backward compatibility with the container iterators provided in Tools.h++ 6.x.

Iteration over an RWTPtrHashMap is pseudorandom and dependent on the capacity of the underlying hash table and the hash function being used.

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 preincrement or operator().

For both operator++ and operator(), iterating past the last element will return a value equivalent to boolean false. Once this state is reached, 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

Examples

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

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

int main(){
   RWTPtrHashMap
     <RWCString,int,silly_h,equal_to<RWCString> > age;

   RWTPtrHashMapIterator
     <RWCString,int,silly_h,equal_to<RWCString> > itr(age);

   age.insert(new RWCString("John"),new int(30));
   age.insert(new RWCString("Steve"),new int(17));
   age.insert(new RWCString("Mark"),new int(24));

//Duplicate insertion is rejected
   age.insert(new RWCString("Steve"),new int(24));

   for(;++itr;)
     cout << *itr.key() << "\'s age is " << *itr.value() << endl;

   return 0;
}

Program Output (not necessarily in this order)
John's age is 30
Mark's age is 24
Steve's age is 17

Public Constructors

RWTPtrHashMapIterator<K,T,H,EQ>(RWTPtrHashMap<K,T,H,EQ>&h);

Public Member Operators

K*
operator()();
RWBoolean
operator++();

Public Member Functions

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


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