RWTValSetIterator<T,C>

• Data Type and Member Function Indexes
• Synopsis
• Standard C++ Library Dependent!
• Description
• Persistence
• Examples
• Public Constructors
• Public Member Operators
• Public Member Functions

Member Functions

container() key() operator()() operator++() reset()

#include<rw/tvset.h>
RWTValSet<T,C> vs;
RWTValSetIterator<T,C> itr(vs);

RWTValSetIterator is supplied with Tools.h++ 7 to provide an iterator interface for class RWTValSetIterator that is backward compatable with the container iterators provided in Tools.h++ 6.x.

The order of iteration over an RWTValSet is dependent on the supplied comparator object parameter C as applied to the values stored in the container.

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. Continued increments will return a value equivalent to false until reset() is called.

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

None

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

int main(){
   RWTValSet<RWCString,greater<RWCString> > a;
   RWTValSetIterator<RWCString,greater<RWCString> > itr(a);

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

//Rejected, duplicates are not allowed
   a.insert("Steve");

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

   return 0;
}

Program Output
Steve
Mark
John

RWTValSetIterator<T,C>(RWTValSet<T,C>&s);

Creates an iterator for the set s. The iterator begins in an undefined state and must be advanced before the first element will be accessible

RWBoolean
operator()();

Advances self to the next element. If the iterator has advanced past the last element in the collection, false will be returned. Otherwise, true will be returned.

RWBoolean
operator++();

Advances self to the next element. If the iterator has been reset or just created self will now reference the first element. If, before iteration, self referenced the last association in the set, self will now reference an undefined value and false will be returned. Otherwise, true is returned. Note: no postincrement operator is provided.

RWTValSet<T,C>*
container() const; 

Returns a pointer to the collection being iterated over.

T
key() const; 

Returns the value referenced by self.

void
reset();
void
reset(RWTValSet<T,C>& s);

Resets the iterator so that after being advanced it will reference the first element of the collection. Using reset() with no argument will reset the iterator on the current container. Supplying a RWTValSet to reset() will reset the iterator on that container.