Module: Essential Tools Module Group: STL-based Collection Classes
Does not inherit
#include<rw/tvmset.h> RWTValMultiSet< T,C> vs; RWTValMultiSetIterator< T,C> itr(vs);
RWTValMultiSetIterator provides the traditional Tools.h++ iterator interface to the standard library-based collections. (An STL iterator interface is provided through RWTValMultiMSet::iterator.)
The order of iteration over an RWTValMultiSet 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 C++ Standard Library.
None
#include <rw/tvmset.h> #include <iostream> #include <rw/cstring.h> #include <functional> int main() { RWTValMultiSet<RWCString, std::greater<RWCString> > a; RWTValMultiSetIterator<RWCString, std::greater<RWCString> > itr(a); a.insert("John"); a.insert("Steve"); a.insert("Mark"); a.insert("Steve"); while(itr()) { std::cout << itr.key() << std::endl; } return 0; }
Program Output:
Steve Steve Mark John
RWTValMultiSetIterator<T,C,A>(RWTValMultiSet<T,C,A>& h);
Creates an iterator for the multi-set h. The iterator begins in an undefined state and must be advanced before the first element will be accessible
bool 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.
bool 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 multi-set, self will now reference an undefined value and false will be returned. Otherwise, true is returned. Note: no postincrement operator is provided.
RWTValMultiSet<T,C,A>* container() const;
Returns a pointer to the collection being iterated over.
T key();
Returns the value pointed to by self.
void reset(); void reset(RWTValMultiSet<T,C,A>& h);
Resets the iterator so that after being advanced it will point to the first element of the collection. Using reset() with no argument will reset the iterator on the current container. Supplying a RWTValMultiSet to reset() will reset the iterator on that container.
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