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NIHCL-3.0
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ITERATOR.H
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C/C++ Source or Header
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1990-05-20
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2KB
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67 lines
#ifndef ITERATOR_H
#define ITERATOR_H
/*$Header: /afs/alw.nih.gov/unix/sun4_40c/usr/local/src/nihcl-3.0/share/lib/RCS/Iterator.h,v 3.0 90/05/20 00:19:56 kgorlen Rel $*/
/* Iterator.h -- Declarations for Collection Iterators
THIS SOFTWARE FITS THE DESCRIPTION IN THE U.S. COPYRIGHT ACT OF A
"UNITED STATES GOVERNMENT WORK". IT WAS WRITTEN AS A PART OF THE
AUTHOR'S OFFICIAL DUTIES AS A GOVERNMENT EMPLOYEE. THIS MEANS IT
CANNOT BE COPYRIGHTED. THIS SOFTWARE IS FREELY AVAILABLE TO THE
PUBLIC FOR USE WITHOUT A COPYRIGHT NOTICE, AND THERE ARE NO
RESTRICTIONS ON ITS USE, NOW OR SUBSEQUENTLY.
Author:
K. E. Gorlen
Computer Systems Laboratory, DCRT
National Institutes of Health
Bethesda, MD 20892
December, 1987
$Log: Iterator.h,v $
* Revision 3.0 90/05/20 00:19:56 kgorlen
* Release for 1st edition.
*
*/
#include "Object.h"
class Collection;
class Iterator: public VIRTUAL Object {
DECLARE_MEMBERS(Iterator);
const Collection* cltn; // Collection being iterated over
public:
int index; // index of next Object
Object* ptr; // pointer to current Object or NULL
unsigned num; // object number, used by Bags
Object* state; // additional state, e.g., a Stack
protected: // storer() functions for object I/O
virtual void storer(OIOofd&) const;
virtual void storer(OIOout&) const;
public:
Iterator(const Collection&);
~Iterator();
void reset(); // reset to beginning of Collection
Object* operator()() const { return ptr; } // return current object pointer
Object* operator++(); // advance to next object in Collection
const Collection* collection() const { return cltn; }
bool operator==(const Iterator&) const;
bool operator!=(const Iterator& a) const { return !(*this==a); }
virtual void deepenShallowCopy(); // copy with cltn->deepCopy()
virtual void dumpOn(ostream& strm =cerr) const;
virtual unsigned hash() const;
virtual bool isEqual(const Object&) const;
virtual void printOn(ostream& strm =cout) const;
virtual const Class* species() const;
private: // shouldNotImplement()
virtual int compare(const Object&) const;
};
#define DO(cltn,cls,arg)\
{ cls* arg; Iterator DO_pos(cltn); while (arg = cls::castdown(DO_pos++)) {
#define OD }}
#endif