rtpredicate.h

一个俄国人写的内存数据库系统

// -*- Mode: C++ -*-
// Copyright (c) 1996, Regents of the University of California
// $Header: /usr/local/devel/GiST/libGiST/RTree/RTpredicate.h,v 1.1.1.1 1996/08/06 23:47:26 jmh Exp $

#ifndef RTPREDICATE_H
#define RTPREDICATE_H

#include "GiSTpredicate.h"

enum RToper {
  RToverlap,
  RTcontains,
  RTcontained,
  RTEqual
};

class RTpredicate : public GiSTpredicate {
public:
  // constructors, destructors, etc.
  RTpredicate(RToper oper, const RTkey& value) : oper(oper), value(value) {}
  RTpredicate(const RTpredicate& p) : oper(p.oper), value(p.value) {}
  GiSTobject *Copy() const { return new RTpredicate(*this); }
  GiSTobjid IsA() { return RTPREDICATE_CLASS; }

  // basic GiST methods
  int Consistent(const GiSTentry& entry) const;

  // access to private members
  void SetOper(RToper op) { oper = op; }
  void SetValue(const RTkey& v) { value = v; }

  // I/O routines
#ifdef PRINTING_OBJECTS
  void Print(ostream& os) const {
    const char *operstrs[] = { "&&", "^", "||", "=" };
    os << "key " << operstrs[oper] << " " << value;
  }
#endif
private:
  RToper oper;
  RTkey value;
};

#endif