MPQC 2.3.1
identity.h
1//
2// identity.h --- definition of the Identity class
3//
4// Copyright (C) 1996 Limit Point Systems, Inc.
5//
6// Author: Curtis Janssen <cljanss@limitpt.com>
7// Maintainer: LPS
8//
9// This file is part of the SC Toolkit.
10//
11// The SC Toolkit is free software; you can redistribute it and/or modify
12// it under the terms of the GNU Library General Public License as published by
13// the Free Software Foundation; either version 2, or (at your option)
14// any later version.
15//
16// The SC Toolkit is distributed in the hope that it will be useful,
17// but WITHOUT ANY WARRANTY; without even the implied warranty of
18// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19// GNU Library General Public License for more details.
20//
21// You should have received a copy of the GNU Library General Public License
22// along with the SC Toolkit; see the file COPYING.LIB. If not, write to
23// the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
24//
25// The U.S. Government is granted a limited license as per AL 91-7.
26//
27
28#ifndef _util_ref_identity_h
29#define _util_ref_identity_h
30
31#ifdef __GNUG__
32#pragma interface
33#endif
34
35#include <iostream>
36
37#include <scconfig.h>
38
39namespace sc {
40
41class Identity;
42
51 private:
52 const void* id;
53 public:
55 Identifier(): id(0) {}
57 Identifier(const Identity* i): id((void*)i) {}
59 Identifier(const Identifier& i): id(i.id) {}
62
64 void operator = (const Identifier& i) { id = i.id; }
65
67 int operator < (const Identifier&i) const { return id < i.id; }
69 int operator > (const Identifier&i) const { return id > i.id; }
71 int operator == (const Identifier&i) const { return id == i.id; }
73 int operator <= (const Identifier&i) const { return id <= i.id; }
75 int operator >= (const Identifier&i) const { return id >= i.id; }
77 int operator != (const Identifier&i) const { return id != i.id; }
78
79 void print(std::ostream&) const;
80};
81
82std::ostream & operator << (std::ostream &o, const Identifier &i);
83
89class Identity {
90 public:
91 virtual ~Identity();
94 Identifier identifier() { return this; }
95};
97inline int lt(const Identity*i, const Identity*j) { return i < j; }
99inline int gt(const Identity*i, const Identity*j) { return i > j; }
101inline int le(const Identity*i, const Identity*j) { return i <= j; }
103inline int ge(const Identity*i, const Identity*j) { return i >= j; }
105inline int eq(const Identity*i, const Identity*j) { return i == j; }
107inline int ne(const Identity*i, const Identity*j) { return i != j; }
110inline int cmp(const Identity*i, const Identity*j)
111{
112 return (i==j)?0:((i<j)?-1:1);
113}
114
115}
116
117#endif
118
119// Local Variables:
120// mode: c++
121// c-file-style: "CLJ"
122// End:
Identifier's are used to distinguish and order objects.
Definition: identity.h:50
int operator>(const Identifier &i) const
Greater than.
Definition: identity.h:69
~Identifier()
The destructor does nothing.
Definition: identity.h:61
int operator!=(const Identifier &i) const
Not equal.
Definition: identity.h:77
int operator==(const Identifier &i) const
Equal.
Definition: identity.h:71
int operator<=(const Identifier &i) const
Less than or equal.
Definition: identity.h:73
Identifier(const Identifier &i)
Create an Identifier for the given object.
Definition: identity.h:59
int operator>=(const Identifier &i) const
Greater than or equal.
Definition: identity.h:75
int operator<(const Identifier &i) const
Less than.
Definition: identity.h:67
Identifier()
Create an Identifier for a null object.
Definition: identity.h:55
Identifier(const Identity *i)
Create an Identifier for the given object.
Definition: identity.h:57
void operator=(const Identifier &i)
Assign to the given Identifier.
Definition: identity.h:64
Identity gives objects a unique identity and ordering relationship relative to all other objects.
Definition: identity.h:89
Identifier identifier()
Return the Identifier for this argument.
Definition: identity.h:94

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