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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
39 namespace sc {
40
41 class Identity;
42
50 class Identifier {
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) {}
61 ~Identifier() {}
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
82 std::ostream & operator << (std::ostream &o, const Identifier &i);
83
89 class Identity {
90 public:
91 virtual ~Identity();
94 Identifier identifier() { return this; }
95 };
97 inline int lt(const Identity*i, const Identity*j) { return i < j; }
99 inline int gt(const Identity*i, const Identity*j) { return i > j; }
101 inline int le(const Identity*i, const Identity*j) { return i <= j; }
103 inline int ge(const Identity*i, const Identity*j) { return i >= j; }
105 inline int eq(const Identity*i, const Identity*j) { return i == j; }
107 inline int ne(const Identity*i, const Identity*j) { return i != j; }
110 inline 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: