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# identity.h

    00001 //
    00002 // identity.h --- definition of the Identity class
    00003 //
    00004 // Copyright (C) 1996 Limit Point Systems, Inc.
    00005 //
    00006 // Author: Curtis Janssen <cljanss@limitpt.com>
    00007 // Maintainer: LPS
    00008 //
    00009 // This file is part of the SC Toolkit.
    00010 //
    00011 // The SC Toolkit is free software; you can redistribute it and/or modify
    00012 // it under the terms of the GNU Library General Public License as published by
    00013 // the Free Software Foundation; either version 2, or (at your option)
    00014 // any later version.
    00015 //
    00016 // The SC Toolkit is distributed in the hope that it will be useful,
    00017 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00018 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00019 // GNU Library General Public License for more details.
    00020 //
    00021 // You should have received a copy of the GNU Library General Public License
    00022 // along with the SC Toolkit; see the file COPYING.LIB.  If not, write to
    00023 // the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
    00024 //
    00025 // The U.S. Government is granted a limited license as per AL 91-7.
    00026 //
    00027
    00028 #ifndef _util_ref_identity_h
    00029 #define _util_ref_identity_h
    00030
    00031 #ifdef __GNUG__
    00032 #pragma interface
    00033 #endif
    00034
    00035 #include <iostream>
    00036
    00037 #include <scconfig.h>
    00038
    00039 namespace sc {
    00040
    00041 class Identity;
    00042
    00050 class Identifier {
    00051   private:
    00052     const void* id;
    00053   public:
    00055     Identifier(): id(0) {}
    00057     Identifier(const Identity* i): id((void*)i) {}
    00059     Identifier(const Identifier& i): id(i.id) {}
    00061     ~Identifier() {}
    00062
    00064     void operator = (const Identifier& i) { id = i.id; }
    00065
    00067     int operator < (const Identifier&i) const { return id < i.id; }
    00069     int operator > (const Identifier&i) const { return id > i.id; }
    00071     int operator == (const Identifier&i) const { return id == i.id; }
    00073     int operator <= (const Identifier&i) const { return id <= i.id; }
    00075     int operator >= (const Identifier&i) const { return id >= i.id; }
    00077     int operator != (const Identifier&i) const { return id != i.id; }
    00078
    00079     void print(std::ostream&) const;
    00080 };
    00081
    00082 std::ostream & operator << (std::ostream &o, const Identifier &i);
    00083
    00089 class Identity {
    00090   public:
    00091     virtual ~Identity();
    00094     Identifier identifier() { return this; }
    00095 };
    00097 inline int lt(const Identity*i, const Identity*j) { return i < j; }
    00099 inline int gt(const Identity*i, const Identity*j) { return i > j; }
    00101 inline int le(const Identity*i, const Identity*j) { return i <= j; }
    00103 inline int ge(const Identity*i, const Identity*j) { return i >= j; }
    00105 inline int eq(const Identity*i, const Identity*j) { return i == j; }
    00107 inline int ne(const Identity*i, const Identity*j) { return i != j; }
    00110 inline int cmp(const Identity*i, const Identity*j)
    00111 {
    00112   return (i==j)?0:((i<j)?-1:1);
    00113 }
    00114
    00115 }
    00116
    00117 #endif
    00118
    00119 // Local Variables:
    00120 // mode: c++
    00121 // c-file-style: "CLJ"
    00122 // End: