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UniqueId.h
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C/C++ Source or Header
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1998-11-23
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// $Id: UniqueId.h,v 1.6 1998/11/23 17:43:36 zeller Exp $
// Unique identifiers
// Copyright (C) 1995 Technische Universitaet Braunschweig, Germany.
// Written by Andreas Zeller <zeller@ips.cs.tu-bs.de>.
//
// This file is part of the ICE Library.
//
// The ICE Library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// The ICE Library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with the ICE Library -- see the file COPYING.LIB.
// If not, write to the Free Software Foundation, Inc.,
// 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// ICE is the incremental configuration environment.
// For details, see the ICE World-Wide-Web page,
// `http://www.cs.tu-bs.de/softech/ice/',
// or send a mail to the ICE developers <ice@ips.cs.tu-bs.de>.
#ifndef _ICE_UniqueId_h
#define _ICE_UniqueId_h
#ifdef __GNUG__
#pragma interface
#endif
// UniqueId manages unique identifiers
#include <iostream.h>
#include "bool.h"
class UniqueId {
private:
unsigned long _id; // Current Id
static unsigned long tics; // Least recently used Id
static unsigned long ids; // Counter existing Id's
public:
static bool debug;
#ifdef NDEBUG
// Optimized variant
// Create UniqueId
UniqueId(): _id(tics++) {}
// Destroy UniqueId
~UniqueId() {}
#else
// Debugging variant
// Create UniqueId
UniqueId();
// Destroy UniqueId
~UniqueId();
#endif
// Return value
operator unsigned long() const { return _id; }
// Statistics
static unsigned long inUse() { return ids; } // # of existing Ids
};
#endif