invalid.h

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00001 /* -*- C++ -*-
00002  *
00003  * This file is a part of LEMON, a generic C++ optimization library
00004  *
00005  * Copyright (C) 2003-2006
00006  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
00007  * (Egervary Research Group on Combinatorial Optimization, EGRES).
00008  *
00009  * Permission to use, modify and distribute this software is granted
00010  * provided that this copyright notice appears in all copies. For
00011  * precise terms see the accompanying LICENSE file.
00012  *
00013  * This software is provided "AS IS" with no warranty of any kind,
00014  * express or implied, and with no claim as to its suitability for any
00015  * purpose.
00016  *
00017  */
00018 
00019 #ifndef LEMON_INVALID_H
00020 #define LEMON_INVALID_H
00021 
00024 
00025 namespace lemon {
00026 
00028   
00030   
00031   struct Invalid {
00032   public:
00033     bool operator==(Invalid) { return true;  }
00034     bool operator!=(Invalid) { return false; }
00035     bool operator< (Invalid) { return false; }
00036   };
00037   
00039   
00042 
00043   //const Invalid &INVALID = *(Invalid *)0;
00044 
00045 #ifdef LEMON_ONLY_TEMPLATES
00046   const Invalid INVALID = Invalid();
00047 #else
00048   extern const Invalid INVALID;
00049 #endif
00050 
00051 } //namespace lemon
00052 
00053 #endif
00054   

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