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invalid.h

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00001 /* -*- C++ -*-
00002  * src/lemon/invalid.h - Part of LEMON, a generic C++ optimization library
00003  *
00004  * Copyright (C) 2004 Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
00005  * (Egervary Combinatorial Optimization Research Group, EGRES).
00006  *
00007  * Permission to use, modify and distribute this software is granted
00008  * provided that this copyright notice appears in all copies. For
00009  * precise terms see the accompanying LICENSE file.
00010  *
00011  * This software is provided "AS IS" with no warranty of any kind,
00012  * express or implied, and with no claim as to its suitability for any
00013  * purpose.
00014  *
00015  */
00016 
00017 #ifndef LEMON_INVALID_H
00018 #define LEMON_INVALID_H
00019 
00022 
00023 namespace lemon {
00024 
00026   
00028   
00029   struct Invalid {
00030   public:
00031     bool operator==(Invalid) { return true;  }
00032     bool operator!=(Invalid) { return false; }
00033     bool operator< (Invalid) { return false; }
00034   };
00035   
00037   
00040 
00041   // It is also used to convert the \c INVALID constant to the
00042   // node iterator that makes is possible to write 
00043 
00044   //extern Invalid INVALID;
00045 
00046   //const Invalid &INVALID = *(Invalid *)0;
00047   const Invalid INVALID = Invalid();
00048 
00049 } //namespace lemon
00050 
00051 #endif
00052   

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