00001 #ifndef GSGL_DATA_COMPARABLE_H 00002 #define GSGL_DATA_COMPARABLE_H 00003 00004 // 00005 // $Id: comparable.hpp 2 2008-03-01 20:58:50Z kulibali $ 00006 // 00007 // Copyright (c) 2008, The Periapsis Project. All rights reserved. 00008 // 00009 // Redistribution and use in source and binary forms, with or without 00010 // modification, are permitted provided that the following conditions are 00011 // met: 00012 // 00013 // * Redistributions of source code must retain the above copyright notice, 00014 // this list of conditions and the following disclaimer. 00015 // 00016 // * Redistributions in binary form must reproduce the above copyright 00017 // notice, this list of conditions and the following disclaimer in the 00018 // documentation and/or other materials provided with the distribution. 00019 // 00020 // * Neither the name of the The Periapsis Project nor the names of its 00021 // contributors may be used to endorse or promote products derived from 00022 // this software without specific prior written permission. 00023 // 00024 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 00025 // IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 00026 // TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 00027 // PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 00028 // OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00029 // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 00030 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 00031 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 00032 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 00033 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00034 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00035 // 00036 00037 #include "data/data.hpp" 00038 00039 namespace gsgl 00040 { 00041 00042 namespace data 00043 { 00044 00045 /// Abstract base class for data structures that can be compared to each other. 00046 class DATA_API comparable 00047 { 00048 public: 00049 comparable() {} 00050 virtual ~comparable() {} 00051 00052 /// Compares two objects. Implementations should check the type of the given object. 00053 virtual int compare(const comparable &) const = 0; 00054 }; // class comparable 00055 00056 inline bool operator== (const comparable & a, const comparable & b) { return a.compare(b) == 0; } 00057 inline bool operator!= (const comparable & a, const comparable & b) { return a.compare(b) != 0; } 00058 inline bool operator< (const comparable & a, const comparable & b) { return a.compare(b) < 0; } 00059 inline bool operator<= (const comparable & a, const comparable & b) { return a.compare(b) <= 0; } 00060 inline bool operator> (const comparable & a, const comparable & b) { return a.compare(b) > 0; } 00061 inline bool operator>= (const comparable & a, const comparable & b) { return a.compare(b) >= 0; } 00062 00063 } // namespace 00064 00065 } // namespace gsgl 00066 00067 #endif
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