PLearn 0.1
ArrayAllocatorIndex.h
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00001 // -*- C++ -*-
00002 //
00003 // ArrayAllocatorIndex.h
00004 //
00005 // Copyright (C) 2000 Nicolas Chapados
00006 // 
00007 // Redistribution and use in source and binary forms, with or without
00008 //  modification, are permitted provided that the following conditions are met:
00009 // 
00010 //    1. Redistributions of source code must retain the above copyright
00011 //       notice, this list of conditions and the following disclaimer.
00012 //     
00013 //    2. Redistributions in binary form must reproduce the above copyright
00014 //       notice, this list of conditions and the following disclaimer in the
00015 //       documentation and/or other materials provided with the distribution.
00016 //       
00017 //    3. The name of the authors may not be used to endorse or promote
00018 //       products derived from this software without specific prior written
00019 //      permission. 
00020 // 
00021 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
00022 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00023 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
00024 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00025 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00026 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00027 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00028 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00029 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00030 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00031 //
00032 // This file is part of the PLearn library. For more information on the PLearn
00033 // library, go to the PLearn Web site at www.plearn.org
00034 
00035 
00036 /* *******************************************************
00037  * * $Id: ArrayAllocatorIndex.h 3994 2005-08-25 13:35:03Z chapados $
00038  * ******************************************************* */
00039 
00040 
00041 #ifndef ARRAYALLOCATORINDEX_H
00042 #define ARRAYALLOCATORINDEX_H
00043 
00044 namespace PLearn {
00045 using namespace std;
00046 
00047 
00048 
00051 template <class IndexBase, unsigned SizeBits>
00052 class ArrayAllocatorIndex {
00053 public:
00054     typedef IndexBase index_base;
00055     typedef ArrayAllocatorIndex<IndexBase,SizeBits> index_type;
00056     
00058     unsigned index : 8*sizeof(IndexBase) - SizeBits;
00059     unsigned size : SizeBits;
00060 
00061     ArrayAllocatorIndex(unsigned the_index, unsigned the_size=0)
00062         : index(the_index), size(the_size) {}
00063     
00064     bool operator==(index_type other) const {
00065         return index == other.index;     
00066     }
00067     bool operator!=(index_type other) const {
00068         return index != other.index;     
00069     }
00070     bool isNull() const {
00071         return index == 0;
00072     }
00073     void swap(index_type& other) {
00074         std::swap(index, other.index);
00075         std::swap(size,  other.size);
00076     }
00077 };
00078 
00079 } // end of namespace PLearn
00080 
00081 
00082 #endif
00083 
00084 
00085 /*
00086   Local Variables:
00087   mode:c++
00088   c-basic-offset:4
00089   c-file-style:"stroustrup"
00090   c-file-offsets:((innamespace . 0)(inline-open . 0))
00091   indent-tabs-mode:nil
00092   fill-column:79
00093   End:
00094 */
00095 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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