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dynamicbuffer.h

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00001 /*
00002 
00003 Copyright (c) 2003, Cornell University
00004 All rights reserved.
00005 
00006 Redistribution and use in source and binary forms, with or without
00007 modification, are permitted provided that the following conditions are met:
00008 
00009    - Redistributions of source code must retain the above copyright notice,
00010        this list of conditions and the following disclaimer.
00011    - Redistributions in binary form must reproduce the above copyright
00012        notice, this list of conditions and the following disclaimer in the
00013        documentation and/or other materials provided with the distribution.
00014    - Neither the name of Cornell University nor the names of its
00015        contributors may be used to endorse or promote products derived from
00016        this software without specific prior written permission.
00017 
00018 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00019 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00020 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00021 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
00022 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
00023 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
00024 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00025 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
00026 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
00027 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
00028 THE POSSIBILITY OF SUCH DAMAGE.
00029 
00030 */
00031 
00032 // -*- C++ -*-
00033 
00034 #if !defined _CLUS_DYNAMICBUFFER_H_
00035 #define _CLUS_DYNAMICBUFFER_H_
00036 
00037 #include <string.h>
00038 
00039 namespace CLUS
00040 {
00041 
00042 /** Class to keep data temporarily that can grow automatically,
00043     only doubles can be stored inside */
00044 class DynamicBuffer
00045 {
00046 protected:
00047     int numcols;
00048 
00049     /// actual number of rows
00050     int numrows;
00051 
00052     /// current position
00053     int pos;
00054 
00055     /// maximum number of rows allocated so far
00056     int maxrows;
00057 
00058     /// the storage
00059     double* data; 
00060 
00061 public:
00062     DynamicBuffer(int NumCols)
00063     {
00064         numcols=NumCols;
00065         numrows=0;
00066         pos=0;
00067         maxrows=10;
00068         data = new double[maxrows*numcols];
00069     }
00070 
00071     int dim(void)
00072     {
00073         return numrows;
00074     }
00075 
00076     double* operator[](int index)
00077     {
00078         if (index>=maxrows)
00079         {
00080             maxrows*=2; // double the space
00081             double* aux = new double[maxrows*numcols];
00082             memcpy(aux, data, sizeof(double)*maxrows*numcols/2);
00083             delete [] data;
00084             data = aux;
00085         }
00086 
00087         if (index>=numrows)
00088             numrows=index+1;
00089 
00090         return data+index*numcols;
00091     }
00092 
00093     double* begin(void)
00094     {
00095         return data;
00096     }
00097 
00098     double* next(void)
00099     {
00100         return (*this)[pos++];
00101     }
00102 
00103     double* end(void)
00104     {
00105         return data+numcols*numrows;
00106     }
00107 
00108     ~DynamicBuffer(void)
00109     {
00110         if (data!=0)
00111         {
00112             delete [] data;
00113         }
00114     }
00115 };
00116 
00117 }
00118 
00119 
00120 #endif /* _CLUS_DYNAMICBUFFER_H_ */

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