PLearn 0.1
TMatElementIterator_decl.h
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00001 // -*- C++ -*-
00002 
00003 // PLearn (A C++ Machine Learning Library)
00004 // Copyright (C) 1998 Pascal Vincent
00005 // Copyright (C) 1999-2002 Pascal Vincent, Yoshua Bengio and University of Montreal
00006 //
00007 
00008 // Redistribution and use in source and binary forms, with or without
00009 // modification, are permitted provided that the following conditions are met:
00010 // 
00011 //  1. Redistributions of source code must retain the above copyright
00012 //     notice, this list of conditions and the following disclaimer.
00013 // 
00014 //  2. Redistributions in binary form must reproduce the above copyright
00015 //     notice, this list of conditions and the following disclaimer in the
00016 //     documentation and/or other materials provided with the distribution.
00017 // 
00018 //  3. The name of the authors may not be used to endorse or promote
00019 //     products derived from this software without specific prior written
00020 //     permission.
00021 // 
00022 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
00023 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00024 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
00025 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00026 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00027 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00028 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00029 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00030 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00031 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00032 // 
00033 // This file is part of the PLearn library. For more information on the PLearn
00034 // library, go to the PLearn Web site at www.plearn.org
00035 
00036 
00037  
00038 
00039 /* *******************************************************      
00040  * $Id: TMatElementIterator_decl.h 8247 2007-11-12 20:22:12Z nouiz $
00041  * AUTHORS: Pascal Vincent & Yoshua Bengio
00042  * This file is part of the PLearn library.
00043  ******************************************************* */
00044 
00045 
00048 #ifndef TMatTMatElementIterator_decl_INC
00049 #define TMatTMatElementIterator_decl_INC
00050 
00051 namespace PLearn {
00052 using namespace std;
00053 
00054 template<class T>
00055 class TMatElementIterator
00056 {
00057 private:
00058     int width;
00059     int mod_minus_width;
00060     T* ptr; // current element pointer
00061     T* rowend; // after-last element of current row
00062 
00063 public:
00064 
00065     typedef forward_iterator_tag iterator_category;
00066     typedef T value_type;
00067     typedef int size_type;
00068     typedef ptrdiff_t difference_type;
00069     typedef T* pointer;
00070     typedef T& reference;
00071 
00072     inline TMatElementIterator(T* begin, int width, int mod)
00073         :width(width), mod_minus_width(mod-width), ptr(begin), rowend(begin+width)
00074     {}
00075 
00076     inline TMatElementIterator<T>& operator++()
00077     { 
00078         ++ptr;
00079         if(ptr==rowend)
00080         {
00081             ptr += mod_minus_width;
00082             rowend = ptr+width; 
00083         }
00084         return *this;
00085     }
00086 
00087     inline TMatElementIterator<T> operator++(int)
00088     { 
00089         TMatElementIterator<T> prev(*this);
00090         ++ptr;
00091         if(ptr==rowend)
00092         {
00093             ptr += mod_minus_width;
00094             rowend = ptr+width; 
00095         }
00096         return prev;
00097     }
00098 
00099     inline T* operator->() const
00100     { return ptr; }
00101   
00102     inline T& operator*() const
00103     { return *ptr; }
00104 
00105     inline bool operator==(const TMatElementIterator& other)
00106     { return ptr==other.ptr; }
00107 
00108     inline bool operator!=(const TMatElementIterator& other)
00109     { return ptr!=other.ptr; }
00110 
00111 };
00112 
00113 } // end of namespace PLearn
00114 
00115 #endif
00116 
00117 
00118 /*
00119   Local Variables:
00120   mode:c++
00121   c-basic-offset:4
00122   c-file-style:"stroustrup"
00123   c-file-offsets:((innamespace . 0)(inline-open . 0))
00124   indent-tabs-mode:nil
00125   fill-column:79
00126   End:
00127 */
00128 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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