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/usr/include/torch/IOSub.h is in libtorch3-dev 3.1-2.1.

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// Copyright (C) 2003--2004 Ronan Collobert (collober@idiap.ch)
//                
// This file is part of Torch 3.1.
//
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
// 3. The name of the author may not be used to endorse or promote products
//    derived from this software without specific prior written permission.
// 
// THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
// OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
// IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
// NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
// THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef IO_SUB_INC
#define IO_SUB_INC

#include "IOBufferize.h"

namespace Torch {

/** IOSequence which does a selection of adjacent columns
    on another IOSequence, when calling #getMatrix()#.

    @author Ronan Collobert (collober@idiap.ch)
*/
class IOSub : public IOSequence
{
  public:
    IOBufferize *io_torch;
    int offset;

    /** We will select columns indexed by #offset_#...#offset_+frame_size_-1#
        of the frames provided by #io_torch_#, when calling #getSequence()#.
    */
    IOSub(IOBufferize *io_torch_, int offset_, int frame_size_);

    virtual void getSequence(int t, Sequence *sequence);
    virtual int getNumberOfFrames(int t);
    virtual int getTotalNumberOfFrames();

    virtual ~IOSub();
};

}

#endif