Vi2StatsSigmasIterator.h

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// -*- mode: c++ -*-
//# Copyright (C) 1996,1997,1998,1999,2000,2002,2003,2015
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library is distributed in the hope that it will be useful, but WITHOUT
//# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
//# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
//# License for more details.
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//# along with this library; if not, write to the Free Software Foundation,
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//#
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//
// Data provider weights iterators, based on sigma column
//
#ifndef MSVIS_STATISTICS_VI2_STATS_SIGMAS_ITERATOR_H_
#define MSVIS_STATISTICS_VI2_STATS_SIGMAS_ITERATOR_H_

#include <casacore/casa/aips.h>
#include <msvis/MSVis/VisibilityIterator2.h>
#include <msvis/MSVis/VisBuffer2.h>
#include <iterator>

namespace casa {

// Vi2StatsSigmasIterator has the form of a CRTP base class to promote
// efficiency in iterator operations.  The weights provided by these iterators
// are converted from sigmas according to 1/(sigma^2) (except for sigma == 0).
//
template<class T>
class Vi2StatsSigmasIterator
        : public std::iterator<std::input_iterator_tag,Float> {

public:
        Vi2StatsSigmasIterator& operator++();

        Vi2StatsSigmasIterator operator++(int);

        bool operator==(const Vi2StatsSigmasIterator& rhs);

        bool operator!=(const Vi2StatsSigmasIterator& rhs);

        Float operator*();

        bool atEnd();

protected:
        Vi2StatsSigmasIterator(vi::VisBuffer2 *vb2)
                : vb2(vb2) {};

        Vi2StatsSigmasIterator() {};

        vi::VisBuffer2 *vb2;
};

// Weights iterator over sigma cube.
class Vi2StatsSigmasCubeIterator final
        : public Vi2StatsSigmasIterator<Vi2StatsSigmasCubeIterator> {

public:
        Vi2StatsSigmasCubeIterator(vi::VisBuffer2 *vb2);

        Vi2StatsSigmasCubeIterator();

        Vi2StatsSigmasCubeIterator& operator++();

        Vi2StatsSigmasCubeIterator operator++(int);

        bool operator==(const Vi2StatsSigmasCubeIterator& rhs);

        bool operator!=(const Vi2StatsSigmasCubeIterator& rhs);

        Float operator*();

        bool atEnd();

protected:
        uInt correlation;
        uInt nCorrelations;
        uInt channel;
        uInt nChannels;
        uInt row;
        uInt nRows;
};

// Weights iterator over row sigmas.
class Vi2StatsSigmasRowIterator final
        : public Vi2StatsSigmasIterator<Vi2StatsSigmasRowIterator> {

public:
        Vi2StatsSigmasRowIterator(vi::VisBuffer2 *vb2);

        Vi2StatsSigmasRowIterator();

        Vi2StatsSigmasRowIterator& operator++();

        Vi2StatsSigmasRowIterator operator++(int);

        bool operator==(const Vi2StatsSigmasRowIterator& rhs);

        bool operator!=(const Vi2StatsSigmasRowIterator& rhs);

        Float operator*();

        bool atEnd();

protected:
        uInt row;
        uInt nRows;
};

} // namespace casa

#endif // MSVIS_STATISTICS_VI2_STATS_SIGMAS_ITERATOR_H_