MultiParamFieldIterator.h

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/* -*- mode: c++ -*- */
//# MultiParamFielditerator.h: Multiple parameter iterator over Records
//# Copyright (C) 1997,1998,1999,2000,2001,2002,2003
//# 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.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
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//#        Postal address: AIPS++ Project Office
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#ifndef MULTI_PARAM_FIELD_ITERATOR_H_
#define MULTI_PARAM_FIELD_ITERATOR_H_

#include <synthesis/ImagerObjects/ParamFieldIterator.h>
#include <casa/Containers/Record.h>
#include <iterator>
#include <array>

namespace casa {

template<size_t N>
class MultiParamFieldIterator
        : public std::iterator<std::forward_iterator_tag, std::array<Record *,N>,
                               int> {
        std::array<Record *,N> records;
        String prefix;
        uInt field_index;

public:
        MultiParamFieldIterator()
                : records(std::array<Record *,N> {})
                , prefix(String(""))
                , field_index(0) {};

        MultiParamFieldIterator(
                std::array<Record *,N> &recs, const string prefix = "")
                : records(recs)
                , prefix(String(prefix))
                , field_index(0) {};

        MultiParamFieldIterator(const MultiParamFieldIterator &fit)
                : records(fit.records)
                , prefix(fit.prefix)
                , field_index(fit.field_index) {};

        MultiParamFieldIterator operator++() {
                ++field_index;
                return *this;
        };

        MultiParamFieldIterator operator++(int) {
                MultiParamFieldIterator tmp(*this);
                operator++();
                return tmp;
        };

        bool operator==(const MultiParamFieldIterator &rhs) {
                return records == rhs.records
                        && field_index == rhs.field_index
                        && prefix == rhs.prefix;
        };

        bool operator!=(const MultiParamFieldIterator &rhs) {
                return !operator==(rhs);
        };

        std::array<Record *,N> operator*() {
                std::array<Record *,N> result;
                String field_name = prefix + String::toString(field_index);
                for (size_t i = 0; i < N; ++i)
                        result[i] = &records[i]->rwSubRecord(field_name);
                return result;
        };

        static MultiParamFieldIterator<N> begin(std::array<Record *,N> &recs,
                                                const string &prefix = "") {
                return MultiParamFieldIterator(recs, prefix);
        };

        static MultiParamFieldIterator<N> end(std::array<Record *,N> &recs,
                                              const string &prefix = "") {
                MultiParamFieldIterator result(recs, prefix);
                result.field_index = recs[0]->nfields();
                return result;
        };
};

} // namespace casa

#endif // MULTI_PARAM_FIELD_ITERATOR_H_