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/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
Copyright (C) 2008 Andreas Gaida
Copyright (C) 2008 Ralph Schreyer
Copyright (C) 2008 Klaus Spanderen
This file is part of QuantLib, a free-software/open-source library
for financial quantitative analysts and developers - http://quantlib.org/
QuantLib is free software: you can redistribute it and/or modify it
under the terms of the QuantLib license. You should have received a
copy of the license along with this program; if not, please email
<quantlib-dev@lists.sf.net>. The license is also available online at
<http://quantlib.org/license.shtml>.
This program 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 license for more details.
*/
/*! \file fdmlinearopiterator.hpp
\brief iterator for a linear fdm operator
*/
#ifndef quantlib_linear_op_iterator_hpp
#define quantlib_linear_op_iterator_hpp
#include <ql/types.hpp>
#include <ql/utilities/disposable.hpp>
#include <vector>
#include <numeric>
namespace QuantLib {
class FdmLinearOpIterator {
public:
explicit FdmLinearOpIterator(Size index = 0)
: index_(index) {}
explicit FdmLinearOpIterator(const std::vector<Size>& dim)
: index_(0),
dim_(dim),
coordinates_(dim.size(), 0) {}
FdmLinearOpIterator(const std::vector<Size>& dim,
const std::vector<Size>& coordinates, Size index)
: index_(index),
dim_(dim),
coordinates_(coordinates) {}
FdmLinearOpIterator(const Disposable<FdmLinearOpIterator> & from) {
swap(const_cast<Disposable<FdmLinearOpIterator> & >(from));
}
void operator++() {
++index_;
for (Size i=0; i < dim_.size(); ++i) {
if (++coordinates_[i] == dim_[i]) {
coordinates_[i] = 0;
}
else {
break;
}
}
}
bool operator!=(const FdmLinearOpIterator& iterator) {
return index_ != iterator.index_;
}
Size index() const {
return index_;
}
const std::vector<Size> & coordinates() const {
return coordinates_;
}
void swap(FdmLinearOpIterator& iter) {
std::swap(iter.index_, index_);
dim_.swap(iter.dim_);
coordinates_.swap(iter.coordinates_);
}
private:
Size index_;
std::vector<Size> dim_;
std::vector<Size> coordinates_;
};
}
#endif
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