VectorIterator.hpp

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/* 
 * VectorIterator.hpp 
 *
 * Copyright (C) 2003 Thomas Seidel <thomas.seidel@univie.ac.at>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library; see the file COPYING. If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */
 
#ifndef CDPL_MATH_VECTORITERATOR_HPP
#define CDPL_MATH_VECTORITERATOR_HPP
 
#include <functional>
 
#include "CDPL/Math/Expression.hpp"
#include "CDPL/Util/IndexedElementIterator.hpp"
 
 
namespace CDPL
{
 
    namespace Math
    {
 
        template <typename E>
        class VectorElementAccessor
        {
 
            typedef E                     VectorType;
            typedef typename E::SizeType  SizeType;
            typedef typename E::Reference Reference;
 
          public:
            VectorElementAccessor(VectorType& e):
                vec(e) {}
 
            Reference operator()(SizeType i) const
            {
                return vec.get()(i);
            }
 
            bool operator==(const VectorElementAccessor& accessor) const
            {
                return (&vec.get() == &accessor.vec.get());
            }
 
          private:
            std::reference_wrapper<VectorType> vec;
        };
 
        template <typename E>
        class VectorElementAccessor<const E>
        {
 
            typedef E                          VectorType;
            typedef typename E::SizeType       SizeType;
            typedef typename E::ConstReference Reference;
 
          public:
            VectorElementAccessor(const VectorElementAccessor<E>& accessor):
                vec(accessor.vec) {}
 
            VectorElementAccessor(const VectorType& e):
                vec(e) {}
 
            Reference operator()(SizeType i) const
            {
                return vec.get()(i);
            }
 
            bool operator==(const VectorElementAccessor& accessor) const
            {
                return (&vec.get() == &accessor.vec.get());
            }
 
            VectorElementAccessor& operator=(const VectorElementAccessor<E>& accessor)
            {
                vec = std::reference_wrapper<const VectorType>(accessor.vec);
                return *this;
            }
 
          private:
            std::reference_wrapper<const VectorType> vec;
        };
 
        template <typename E>
        struct VectorIteratorTraits
        {
 
            typedef E                                                               VectorType;
            typedef typename E::SizeType                                            SizeType;
            typedef typename E::ValueType                                           ValueType;
            typedef VectorElementAccessor<E>                                        AccessorType;
            typedef Util::IndexedElementIterator<ValueType, AccessorType, SizeType> IteratorType;
 
            static IteratorType makeIterator(VectorType& e, SizeType idx)
            {
                return IteratorType(AccessorType(e), idx);
            }
        };
 
        template <typename E>
        struct VectorIteratorTraits<const E>
        {
 
            typedef E                                                                     VectorType;
            typedef typename E::SizeType                                                  SizeType;
            typedef typename E::ValueType                                                 ValueType;
            typedef VectorElementAccessor<const E>                                        AccessorType;
            typedef Util::IndexedElementIterator<const ValueType, AccessorType, SizeType> IteratorType;
 
            static IteratorType makeIterator(const VectorType& e, SizeType idx)
            {
                return IteratorType(AccessorType(e), idx);
            }
        };
 
        template <typename E>
        typename VectorIteratorTraits<E>::IteratorType vectorBegin(VectorExpression<E>& e)
        {
            return VectorIteratorTraits<E>::makeIterator(e(), 0);
        }
 
        template <typename E>
        typename VectorIteratorTraits<E>::IteratorType vectorEnd(VectorExpression<E>& e)
        {
            return VectorIteratorTraits<E>::makeIterator(e(), e().getSize());
        }
 
        template <typename E>
        typename VectorIteratorTraits<const E>::IteratorType vectorBegin(const VectorExpression<E>& e)
        {
            return VectorIteratorTraits<const E>::makeIterator(e(), 0);
        }
 
        template <typename E>
        typename VectorIteratorTraits<const E>::IteratorType vectorEnd(const VectorExpression<E>& e)
        {
            return VectorIteratorTraits<const E>::makeIterator(e(), e().getSize());
        }
    } // namespace Math
} // namespace CDPL
 
#endif // CDPL_MATH_VECTORITERATOR_HPP