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138 lines (118 loc) · 4.26 KB
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// -*- c++ -*-
/*
* Copyright (c) 2010-2012, Jim Bosch
* All rights reserved.
*
* ndarray is distributed under a simple BSD-like license;
* see the LICENSE file that should be present in the root
* of the source distribution, or alternately available at:
* https://github.com/ndarray/ndarray
*/
#ifndef NDARRAY_DETAIL_BinaryOp_h_INCLUDED
#define NDARRAY_DETAIL_BinaryOp_h_INCLUDED
/**
* @file ndarray/detail/BinaryOp.h
*
* @brief Lazy binary expression templates.
*/
#include "ndarray/ExpressionBase.h"
#include "ndarray/vectorize.h"
#include <boost/iterator/iterator_adaptor.hpp>
#include <boost/iterator/zip_iterator.hpp>
#include <boost/tuple/tuple.hpp>
namespace ndarray {
namespace detail {
/**
* @internal @brief An iterator for binary expression templates.
*
* @ingroup ndarrayInternalGroup
*
* Acts as a combination "zip" and "transform" iterator.
*/
template <typename Operand1, typename Operand2, typename BinaryFunction>
class BinaryOpIterator : public boost::iterator_adaptor<
BinaryOpIterator<Operand1,Operand2,BinaryFunction>,
boost::zip_iterator<
boost::tuple<
typename ExpressionTraits<Operand1>::Iterator,
typename ExpressionTraits<Operand2>::Iterator
>
>,
typename ExpressionTraits< BinaryOpExpression<Operand1,Operand2,BinaryFunction> >::Value,
boost::use_default,
typename ExpressionTraits< BinaryOpExpression<Operand1,Operand2,BinaryFunction> >::Reference
> {
typedef BinaryOpExpression<Operand1,Operand2,BinaryFunction> Operation;
public:
typedef typename ExpressionTraits<Operand1>::Iterator BaseIterator1;
typedef typename ExpressionTraits<Operand2>::Iterator BaseIterator2;
typedef typename ExpressionTraits<Operation>::Value Value;
typedef typename ExpressionTraits<Operation>::Reference Reference;
BinaryOpIterator() : BinaryOpIterator::iterator_adaptor_(), _functor() {}
BinaryOpIterator(
BaseIterator1 const & baseIter1,
BaseIterator2 const & baseIter2,
BinaryFunction const & functor
) :
BinaryOpIterator::iterator_adaptor_(boost::make_tuple(baseIter1,baseIter2)),
_functor(functor) {}
BinaryOpIterator(BinaryOpIterator const & other) :
BinaryOpIterator::iterator_adaptor_(other), _functor(other._functor) {}
private:
friend class boost::iterator_core_access;
Reference dereference() const {
return vectorize(
_functor,
this->base_reference()->template get<0>(),
this->base_reference()->template get<1>()
);
}
BinaryFunction _functor;
};
/**
* @internal @brief A binary expression template.
*
* @ingroup ndarrayInternalGroup
*
* Represents the lazy evaluation of a binary expression.
*/
template <typename Operand1, typename Operand2, typename BinaryFunction, int N>
class BinaryOpExpression : public ExpressionBase< BinaryOpExpression<Operand1,Operand2,BinaryFunction,N> > {
typedef BinaryOpExpression<Operand1,Operand2,BinaryFunction,N> Self;
public:
typedef typename ExpressionTraits<Self>::Element Element;
typedef typename ExpressionTraits<Self>::ND ND;
typedef typename ExpressionTraits<Self>::Iterator Iterator;
typedef typename ExpressionTraits<Self>::Value Value;
typedef typename ExpressionTraits<Self>::Reference Reference;
typedef Vector<Size,N> Index;
BinaryOpExpression(
Operand1 const & operand1,
Operand2 const & operand2,
BinaryFunction const & functor
) :
_operand1(operand1), _operand2(operand2), _functor(functor) {
NDARRAY_ASSERT(_operand1.getShape() == _operand2.getShape());
}
Reference operator[](Size n) const {
return Reference(_operand1[n],_operand2[n],_functor);
}
Iterator begin() const {
return Iterator(_operand1.begin(),_operand2.begin(),_functor);
}
Iterator end() const {
return Iterator(_operand1.end(),_operand2.end(),_functor);
}
template <int P> Size getSize() const {
return _operand1.template getSize<P>();
}
Index getShape() const {
return _operand1.getShape();
}
Operand1 _operand1;
Operand2 _operand2;
BinaryFunction _functor;
};
} // namespace detail
} // namespace ndarray
#endif // !NDARRAY_DETAIL_BinaryOp_h_INCLUDED