ExpressionBase.h

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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_ExpressionBase_h_INCLUDED
#define NDARRAY_ExpressionBase_h_INCLUDED
 
#include "ndarray/ExpressionTraits.h"
#include "ndarray/Vector.h"
 
namespace ndarray {
 
template <typename Derived>
class ExpressionBase {
public:
    typedef typename ExpressionTraits<Derived>::Element Element;
    typedef typename ExpressionTraits<Derived>::ND ND;
    typedef typename ExpressionTraits<Derived>::Iterator Iterator;
    typedef typename ExpressionTraits<Derived>::Reference Reference;
    typedef typename ExpressionTraits<Derived>::Value Value;
    typedef Vector<Size,ND::value> Index;
    typedef Derived Self;
 
    Reference operator[](Size n) const { return getSelf().operator[](n); }
 
    Reference front() const { return this->operator[](0); }
 
    Reference back() const { return this->operator[](this->template getSize<0>()-1); }
 
    Iterator begin() const { return getSelf().begin(); }
 
    Iterator end() const { return getSelf().end(); }
 
    template <int P> Size getSize() const { return getSelf().template getSize<P>(); }
 
    Index getShape() const { return getSelf().getShape(); }
 
    Size getNumElements() const { return getSelf().getNumElements(); }
 
    /* ------------------------- STL Compatibility -------------------------- */
 
    typedef Value value_type;
    typedef Iterator iterator;
    typedef Iterator const_iterator;
    typedef Reference reference;
    typedef Reference const_reference;
    typedef Iterator pointer;
    typedef Offset difference_type;
    typedef Size size_type;
 
    size_type size() const { return this->template getSize<0>(); }
 
    bool empty() const { return this->template getSize<0>() == 0; }
 
    /* ---------------------------------------------------------------------- */
 
protected:
    Self & getSelf() { return *static_cast<Self *>(this); }
    Self const & getSelf() const { return *static_cast<Self const *>(this); }
};
 
} // namespace ndarray
 
#endif // !NDARRAY_ExpressionBase_h_INCLUDED