ExpressionBase.h

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// -*- c++ -*-
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 * Copyright 2008, 2009, 2010, 2011 LSST Corporation.
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#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<int,ND::value> Index;
    typedef Derived Self;

    Reference operator[](int 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> int getSize() const { return getSelf().template getSize<P>(); }

    Index getShape() const { return getSelf().getShape(); }

    int 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 int difference_type;
    typedef int 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