generic_iterator_eastl.h

/*
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modification, are permitted provided that the following conditions
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    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.
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    its contributors may be used to endorse or promote products derived
    from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY ELECTRONIC ARTS AND ITS CONTRIBUTORS "AS IS" AND ANY
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// EASTL/internal/generic_iterator.h
//
// Written and maintained by Paul Pedriana - 2005.

// Implements a generic iterator from a given iteratable type, such as a pointer.
// We cannot put this file into our own iterator.h file because we need to
// still be able to use this file when we have our iterator.h disabled.
//


#ifndef EASTL_INTERNAL_GENERIC_ITERATOR_H
#define EASTL_INTERNAL_GENERIC_ITERATOR_H


#include <stk_util/util/config_eastl.h>
#include <stk_util/util/iterator_eastl.h>
#include <stk_util/util/type_traits_eastl.h>


#ifdef _MSC_VER
    #pragma warning(push)           // VC++ generates a bogus warning that you cannot code away.
    #pragma warning(disable: 4619)  // There is no warning number 'number'.
    #pragma warning(disable: 4217)  // Member template functions cannot be used for copy-assignment or copy-construction.
#endif


namespace eastl
{

    template <typename Iterator, typename Container = void>
    class generic_iterator
    {
    protected:
        Iterator mIterator;

    public:
        typedef typename eastl::iterator_traits<Iterator>::iterator_category iterator_category;
        typedef typename eastl::iterator_traits<Iterator>::value_type        value_type;
        typedef typename eastl::iterator_traits<Iterator>::difference_type   difference_type;
        typedef typename eastl::iterator_traits<Iterator>::reference         reference;
        typedef typename eastl::iterator_traits<Iterator>::pointer           pointer;
        typedef Iterator                                                     iterator_type;
        typedef Container                                                    container_type;
        typedef generic_iterator<Iterator, Container>                        this_type;

        generic_iterator()
            : mIterator(iterator_type()) { }

        explicit generic_iterator(const iterator_type& x)
            : mIterator(x) { }

        this_type& operator=(const iterator_type& x)
            { mIterator = x; return *this; }

        template <typename Iterator2>
        generic_iterator(const generic_iterator<Iterator2, Container>& x)
            : mIterator(x.base()) { }

        reference operator*() const
            { return *mIterator; }

        pointer operator->() const
            { return mIterator; }

        this_type& operator++()
            { ++mIterator; return *this; }

        this_type operator++(int)
            { return this_type(mIterator++); }

        this_type& operator--()
            { --mIterator; return *this; }

        this_type operator--(int)
            { return this_type(mIterator--); }

        reference operator[](const difference_type& n) const
            { return mIterator[n]; }

        this_type& operator+=(const difference_type& n)
            { mIterator += n; return *this; }

        this_type operator+(const difference_type& n) const
            { return this_type(mIterator + n); }

        this_type& operator-=(const difference_type& n)
            { mIterator -= n; return *this; }

        this_type operator-(const difference_type& n) const
            { return this_type(mIterator - n); }

        const iterator_type& base() const
            { return mIterator; }

    }; // class generic_iterator





    template <typename IteratorL, typename IteratorR, typename Container>
    inline bool operator==(const generic_iterator<IteratorL, Container>& lhs, const generic_iterator<IteratorR, Container>& rhs)
        { return lhs.base() == rhs.base(); }

    template <typename Iterator, typename Container>
    inline bool operator==(const generic_iterator<Iterator, Container>& lhs, const generic_iterator<Iterator, Container>& rhs)
        { return lhs.base() == rhs.base(); }

    template <typename IteratorL, typename IteratorR, typename Container>
    inline bool operator!=(const generic_iterator<IteratorL, Container>& lhs, const generic_iterator<IteratorR, Container>& rhs)
        { return lhs.base() != rhs.base(); }

    template <typename Iterator, typename Container>
    inline bool operator!=(const generic_iterator<Iterator, Container>& lhs, const generic_iterator<Iterator, Container>& rhs)
        { return lhs.base() != rhs.base(); }

    template <typename IteratorL, typename IteratorR, typename Container>
    inline bool operator<(const generic_iterator<IteratorL, Container>& lhs, const generic_iterator<IteratorR, Container>& rhs)
        { return lhs.base() < rhs.base(); }

    template <typename Iterator, typename Container>
    inline bool operator<(const generic_iterator<Iterator, Container>& lhs, const generic_iterator<Iterator, Container>& rhs)
        { return lhs.base() < rhs.base(); }

    template <typename IteratorL, typename IteratorR, typename Container>
    inline bool operator>(const generic_iterator<IteratorL, Container>& lhs, const generic_iterator<IteratorR, Container>& rhs)
        { return lhs.base() > rhs.base(); }

    template <typename Iterator, typename Container>
    inline bool operator>(const generic_iterator<Iterator, Container>& lhs, const generic_iterator<Iterator, Container>& rhs)
        { return lhs.base() > rhs.base(); }

    template <typename IteratorL, typename IteratorR, typename Container>
    inline bool operator<=(const generic_iterator<IteratorL, Container>& lhs, const generic_iterator<IteratorR, Container>& rhs)
        { return lhs.base() <= rhs.base(); }

    template <typename Iterator, typename Container>
    inline bool operator<=(const generic_iterator<Iterator, Container>& lhs, const generic_iterator<Iterator, Container>& rhs)
        { return lhs.base() <= rhs.base(); }

    template <typename IteratorL, typename IteratorR, typename Container>
    inline bool operator>=(const generic_iterator<IteratorL, Container>& lhs, const generic_iterator<IteratorR, Container>& rhs)
        { return lhs.base() >= rhs.base(); }

    template <typename Iterator, typename Container>
    inline bool operator>=(const generic_iterator<Iterator, Container>& lhs, const generic_iterator<Iterator, Container>& rhs)
        { return lhs.base() >= rhs.base(); }

    template <typename IteratorL, typename IteratorR, typename Container>
    inline typename generic_iterator<IteratorL, Container>::difference_type
    operator-(const generic_iterator<IteratorL, Container>& lhs, const generic_iterator<IteratorR, Container>& rhs)
        { return lhs.base() - rhs.base(); }

    template <typename Iterator, typename Container>
    inline generic_iterator<Iterator, Container>
    operator+(typename generic_iterator<Iterator, Container>::difference_type n, const generic_iterator<Iterator, Container>& x)
        { return generic_iterator<Iterator, Container>(x.base() + n); }



    template <typename Iterator>
    struct is_generic_iterator : public false_type { };

    template <typename Iterator, typename Container>
    struct is_generic_iterator<generic_iterator<Iterator, Container> > : public true_type { };


} // namespace eastl


#ifdef _MSC_VER
    #pragma warning(pop)
#endif


#endif // Header include guard