/* The following code declares class array,
 * an STL container (as wrapper) for arrays of constant size.
 *
 * See
 *      http://www.josuttis.com/cppcode
 * for details and the latest version.
 * See
 *      http://www.boost.org/libs/array for Documentation.
 * for documentation.
 *
 * (C) Copyright Nicolai M. Josuttis 2001.
 * Permission to copy, use, modify, sell and distribute this software
 * is granted provided this copyright notice appears in all copies.
 * This software is provided "as is" without express or implied
 * warranty, and with no claim as to its suitability for any purpose.
 *
 * 29 Jan 2004 - minor fixes (Nico Josuttis)
 * 04 Dec 2003 - update to synch with library TR1 (Alisdair Meredith)
 * 23 Aug 2002 - fix for Non-MSVC compilers combined with MSVC libraries.
 * 05 Aug 2001 - minor update (Nico Josuttis)
 * 20 Jan 2001 - STLport fix (Beman Dawes)
 * 29 Sep 2000 - Initial Revision (Nico Josuttis)
 *
 * Jan 30, 2004
 */
#ifndef BOOST_ARRAY_HPP
#define BOOST_ARRAY_HPP

#include <cstddef>
#include <stdexcept>

// Handles broken standard libraries better than <iterator>
#include <boost/detail/iterator.hpp>
#include <algorithm>

// FIXES for broken compilers
#include <boost/config.hpp>


namespace boost {

    template <typename T, std::size_t N>
    class array {
      public:
        T elems[N];    // fixed-size array of elements of type T

      public:
        // type definitions
        typedef T              value_type;
        typedef T*             iterator;
        typedef const T*       const_iterator;
        typedef T&             reference;
        typedef const T&       const_reference;
        typedef std::size_t    size_type;
        typedef std::ptrdiff_t difference_type;
    
        // iterator support
        iterator begin() { return elems; }
        const_iterator begin() const { return elems; }
        iterator end() { return elems+N; }
        const_iterator end() const { return elems+N; }

        // reverse iterator support
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && !defined(BOOST_MSVC_STD_ITERATOR) && !defined(BOOST_NO_STD_ITERATOR_TRAITS)
        typedef std::reverse_iterator<iterator> reverse_iterator;
        typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
#elif defined(_MSC_VER) && (_MSC_VER == 1300) && defined(BOOST_DINKUMWARE_STDLIB) && (BOOST_DINKUMWARE_STDLIB == 310)
        // workaround for broken reverse_iterator in VC7
        typedef std::reverse_iterator<std::_Ptrit<value_type, difference_type, iterator,
                                      reference, iterator, reference> > reverse_iterator;
        typedef std::reverse_iterator<std::_Ptrit<value_type, difference_type, const_iterator,
                                      const_reference, iterator, reference> > const_reverse_iterator;
#else
        // workaround for broken reverse_iterator implementations
        typedef std::reverse_iterator<iterator,T> reverse_iterator;
        typedef std::reverse_iterator<const_iterator,T> const_reverse_iterator;
#endif

        reverse_iterator rbegin() { return reverse_iterator(end()); }
        const_reverse_iterator rbegin() const {
            return const_reverse_iterator(end());
        }
        reverse_iterator rend() { return reverse_iterator(begin()); }
        const_reverse_iterator rend() const {
            return const_reverse_iterator(begin());
        }

        // operator[]
        reference operator[](size_type i) { return elems[i]; }
        const_reference operator[](size_type i) const { return elems[i]; }

        // at() with range check
        reference at(size_type i) { rangecheck(i); return elems[i]; }
        const_reference at(size_type i) const { rangecheck(i); return elems[i]; }
    
        // front() and back()
        reference front() { return elems[0]; }
        const_reference front() const { return elems[0]; }
        reference back() { return elems[N-1]; }
        const_reference back() const { return elems[N-1]; }

        // size is constant
        static size_type size() { return N; }
        static bool empty() { return false; }
        static size_type max_size() { return N; }
        enum { static_size = N };

        // swap (note: linear complexity in N, constant for given instantiation)
        void swap (array<T,N>& y) {
            std::swap_ranges(begin(),end(),y.begin());
        }

        // direct access to data (read-only)
        const T* data() const { return elems; }

        // use array as C array (direct read/write access to data)
        T* data() { return elems; }

        // assignment with type conversion
        template <typename T2>
        array<T,N>& operator= (const array<T2,N>& rhs) {
            std::copy(rhs.begin(),rhs.end(), begin());
            return *this;
        }

        // assign one value to all elements
        void assign (const T& value)
        {
            std::fill_n(begin(),size(),value);
        }

#ifndef BOOST_NO_PRIVATE_IN_AGGREGATE
      private:
#endif
        // check range (may be private because it is static)
        static void rangecheck (size_type i) {
            if (i >= size()) { 
                throw std::out_of_range("array<>: index out of range");
            }
        }

    };

// partial specialization for arrays of size 0
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
    template <typename T>
    class array<T,0> {
      public:
        char c;  // to ensure different array intances return unique values for begin/end

      public:
        // type definitions
        typedef T              value_type;
        typedef T*             iterator;
        typedef const T*       const_iterator;
        typedef T&             reference;
        typedef const T&       const_reference;
        typedef std::size_t    size_type;
        typedef std::ptrdiff_t difference_type;

        // iterator support
        iterator begin() { return reinterpret_cast< iterator >( &c ); }
        const_iterator begin() const { return reinterpret_cast< const_iterator >( &c ); }
        iterator end() { return reinterpret_cast< iterator >( &c ); }
        const_iterator end() const { return reinterpret_cast< const_iterator >( &c ); }

        // reverse iterator support
#if !defined(BOOST_MSVC_STD_ITERATOR) && !defined(BOOST_NO_STD_ITERATOR_TRAITS)
        typedef std::reverse_iterator<iterator> reverse_iterator;
        typedef std::reverse_iterator<const_iterator> const_reverse_iterator;
#elif defined(_MSC_VER) && (_MSC_VER == 1300) && defined(BOOST_DINKUMWARE_STDLIB) && (BOOST_DINKUMWARE_STDLIB == 310)
        // workaround for broken reverse_iterator in VC7
        typedef std::reverse_iterator<std::_Ptrit<value_type, difference_type, iterator,
                                      reference, iterator, reference> > reverse_iterator;
        typedef std::reverse_iterator<std::_Ptrit<value_type, difference_type, const_iterator,
                                      const_reference, iterator, reference> > const_reverse_iterator;
#else
        // workaround for broken reverse_iterator implementations
        typedef std::reverse_iterator<iterator,T> reverse_iterator;
        typedef std::reverse_iterator<const_iterator,T> const_reverse_iterator;
#endif

        reverse_iterator rbegin() { return reverse_iterator(end()); }
        const_reverse_iterator rbegin() const {
            return const_reverse_iterator(end());
        }
        reverse_iterator rend() { return reverse_iterator(begin()); }
        const_reverse_iterator rend() const {
            return const_reverse_iterator(begin());
        }

        // at() with range check
        reference at(size_type i) {
            throw std::out_of_range("array<0>: index out of range");
        }
        const_reference at(size_type i) const {
            throw std::out_of_range("<0>: index out of range");
        }

        // size is constant
        static size_type size() { return 0; }
        static bool empty() { return true; }
        static size_type max_size() { return 0; }
        enum { static_size = 0 };

        // swap
        void swap (array<T,0>& y) {
            //  could swap value of c, but value is not part of documented array state
        }

        // direct access to data
        const T* data() const { return NULL; }
        T* data() { return NULL; }

        // assignment with type conversion
        template < typename T2 >
        array< T,0 >& operator= (const array< T2, 0>& rhs) {
            return *this;
        }

        //  Calling these operations are undefined behaviour for 0-size arrays,
        //  but Library TR1 requires their presence.
        // operator[]
        reference operator[](size_type i) { makes_no_sense(); }
        const_reference operator[](size_type i) const { makes_no_sense(); }

        // front() and back()
        reference front() { makes_no_sense(); }
        const_reference front() const { makes_no_sense(); }
        reference back() { makes_no_sense(); }
        const_reference back() const { makes_no_sense(); }

#ifndef BOOST_NO_PRIVATE_IN_AGGREGATE
      private:
#endif
        // helper for operations that have undefined behaviour for 0-size arrays,
        //  assert( false ); added to make lack of support clear
        static void makes_no_sense () {
            assert(true);
            throw std::out_of_range("array<0>: index out of range");
        }
    };
#endif

    // comparisons
    template<class T, std::size_t N>
    bool operator== (const array<T,N>& x, const array<T,N>& y) {
        return std::equal(x.begin(), x.end(), y.begin());
    }
    template<class T, std::size_t N>
    bool operator< (const array<T,N>& x, const array<T,N>& y) {
        return std::lexicographical_compare(x.begin(),x.end(),y.begin(),y.end());
    }
    template<class T, std::size_t N>
    bool operator!= (const array<T,N>& x, const array<T,N>& y) {
        return !(x==y);
    }
    template<class T, std::size_t N>
    bool operator> (const array<T,N>& x, const array<T,N>& y) {
        return y<x;
    }
    template<class T, std::size_t N>
    bool operator<= (const array<T,N>& x, const array<T,N>& y) {
        return !(y<x);
    }
    template<class T, std::size_t N>
    bool operator>= (const array<T,N>& x, const array<T,N>& y) {
        return !(x<y);
    }

    // global swap()
    template<class T, std::size_t N>
    inline void swap (array<T,N>& x, array<T,N>& y) {
        x.swap(y);
    }

} /* namespace boost */

#endif /*BOOST_ARRAY_HPP*/