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// The template and inlines for the -*- C++ -*- indirect_array class.

// Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002, 2004, 2005, 2009

//  Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the

// terms of the GNU General Public License as published by the

// Free Software Foundation; either version 3, or (at your option)

// any later version.

// This library is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

// Under Section 7 of GPL version 3, you are granted additional

// permissions described in the GCC Runtime Library Exception, version

// 3.1, as published by the Free Software Foundation.

// You should have received a copy of the GNU General Public License and

// a copy of the GCC Runtime Library Exception along with this program;

// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

// <http://www.gnu.org/licenses/>.

/** @file indirect_array.h

 *  This is an internal header file, included by other library headers.

 *  You should not attempt to use it directly.

 */

// Written by Gabriel Dos Reis <Gabriel.Dos-Reis@DPTMaths.ENS-Cachan.Fr>

#ifndef _INDIRECT_ARRAY_H

#define _INDIRECT_ARRAY_H 1

#pragma GCC system_header

_GLIBCXX_BEGIN_NAMESPACE(std)

  /**

   * @addtogroup numeric_arrays

   * @{

   */

  /**

   *  @brief  Reference to arbitrary subset of an array.

   *

   *  An indirect_array is a reference to the actual elements of an array

   *  specified by an ordered array of indices.  The way to get an

   *  indirect_array is to call operator[](valarray<size_t>) on a valarray.

   *  The returned indirect_array then permits carrying operations out on the

   *  referenced subset of elements in the original valarray.

   *

   *  For example, if an indirect_array is obtained using the array (4,2,0) as

   *  an argument, and then assigned to an array containing (1,2,3), then the

   *  underlying array will have array[0]==3, array[2]==2, and array[4]==1.

   *

   *  @param  Tp  Element type.

   */

  template <class _Tp>

    class indirect_array

    {

    public:

      typedef _Tp value_type;

      // _GLIBCXX_RESOLVE_LIB_DEFECTS

      // 253. valarray helper functions are almost entirely useless

      ///  Copy constructor.  Both slices refer to the same underlying array.

      indirect_array(const indirect_array&);

      ///  Assignment operator.  Assigns elements to corresponding elements

      ///  of @a a.

      indirect_array& operator=(const indirect_array&);

      ///  Assign slice elements to corresponding elements of @a v.

      void operator=(const valarray<_Tp>&) const;

      ///  Multiply slice elements by corresponding elements of @a v.

      void operator*=(const valarray<_Tp>&) const;

      ///  Divide slice elements by corresponding elements of @a v.

      void operator/=(const valarray<_Tp>&) const;

      ///  Modulo slice elements by corresponding elements of @a v.

      void operator%=(const valarray<_Tp>&) const;

      ///  Add corresponding elements of @a v to slice elements.

      void operator+=(const valarray<_Tp>&) const;

      ///  Subtract corresponding elements of @a v from slice elements.

      void operator-=(const valarray<_Tp>&) const;

      ///  Logical xor slice elements with corresponding elements of @a v.

      void operator^=(const valarray<_Tp>&) const;

      ///  Logical and slice elements with corresponding elements of @a v.

      void operator&=(const valarray<_Tp>&) const;

      ///  Logical or slice elements with corresponding elements of @a v.

      void operator|=(const valarray<_Tp>&) const;

      ///  Left shift slice elements by corresponding elements of @a v.

      void operator<<=(const valarray<_Tp>&) const;

      ///  Right shift slice elements by corresponding elements of @a v.

      void operator>>=(const valarray<_Tp>&) const;

      ///  Assign all slice elements to @a t.

      void operator= (const _Tp&) const;

      //    ~indirect_array();

      template<class _Dom>

      void operator=(const _Expr<_Dom, _Tp>&) const;

      template<class _Dom>

      void operator*=(const _Expr<_Dom, _Tp>&) const;

      template<class _Dom>

      void operator/=(const _Expr<_Dom, _Tp>&) const;

      template<class _Dom>

      void operator%=(const _Expr<_Dom, _Tp>&) const;

      template<class _Dom>

      void operator+=(const _Expr<_Dom, _Tp>&) const;

      template<class _Dom>

      void operator-=(const _Expr<_Dom, _Tp>&) const;

      template<class _Dom>

      void operator^=(const _Expr<_Dom, _Tp>&) const;

      template<class _Dom>

      void operator&=(const _Expr<_Dom, _Tp>&) const;

      template<class _Dom>

      void operator|=(const _Expr<_Dom, _Tp>&) const;

      template<class _Dom>

      void operator<<=(const _Expr<_Dom, _Tp>&) const;

      template<class _Dom>

      void operator>>=(const _Expr<_Dom, _Tp>&) const;

    private:

      ///  Copy constructor.  Both slices refer to the same underlying array.

      indirect_array(_Array<_Tp>, size_t, _Array<size_t>);

      friend class valarray<_Tp>;

      friend class gslice_array<_Tp>;

      const size_t       _M_sz;

      const _Array<size_t> _M_index;

      const _Array<_Tp>  _M_array;

      // not implemented

      indirect_array();

    };

  template<typename _Tp>

    inline

    indirect_array<_Tp>::indirect_array(const indirect_array<_Tp>& __a)

    : _M_sz(__a._M_sz), _M_index(__a._M_index), _M_array(__a._M_array) {}

  template<typename _Tp>

    inline

    indirect_array<_Tp>::indirect_array(_Array<_Tp> __a, size_t __s,

                                        _Array<size_t> __i)

    : _M_sz(__s), _M_index(__i), _M_array(__a) {}

  template<typename _Tp>

    inline indirect_array<_Tp>&

    indirect_array<_Tp>::operator=(const indirect_array<_Tp>& __a)

    {

      std::__valarray_copy(__a._M_array, _M_sz, __a._M_index, _M_array,

                           _M_index);

      return *this;

    }

  template<typename _Tp>

    inline void

    indirect_array<_Tp>::operator=(const _Tp& __t) const

    { std::__valarray_fill(_M_array, _M_index, _M_sz, __t); }

  template<typename _Tp>

    inline void

    indirect_array<_Tp>::operator=(const valarray<_Tp>& __v) const

    { std::__valarray_copy(_Array<_Tp>(__v), _M_sz, _M_array, _M_index); }

  template<typename _Tp>

    template<class _Dom>

      inline void

      indirect_array<_Tp>::operator=(const _Expr<_Dom, _Tp>& __e) const

      { std::__valarray_copy(__e, _M_sz, _M_array, _M_index); }

#undef _DEFINE_VALARRAY_OPERATOR

#define _DEFINE_VALARRAY_OPERATOR(_Op, _Name)                           \

  template<typename _Tp>                                                \

    inline void                                                         \

    indirect_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const\

    {                                                                   \

      _Array_augmented_##_Name(_M_array, _M_index, _Array<_Tp>(__v), _M_sz); \

    }                                                                   \

                                                                        \

  template<typename _Tp>                                                \

    template<class _Dom>                                                \

      inline void                                                       \

      indirect_array<_Tp>::operator _Op##=(const _Expr<_Dom,_Tp>& __e) const\

      {                                                                 \

        _Array_augmented_##_Name(_M_array, _M_index, __e, _M_sz);       \

      }

_DEFINE_VALARRAY_OPERATOR(*, __multiplies)

_DEFINE_VALARRAY_OPERATOR(/, __divides)

_DEFINE_VALARRAY_OPERATOR(%, __modulus)

_DEFINE_VALARRAY_OPERATOR(+, __plus)

_DEFINE_VALARRAY_OPERATOR(-, __minus)

_DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor)

_DEFINE_VALARRAY_OPERATOR(&, __bitwise_and)

_DEFINE_VALARRAY_OPERATOR(|, __bitwise_or)

_DEFINE_VALARRAY_OPERATOR(<<, __shift_left)

_DEFINE_VALARRAY_OPERATOR(>>, __shift_right)

#undef _DEFINE_VALARRAY_OPERATOR

  // @} group numeric_arrays

_GLIBCXX_END_NAMESPACE

#endif /* _INDIRECT_ARRAY_H */