<h2>Editing File: /usr/include/c++/8/bits/indirect_array.h</h2><form method='post'><textarea name='content' class='file-edit'>// The template and inlines for the -*- C++ -*- indirect_array class.

// Copyright (C) 1997-2018 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
// &lt;http://www.gnu.org/licenses/&gt;.

/** @file bits/indirect_array.h
 *  This is an internal header file, included by other library headers.
 *  Do not attempt to use it directly. @headername{valarray}
 */

// Written by Gabriel Dos Reis &lt;Gabriel.Dos-Reis@DPTMaths.ENS-Cachan.Fr&gt;

#ifndef _INDIRECT_ARRAY_H
#define _INDIRECT_ARRAY_H 1

#pragma GCC system_header

namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION

  /**
   * @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&lt;size_t&gt;) 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 &lt;class _Tp&gt;
    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&amp;);

      ///  Assignment operator.  Assigns elements to corresponding elements
      ///  of @a a.
      indirect_array&amp; operator=(const indirect_array&amp;);

      ///  Assign slice elements to corresponding elements of @a v.
      void operator=(const valarray&lt;_Tp&gt;&amp;) const;
      ///  Multiply slice elements by corresponding elements of @a v.
      void operator*=(const valarray&lt;_Tp&gt;&amp;) const;
      ///  Divide slice elements by corresponding elements of @a v.
      void operator/=(const valarray&lt;_Tp&gt;&amp;) const;
      ///  Modulo slice elements by corresponding elements of @a v.
      void operator%=(const valarray&lt;_Tp&gt;&amp;) const;
      ///  Add corresponding elements of @a v to slice elements.
      void operator+=(const valarray&lt;_Tp&gt;&amp;) const;
      ///  Subtract corresponding elements of @a v from slice elements.
      void operator-=(const valarray&lt;_Tp&gt;&amp;) const;
      ///  Logical xor slice elements with corresponding elements of @a v.
      void operator^=(const valarray&lt;_Tp&gt;&amp;) const;
      ///  Logical and slice elements with corresponding elements of @a v.
      void operator&amp;=(const valarray&lt;_Tp&gt;&amp;) const;
      ///  Logical or slice elements with corresponding elements of @a v.
      void operator|=(const valarray&lt;_Tp&gt;&amp;) const;
      ///  Left shift slice elements by corresponding elements of @a v.
      void operator&lt;&lt;=(const valarray&lt;_Tp&gt;&amp;) const;
      ///  Right shift slice elements by corresponding elements of @a v.
      void operator&gt;&gt;=(const valarray&lt;_Tp&gt;&amp;) const;
      ///  Assign all slice elements to @a t.
      void operator= (const _Tp&amp;) const;
      //    ~indirect_array();

      template&lt;class _Dom&gt;
      void operator=(const _Expr&lt;_Dom, _Tp&gt;&amp;) const;
      template&lt;class _Dom&gt;
      void operator*=(const _Expr&lt;_Dom, _Tp&gt;&amp;) const;
      template&lt;class _Dom&gt;
      void operator/=(const _Expr&lt;_Dom, _Tp&gt;&amp;) const;
      template&lt;class _Dom&gt;
      void operator%=(const _Expr&lt;_Dom, _Tp&gt;&amp;) const;
      template&lt;class _Dom&gt;
      void operator+=(const _Expr&lt;_Dom, _Tp&gt;&amp;) const;
      template&lt;class _Dom&gt;
      void operator-=(const _Expr&lt;_Dom, _Tp&gt;&amp;) const;
      template&lt;class _Dom&gt;
      void operator^=(const _Expr&lt;_Dom, _Tp&gt;&amp;) const;
      template&lt;class _Dom&gt;
      void operator&amp;=(const _Expr&lt;_Dom, _Tp&gt;&amp;) const;
      template&lt;class _Dom&gt;
      void operator|=(const _Expr&lt;_Dom, _Tp&gt;&amp;) const;
      template&lt;class _Dom&gt;
      void operator&lt;&lt;=(const _Expr&lt;_Dom, _Tp&gt;&amp;) const;
      template&lt;class _Dom&gt;
      void operator&gt;&gt;=(const _Expr&lt;_Dom, _Tp&gt;&amp;) const;

    private:
      ///  Copy constructor.  Both slices refer to the same underlying array.
      indirect_array(_Array&lt;_Tp&gt;, size_t, _Array&lt;size_t&gt;);

      friend class valarray&lt;_Tp&gt;;
      friend class gslice_array&lt;_Tp&gt;;

      const size_t	 _M_sz;
      const _Array&lt;size_t&gt; _M_index;
      const _Array&lt;_Tp&gt;	 _M_array;

      // not implemented
      indirect_array();
    };

  template&lt;typename _Tp&gt;
    inline
    indirect_array&lt;_Tp&gt;::indirect_array(const indirect_array&lt;_Tp&gt;&amp; __a)
    : _M_sz(__a._M_sz), _M_index(__a._M_index), _M_array(__a._M_array) {}

  template&lt;typename _Tp&gt;
    inline
    indirect_array&lt;_Tp&gt;::indirect_array(_Array&lt;_Tp&gt; __a, size_t __s,
					_Array&lt;size_t&gt; __i)
    : _M_sz(__s), _M_index(__i), _M_array(__a) {}

  template&lt;typename _Tp&gt;
    inline indirect_array&lt;_Tp&gt;&amp;
    indirect_array&lt;_Tp&gt;::operator=(const indirect_array&lt;_Tp&gt;&amp; __a)
    {
      std::__valarray_copy(__a._M_array, _M_sz, __a._M_index, _M_array,
			   _M_index);
      return *this;
    }

  template&lt;typename _Tp&gt;
    inline void
    indirect_array&lt;_Tp&gt;::operator=(const _Tp&amp; __t) const
    { std::__valarray_fill(_M_array, _M_index, _M_sz, __t); }

  template&lt;typename _Tp&gt;
    inline void
    indirect_array&lt;_Tp&gt;::operator=(const valarray&lt;_Tp&gt;&amp; __v) const
    { std::__valarray_copy(_Array&lt;_Tp&gt;(__v), _M_sz, _M_array, _M_index); }

  template&lt;typename _Tp&gt;
    template&lt;class _Dom&gt;
      inline void
      indirect_array&lt;_Tp&gt;::operator=(const _Expr&lt;_Dom, _Tp&gt;&amp; __e) const
      { std::__valarray_copy(__e, _M_sz, _M_array, _M_index); }

#undef _DEFINE_VALARRAY_OPERATOR
#define _DEFINE_VALARRAY_OPERATOR(_Op, _Name)				\
  template&lt;typename _Tp&gt;						\
    inline void								\
    indirect_array&lt;_Tp&gt;::operator _Op##=(const valarray&lt;_Tp&gt;&amp; __v) const\
    {									\
      _Array_augmented_##_Name(_M_array, _M_index, _Array&lt;_Tp&gt;(__v), _M_sz); \
    }									\
									\
  template&lt;typename _Tp&gt;                                                \
    template&lt;class _Dom&gt;				                \
      inline void							\
      indirect_array&lt;_Tp&gt;::operator _Op##=(const _Expr&lt;_Dom,_Tp&gt;&amp; __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(&amp;, __bitwise_and)
_DEFINE_VALARRAY_OPERATOR(|, __bitwise_or)
_DEFINE_VALARRAY_OPERATOR(&lt;&lt;, __shift_left)
_DEFINE_VALARRAY_OPERATOR(&gt;&gt;, __shift_right)

#undef _DEFINE_VALARRAY_OPERATOR

  // @} group numeric_arrays

_GLIBCXX_END_NAMESPACE_VERSION
} // namespace

#endif /* _INDIRECT_ARRAY_H */
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