libstdc++-v3/include/bits/indirect_array.h

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

// Copyright (C) 1997-2001 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 2, 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.

// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING.  If not, write to the Free
// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.

// As a special exception, you may use this file as part of a free software
// library without restriction.  Specifically, if other files instantiate
// templates or use macros or inline functions from this file, or you compile
// this file and link it with other files to produce an executable, this
// file does not by itself cause the resulting executable to be covered by
// the GNU General Public License.  This exception does not however
// invalidate any other reasons why the executable file might be covered by
// the GNU General Public License.

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

/** @file indirect_array.h
 *  This is an internal header file, included by other library headers.
 *  You should not attempt to use it directly.
 */

#ifndef _CPP_BITS_INDIRECT_ARRAY_H
#define _CPP_BITS_INDIRECT_ARRAY_H 1

#pragma GCC system_header

namespace std
{
  template <class _Tp>
     class indirect_array
     {
     public:
       typedef _Tp value_type;

       // XXX: This is a proposed resolution for DR-253.
       indirect_array& operator= (const indirect_array&);

       void operator=  (const valarray<_Tp>&) const;
       void operator*= (const valarray<_Tp>&) const;
       void operator/= (const valarray<_Tp>&) const;
       void operator%= (const valarray<_Tp>&) const; 
       void operator+= (const valarray<_Tp>&) const;
       void operator-= (const valarray<_Tp>&) const;  
       void operator^= (const valarray<_Tp>&) const;
       void operator&= (const valarray<_Tp>&) const;
       void operator|= (const valarray<_Tp>&) const;
       void operator<<= (const valarray<_Tp>&) const;
       void operator>>= (const valarray<_Tp>&) const; 
       void operator= (const _Tp&);
       //    ~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:
       indirect_array (const indirect_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)
     {
       __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)
     { __valarray_fill(_M_array, _M_index, _M_sz, __t); }

  template<typename _Tp>
     inline void
     indirect_array<_Tp>::operator= (const valarray<_Tp>& __v) const
     { __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
     { __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(^, xor)
_DEFINE_VALARRAY_OPERATOR(&, and)
_DEFINE_VALARRAY_OPERATOR(|, or)
_DEFINE_VALARRAY_OPERATOR(<<, shift_left)
_DEFINE_VALARRAY_OPERATOR(>>, shift_right)

#undef _DEFINE_VALARRAY_OPERATOR

} // std::

#endif /* _CPP_BITS_INDIRECT_ARRAY_H */

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