contrib/gcc-3.4/libstdc++-v3/include/bits/gslice_array.h

   1 // The template and inlines for the -*- C++ -*- gslice_array class.
   2
   3 // Copyright (C) 1997, 1998, 1999, 2000, 2001, 2004
   4 // Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 2, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License along
  18 // with this library; see the file COPYING.  If not, write to the Free
  19 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  20 // USA.
  21
  22 // As a special exception, you may use this file as part of a free software
  23 // library without restriction.  Specifically, if other files instantiate
  24 // templates or use macros or inline functions from this file, or you compile
  25 // this file and link it with other files to produce an executable, this
  26 // file does not by itself cause the resulting executable to be covered by
  27 // the GNU General Public License.  This exception does not however
  28 // invalidate any other reasons why the executable file might be covered by
  29 // the GNU General Public License.
  30
  31 // Written by Gabriel Dos Reis <Gabriel.Dos-Reis@DPTMaths.ENS-Cachan.Fr>
  32
  33 /** @file gslice_array.h
  34  *  This is an internal header file, included by other library headers.
  35  *  You should not attempt to use it directly.
  36  */
  37
  38 #ifndef _GSLICE_ARRAY_H
  39 #define _GSLICE_ARRAY_H 1
  40
  41 #pragma GCC system_header
  42
  43 namespace std {
  44
  45   /**
  46    *  @brief  Reference to multi-dimensional subset of an array.
  47    *
  48    *  A gslice_array is a reference to the actual elements of an array
  49    *  specified by a gslice.  The way to get a gslice_array is to call
  50    *  operator[](gslice) on a valarray.  The returned gslice_array then
  51    *  permits carrying operations out on the referenced subset of elements in
  52    *  the original valarray.  For example, operator+=(valarray) will add
  53    *  values to the subset of elements in the underlying valarray this
  54    *  gslice_array refers to.
  55    *
  56    *  @param  Tp  Element type.
  57    */
  58   template<typename _Tp>
  59     class gslice_array
  60     {
  61     public:
  62       typedef _Tp value_type;
  63
  64       // _GLIBCXX_RESOLVE_LIB_DEFECTS
  65       // 253. valarray helper functions are almost entirely useless
  66
  67       ///  Copy constructor.  Both slices refer to the same underlying array.
  68       gslice_array(const gslice_array&);
  69
  70       ///  Assignment operator.  Assigns slice elements to corresponding
  71       ///  elements of @a a.
  72       gslice_array& operator=(const gslice_array&);
  73
  74       ///  Assign slice elements to corresponding elements of @a v.
  75       void operator=(const valarray<_Tp>&) const;
  76       ///  Multiply slice elements by corresponding elements of @a v.
  77       void operator*=(const valarray<_Tp>&) const;
  78       ///  Divide slice elements by corresponding elements of @a v.
  79       void operator/=(const valarray<_Tp>&) const;
  80       ///  Modulo slice elements by corresponding elements of @a v.
  81       void operator%=(const valarray<_Tp>&) const;
  82       ///  Add corresponding elements of @a v to slice elements.
  83       void operator+=(const valarray<_Tp>&) const;
  84       ///  Subtract corresponding elements of @a v from slice elements.
  85       void operator-=(const valarray<_Tp>&) const;
  86       ///  Logical xor slice elements with corresponding elements of @a v.
  87       void operator^=(const valarray<_Tp>&) const;
  88       ///  Logical and slice elements with corresponding elements of @a v.
  89       void operator&=(const valarray<_Tp>&) const;
  90       ///  Logical or slice elements with corresponding elements of @a v.
  91       void operator|=(const valarray<_Tp>&) const;
  92       ///  Left shift slice elements by corresponding elements of @a v.
  93       void operator<<=(const valarray<_Tp>&) const;
  94       ///  Right shift slice elements by corresponding elements of @a v.
  95       void operator>>=(const valarray<_Tp>&) const;
  96       ///  Assign all slice elements to @a t.
  97       void operator=(const _Tp&) const;
  98
  99       template<class _Dom>
 100         void operator=(const _Expr<_Dom,_Tp>&) const;
 101       template<class _Dom>
 102         void operator*=(const _Expr<_Dom,_Tp>&) const;
 103       template<class _Dom>
 104         void operator/=(const _Expr<_Dom,_Tp>&) const;
 105       template<class _Dom>
 106         void operator%=(const _Expr<_Dom,_Tp>&) const;
 107       template<class _Dom>
 108         void operator+=(const _Expr<_Dom,_Tp>&) const;
 109       template<class _Dom>
 110         void operator-=(const _Expr<_Dom,_Tp>&) const;
 111       template<class _Dom>
 112         void operator^=(const _Expr<_Dom,_Tp>&) const;
 113       template<class _Dom>
 114         void operator&=(const _Expr<_Dom,_Tp>&) const;
 115       template<class _Dom>
 116         void operator|=(const _Expr<_Dom,_Tp>&) const;
 117       template<class _Dom>
 118         void operator<<=(const _Expr<_Dom,_Tp>&) const;
 119       template<class _Dom>
 120         void operator>>=(const _Expr<_Dom,_Tp>&) const;
 121
 122     private:
 123       _Array<_Tp>    _M_array;
 124       const valarray<size_t>& _M_index;
 125
 126       friend class valarray<_Tp>;
 127
 128       gslice_array(_Array<_Tp>, const valarray<size_t>&);
 129
 130       // not implemented
 131       gslice_array();
 132     };
 133
 134   template<typename _Tp>
 135     inline
 136     gslice_array<_Tp>::gslice_array(_Array<_Tp> __a,
 137                                     const valarray<size_t>& __i)
 138     : _M_array(__a), _M_index(__i) {}
 139
 140
 141   template<typename _Tp>
 142     inline
 143     gslice_array<_Tp>::gslice_array(const gslice_array<_Tp>& __a)
 144     : _M_array(__a._M_array), _M_index(__a._M_index) {}
 145
 146
 147   template<typename _Tp>
 148     inline gslice_array<_Tp>&
 149     gslice_array<_Tp>::operator=(const gslice_array<_Tp>& __a)
 150     {
 151       std::__valarray_copy(_Array<_Tp>(__a._M_array),
 152                            _Array<size_t>(__a._M_index), _M_index.size(),
 153                            _M_array, _Array<size_t>(_M_index));
 154       return *this;
 155     }
 156
 157   template<typename _Tp>
 158     inline void
 159     gslice_array<_Tp>::operator=(const _Tp& __t) const
 160     {
 161       std::__valarray_fill(_M_array, _Array<size_t>(_M_index),
 162                            _M_index.size(), __t);
 163     }
 164
 165   template<typename _Tp>
 166     inline void
 167     gslice_array<_Tp>::operator=(const valarray<_Tp>& __v) const
 168     {
 169       std::__valarray_copy(_Array<_Tp>(__v), __v.size(),
 170                            _M_array, _Array<size_t>(_M_index));
 171     }
 172
 173   template<typename _Tp>
 174     template<class _Dom>
 175       inline void
 176       gslice_array<_Tp>::operator=(const _Expr<_Dom, _Tp>& __e) const
 177       {
 178         std::__valarray_copy (__e, _M_index.size(), _M_array,
 179                               _Array<size_t>(_M_index));
 180       }
 181
 182 #undef _DEFINE_VALARRAY_OPERATOR
 183 #define _DEFINE_VALARRAY_OPERATOR(_Op, _Name)                           \
 184   template<typename _Tp>                                                \
 185     inline void                                                         \
 186     gslice_array<_Tp>::operator _Op##=(const valarray<_Tp>& __v) const  \
 187     {                                                                   \
 188       _Array_augmented_##_Name(_M_array, _Array<size_t>(_M_index),      \
 189                               _Array<_Tp>(__v), __v.size());            \
 190     }                                                                   \
 191                                                                         \
 192   template<typename _Tp>                                                \
 193     template<class _Dom>                                                \
 194       inline void                                                       \
 195       gslice_array<_Tp>::operator _Op##= (const _Expr<_Dom, _Tp>& __e) const\
 196       {                                                                 \
 197         _Array_augmented_##_Name(_M_array, _Array<size_t>(_M_index), __e,\
 198                                  _M_index.size());                      \
 199       }
 200
 201 _DEFINE_VALARRAY_OPERATOR(*, __multiplies)
 202 _DEFINE_VALARRAY_OPERATOR(/, __divides)
 203 _DEFINE_VALARRAY_OPERATOR(%, __modulus)
 204 _DEFINE_VALARRAY_OPERATOR(+, __plus)
 205 _DEFINE_VALARRAY_OPERATOR(-, __minus)
 206 _DEFINE_VALARRAY_OPERATOR(^, __bitwise_xor)
 207 _DEFINE_VALARRAY_OPERATOR(&, __bitwise_and)
 208 _DEFINE_VALARRAY_OPERATOR(|, __bitwise_or)
 209 _DEFINE_VALARRAY_OPERATOR(<<, __shift_left)
 210 _DEFINE_VALARRAY_OPERATOR(>>, __shift_right)
 211
 212 #undef _DEFINE_VALARRAY_OPERATOR
 213
 214 } // std::
 215
 216 #endif /* _GSLICE_ARRAY_H */
 217
 218 // Local Variables:
 219 // mode:c++
 220 // End: